Bootstrap可多选、搜索的下拉列表

冷不防 2022-08-09 18:48 506阅读 0赞

## 示例图： ##

**可搜索**  
![可搜索][20151104115410821]

**区分大小写搜索**

![区分大小写搜索][20151104115429802]

需要引用bootstrap文件，核心文件：bootstrap-multiselect.css、bootstrap-multiselect.js

## bootstrap-multiselect.css ##

.multiselect-container{ position:absolute;list-style-type:none;margin:0;padding:0}.multiselect-container .input-group{ margin:5px}.multiselect-container>li{ padding:0}.multiselect-container>li>a.multiselect-all label{ font-weight:bold}.multiselect-container>li>label.multiselect-group{ margin:0;padding:3px 20px 3px 20px;height:100%;font-weight:bold}.multiselect-container>li>a>label{ margin:0;height:100%;cursor:pointer;font-weight:normal}.multiselect-container>li>a>label.radio,.multiselect-container>li>a>label.checkbox{ margin:0}.multiselect-container>li>a>label>input[type="checkbox"]{ margin-bottom:5px}.btn-group>.btn-group:nth-child(2)>.multiselect.btn{ border-top-left-radius:4px;border-bottom-left-radius:4px}

## bootstrap-multiselect.js ##

/** * Bootstrap Multiselect (https://github.com/davidstutz/bootstrap-multiselect) * * Apache License, Version 2.0: * Copyright (c) 2012 - 2015 David Stutz * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a * copy of the License at http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * * BSD 3-Clause License: * Copyright (c) 2012 - 2015 David Stutz * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - Neither the name of David Stutz nor the names of its contributors may be * used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 为什么使用这个js：全选后可以反选 */
    !function ($) {
        "use strict";// jshint ;_;
    
        if (typeof ko !== 'undefined' && ko.bindingHandlers && !ko.bindingHandlers.multiselect) {
            ko.bindingHandlers.multiselect = {
                after: ['options', 'value', 'selectedOptions'],
    
                init: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
                    var $element = $(element);
                    var config = ko.toJS(valueAccessor());
    
                    $element.multiselect(config);
    
                    if (allBindings.has('options')) {
                        var options = allBindings.get('options');
                        if (ko.isObservable(options)) {
                            ko.computed({
                                read: function () {
                                    options();
                                    setTimeout(function () {
                                        var ms = $element.data('multiselect');
                                        if (ms)
                                            ms.updateOriginalOptions();//Not sure how beneficial this is.
                                        $element.multiselect('rebuild');
                                    }, 1);
                                },
                                disposeWhenNodeIsRemoved: element
                            });
                        }
                    }
    
                    //value and selectedOptions are two-way, so these will be triggered even by our own actions.
                    //It needs some way to tell if they are triggered because of us or because of outside change.
                    //It doesn't loop but it's a waste of processing.
                    if (allBindings.has('value')) {
                        var value = allBindings.get('value');
                        if (ko.isObservable(value)) {
                            ko.computed({
                                read: function () {
                                    value();
                                    setTimeout(function () {
                                        $element.multiselect('refresh');
                                    }, 1);
                                },
                                disposeWhenNodeIsRemoved: element
                            }).extend({ rateLimit: 100, notifyWhenChangesStop: true });
                        }
                    }
    
                    //Switched from arrayChange subscription to general subscription using 'refresh'.
                    //Not sure performance is any better using 'select' and 'deselect'.
                    if (allBindings.has('selectedOptions')) {
                        var selectedOptions = allBindings.get('selectedOptions');
                        if (ko.isObservable(selectedOptions)) {
                            ko.computed({
                                read: function () {
                                    selectedOptions();
                                    setTimeout(function () {
                                        $element.multiselect('refresh');
                                    }, 1);
                                },
                                disposeWhenNodeIsRemoved: element
                            }).extend({ rateLimit: 100, notifyWhenChangesStop: true });
                        }
                    }
    
                    ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
                        $element.multiselect('destroy');
                    });
                },
    
                update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
                    var $element = $(element);
                    var config = ko.toJS(valueAccessor());
    
                    $element.multiselect('setOptions', config);
                    $element.multiselect('rebuild');
                }
            };
        }
    
        function forEach(array, callback) {
            for (var index = 0; index < array.length; ++index) {
                callback(array[index], index);
            }
        }
    
        /** * Constructor to create a new multiselect using the given select. * * @param {jQuery} select * @param {Object} options * @returns {Multiselect} */
        function Multiselect(select, options) {
    
            this.$select = $(select);
            this.options = this.mergeOptions($.extend({}, options, this.$select.data()));
    
            // Initialization.
            // We have to clone to create a new reference.
            this.originalOptions = this.$select.clone()[0].options;
            this.query = '';
            this.searchTimeout = null;
            this.lastToggledInput = null
    
            this.options.multiple = this.$select.attr('multiple') === "multiple";
            this.options.onChange = $.proxy(this.options.onChange, this);
            this.options.onDropdownShow = $.proxy(this.options.onDropdownShow, this);
            this.options.onDropdownHide = $.proxy(this.options.onDropdownHide, this);
            this.options.onDropdownShown = $.proxy(this.options.onDropdownShown, this);
            this.options.onDropdownHidden = $.proxy(this.options.onDropdownHidden, this);
    
