vue前端导出复杂表头Excel
最近因为业务需求，需要做一个导出复杂表头为Excel的功能，需要要导出的页面如下：
字段实在是太多了，截不完。。。这是一个二级表头的
1、安装
npm install file-saver xlsx -S
npm install script-loader -D
这是生成excel表格所需要的的依赖
2、在src目录下建立一个vendor的文件夹，里面存放Blob.js和Export2Excel2.js两个JS文件，这两个包的具体内容：
- 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(/^[objects(.*)]$/)[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));
-
Export2Excel2.js
其实就是主要引用了Export2Excel2.js这个文件里面
export_json_to_excel方法
/* eslint-disable */
import { saveAs } from 'file-saver'
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")
}
// 对此方法进行修改，如下：
export function export_json_to_excel({
multiHeader2 = [], // 第一行表头
multiHeader = [], // 第二行表头
header, // 第三行表头
data,
filename, //文件名
merges = [], // 合并
autoWidth = true,
bookType = 'xlsx'
} = {}) {
/* original data */
filename = filename || '列表';
data = [...data]
data.unshift(header);
for (let i = multiHeader2.length - 1; i > -1; i--) {
data.unshift(multiHeader2[i])
}
for (let i = multiHeader.length - 1; i > -1; i--) {
data.unshift(multiHeader[i])
}
var ws_name = "SheetJS";
var wb = new Workbook(),
ws = sheet_from_array_of_arrays(data);
if (merges.length > 0) {
if (!ws['!merges']) ws['!merges'] = [];
merges.forEach(item => {
ws['!merges'].push(XLSX.utils.decode_range(item))
})
}
if (autoWidth) {
/*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: bookType,
bookSST: false,
type: 'binary'
});
saveAs(new Blob([s2ab(wbout)], {
type: "application/octet-stream"
}), `${filename}.${bookType}`);
}
3. 在你要导出excel文件的vue组件中添加两个方法
handleExportMarketingList()和formatJson，再将导出的按钮添加一个点击事件,绑定handleExportMarketingList
<div style="margin-left: 20px;margin-top: 6px; margin-bottom: 6px; ">
<el-button type="info" size="small" @click="handleExportMarketingList">Export</el-button>
</div>
// 导出复杂表头
handleExportMarketingList() {
require.ensure([], () => {
const {export_json_to_excel} = require('@/vendor/Export2Excel2');
//multiHeader数组里面添加的是一级表头的名称，要按顺序添加每个表头的的名称，如果遇到横向合并单元格的地方，合并了多少个单元格，就要留几个空字符串占位
const multiHeader = [
[
'Project ID#', 'Project/Product Name', 'Customer', 'Product Type', 'Project Type', 'Resource Availability', 'System Owner',
'Architecture', 'Form Factor', 'Platform', 'When To Start', 'Project Complete Target', 'Project Total Expense', '', '', '',
'FY2022 (K$)--Q1 FCST', '', '', '', 'FY2022 (K$)--Q2 FCST', '', '', '', 'FY2022 (K$)--Q3 FCST', '', '', '', 'FY2022 (K$)--Q4 FCST',
'', '', '', 'FY2022 (K$)--FY2022 Outlook', '', '', '', 'Actual Spending Before FY2022', '', '', '', 'Spending After FY2022', '', '', '', 'Comment',
],
];
//tHeader数组里面放的是二级表头的名称，也要按顺序添加每个表头的的名称，添加的时候要注意，如果是一级表头上下单元格合并地方，要用空字符串补上占位。
const tHeader = [
'', '', '', '', '', '', '', '', '', '', '', '', 'Material', 'NRE', 'Cert', 'TTL', 'Material', 'NRE', 'Cert', 'TTL',
'Material', 'NRE', 'Cert', 'TTL', 'Material', 'NRE', 'Cert', 'TTL', 'Material', 'NRE', 'Cert', 'TTL', 'Material', 'NRE', 'Cert', 'TTL',
'Material', 'NRE', 'Cert', 'TTL', 'Material', 'NRE', 'Cert', 'TTL', '',
];
//filterVal数组里面放的是表头title对应的字段名称
const filterVal = ['id', 'name', 'customer', 'product_type', 'project_type', 'resource_availability', 'system_owner',
'architecture', 'form_factor', 'platform', 'when_to_start', 'project_complete_target', 'total_material', 'total_nre',
'total_cert', 'total_ttl', 'q1_material', 'q1_nre', 'q1_cert', 'q1_ttl', 'q2_material', 'q2_nre', 'q2_cert', 'q2_ttl',
'q3_material', 'q3_nre', 'q3_cert', 'q3_ttl', 'q4_material', 'q4_nre', 'q4_cert', 'q4_ttl', 'outlook_material',
'outlook_nre', 'outlook_cert', 'outlook_ttl', 'actual_material', 'actual_nre', 'actual_cert', 'actual_ttl', 'spending_material',
