前端导出Excel文件,并将导出按钮封装成组件使用

女爷i 2022-10-16 02:57 197阅读 0赞

下载安装  
npm install --save file-saver  
npm install --save xlsx  
npm install --save script-loader

组件

<template>
      <div class="tableexporttyle">
        <a-button type="primary" @click="exportExcelData" icon="cloud-download" >导出信息</a-button>
      </div>
    </template>
    <script>
    
    export default { 
      props:{ 
        columns: { 
          type: Array
        },
        excelName: { 
          type: String
        },
        exportdata: { 
          type: Array
        },
      },
      methods:{ 
        exportExcelData() { 
          //导出Excel按钮
          let columnTitle = this.columns; //横着标题
          let columnData = this.exportdata; //数据
          let excelName = this.excelName
          this.exportExcel(columnTitle, columnData, excelName); //调用封装好的方法
        },
        // 导出Excel
        exportExcel(columns, list, excelName) { 
          require.ensure([], () => { 
            const { 
              export_json_to_excel
            } = require("../vendor/vender/Export2Excel");
            let tHeader = [];
            let filterVal = [];
            columns.forEach(item => { 
              tHeader.push(item.title);
              filterVal.push(item.key);
            });
            let data = this.formatJson(list, filterVal);
            export_json_to_excel(tHeader, data, excelName);
          });
        },
        formatJson(list, filterVal) { 
          return list.map(v => filterVal.map(j => v[j]));
        }
      }
    };
    </script>
    <style scoped>
    .tableexporttyle{ 
      display: inline-block;
    }
    </style>

Blob.js

/* eslint-disable */
    /* Blob.js * A Blob implementation. * 2014-05-27 * * By Eli Grey, http://eligrey.com * By Devin Samarin, https://github.com/eboyjr * License: X11/MIT * See LICENSE.md */
     
    /*global self, unescape */
    /*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true, plusplus: true */
     
    /*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */
     
    (function (view) { 
        "use strict";
     
        view.URL = view.URL || view.webkitURL;
     
        if (view.Blob && view.URL) { 
            try { 
                new Blob;
                return;
            } catch (e) {  }
        }
     
        // Internally we use a BlobBuilder implementation to base Blob off of
        // in order to support older browsers that only have BlobBuilder
        var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function (view) { 
            var
                get_class = function (object) { 
                    return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1];
                }
                , FakeBlobBuilder = function BlobBuilder() { 
                    this.data = [];
                }
                , FakeBlob = function Blob(data, type, encoding) { 
                    this.data = data;
                    this.size = data.length;
                    this.type = type;
                    this.encoding = encoding;
                }
                , FBB_proto = FakeBlobBuilder.prototype
                , FB_proto = FakeBlob.prototype
                , FileReaderSync = view.FileReaderSync
                , FileException = function (type) { 
                    this.code = this[this.name = type];
                }
                , file_ex_codes = (
                    "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR "
                    + "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
                ).split(" ")
                , file_ex_code = file_ex_codes.length
                , real_URL = view.URL || view.webkitURL || view
                , real_create_object_URL = real_URL.createObjectURL
                , real_revoke_object_URL = real_URL.revokeObjectURL
                , URL = real_URL
                , btoa = view.btoa
                , atob = view.atob
     