            // Build select all if enabled.
            this.buildContainer();
            this.buildButton();
            this.buildDropdown();
            this.buildSelectAll();
            this.buildDropdownOptions();
            this.buildFilter();
    
            this.updateButtonText();
            this.updateSelectAll();
    
            if (this.options.disableIfEmpty && $('option', this.$select).length <= 0) {
                this.disable();
            }
    
            this.$select.hide().after(this.$container);
        };
    
        Multiselect.prototype = {
    
            defaults: {
                /** * Default text function will either print 'None selected' in case no * option is selected or a list of the selected options up to a length * of 3 selected options. * * @param {jQuery} options * @param {jQuery} select * @returns {String} */
                buttonText: function (options, select) {
                    if (options.length === 0) {
                        return this.nonSelectedText;
                    }
                    else if (this.allSelectedText && options.length == $('option', $(select)).length) {
                        if (this.selectAllNumber) {
                            return this.allSelectedText + ' (' + options.length + ')';
                        }
                        else {
                            return this.allSelectedText;
                        }
                    }
                    else if (options.length > this.numberDisplayed) {
                        return options.length + ' ' + this.nSelectedText;
                    }
                    else {
                        var selected = '';
                        options.each(function () {
                            var label = ($(this).attr('label') !== undefined) ? $(this).attr('label') : $(this).text();
    
                            selected += label + ', ';
                        });
    
                        return selected.substr(0, selected.length - 2);
                    }
                },
                /** * Updates the title of the button similar to the buttonText function. * * @param {jQuery} options * @param {jQuery} select * @returns { @exp;selected@call;substr} */
                buttonTitle: function (options, select) {
                    if (options.length === 0) {
                        return this.nonSelectedText;
                    }
                    else {
                        var selected = '';
                        options.each(function () {
                            selected += $(this).text() + ', ';
                        });
                        return selected.substr(0, selected.length - 2);
                    }
                },
                /** * Create a label. * * @param {jQuery} element * @returns {String} */
                optionLabel: function (element) {
                    return $(element).attr('label') || $(element).text();
                },
                /** * Triggered on change of the multiselect. * * Not triggered when selecting/deselecting options manually. * * @param {jQuery} option * @param {Boolean} checked */
                onChange: function (option, checked) {
    
                },
                /** * Triggered when the dropdown is shown. * * @param {jQuery} event */
                onDropdownShow: function (event) {
    
                },
                /** * Triggered when the dropdown is hidden. * * @param {jQuery} event */
                onDropdownHide: function (event) {
    
                },
                /** * Triggered after the dropdown is shown. * * @param {jQuery} event */
                onDropdownShown: function (event) {
    
                },
                /** * Triggered after the dropdown is hidden. * * @param {jQuery} event */
                onDropdownHidden: function (event) {
    
                },
                /** * Triggered on select all. */
                onSelectAll: function () {
    
                },
                enableHTML: false,
                //buttonClass: 'btn btn-default',
                buttonClass: 'btn',
                inheritClass: false,
                buttonWidth: 'auto',
                buttonContainer: '<div class="btn-group" style="width:100%" />',
                dropRight: false,
                selectedClass: 'active',
                // Maximum height of the dropdown menu.
                // If maximum height is exceeded a scrollbar will be displayed.
                maxHeight: false,
                checkboxName: false,
                includeSelectAllOption: false,
                includeSelectAllIfMoreThan: 0,
                selectAllText: ' 全选',
                selectAllValue: 'multiselect-all',
                selectAllName: false,
                selectAllNumber: true,
                enableFiltering: false,
                enableCaseInsensitiveFiltering: false,
                enableClickableOptGroups: false,
                filterPlaceholder: 'Search',
                // possible options: 'text', 'value', 'both'
                filterBehavior: 'text',
                includeFilterClearBtn: true,
                preventInputChangeEvent: false,
                nonSelectedText: '请选择',
                nSelectedText: 'selected',
                allSelectedText: 'All selected',
                numberDisplayed: 3,
                disableIfEmpty: false,
                templates: {
                    button: '<button type="button" class="multiselect dropdown-toggle form-control" data-toggle="dropdown"><span class="multiselect-selected-text"></span> <b class="caret"></b></button>',
                    ul: '<ul class="multiselect-container dropdown-menu"></ul>',
                    filter: '<li class="multiselect-item filter"><div class="input-group"><span class="input-group-addon"><i class="fa fa-search"></i></span><input class="form-control multiselect-search" type="text"></div></li>',
                    filterClearBtn: '<span class="input-group-btn"><button class="btn btn-default multiselect-clear-filter" type="button"><i class="fa fa-times-circle" ></i></button></span>',
                    li: '<li><a tabindex="0"><label></label></a></li>',
                    divider: '<li class="multiselect-item divider"></li>',
                    liGroup: '<li class="multiselect-item multiselect-group"><label></label></li>'
                }
            },
    
            constructor: Multiselect,
    
            /** * Builds the container of the multiselect. */
            buildContainer: function () {
                this.$container = $(this.options.buttonContainer);
                this.$container.on('show.bs.dropdown', this.options.onDropdownShow);
                this.$container.on('hide.bs.dropdown', this.options.onDropdownHide);
                this.$container.on('shown.bs.dropdown', this.options.onDropdownShown);
                this.$container.on('hidden.bs.dropdown', this.options.onDropdownHidden);
            },
    
