用jquery-ui Autocomplete一步一步实现输入自动补全

小鱼儿 2022-09-19 15:28 277阅读 0赞

首先看一下效果,如下图:

![Center][]

![Center 1][]

接下来看一下实现步骤:

第一步:下载jquery-ui,地址:[http://jqueryui.com/autocomplete][http_jqueryui.com_autocomplete]/

第二步:在页面引用,如下图:

![Center 2][]

图中红框内的为与Autocomplete相关的,其中,1,4是以上给出的地址中可以下载,注意把对应的图片

放置在正确的目录,3是jquery库,5是关键字高亮要用到的,jquery-ui默认不支持html,如果需要高亮关

键字,需要引用5。

页面需要自动补全的输入框:

2的内容如下：（自定义样式，可根据自己需求，进行修改）

/* highlight results */
    .ui-autocomplete span.hl_results {
        background-color: #ffff66;
    }
    
    /* loading - the AJAX indicator */
    .ui-autocomplete-loading {
        background: white url('/css/images/ui-anim_basic_16x16.gif') right center no-repeat;
    }
    
    /* scroll results */
    .ui-autocomplete {
        max-height: 250px;
        overflow-y: auto;
        /* prevent horizontal scrollbar */
        overflow-x: hidden;
        /* add padding for vertical scrollbar */
        padding-right: 5px;
    }
    
    .ui-autocomplete li {
        font-size: 16px;
    }
    
    /* IE 6 doesn't support max-height
    * we use height instead, but this forces the menu to always be this tall
    */
    * html .ui-autocomplete {
        height: 250px;
    }

5的内容如下：

/*
     * jQuery UI Autocomplete HTML Extension
     *
     * Copyright 2010, Scott González (http://scottgonzalez.com)
     * Dual licensed under the MIT or GPL Version 2 licenses.
     *
     * http://github.com/scottgonzalez/jquery-ui-extensions
     */
    (function( $ ) {
    
    var proto = $.ui.autocomplete.prototype,
    	initSource = proto._initSource;
    
    function filter( array, term ) {
    	var matcher = new RegExp( $.ui.autocomplete.escapeRegex(term), "i" );
    	return $.grep( array, function(value) {
    		return matcher.test( $( "<div>" ).html( value.label || value.value || value ).text() );
    	});
    }
    
    $.extend( proto, {
    	_initSource: function() {
    		if ( this.options.html && $.isArray(this.options.source) ) {
    			this.source = function( request, response ) {
    				response( filter( this.options.source, request.term ) );
    			};
    		} else {
    			initSource.call( this );
    		}
    	},
    
    	_renderItem: function( ul, item) {
    		return $( "<li></li>" )
    			.data( "item.autocomplete", item )
    			.append( $( "<a></a>" )[ this.options.html ? "html" : "text" ]( item.label ) )
    			.appendTo( ul );
    	}
    });
    
    })( jQuery );

6的内容如下：

$(function() {
    	var cache = {};
        $("#searchContent").autocomplete({
            source:function(request, response) {
    			var term = request.term;
    			if (term in cache) {
    				response(cache[term]);
    				return;
    			}
    			$.ajax({
    				type : "POST",
    				url : "autoComplete.action",
    				data : "term=" + request.term,
    				dataType : "json",
    				success : function(data) {
    					// 解析为js对象
    					var result = JSON.parse(data);
    					response(result);
    				},
    				error : function() {
    					alert("错误");
    				}
    			});
    
    		},
            minLength: 1,
            /*
             * 选中后的处理
             * select: function(event, ui) {
                var url = ui.item.id;
                if(url != '#') {
                    location.href = '/blog/' + url;
                }
            },*/
    
            html: true, // optional (jquery.ui.autocomplete.html.js required)
    	    // optional (if other layers overlap autocomplete list)
            open: function(event, ui) {
                $(".ui-autocomplete").css("z-index", 1000);
            }
        });
    
    });
    }

后台传送的JSON数据格式：

[
        {
            "id": "mysql-in-a-nutshell",
            "value": "MySQL in a Nutshell",
            "label": "<span class=\"hl_results\">MySQL</span> in a Nutshell"
        },
        {
            "id": "how-to-use-php-improved-mysqli-extension-and-why-you-should",
            "value": "How to Use PHP Improved MySQLi extension (and Why You Should)",
            "label": "How to Use PHP Improved <span class=\"hl_results\">MySQL</span>i extension (and Why You Should)"
        },
        {
            "id": "is-it-time-to-remove-mysql-in-favor-of-mariadb-in-production-servers",
            "value": "Is it time to Remove MySQL in favor of MariaDB in Production Servers?",
            "label": "Is it time to Remove <span class=\"hl_results\">MySQL</span> in favor of MariaDB in Production Servers?"
        }
    ]

java后台(Struts2):

Struts配置:

<action name="autoComplete" class="GoodsAction" method="autoComplete">
    			<result type="json">
    				<param name="root">result</param>
    			</result>
    		</action>

Action(这里采用lucene搜索方式):

private String term;
    private String result; 
    
    public String autoComplete() {
    		List<AutoBean> abs = new ArrayList<AutoBean>();
    		if (!term.trim().equals("")) {
    			// 索引目录
    			String filepath = ServletActionContext.getServletContext().getRealPath("/index");
    			LuceneSearch<Goods> searcher = new AutocompleteQuery(new File(filepath));
    			List<Goods> goods = searcher.search(term.trim(), "mixName");
    			int size = goods.size();
    			int min = (size > 10) ? 10 : size;  //设置最大显示条目为10
    			if (goods != null && size > 0) {
    				for (int i = 0; i < min; i++) {
    					Goods g = goods.get(i);
    					AutoBean ab = new AutoBean();
    					ab.setId(g.getNeedName());
    					ab.setValue(g.getNeedName());
    					ab.setLabel(g.getName());
    					abs.add(ab);
    				}
    				JSON json = JSONSerializer.toJSON(abs);
    				this.result = json.toString();
    				return SUCCESS;
    			}
    		}
    		return SUCCESS;
    	}

以上省略了部分代码,主要是传递的json数据需要有id,value,Label属性,label中可以加入html进行高亮,value

是选中后在输入框输入的值,所以需要设置原值,不能加入html。

关键字高亮可以使用lucene的Highlighter来实现。这里不再赘述，有问题可以留言。。。

这里在需要高亮的字上加上以下标签：

`<spanclass="hl_results">`  关键字`</span>`

参考网址：[http://www.pontikis.net/blog/jquery-ui-autocomplete-step-by-step][http_www.pontikis.net_blog_jquery-ui-autocomplete-step-by-step]

[Center]: /images/20220828/b945b16c7044447db2a674eba8c02e36.png
[Center 1]: /images/20220828/be4f383d693349adb6ac74676db1960a.png
[http_jqueryui.com_autocomplete]: http://jqueryui.com/autocomplete/
[Center 2]: /images/20220828/f4c27e5672cb4ab28f7d8d0b381cc27a.png
[http_www.pontikis.net_blog_jquery-ui-autocomplete-step-by-step]: http://www.pontikis.net/blog/jquery-ui-autocomplete-step-by-step