                , ArrayBuffer = view.ArrayBuffer
                , Uint8Array = view.Uint8Array
                ;
            FakeBlob.fake = FB_proto.fake = true;
            while (file_ex_code--) { 
                FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
            }
            if (!real_URL.createObjectURL) { 
                URL = view.URL = { };
            }
            URL.createObjectURL = function (blob) { 
                var
                    type = blob.type
                    , data_URI_header
                    ;
                if (type === null) { 
                    type = "application/octet-stream";
                }
                if (blob instanceof FakeBlob) { 
                    data_URI_header = "data:" + type;
                    if (blob.encoding === "base64") { 
                        return data_URI_header + ";base64," + blob.data;
                    } else if (blob.encoding === "URI") { 
                        return data_URI_header + "," + decodeURIComponent(blob.data);
                    } if (btoa) { 
                        return data_URI_header + ";base64," + btoa(blob.data);
                    } else { 
                        return data_URI_header + "," + encodeURIComponent(blob.data);
                    }
                } else if (real_create_object_URL) { 
                    return real_create_object_URL.call(real_URL, blob);
                }
            };
            URL.revokeObjectURL = function (object_URL) { 
                if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) { 
                    real_revoke_object_URL.call(real_URL, object_URL);
                }
            };
            FBB_proto.append = function (data/*, endings*/) { 
                var bb = this.data;
                // decode data to a binary string
                if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) { 
                    var
                        str = ""
                        , buf = new Uint8Array(data)
                        , i = 0
                        , buf_len = buf.length
                        ;
                    for (; i < buf_len; i++) { 
                        str += String.fromCharCode(buf[i]);
                    }
                    bb.push(str);
                } else if (get_class(data) === "Blob" || get_class(data) === "File") { 
                    if (FileReaderSync) { 
                        var fr = new FileReaderSync;
                        bb.push(fr.readAsBinaryString(data));
                    } else { 
                        // async FileReader won't work as BlobBuilder is sync
                        throw new FileException("NOT_READABLE_ERR");
                    }
                } else if (data instanceof FakeBlob) { 
                    if (data.encoding === "base64" && atob) { 
                        bb.push(atob(data.data));
                    } else if (data.encoding === "URI") { 
                        bb.push(decodeURIComponent(data.data));
                    } else if (data.encoding === "raw") { 
                        bb.push(data.data);
                    }
                } else { 
                    if (typeof data !== "string") { 
                        data += ""; // convert unsupported types to strings
                    }
                    // decode UTF-16 to binary string
                    bb.push(unescape(encodeURIComponent(data)));
                }
            };
            FBB_proto.getBlob = function (type) { 
                if (!arguments.length) { 
                    type = null;
                }
                return new FakeBlob(this.data.join(""), type, "raw");
            };
            FBB_proto.toString = function () { 
                return "[object BlobBuilder]";
            };
            FB_proto.slice = function (start, end, type) { 
                var args = arguments.length;
                if (args < 3) { 
                    type = null;
                }
                return new FakeBlob(
                    this.data.slice(start, args > 1 ? end : this.data.length)
                    , type
                    , this.encoding
                );
            };
            FB_proto.toString = function () { 
                return "[object Blob]";
            };
            FB_proto.close = function () { 
                this.size = this.data.length = 0;
            };
            return FakeBlobBuilder;
        }(view));
     
        view.Blob = function Blob(blobParts, options) { 
            var type = options ? (options.type || "") : "";
            var builder = new BlobBuilder();
            if (blobParts) { 
                for (var i = 0, len = blobParts.length; i < len; i++) { 
                    builder.append(blobParts[i]);
                }
            }
            return builder.getBlob(type);
        };
    }(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));

Export2Excel.js

/* eslint-disable */
    // require('script-loader!file-saver');
    // require('script-loader!@/vendor/Blob');
    require('script-loader!file-saver');
    require('./Blob');
    require('script-loader!xlsx/dist/xlsx.core.min');
    import XLSX from 'xlsx'
     
    function generateArray(table) { 
        var out = [];
        var rows = table.querySelectorAll('tr');
        var ranges = [];
        for (var R = 0; R < rows.length; ++R) { 
            var outRow = [];
            var row = rows[R];
            var columns = row.querySelectorAll('td');
            for (var C = 0; C < columns.length; ++C) { 
                var cell = columns[C];
                var colspan = cell.getAttribute('colspan');
                var rowspan = cell.getAttribute('rowspan');
                var cellValue = cell.innerText;
                if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue;
     
                //Skip ranges
                ranges.forEach(function (range) { 
                    if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) { 
                        for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
                    }
                });
     
                //Handle Row Span
                if (rowspan || colspan) { 
                    rowspan = rowspan || 1;
                    colspan = colspan || 1;
                    ranges.push({  s: {  r: R, c: outRow.length }, e: {  r: R + rowspan - 1, c: outRow.length + colspan - 1 } });
                }
                ;
     