            /** * Builds the button of the multiselect. */
            buildButton: function () {
                this.$button = $(this.options.templates.button).addClass(this.options.buttonClass);
                if (this.$select.attr('class') && this.options.inheritClass) {
                    this.$button.addClass(this.$select.attr('class'));
                }
                // Adopt active state.
                if (this.$select.prop('disabled')) {
                    this.disable();
                }
                else {
                    this.enable();
                }
    
                // Manually add button width if set.
                if (this.options.buttonWidth && this.options.buttonWidth !== 'auto') {
                    this.$button.css({
                        'width': this.options.buttonWidth,
                        'overflow': 'hidden',
                        'text-overflow': 'ellipsis'
                    });
                    this.$container.css({
                        'width': this.options.buttonWidth
                    });
                }
    
                // Keep the tab index from the select.
                var tabindex = this.$select.attr('tabindex');
                if (tabindex) {
                    this.$button.attr('tabindex', tabindex);
                }
    
                this.$container.prepend(this.$button);
            },
    
            /** * Builds the ul representing the dropdown menu. */
            buildDropdown: function () {
    
                // Build ul.
                this.$ul = $(this.options.templates.ul);
    
                if (this.options.dropRight) {
                    this.$ul.addClass('pull-right');
                }
    
                // Set max height of dropdown menu to activate auto scrollbar.
                if (this.options.maxHeight) {
                    // TODO: Add a class for this option to move the css declarations.
                    this.$ul.css({
                        'max-height': this.options.maxHeight + 'px',
                        'overflow-y': 'auto',
                        'overflow-x': 'hidden'
                    });
                }
    
                this.$container.append(this.$ul);
            },
    
            /** * Build the dropdown options and binds all nessecary events. * * Uses createDivider and createOptionValue to create the necessary options. */
            buildDropdownOptions: function () {
    
                this.$select.children().each($.proxy(function (index, element) {
    
                    var $element = $(element);
                    // Support optgroups and options without a group simultaneously.
                    var tag = $element.prop('tagName')
                        .toLowerCase();
    
                    if ($element.prop('value') === this.options.selectAllValue) {
                        return;
                    }
    
                    if (tag === 'optgroup') {
                        this.createOptgroup(element);
                    }
                    else if (tag === 'option') {
    
                        if ($element.data('role') === 'divider') {
                            this.createDivider();
                        }
                        else {
                            this.createOptionValue(element);
                        }
    
                    }
    
                    // Other illegal tags will be ignored.
                }, this));
    
                // Bind the change event on the dropdown elements.
                $('li input', this.$ul).on('change', $.proxy(function (event) {
                    var $target = $(event.target);
    
                    var checked = $target.prop('checked') || false;
                    var isSelectAllOption = $target.val() === this.options.selectAllValue;
    
                    // Apply or unapply the configured selected class.
                    if (this.options.selectedClass) {
                        if (checked) {
                            $target.closest('li')
                                .addClass(this.options.selectedClass);
                        }
                        else {
                            $target.closest('li')
                                .removeClass(this.options.selectedClass);
                        }
                    }
    
                    // Get the corresponding option.
                    var value = $target.val();
                    var $option = this.getOptionByValue(value);
    
                    var $optionsNotThis = $('option', this.$select).not($option);
                    var $checkboxesNotThis = $('input', this.$container).not($target);
    
                    if (isSelectAllOption) {
                        if (checked) {
                            this.selectAll();
                        }
                        else {
                            this.deselectAll();
                        }
                    }
    
                    if (!isSelectAllOption) {
                        if (checked) {
                            $option.prop('selected', true);
    
                            if (this.options.multiple) {
                                // Simply select additional option.
                                $option.prop('selected', true);
                            }
                            else {
                                // Unselect all other options and corresponding checkboxes.
                                if (this.options.selectedClass) {
                                    $($checkboxesNotThis).closest('li').removeClass(this.options.selectedClass);
                                }
    
                                $($checkboxesNotThis).prop('checked', false);
                                $optionsNotThis.prop('selected', false);
    
                                // It's a single selection, so close.
                                this.$button.click();
                            }
    
                            if (this.options.selectedClass === "active") {
                                $optionsNotThis.closest("a").css("outline", "");
                            }
                        }
                        else {
                            // Unselect option.
                            $option.prop('selected', false);
                        }
                    }
    
                    this.$select.change();
    
                    this.updateButtonText();
                    this.updateSelectAll();
    
                    this.options.onChange($option, checked);
    
                    if (this.options.preventInputChangeEvent) {
                        return false;
                    }
                }, this));
    
                $('li a', this.$ul).on('mousedown', function (e) {
                    if (e.shiftKey) {
                        // Prevent selecting text by Shift+click
                        return false;
                    }
                });
    
                $('li a', this.$ul).on('touchstart click', $.proxy(function (event) {
                    event.stopPropagation();
    
                    var $target = $(event.target);
    
                    if (event.shiftKey && this.options.multiple) {
                        if ($target.is("label")) { // Handles checkbox selection manually (see https://github.com/davidstutz/bootstrap-multiselect/issues/431)
                            event.preventDefault();
                            $target = $target.find("input");
                            $target.prop("checked", !$target.prop("checked"));
                        }
                        var checked = $target.prop('checked') || false;
    