'spending_nre', 'spending_cert', 'spending_ttl', 'comment',
];
// this.cash是后端返回来的数组，用map方法遍历，这里你可以改你想要的数据，最后用return将每个字段一次返回就好啦
const list = this.cash.map((item, key) => {
var product_type = '';
if (item.product_type === 0) {
this.product_type = 'Sustaining' || null
} else if (item.product_type === 1) {
this.product_type = 'NPI'
} else if (item.product_type === 2) {
this.product_type = 'Proposal'
} else if (item.product_type === 3) {
this.product_type = 'POC'
} else {
this.product_type = null
}
var project_type = '';
if (item.project_type === 0) {
this.project_type = 'Ongoing'
} else if (item.project_type === 1) {
this.project_type = 'Evaluating'
} else if (item.project_type === 2) {
this.project_type = 'Upcoming'
} else {
this.project_type = null
}
var resource_availability = '';
if (item.resource_availability === 0) {
this.resource_availability ='Staffed'
} else if (item.resource_availability === 1) {
this.resource_availability ='Un-staffed'
} else if (item.move_resource_availability === 2) {
this.resource_availability = 'Cancel'
} else if (item.move_resource_availability === 3) {
this.resource_availability = 'Done'
}else {
this.resource_availability = null
}
return {
id: item.id || null,
name: item.name || null,
customer: item.customer || null,
product_type: this.product_type || null,
project_type: this.project_type || null,
resource_availability: this.resource_availability || null,
system_owner: item.system_owner || null,
architecture: item.architecture || null,
form_factor: item.form_factor || null,
platform: item.platform || null,
when_to_start: item.when_to_start || null,
project_complete_target: item.project_complete_target || null,
total_material: item.total_material || null,
total_nre: item.total_nre || null,
total_cert: item.total_cert || null,
total_ttl: item.total_ttl || null,
q1_material: item.q1_material || null,
q1_nre: item.q1_nre || null,
q1_cert: item.q1_cert || null,
q1_ttl: item.q1_ttl || null,
q2_material: item.q2_material || null,
q2_nre: item.q2_nre || null,
q2_cert: item.q2_cert || null,
q2_ttl: item.q2_ttl || null,
q3_material: item.q3_material || null,
q3_nre: item.q3_nre || null,
q3_cert: item.q3_cert || null,
q3_ttl: item.q3_ttl || null,
q4_material: item.q4_material || null,
q4_nre: item.q4_nre || null,
q4_cert: item.q4_cert || null,
q4_ttl: item.q4_ttl || null,
outlook_material: item.outlook_material || null,
outlook_nre: item.outlook_nre || null,
outlook_cert: item.outlook_cert || null,
outlook_ttl: item.outlook_ttl || null,
actual_material: item.actual_material || null,
actual_nre: item.actual_nre || null,
actual_cert: item.actual_cert || null,
actual_ttl: item.actual_ttl || null,
spending_material: item.spending_material || null,
spending_nre: item.spending_nre || null,
spending_cert: item.spending_cert || null,
spending_ttl: item.spending_ttl || null,
comment: item.comment || null,
}
});
// merges是进行所有表头的单元格合并，数组里面的每个元素的填写规则是：按从左往右的顺序依次填写，字母是指excel里面的第几列，数字表示第几行，如果是上下的单元格合并，就是按从上往下填写，比如'A1:A2'代表的是A列的第一个单元格和A列的第二个单元格合并，如果是左右的单元格合并，也是从左往右填写，同理，
const merges = [
'A1:A2', 'B1:B2', 'C1:C2', 'D1:D2', 'E1:E2', 'F1:F2', 'G1:G2', 'H1:H2', 'I1:I2', 'J1:J2', 'K1:K2', 'L1:L2', 'M1:P1',
'Q1:T1', 'U1:X1', 'Y1:AB1', 'AC1:AF1', 'AG1:AJ1', 'AK1:AN1', 'AO1:AR1', 'AS1:AS2'
];
if(list) {
const data = this.formatJson(filterVal, list); // 生成json数据
export_json_to_excel({
multiHeader, // 这里是第一行的表头
header: tHeader, // 这里是第二行的表头
data,
filename: 'Cash plan', //这里填的是导出excel的名称
merges,
});
} else {
alert("暂无无数据");
}
});
},
formatJson(filterVal, jsonData) {
return jsonData.map(v => filterVal.map(j => v[j]))
},
4. 导出的excel表格长这样，撒花 ~
一张图截不下，只能截两次了，大概就是这样。。
