From 0-1, the front end reads the excel table and renders it to the interface
- This article aims to solve the need to realize the front-end reading form file, obtaining file content, and rendering to the interface without calling the back-end interface
- My other articles address scaling needs:
- Perform automatic cell merging after reading parsed tables
- After reading and analyzing the form , automatically set the cell color according to the data comparison analysis
- Perform data analysis (dialysis) after reading and parsing the table to generate echarts relationship diagrams that can meet user-defined needs
- Download interface form function
illustrate
The company usually does a lot of background management systems , and similar needs are very common. I have written similar posts, but they only put codes and never write notes and steps. Hey, not much to say, this article is a complete record:
premise
Usually I often use:
Ant Design + Angular
Element UI + Vue
Ant Design + Vue
For convenience, today we use Element UI + Vue to start directly
based on vue-element-admin
code repository
1. Code cloud address
2. github address
Step 1: Preparations
- Click to enter vue-element-admin download
- download unzip
- install dependencies, run
- run successfully
Step 2: Implement import table analysis
- Enter the following path;
src\views\dashboard\index.vue
- Delete useless code, ready to start;
<template>
<div class="dashboard-container">
</div>
</template>
<script>
export default {
name: 'Dashboard'
}
</script>
<style lang="scss" scoped>
</style>
- Add import button, save and refresh;
<template>
<div class="dashboard-container">
<!-- 导入按钮 -->
<div class="button_group">
<a
href="javascript:;"
class="button_s my_file el-button button_s el-button--primary el-button--small"
>
<input type="file" class="my_input" @change="importExcel" id="upload" />导入
</a>
</div>
<!-- 导入按钮 -->
</div>
</template>
<script>
export default {
name: 'Dashboard',
methods: {
/**
* 导入表格
*/
importExcel(e) {
}
}
}
</script>
<style lang="scss" scoped>
// 按钮样式
.button_group {
.button_s {
width: 78px;
margin: 5px 10px 5px 5px;
}
.button_m {
width: 100px;
margin: 5px 10px 5px 5px;
}
.my_file {
position: relative;
.my_input {
position: absolute;
opacity: 0;
width: 78px;
height: 30px;
top: 0;
left: 0;
}
}
}
// 按钮样式
</style>
-
Download xlsx , import;
-
Write the import form function, save and refresh;
<script>
import xlsx from "xlsx";
export default {
name: 'Dashboard',
methods: {
/**
* 导入表格
*/
importExcel(e) {
const files = e.target.files;
console.log(files);
if (!files.length) {
return ;
} else if (!/\.(xls|xlsx)$/.test(files[0].name.toLowerCase())) {
return alert("上传格式不正确，请上传xls或者xlsx格式");
}
const fileReader = new FileReader();
fileReader.onload = ev => {
try {
const data = ev.target.result;
const XLSX = xlsx;
const workbook = XLSX.read(data, {
type: "binary"
});
const wsname = workbook.SheetNames[0]; //取第一张表，wb.SheetNames[0]是获取Sheets中第一个Sheet的名字
const ws = XLSX.utils.sheet_to_json(workbook.Sheets[wsname]); //生成json表格内容，wb.Sheets[Sheet名]获取第一个Sheet的数据
const excellist = []; //清空接收数据
//编辑数据
for (var i = 0; i < ws.length; i++) {
excellist.push(ws[i]);
}
console.log("读取结果", excellist); // 此时得到的是一个内容是对象的数组需要处理
} catch (e) {
return alert("读取失败!");;
}
};
fileReader.readAsBinaryString(files[0]);
var input = document.getElementById("upload");
input.value = "";
}
}
}
</script>
-
Write the following table to test the function ;
-
Sometimes, the table title is in Chinese, and we want to get the English attribute name after reading, then add the following code and test again;
<script>
import xlsx from "xlsx";
export default {
name: 'Dashboard',
methods: {