                        if (this.lastToggledInput !== null && this.lastToggledInput !== $target) { // Make sure we actually have a range
                            var from = $target.closest("li").index();
                            var to = this.lastToggledInput.closest("li").index();
    
                            if (from > to) { // Swap the indices
                                var tmp = to;
                                to = from;
                                from = tmp;
                            }
    
                            // Make sure we grab all elements since slice excludes the last index
                            ++to;
    
                            // Change the checkboxes and underlying options
                            var range = this.$ul.find("li").slice(from, to).find("input");
    
                            range.prop('checked', checked);
    
                            if (this.options.selectedClass) {
                                range.closest('li')
                                    .toggleClass(this.options.selectedClass, checked);
                            }
    
                            for (var i = 0, j = range.length; i < j; i++) {
                                var $checkbox = $(range[i]);
    
                                var $option = this.getOptionByValue($checkbox.val());
    
                                $option.prop('selected', checked);
                            }
                        }
    
                        // Trigger the select "change" event
                        $target.trigger("change");
                    }
    
                    // Remembers last clicked option
                    if ($target.is("input") && !$target.closest("li").is(".multiselect-item")) {
                        this.lastToggledInput = $target;
                    }
    
                    $target.blur();
                }, this));
    
                // Keyboard support.
                this.$container.off('keydown.multiselect').on('keydown.multiselect', $.proxy(function (event) {
                    if ($('input[type="text"]', this.$container).is(':focus')) {
                        return;
                    }
    
                    if (event.keyCode === 9 && this.$container.hasClass('open')) {
                        this.$button.click();
                    }
                    else {
                        var $items = $(this.$container).find("li:not(.divider):not(.disabled) a").filter(":visible");
    
                        if (!$items.length) {
                            return;
                        }
    
                        var index = $items.index($items.filter(':focus'));
    
                        // Navigation up.
                        if (event.keyCode === 38 && index > 0) {
                            index--;
                        }
                            // Navigate down.
                        else if (event.keyCode === 40 && index < $items.length - 1) {
                            index++;
                        }
                        else if (!~index) {
                            index = 0;
                        }
    
                        var $current = $items.eq(index);
                        $current.focus();
    
                        if (event.keyCode === 32 || event.keyCode === 13) {
                            var $checkbox = $current.find('input');
    
                            $checkbox.prop("checked", !$checkbox.prop("checked"));
                            $checkbox.change();
                        }
    
                        event.stopPropagation();
                        event.preventDefault();
                    }
                }, this));
    
                if (this.options.enableClickableOptGroups && this.options.multiple) {
                    $('li.multiselect-group', this.$ul).on('click', $.proxy(function (event) {
                        event.stopPropagation();
    
                        var group = $(event.target).parent();
    
                        // Search all option in optgroup
                        var $options = group.nextUntil('li.multiselect-group');
                        var $visibleOptions = $options.filter(":visible:not(.disabled)");
    
                        // check or uncheck items
                        var allChecked = true;
                        var optionInputs = $visibleOptions.find('input');
                        optionInputs.each(function () {
                            allChecked = allChecked && $(this).prop('checked');
                        });
    
                        optionInputs.prop('checked', !allChecked).trigger('change');
                    }, this));
                }
            },
    
            /** * Create an option using the given select option. * * @param {jQuery} element */
            createOptionValue: function (element) {
                var $element = $(element);
                if ($element.is(':selected')) {
                    $element.prop('selected', true);
                }
    
                // Support the label attribute on options.
                var label = this.options.optionLabel(element);
                var value = $element.val();
                var inputType = this.options.multiple ? "checkbox" : "radio";
    
                var $li = $(this.options.templates.li);
                var $label = $('label', $li);
                $label.addClass(inputType);
    
                if (this.options.enableHTML) {
                    $label.html(" " + label);
                }
                else {
                    $label.text(" " + label);
                }
    
                var $checkbox = $('<input/>').attr('type', inputType);
    
                if (this.options.checkboxName) {
                    $checkbox.attr('name', this.options.checkboxName);
                }
                $label.prepend($checkbox);
    
                var selected = $element.prop('selected') || false;
                $checkbox.val(value);
    
                if (value === this.options.selectAllValue) {
                    $li.addClass("multiselect-item multiselect-all");
                    $checkbox.parent().parent()
                        .addClass('multiselect-all');
                }
    
                $label.attr('title', $element.attr('title'));
    
                this.$ul.append($li);
    
                if ($element.is(':disabled')) {
                    $checkbox.attr('disabled', 'disabled')
                        .prop('disabled', true)
                        .closest('a')
                        .attr("tabindex", "-1")
                        .closest('li')
                        .addClass('disabled');
                }
    
                $checkbox.prop('checked', selected);
    
                if (selected && this.options.selectedClass) {
                    $checkbox.closest('li')
                        .addClass(this.options.selectedClass);
                }
            },
    
            /** * Creates a divider using the given select option. * * @param {jQuery} element */
            createDivider: function (element) {
                var $divider = $(this.options.templates.divider);
                this.$ul.append($divider);
            },
    
