文章目录
- 功能简介
- 简单代码实现
- 效果
- 参考
功能简介
- 通过LuckyExcel的transformExcelToLucky方法， 我们可以把一个文件直接转成LuckySheet需要的json字符串， 之后我们就可以用LuckySheet预览excel
- LuckyExcel只能解析xlsx格式的excel文件，因此对于xls和csv的格式，我们需要通过XLSX来转化成xlsx格式，但在转化过程中会丢失样式
- 对于excel中存在很多的空白行，在显示的时候可能会出现卡顿，所以我们需要将过多的空白行移除
简单代码实现
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Excel File Upload and Preview with Luckysheet</title>
</head>
<body><!-- 文件上传控件 -->
<input type="file" id="fileUpload"/><!-- Luckysheet 的容器 -->
<div id="luckysheet" style="position: relative; width: 100%; height: 500px;"></div>
<script src="https://cdn.jsdelivr.net/npm/xlsx/dist/xlsx.full.min.js"></script><link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/luckysheet@latest/dist/plugins/css/pluginsCss.css'/>
<link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/luckysheet@latest/dist/plugins/plugins.css'/>
<link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/luckysheet@latest/dist/css/luckysheet.css'/>
<link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/luckysheet@latest/dist/assets/iconfont/iconfont.css'/>
<script src="https://cdn.jsdelivr.net/npm/luckysheet@latest/dist/plugins/js/plugin.js"></script>
<script src="https://cdn.jsdelivr.net/npm/luckysheet@latest/dist/luckysheet.umd.js"></script><script src="https://cdn.jsdelivr.net/npm/luckyexcel/dist/luckyexcel.umd.js"></script><script>const _xlsxType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';const _xlsType = 'application/vnd.ms-excel';const _csvType = 'text/csv';//如果后端是以流的方式返回，可以调用这个方法const handleExcel = (res, fileName) => {const file = getExcelFile(res, fileName);handleExcelFile(file);}// 获取Excel文件const getExcelFile = (res, fileName) => {// 根据文件后缀名判断文件类型if (fileName.endsWith('.xlsx')) {return new File([res], fileName, {type: _xlsxType});} else if (fileName.endsWith('.xls')) {return new File([res], fileName, {type: _xlsType});} else if (fileName.endsWith('.csv')) {return new File([res], fileName, {type: _csvType});} else {throw new Error("Unsupported file type");}}// 处理Excel文件const handleExcelFile = (file) => {const fileName = file.name;// 根据文件后缀名判断文件类型并进行处理if (fileName.endsWith('.xlsx')) {console.log("handle excel for xlsx type..", fileName);handleExcelForXlsxType(file, fileName);} else if (fileName.endsWith('.xls') || fileName.endsWith('.csv')) {console.log("handle excel for xls or csv type..", fileName);handleExcelForXlsAndCsvType(file, fileName);} else {throw new Error("Unsupported file type");}}// 处理xlsx类型的Excel文件const handleExcelForXlsxType = (file, fileName) => {const reader = new FileReader();reader.onload = function (event) {const data = new Uint8Array(event.target.result);const workbook = XLSX.read(data, {type: 'array'});// 获取Excel文件中的最大行数let maxRowCountFromExcel = getMaxRowCountFromExcel(workbook);// 如果行数大于100000，则处理Excel文件中的空行if (maxRowCountFromExcel > 1000000) {console.log("excel file has too many blank row..", maxRowCountFromExcel);handleBlankRowForExcelWithTooManyBlankRow(workbook);const xlsxFile = toXlsxExcelFile(workbook, fileName);createLuckySheet(xlsxFile);} else {createLuckySheet(file);}};reader.readAsArrayBuffer(file);}// 处理xls和csv类型的Excel文件const handleExcelForXlsAndCsvType = (file, fileName) => {const reader = new FileReader();// 读取文件完成后的回调函数reader.onload = function (event) {const data = new