                //Handle Value
                outRow.push(cellValue !== "" ? cellValue : null);
     
                //Handle Colspan
                if (colspan) for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
            }
            out.push(outRow);
        }
        return [out, ranges];
    };
     
    function datenum(v, date1904) { 
        if (date1904) v += 1462;
        var epoch = Date.parse(v);
        return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
    }
     
    function sheet_from_array_of_arrays(data, opts) { 
        var ws = { };
        var range = {  s: {  c: 10000000, r: 10000000 }, e: {  c: 0, r: 0 } };
        for (var R = 0; R != data.length; ++R) { 
            for (var C = 0; C != data[R].length; ++C) { 
                if (range.s.r > R) range.s.r = R;
                if (range.s.c > C) range.s.c = C;
                if (range.e.r < R) range.e.r = R;
                if (range.e.c < C) range.e.c = C;
                var cell = {  v: data[R][C] };
                if (cell.v == null) continue;
                var cell_ref = XLSX.utils.encode_cell({  c: C, r: R });
     
                if (typeof cell.v === 'number') cell.t = 'n';
                else if (typeof cell.v === 'boolean') cell.t = 'b';
                else if (cell.v instanceof Date) { 
                    cell.t = 'n';
                    cell.z = XLSX.SSF._table[14];
                    cell.v = datenum(cell.v);
                }
                else cell.t = 's';
     
                ws[cell_ref] = cell;
            }
        }
        if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
        return ws;
    }
     
    function Workbook() { 
        if (!(this instanceof Workbook)) return new Workbook();
        this.SheetNames = [];
        this.Sheets = { };
    }
     
    function s2ab(s) { 
        var buf = new ArrayBuffer(s.length);
        var view = new Uint8Array(buf);
        for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
        return buf;
    }
     
    export function export_table_to_excel(id) { 
        var theTable = document.getElementById(id);
        var oo = generateArray(theTable);
        var ranges = oo[1];
     
        /* original data */
        var data = oo[0];
        var ws_name = "SheetJS";
     
        var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
     
        /* add ranges to worksheet */
        // ws['!cols'] = ['apple', 'banan'];
        ws['!merges'] = ranges;
     
        /* add worksheet to workbook */
        wb.SheetNames.push(ws_name);
        wb.Sheets[ws_name] = ws;
     
        var wbout = XLSX.write(wb, {  bookType: 'xlsx', bookSST: false, type: 'binary' });
     
        saveAs(new Blob([s2ab(wbout)], {  type: "application/octet-stream" }), "test.xlsx")
    }
     
    export function export_json_to_excel(th, jsonData, defaultTitle) { 
     
        /* original data */
     
        var data = jsonData;
        data.unshift(th);
        var ws_name = "SheetJS";
     
        var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
     
        /*设置worksheet每列的最大宽度*/
        const colWidth = data.map(row => row.map(val => { 
            /*先判断是否为null/undefined*/
            if (val == null) { 
                return {  'wch': 10 };
            }
            /*再判断是否为中文*/
            else if (val.toString().charCodeAt(0) > 255) { 
                return {  'wch': val.toString().length * 2 };
            } else { 
                return {  'wch': val.toString().length };
            }
        }))
        /*以第一行为初始值*/
        let result = colWidth[0];
        for (let i = 1; i < colWidth.length; i++) { 
            for (let j = 0; j < colWidth[i].length; j++) { 
                if (result[j]['wch'] < colWidth[i][j]['wch']) { 
                    result[j]['wch'] = colWidth[i][j]['wch'];
                }
            }
        }
        ws['!cols'] = result;
     
        /* add worksheet to workbook */
        wb.SheetNames.push(ws_name);
        wb.Sheets[ws_name] = ws;
     
        var wbout = XLSX.write(wb, {  bookType: 'xlsx', bookSST: false, type: 'binary' });
        var title = defaultTitle || 'excel-list'
        saveAs(new Blob([s2ab(wbout)], {  type: "application/octet-stream" }), title + ".xlsx")
    }