            /** * Creates an optgroup. * * @param {jQuery} group */
            createOptgroup: function (group) {
                var groupName = $(group).prop('label');
    
                // Add a header for the group.
                var $li = $(this.options.templates.liGroup);
    
                if (this.options.enableHTML) {
                    $('label', $li).html(groupName);
                }
                else {
                    $('label', $li).text(groupName);
                }
    
                if (this.options.enableClickableOptGroups) {
                    $li.addClass('multiselect-group-clickable');
                }
    
                this.$ul.append($li);
    
                if ($(group).is(':disabled')) {
                    $li.addClass('disabled');
                }
    
                // Add the options of the group.
                $('option', group).each($.proxy(function (index, element) {
                    this.createOptionValue(element);
                }, this));
            },
    
            /** * Build the selct all. * * Checks if a select all has already been created. */
            buildSelectAll: function () {
                if (typeof this.options.selectAllValue === 'number') {
                    this.options.selectAllValue = this.options.selectAllValue.toString();
                }
    
                var alreadyHasSelectAll = this.hasSelectAll();
    
                if (!alreadyHasSelectAll && this.options.includeSelectAllOption && this.options.multiple
                        && $('option', this.$select).length > this.options.includeSelectAllIfMoreThan) {
    
                    // Check whether to add a divider after the select all.
                    if (this.options.includeSelectAllDivider) {
                        this.$ul.prepend($(this.options.templates.divider));
                    }
    
                    var $li = $(this.options.templates.li);
                    $('label', $li).addClass("checkbox");
    
                    if (this.options.enableHTML) {
                        $('label', $li).html(" " + this.options.selectAllText);
                    }
                    else {
                        $('label', $li).text(" " + this.options.selectAllText);
                    }
    
                    if (this.options.selectAllName) {
                        $('label', $li).prepend('<input type="checkbox" name="' + this.options.selectAllName + '" />');
                    }
                    else {
                        $('label', $li).prepend('<input type="checkbox" />');
                    }
    
                    var $checkbox = $('input', $li);
                    $checkbox.val(this.options.selectAllValue);
    
                    $li.addClass("multiselect-item multiselect-all");
                    $checkbox.parent().parent()
                        .addClass('multiselect-all');
    
                    this.$ul.prepend($li);
    
                    $checkbox.prop('checked', false);
                }
            },
    
            /** * Builds the filter. */
            buildFilter: function () {
    
                // Build filter if filtering OR case insensitive filtering is enabled and the number of options exceeds (or equals) enableFilterLength.
                if (this.options.enableFiltering || this.options.enableCaseInsensitiveFiltering) {
                    var enableFilterLength = Math.max(this.options.enableFiltering, this.options.enableCaseInsensitiveFiltering);
    
                    if (this.$select.find('option').length >= enableFilterLength) {
    
                        this.$filter = $(this.options.templates.filter);
                        $('input', this.$filter).attr('placeholder', this.options.filterPlaceholder);
    
                        // Adds optional filter clear button
                        if (this.options.includeFilterClearBtn) {
                            var clearBtn = $(this.options.templates.filterClearBtn);
                            clearBtn.on('click', $.proxy(function (event) {
                                clearTimeout(this.searchTimeout);
                                this.$filter.find('.multiselect-search').val('');
                                $('li', this.$ul).show().removeClass("filter-hidden");
                                this.updateSelectAll();
                            }, this));
                            this.$filter.find('.input-group').append(clearBtn);
                        }
    
                        this.$ul.prepend(this.$filter);
    
                        this.$filter.val(this.query).on('click', function (event) {
                            event.stopPropagation();
                        }).on('input keydown', $.proxy(function (event) {
                            // Cancel enter key default behaviour
                            if (event.which === 13) {
                                event.preventDefault();
                            }
    
                            // This is useful to catch "keydown" events after the browser has updated the control.
                            clearTimeout(this.searchTimeout);
    
                            this.searchTimeout = this.asyncFunction($.proxy(function () {
    
                                if (this.query !== event.target.value) {
                                    this.query = event.target.value;
    
                                    var currentGroup, currentGroupVisible;
                                    $.each($('li', this.$ul), $.proxy(function (index, element) {
                                        var value = $('input', element).length > 0 ? $('input', element).val() : "";
                                        var text = $('label', element).text();
    
                                        var filterCandidate = '';
                                        if ((this.options.filterBehavior === 'text')) {
                                            filterCandidate = text;
                                        }
                                        else if ((this.options.filterBehavior === 'value')) {
                                            filterCandidate = value;
                                        }
                                        else if (this.options.filterBehavior === 'both') {
                                            filterCandidate = text + '\n' + value;
                                        }
    
                                        if (value !== this.options.selectAllValue && text) {
                                            // By default lets assume that element is not
                                            // interesting for this search.
                                            var showElement = false;
    
                                            if (this.options.enableCaseInsensitiveFiltering && filterCandidate.toLowerCase().indexOf(this.query.toLowerCase()) > -1) {
                                                showElement = true;
                                            }
                                            else if (filterCandidate.indexOf(this.query) > -1) {
                                                showElement = true;
                                            }
    
                                            // Toggle current element (group or group item) according to showElement boolean.
                                            $(element).toggle(showElement).toggleClass('filter-hidden', !showElement);
    