getHeader(sheet) {
const XLSX = xlsx;
const headers = [];
const range = XLSX.utils.decode_range(sheet["!ref"]); // worksheet['!ref'] 是工作表的有效范围
let C;
/* 获取单元格值 start in the first row */
const R = range.s.r; // 行 // C 列
let i = 0;
for (C = range.s.c; C <= range.e.c; ++C) {
var cell =
sheet[
XLSX.utils.encode_cell({
c: C, r: R })
]; /* 根据地址得到单元格的值find the cell in the first row */
var hdr = "UNKNOWN" + C; // 如果有空表头，会替换为您想要的默认值replace with your desired default
// XLSX.utils.format_cell 生成单元格文本值
if (cell && cell.t) hdr = XLSX.utils.format_cell(cell);
if(hdr.indexOf('UNKNOWN') > -1){
if(!i) {
hdr = '__EMPTY';
}else {
hdr = '__EMPTY_' + i;
}
i++;
}
headers.push(hdr);
}
return headers;
},
/**
* 导入表格
*/
importExcel(e) {
const files = e.target.files;
console.log(files);
if (!files.length) {
return ;
} else if (!/\.(xls|xlsx)$/.test(files[0].name.toLowerCase())) {
return alert("上传格式不正确，请上传xls或者xlsx格式");
}
const fileReader = new FileReader();
fileReader.onload = ev => {
try {
const data = ev.target.result;
const XLSX = xlsx;
const workbook = XLSX.read(data, {
type: "binary"
});
const wsname = workbook.SheetNames[0]; //取第一张表，wb.SheetNames[0]是获取Sheets中第一个Sheet的名字
const ws = XLSX.utils.sheet_to_json(workbook.Sheets[wsname]); //生成json表格内容，wb.Sheets[Sheet名]获取第一个Sheet的数据
const excellist = []; //清空接收数据
//编辑数据
for (var i = 0; i < ws.length; i++) {
excellist.push(ws[i]);
}
console.log("读取结果", excellist); // 此时得到的是一个内容是对象的数组需要处理
// 获取表头2-1
const a = workbook.Sheets[workbook.SheetNames[0]];
const headers = this.getHeader(a);
console.log('headers', headers);
// 获取表头2-2
} catch (e) {
return alert("读取失败!");;
}
};
fileReader.readAsBinaryString(files[0]);
var input = document.getElementById("upload");
input.value = "";
}
}
}
</script>
We change the form to an irregular state, save it, and open the interface test
Step 3: Implement table rendering
- The interface adds table components .
<!-- 表格组件 -->
<div class="myTable">
<el-table
max-height="600"
:data="dataArr"
v-loading="tableLoading"
:span-method="objectSpanMethod"
border
style="width: 100%"
>
<el-table-column
:prop="item.prop"
:label="item.label"
:width="item.width"
v-for="(item, i) in tableColumn"
:key="i"
></el-table-column>
</el-table>
</div>
<!-- 表格组件 -->
data() {
return {
dataArr: [], // 表格内容数据数组
// countArr: {}, // 分析表格数据以及表头，得到一个对照数组，用来进行自定义合并，本文暂时只写基础，不介绍自动合并单元格了哟~~我的其他文章有写自定义合并实现方法~
tableColumn: [], // 表格表头配置数组
tableLoading: false // 表格是否loading
};
},
2. Add table rendering method .
Remarks: Part of the code in the table rendering method is used to map Chinese and English attribute names. This is a function I added. Sometimes it is not necessary to use it. You can modify the code according to your needs;
setTable(headers, excellist) {
const tableTitleData = []; // 存储表格表头数据
const tableMapTitle = {
}; // 设置表格内容中英文对照用
headers.forEach((_, i) => {
tableMapTitle[_] = "prop" + i;
tableTitleData.push({
prop: "prop" + i,
label: _,
width: 100
});
});
console.log("tableTitleData", tableTitleData);
// 映射表格内容属性名为英文
const newTableData = [];
excellist.forEach(_ => {
const newObj = {
};
Object.keys(_).forEach(key => {
newObj[tableMapTitle[key]] = _[key];
});
newTableData.push(newObj);
});
console.log('newTableData',newTableData);
this.tableColumn = tableTitleData;
this.dataArr = newTableData;
},
- Call the table rendering method .
// 在importExcel(e)方法中添加下面代码
// 渲染表格1-1
this.setTable(headers, excellist);
// 渲染表格1-2
- function test
epilogue
This code supports irregular data, and those without headers can also be rendered to the interface~~
Welcome everyone to point out the mistakes in my code~
If there is a better way to write, you are welcome to suggest it and make progress together~~