Uint8Array(event.target.result);// 读取Excel文件内容const workbook = XLSX.read(data, {type: 'array'});// 将Excel文件转换为xlsx类型const xlsxFile = toXlsxExcelFile(workbook, fileName);// 处理xlsx类型的Excel文件handleExcelForXlsxType(xlsxFile, fileName);};// 以ArrayBuffer的形式读取文件reader.readAsArrayBuffer(file);}/ 创建Luckysheetconst createLuckySheet = (file) => {// 销毁已存在的Luckysheetwindow.luckysheet.destroy();// 将Excel文件转换为Luckysheet的jsonLuckyExcel.transformExcelToLucky(file, function (exportJson, luckysheetfile) {if (exportJson.sheets == null || exportJson.sheets.length === 0) {throw new Error("Failed to load excel file");}// 创建Luckysheet的配置项const options = {container: 'luckysheet',data: exportJson.sheets, // title: exportJson.info.name,// userInfo: exportJson.info.name.creator,column: 10,row: 10,showinfobar: false,sheetFormulaBar: true,showConfigWindowResize: false};// 创建Luckysheetwindow.luckysheet.create(options);});}// 获取Excel文件中的最大行数const getMaxRowCountFromExcel = (workbook) => {let maxRowCount = 0;if (workbook.SheetNames == null || workbook.SheetNames.length === 0) {return maxRowCount;}// 遍历每个sheet，获取最大行数workbook.SheetNames.forEach(sheetName => {const worksheet = workbook.Sheets[sheetName];if (worksheet['!ref'] === undefined) {return;}const range = XLSX.utils.decode_range(worksheet['!ref']);maxRowCount = maxRowCount + range.e.r;});console.log("max:", maxRowCount)return maxRowCount;}const reduceBlankRow = (row, range, worksheet) => {// 从给定的行开始，向上遍历到工作表的起始行while (row > range.s.r) {// 假设当前行是空的let allEmpty = true;// 遍历当前行的所有列for (let col = range.s.c; col <= range.e.c; col++) {// 获取当前单元格的引用const cell_ref = XLSX.utils.encode_cell({c: col, r: row});// 如果当前单元格不为空，则将allEmpty设置为false并跳出循环if (worksheet[cell_ref]) {allEmpty = false;break;}}// 如果当前行是空的，则将行数减一，否则跳出循环if (allEmpty) {row--;} else {break;}}// 更新工作表范围的结束行range.e.r = row;// 更新工作表的范围引用worksheet['!ref'] = XLSX.utils.encode_range(range.s, range.e);}// 处理Excel文件中的空行const handleBlankRowForExcelWithTooManyBlankRow = (workbook) => {if (workbook.SheetNames == null || workbook.SheetNames.length === 0) {return;}// 遍历每个sheet，处理空行workbook.SheetNames.forEach(sheetName => {const worksheet = workbook.Sheets[sheetName];if (worksheet['!ref'] === undefined) {return;}const range = XLSX.utils.decode_range(worksheet['!ref']);let row = range.e.r;reduceBlankRow(row, range, worksheet);});}// 将Excel文件转换为xlsx类型const toXlsxExcelFile = (workbook, fileName) => {const newWorkbook = XLSX.write(workbook, {bookType: 'xlsx', type: 'binary'});const data = new Uint8Array(newWorkbook.length);for (let i = 0; i < newWorkbook.length; i++) {data[i] = newWorkbook.charCodeAt(i);}return new File([data], fileName, {type: _xlsxType});}// 文件上传控件的change事件处理函数document.getElementById('fileUpload').addEventListener('change', function (e) {// 获取上传的文件const file = e.target.files[0];// 处理Excel文件handleExcelFile(file);});</script></body>
</html>效果
参考
https://juejin.cn/post/7211805251216031801
https://segmentfault.com/a/1190000043720845
https://juejin.cn/post/7232524757525659708
https://blog.csdn.net/q2qwert/article/details/130908294
https://www.cnblogs.com/ajaemp/p/12880847.html
https://blog.csdn.net/weixin_40775791/article/details/135409716
https://blog.csdn.net/u013113491/article/details/129106671
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