                                            // Differentiate groups and group items.
                                            if ($(element).hasClass('multiselect-group')) {
                                                // Remember group status.
                                                currentGroup = element;
                                                currentGroupVisible = showElement;
                                            }
                                            else {
                                                // Show group name when at least one of its items is visible.
                                                if (showElement) {
                                                    $(currentGroup).show().removeClass('filter-hidden');
                                                }
    
                                                // Show all group items when group name satisfies filter.
                                                if (!showElement && currentGroupVisible) {
                                                    $(element).show().removeClass('filter-hidden');
                                                }
                                            }
                                        }
                                    }, this));
                                }
    
                                this.updateSelectAll();
                            }, this), 300, this);
                        }, this));
                    }
                }
            },
    
            /** * Unbinds the whole plugin. */
            destroy: function () {
                this.$container.remove();
                this.$select.show();
                this.$select.data('multiselect', null);
            },
    
            /** * Refreshs the multiselect based on the selected options of the select. */
            refresh: function () {
                $('option', this.$select).each($.proxy(function (index, element) {
                    var $input = $('li input', this.$ul).filter(function () {
                        return $(this).val() === $(element).val();
                    });
    
                    if ($(element).is(':selected')) {
                        $input.prop('checked', true);
    
                        if (this.options.selectedClass) {
                            $input.closest('li')
                                .addClass(this.options.selectedClass);
                        }
                    }
                    else {
                        $input.prop('checked', false);
    
                        if (this.options.selectedClass) {
                            $input.closest('li')
                                .removeClass(this.options.selectedClass);
                        }
                    }
    
                    if ($(element).is(":disabled")) {
                        $input.attr('disabled', 'disabled')
                            .prop('disabled', true)
                            .closest('li')
                            .addClass('disabled');
                    }
                    else {
                        $input.prop('disabled', false)
                            .closest('li')
                            .removeClass('disabled');
                    }
                }, this));
    
                this.updateButtonText();
                this.updateSelectAll();
            },
    
            /** * Select all options of the given values. * * If triggerOnChange is set to true, the on change event is triggered if * and only if one value is passed. * * @param {Array} selectValues * @param {Boolean} triggerOnChange */
            select: function (selectValues, triggerOnChange) {
                if (!$.isArray(selectValues)) {
                    selectValues = [selectValues];
                }
    
                for (var i = 0; i < selectValues.length; i++) {
                    var value = selectValues[i];
    
                    if (value === null || value === undefined) {
                        continue;
                    }
    
                    var $option = this.getOptionByValue(value);
                    var $checkbox = this.getInputByValue(value);
    
                    if ($option === undefined || $checkbox === undefined) {
                        continue;
                    }
    
                    if (!this.options.multiple) {
                        this.deselectAll(false);
                    }
    
                    if (this.options.selectedClass) {
                        $checkbox.closest('li')
                            .addClass(this.options.selectedClass);
                    }
    
                    $checkbox.prop('checked', true);
                    $option.prop('selected', true);
                }
    
                this.updateButtonText();
                this.updateSelectAll();
    
                if (triggerOnChange && selectValues.length === 1) {
                    this.options.onChange($option, true);
                }
            },
    
            /** * Clears all selected items. */
            clearSelection: function () {
                this.deselectAll(false);
                this.updateButtonText();
                this.updateSelectAll();
            },
    
            /** * Deselects all options of the given values. * * If triggerOnChange is set to true, the on change event is triggered, if * and only if one value is passed. * * @param {Array} deselectValues * @param {Boolean} triggerOnChange */
            deselect: function (deselectValues, triggerOnChange) {
                if (!$.isArray(deselectValues)) {
                    deselectValues = [deselectValues];
                }
    
                for (var i = 0; i < deselectValues.length; i++) {
                    var value = deselectValues[i];
    
                    if (value === null || value === undefined) {
                        continue;
                    }
    
                    var $option = this.getOptionByValue(value);
                    var $checkbox = this.getInputByValue(value);
    
                    if ($option === undefined || $checkbox === undefined) {
                        continue;
                    }
    
                    if (this.options.selectedClass) {
                        $checkbox.closest('li')
                            .removeClass(this.options.selectedClass);
                    }
    
                    $checkbox.prop('checked', false);
                    $option.prop('selected', false);
                }
    
                this.updateButtonText();
                this.updateSelectAll();
    
                if (triggerOnChange && deselectValues.length === 1) {
                    this.options.onChange($option, false);
                }
            },
    
            /** * Selects all enabled & visible options. * * If justVisible is true or not specified, only visible options are selected. * * @param {Boolean} justVisible * @param {Boolean} triggerOnSelectAll */
            selectAll: function (justVisible, triggerOnSelectAll) {
                var justVisible = typeof justVisible === 'undefined' ? true : justVisible;
                var allCheckboxes = $("li input[type='checkbox']:enabled", this.$ul);
                var visibleCheckboxes = allCheckboxes.filter(":visible");
                var allCheckboxesCount = allCheckboxes.length;
                var visibleCheckboxesCount = visibleCheckboxes.length;
    
                if (justVisible) {
                    visibleCheckboxes.prop('checked', true);
                    $("li:not(.divider):not(.disabled)", this.$ul).filter(":visible").addClass(this.options.selectedClass);
                }
                else {
                    allCheckboxes.prop('checked', true);
                    $("li:not(.divider):not(.disabled)", this.$ul).addClass(this.options.selectedClass);
                }
    
                if (allCheckboxesCount === visibleCheckboxesCount || justVisible === false) {
                    $("option:enabled", this.$select).prop('selected', true);
                }
                else {
                    var values = visibleCheckboxes.map(function () {
                        return $(this).val();
                    }).get();
    
