vue中匯出element表格的資料會使表格的資料進行改變(vue+elelement實現匯出功能)
阿新 • • 發佈:2021-02-05
vue中匯出element表格的資料會使表格的資料進行改變(前提是後端的返回一個欄位前端按照欄位資料不同進行不同的頁面資料渲染)
備註:(下面實現匯出功能)
這是後端返回的的資料顯示不同的狀態效果
那麼顯示有一個需求是匯入當前頁面中的element表格的所有資料
methods:{
resultDataList(){
let params = {
start_time: new Date( new Date().getTime()864000000)toISOString() // 轉為國際化時間 開始時間
end_time: new. Date().toISOString() // 轉為國際化時間 結束時間
index: '',
size: '',
}
// data裡面定義一個變數resultData結束介面
axios.post('http://location:3000/infouser/terraceConsignee', params).then(res => {
this.resultData = res.data
})
}
}
// created呼叫
created(){
this.resultDataList()
}
為什麼這裡是post請求而不是get請求? 其實在傳入日期的時候是國際化時間post請會做相應的處理而get請求不會
怎麼下面就是實現匯出功能(一般匯出為xlsx)
//匯出點選事件為handleDownload()
methods:{
handleDownload(){
let { export_json_to_excel } = require('vendor/Export2Excel')
// 將狀態進行改變
let result = this.resultData
let resultend = result
resultend.map(res => {
// 這裡可以用三元運算子
if (res.error_mark) {
res.error_mark = '失敗'
} else {
res.error_mark = '成功'
}
let data = this.formatJson(filterVal, list)
export_json_to_excel(data)
})
},
formatJson (filterVal, jsonData) {
return jsonData.map(v => filterVal.map(j => v[j]))
},
}
那麼看下效果
這是沒有點選匯出按鈕的時候的效果仔細看
這裡是匯出按鈕的效果
我絕對沒有切換任何頁面的想法
原因是什麼?
是由於深拷貝跟淺拷貝的原理
怎麼處理?
handleDownload(){
let { export_json_to_excel } = require('vendor/Export2Excel')
// 將狀態進行改變
let result = JSON.stringify(this.resultData) // 轉為json字串
let resultend = JSON.parse(result) // 然後在轉回來
resultend.map(res => {
// 這裡可以用三元運算子
if (res.error_mark) {
res.error_mark = '失敗'
} else {
res.error_mark = '成功'
}
let data = this.formatJson(filterVal, list)
export_json_to_excel(data)
})
},
實現匯出功能
新建資料夾vendor跟兩個js檔案Blob.js和Export2Excel.js
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檔案
注意:得下載依賴 file-saver 和 xlsx
/* eslint-disable */
require('file-saver');
require('./Blob.js');
import XLSX from 'xlsx'
function generateArray(table) {
let out = [];
let rows = table.querySelectorAll('tr');
let ranges = [];
for (let R = 0; R < rows.length; ++R) {
let outRow = [];
let row = rows[R];
let columns = row.querySelectorAll('td');
for (let C = 0; C < columns.length; ++C) {
let cell = columns[C];
let colspan = cell.getAttribute('colspan');
let rowspan = cell.getAttribute('rowspan');
let 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 (let 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 (let k = 0; k < colspan - 1; ++k) outRow.push(null);
}
out.push(outRow);
}
return [out, ranges];
};
function datenum(v, date1904) {
if (date1904) v += 1462;
let 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) {
let ws = {};
let range = {s: {c: 10000000, r: 10000000}, e: {c: 0, r: 0}};
for (let R = 0; R != data.length; ++R) {
for (let 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;
let cell = {v: data[R][C]};
if (cell.v == null) continue;
let 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) {
let buf = new ArrayBuffer(s.length);
let view = new Uint8Array(buf);
for (let i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
return buf;
}
export function export_table_to_excel(id) {
let theTable = document.getElementById(id);
let oo = generateArray(theTable);
let ranges = oo[1];
/* original data */
let data = oo[0];
let ws_name = "SheetJS";
let 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;
let 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 */
let data = jsonData;
data.unshift(th);
let ws_name = "SheetJS";
let wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
/*設定worksheet每列的最大寬度*/
let colWidth = data.map(function (row) {
return row.map(function (val) {
/*先判斷是否為null/undefined*/
if (val == null) {
return { 'wch': 10 };
}
/*再判斷是否為中文*/
else if (val.toString().charCodeAt(0) > 255) {
return { 'wch': val.toString().length * 2 };
} else {
return { 'wch': val.toString().length };
}
});
});
/*以第一行為初始值*/
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;
let wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'});
let title = defaultTitle || '列表'
saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
}
vue頁面怎麼使用
<template>
<div>
<el-button @click="btnClick">匯出資料</el-button>
<div>
<el-table
:data="resultData"
style="width: 100%">
<el-table-column
type="index"
width="50">
</el-table-column>
<el-table-column
prop="name"
label="姓名"
width="120">
</el-table-column>
<el-table-column
prop="age"
label="年齡"
width="120">
</el-table-column>
<el-table-column
prop="sex"
label="性別">
</el-table-column>
<el-table-column
>
<template v-slot="{row}">
<span>{{errorState(row.state)}}</span>
</template>
</el-table-column>
</el-table>
</div>
</div>
</template>
<script>
import axios from 'axios'
export default {
data() {
return {
resultData:[],
}
},
methods: {
btnClick(){
require.ensure([], () => {
let { export_json_to_excel } = require('../../vendor/Export2Excel')
let result = this.resultData
// 請與本頁面中element元件table中的label同名
const tHeader = ['序號','姓名', '年齡','性別','狀態']
// 資料裡面匯出的資料(與後端返回來的欄位相同)
const filterVal = ['index','name', 'age', 'sex','state']
let data = this.formatJson(filterVal,result)
/*
export_json_to_excel
第一個 代表表頭
第二個 資料裡面匯出的資料
第三個匯出的名字
*/
export_json_to_excel(tHeader,data,'列表excel')
})
},
formatJson (filterVal, jsonData) {
return jsonData.map(v => filterVal.map(j => v[j]))
},
tableDataList(){
// noed本地服務
axios.get('http://localhost:3000/api/exportData').then(res=>{
console.log(res)
if (res.status === 200 && res.data){
this.resultData = res.data.data
}
})
},
errorState(blod){
return blod ? '成功' : '失敗'
},
},
created() {
this.tableDataList()
}
}
</script>
<style>
</style>