Vue-xlsx excelファイルエクスポート振り回すメモ

15886 ワード

ぜんせん
最近またvue-element-ui-pcプロジェクトの中でデータをexcelの需要にエクスポートする必要があることを书いて、そこでやっと振り回すことを始めて、仕方がなくて、谁が前にvueのエクスポートデータを书いたことがなくて、振り回すことができない攻城狮と病猫にどんな区别があって、多く言わないで、考えとコードを书きます.
幸いなことに、2日間振り回してjs-xlsxという東東を発見しました.1つの機能はとても強いexcel処理ライブラリで、ただ各種のフォーマットexcelをダウンロードして、またexcelを読むことを支持して、そこで私は公式サイトの例を参考にしてやってみました.実は原理もよく分かりません.ただ、作った車輪を使っているだけです.
最初に、このプラグインで注意しなければならないいくつかの場所に書きます.
           
npm install [email protected]            
npm install --save-dev script-loader               import  ,      `script-loader`            。
npm install xlsx   //       js-xlsx    
npm install jszip  //       ////        

Step 1
まず、まず、パッケージの共通のエクスポートjsを格納する共通フォルダを作成します.ここではvendorと名付け、パッケージされた3つのファイルを格納します.それぞれ
1,Blog.js
//Blog.js     ,      ,           。
/* eslint-disable */
(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));

2,Export2Excel.js
//                 export_table_to_excel export_json_to_excel,    export_json_to_excel         ,          。
/* eslint-disable */
require('script-loader!file-saver');
require('script-loader!@/vendor/Blob');
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({ header, data, filename = 'excel-list', autoWidth = true } = {}) {
    /* original data */
    data = [...data]
    data.unshift(header);
    var ws_name = "SheetJS";
    var wb = new Workbook(),
        ws = sheet_from_array_of_arrays(data);

    if (autoWidth) {
        /*  worksheet       */
        const colWidth = data.map(row => row.map(val => {
                /*      null/undefined*/
                if (val == null) {
                    return { 'wch': 10 };
                }
                /*        */
                else if (val.toString().charCodeAt(0) > 255) {
                    return { 'wch': val.toString().length * 2 };
                } else {
                    return { 'wch': val.toString().length };
                }
            }))
            /*        */
        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' });
    saveAs(new Blob([s2ab(wbout)], { type: "application/octet-stream" }), filename + ".xlsx");
}

2,Export2Zip.js
//   export_txt_to_zip    ,         
/* eslint-disable */
require('script-loader!file-saver');
import JSZip from 'jszip'

export function export_txt_to_zip(th, jsonData, txtName, zipName) {
  const zip = new JSZip()
  const txt_name = txtName || 'file'
  const zip_name = zipName || 'file'
  const data = jsonData
  let txtData = `${th}\r
` data.forEach((row) => { let tempStr = '' tempStr = row.toString() txtData += `${tempStr}\r
` }) zip.file(`${txt_name}.txt`, txtData) zip.generateAsync({type:"blob"}).then((blob) => { saveAs(blob, `${zip_name}.zip`) }, (err) => { alert(' ') }) }

次はページで使います
      

export default {
  data() {
    return {
           list: [
        {
          author: "Carol",
          comment_disabled: true,
          content_short: "      ",
          display_time: "1974-06-19 10:01:57",
          forecast: 71.85,
          id: 1,
          importance: 2,
          pageviews: 1670,
          reviewer: "Ruth",
          status: "deleted",
          timestamp: 1126391703464,
          title: " i v           v    ",
          type: "JP"
        }
      ],
      listLoading: true,
      downloadLoading: false,
      filename: "",
      autoWidth: true
    };
  },
  methods: {
    ExportData() {
      console.log("    ");
      import("@/vendor/Export2Excel").then(excel => {
  //       
        const tHeader = ["Id", "Title", "Author", "Readings", "Date"];
//              
        const filterVal = [
          "id",
          "title",
          "author",
          "pageviews",
          "display_time"
        ];
        const list = this.list;
        const data = this.formatJson(filterVal, list);
   //      export_json_to_excel     ,      
        excel.export_json_to_excel({
          header: tHeader,
          data,
          filename: this.filename,
          autoWidth: this.autoWidth
        });
        this.downloadLoading = false;
      });
    },
//   
    formatJson(filterVal, jsonData) {
      return jsonData.map(v =>
        filterVal.map(j => {
          // if (j === "timestamp") {
            // return parseTime(v[j]);
          // } else {
            return v[j];
          // }
        })
      );
},
  }
};


終わりの言葉
これで、vueのあちこちexcelができました.他の2つは、今回はdemoを書いていません.後期更新時に更新されます.やはりその言叶が需要に出会って、需要を迎えて、何度も振り回すといいです.今回の振り回された結果を記録して、自分で簡単にまとめても仲間たちに助けてほしいと思っています.共通コンポーネントを使用するには、更新されたvue-xlsxを参照してデータ共通コンポーネントをエクスポートします.