                    $("option:enabled", this.$select).filter(function (index) {
                        return $.inArray($(this).val(), values) !== -1;
                    }).prop('selected', true);
                }
    
                if (triggerOnSelectAll) {
                    this.options.onSelectAll();
                }
            },
    
            /** * Deselects all options. * * If justVisible is true or not specified, only visible options are deselected. * * @param {Boolean} justVisible */
            deselectAll: function (justVisible) {
                var justVisible = typeof justVisible === 'undefined' ? true : justVisible;
    
                if (justVisible) {
                    var visibleCheckboxes = $("li input[type='checkbox']:not(:disabled)", this.$ul).filter(":visible");
                    visibleCheckboxes.prop('checked', false);
    
                    var values = visibleCheckboxes.map(function () {
                        return $(this).val();
                    }).get();
    
                    $("option:enabled", this.$select).filter(function (index) {
                        return $.inArray($(this).val(), values) !== -1;
                    }).prop('selected', false);
    
                    if (this.options.selectedClass) {
                        $("li:not(.divider):not(.disabled)", this.$ul).filter(":visible").removeClass(this.options.selectedClass);
                    }
                }
                else {
                    $("li input[type='checkbox']:enabled", this.$ul).prop('checked', false);
                    $("option:enabled", this.$select).prop('selected', false);
    
                    if (this.options.selectedClass) {
                        $("li:not(.divider):not(.disabled)", this.$ul).removeClass(this.options.selectedClass);
                    }
                }
            },
    
            /** * Rebuild the plugin. * * Rebuilds the dropdown, the filter and the select all option. */
            rebuild: function () {
                this.$ul.html('');
    
                // Important to distinguish between radios and checkboxes.
                this.options.multiple = this.$select.attr('multiple') === "multiple";
    
                this.buildSelectAll();
                this.buildDropdownOptions();
                this.buildFilter();
    
                this.updateButtonText();
                this.updateSelectAll();
    
                if (this.options.disableIfEmpty && $('option', this.$select).length <= 0) {
                    this.disable();
                }
                else {
                    this.enable();
                }
    
                if (this.options.dropRight) {
                    this.$ul.addClass('pull-right');
                }
            },
    
            /** * The provided data will be used to build the dropdown. */
            dataprovider: function (dataprovider) {
    
                var groupCounter = 0;
                var $select = this.$select.empty();
    
                $.each(dataprovider, function (index, option) {
                    var $tag;
    
                    if ($.isArray(option.children)) { // create optiongroup tag
                        groupCounter++;
    
                        $tag = $('<optgroup/>').attr({
                            label: option.label || 'Group ' + groupCounter,
                            disabled: !!option.disabled
                        });
    
                        forEach(option.children, function (subOption) { // add children option tags
                            $tag.append($('<option/>').attr({
                                value: subOption.value,
                                label: subOption.label || subOption.value,
                                title: subOption.title,
                                selected: !!subOption.selected,
                                disabled: !!subOption.disabled
                            }));
                        });
                    }
                    else {
                        $tag = $('<option/>').attr({
                            value: option.value,
                            label: option.label || option.value,
                            title: option.title,
                            selected: !!option.selected,
                            disabled: !!option.disabled
                        });
                    }
    
                    $select.append($tag);
                });
    
                this.rebuild();
            },
    
            /** * Enable the multiselect. */
            enable: function () {
                this.$select.prop('disabled', false);
                this.$button.prop('disabled', false)
                    .removeClass('disabled');
            },
    
            /** * Disable the multiselect. */
            disable: function () {
                this.$select.prop('disabled', true);
                this.$button.prop('disabled', true)
                    .addClass('disabled');
            },
    
            /** * Set the options. * * @param {Array} options */
            setOptions: function (options) {
                this.options = this.mergeOptions(options);
            },
    
            /** * Merges the given options with the default options. * * @param {Array} options * @returns {Array} */
            mergeOptions: function (options) {
                return $.extend(true, {}, this.defaults, this.options, options);
            },
    
            /** * Checks whether a select all checkbox is present. * * @returns {Boolean} */
            hasSelectAll: function () {
                return $('li.multiselect-all', this.$ul).length > 0;
            },
    
            /** * Updates the select all checkbox based on the currently displayed and selected checkboxes. */
            updateSelectAll: function () {
                if (this.hasSelectAll()) {
                    var allBoxes = $("li:not(.multiselect-item):not(.filter-hidden) input:enabled", this.$ul);
                    var allBoxesLength = allBoxes.length;
                    var checkedBoxesLength = allBoxes.filter(":checked").length;
                    var selectAllLi = $("li.multiselect-all", this.$ul);
                    var selectAllInput = selectAllLi.find("input");
    
                    if (checkedBoxesLength > 0 && checkedBoxesLength === allBoxesLength) {
                        selectAllInput.prop("checked", true);
                        selectAllLi.addClass(this.options.selectedClass);
                        this.options.onSelectAll();
                    }
                    else {
                        selectAllInput.prop("checked", false);
                        selectAllLi.removeClass(this.options.selectedClass);
                    }
                }
            },
    
            /** * Update the button text and its title based on the currently selected options. */
            updateButtonText: function () {
                var options = this.getSelected();
    
                // First update the displayed button text.
                if (this.options.enableHTML) {
                    $('.multiselect .multiselect-selected-text', this.$container).html(this.options.buttonText(options, this.$select));
                }
                else {
                    $('.multiselect .multiselect-selected-text', this.$container).text(this.options.buttonText(options, this.$select));
                }
    
                // Now update the title attribute of the button.
                $('.multiselect', this.$container).attr('title', this.options.buttonTitle(options, this.$select));
            },
    
            /** * Get all selected options. * * @returns {jQUery} */
            getSelected: function () {
                return $('option', this.$select).filter(":selected");
            },
    
            /** * Gets a select option by its value. * * @param {String} value * @returns {jQuery} */
            getOptionByValue: function (value) {
    
                var options = $('option', this.$select);
                var valueToCompare = value.toString();
    
                for (var i = 0; i < options.length; i = i + 1) {
                    var option = options[i];
                    if (option.value === valueToCompare) {
                        return $(option);
                    }
                }
            },
    
            /** * Get the input (radio/checkbox) by its value. * * @param {String} value * @returns {jQuery} */
            getInputByValue: function (value) {
    
                var checkboxes = $('li input', this.$ul);
                var valueToCompare = value.toString();
    
                for (var i = 0; i < checkboxes.length; i = i + 1) {
                    var checkbox = checkboxes[i];
                    if (checkbox.value === valueToCompare) {
                        return $(checkbox);
                    }
                }
            },
    
            /** * Used for knockout integration. */
            updateOriginalOptions: function () {
                this.originalOptions = this.$select.clone()[0].options;
            },
    
            asyncFunction: function (callback, timeout, self) {
                var args = Array.prototype.slice.call(arguments, 3);
                return setTimeout(function () {
                    callback.apply(self || window, args);
                }, timeout);
            },
    
            setAllSelectedText: function (allSelectedText) {
                this.options.allSelectedText = allSelectedText;
                this.updateButtonText();
            }
        };
    
        $.fn.multiselect = function (option, parameter, extraOptions) {
            return this.each(function () {
                var data = $(this).data('multiselect');
                var options = typeof option === 'object' && option;
    
                // Initialize the multiselect.
                if (!data) {
                    data = new Multiselect(this, options);
                    $(this).data('multiselect', data);
                }
    
                // Call multiselect method.
                if (typeof option === 'string') {
                    data[option](parameter, extraOptions);
    
                    if (option === 'destroy') {
                        $(this).data('multiselect', false);
                    }
                }
            });
        };
    
        $.fn.multiselect.Constructor = Multiselect;
    
        $(function () {
            $("select[data-role=multiselect]").multiselect();
        });
    
    }(window.jQuery);

## HTML代码： ##

<asp:DropDownList runat="server" CssClass="form-control" multiple="multiple" ID="Caccey_location_ddl">
                                    </asp:DropDownList>
     <asp:DropDownList runat="server" CssClass="form-control" ID="cabinet_code_ddl" multiple="multiple" >
                                                </asp:DropDownList>
    
     <script type="text/javascript"> $(document).ready(function () { $('#MainContent_Caccey_location_ddl').multiselect({ includeSelectAllOption: true, enableFiltering: true, maxHeight: 400, numberDisplayed: 1 }); $('#MainContent_cabinet_code_ddl').multiselect({ includeSelectAllOption: true, enableFiltering: true, maxHeight: 400, numberDisplayed: 1, enableCaseInsensitiveFiltering: true }); });

## 清空勾选项： ##

$('option', $('#MainContent_cabinet_code_ddl')).each(function (element) { 
            $(this).removeAttr('selected').prop('selected', false);
        });
        $('#MainContent_cabinet_code_ddl').multiselect('refresh');

## 清空勾选项(先销毁，再绑定)： ##

$('#MainContent_cabinet_code_ddl').multiselect('destroy');
     $('#MainContent_cabinet_code_ddl').multiselect({
            includeSelectAllOption: true,
            enableFiltering: true,
            maxHeight: 400,
            numberDisplayed: 1
        });

## 获取勾选项数据： ##

var cabinet_code = "";
        $("#MainContent_cabinet_code_ddl").next().find(".multiselect-container .active").each(function () {
            var value = $(this).find(" a label input").val();
            if (value != "" && value != "multiselect-all" && (typeof (value) != "undefined")) {
                cabinet_code += "'" + value + "',";
            }
        })

## 动态切换下拉框： ##

![这里写图片描述][20160127161348159]

[20151104115410821]: /images/20220731/3dea8ff85d124b128566da5c4057d5db.png
[20151104115429802]: /images/20220731/3c98431ab3364344b731117de921c76c.png
[20160127161348159]: /images/20220731/a0525b1aeff340f9bb294be31d9203cd.png