使用SheetJs实现在线预览Excel（保留单元格格式信息）
一、寻找合适的在线预览Excel的js库
经过百度各种搜索，加上ChatGpt推荐，决定用SheetJs实现在线预览Excel。下面是SheetJs的官网介绍：
SheetJS
电子表格简化
读取、编辑和导出电子表格
适用于网络浏览器和服务器
Office 365 受到 Microsoft 信任
SheetJS 软件为业务提供动力
谷歌、亚马逊、Facebook 服务
美国政府网站
超过 90% 的标准普尔 500 强公司的团队
二、基础版实现代码
<script> (async() => { /* replace with the URL of the file */ const URL_TO_DOWNLOAD = "https://sheetjs.com/pres.numbers"; const ab = await (await fetch(URL_TO_DOWNLOAD)).arrayBuffer(); /* Parse file and get first worksheet */ const wb = XLSX.read(ab); const wsname = wb.SheetNames[0]; const ws = wb.Sheets[wsname]; /* Generate HTML */ var output = document.getElementById("TableContainer"); output.innerHTML = XLSX.utils.sheet_to_html(ws); })(); </script>
三、增强版实现代码，支持单元格格式等
由于基础实现丢失了很多关键格式信息，比如字体大小、背景色、对齐方式、批注等。于是请教ChatGpt帮忙写代码。下面是ChatGpt写出来的代码，正确与否待验证
<!DOCTYPE html>
<html>
<head>
<title>Excel Online Preview</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.16.9/xlsx.full.min.js"></script>
<style>
/* 根据需要设置单元格样式 */
.cell {
padding: 5px;
border: 1px solid #ccc;
font-family: Arial, sans-serif;
}
</style>
</head>
<body>
<button id="loadExcelButton">加载Excel</button>
<div id="excelPreview"></div>
<script>
document.getElementById('loadExcelButton').addEventListener('click', function() {
fetchExcelData();
});
function fetchExcelData() {
fetch('URL_OF_YOUR_BACKEND_API')
.then(response => response.arrayBuffer())
.then(data => {
var workbook = XLSX.read(new Uint8Array(data), { type: 'array' });
var sheetName = workbook.SheetNames[0];
var sheet = workbook.Sheets[sheetName];
var cellData = XLSX.utils.sheet_to_json(sheet, { header: 1 });
var htmlTable = '<table>';
for (var row = 0; row < cellData.length; row++) {
htmlTable += '<tr>';
for (var col = 0; col < cellData[row].length; col++) {
var cellValue = cellData[row][col];
var cellRef = XLSX.utils.encode_cell({ r: row, c: col });
var cell = sheet[cellRef];
var cellStyle = cell ? cell.s : {};
var cellStyleAttr = 'style="' + getCellStyle(cellStyle) + '"';
var mergeAttr = getMergeAttributes(sheet, row, col);
var comment = getCellComment(cell);
var cellHtml = '<td class="cell" ' + cellStyleAttr + ' ' + mergeAttr + '" title="' + comment + '">' + cellValue + '</td>';
htmlTable += cellHtml;
}
htmlTable += '</tr>';
}
htmlTable += '</table>';
document.getElementById('excelPreview').innerHTML = htmlTable;
})
.catch(error => {
console.error('Error fetching Excel data:', error);
});
}
function getCellStyle(cellStyle) {
var styleAttr = '';
if (cellStyle.font) {
var font = cellStyle.font;
if (font.bold) styleAttr += 'font-weight:bold;';
if (font.italic) styleAttr += 'font-style:italic;';
if (font.underline) styleAttr += 'text-decoration:underline;';
if (font.strike) styleAttr += 'text-decoration:line-through;';
if (font.color) styleAttr += 'color:' + font.color.rgb + ';';
if (font.name) styleAttr += 'font-family:' + font.name + ';';
}
if (cellStyle.alignment) {
var alignment = cellStyle.alignment;
if (alignment.horizontal) styleAttr += 'text-align:' + alignment.horizontal + ';';
if (alignment.vertical) styleAttr += 'vertical-align:' + alignment.vertical + ';';
}
if (cellStyle.fill) {
var fill = cellStyle.fill;
if (fill.patternType === 'solid' && fill.fgColor) {
styleAttr += 'background-color:' + fill.fgColor.rgb + ';';
}
}
return styleAttr;
}
function getMergeAttributes(sheet, row, col) {
var mergeCells = sheet['!merges'] || [];
for (var i = 0; i < mergeCells.length; i++) {
var mergeRange = XLSX.utils.decode_range(mergeCells[i]);
if (row >= mergeRange.s.r && row <= mergeRange.e.r && col >= mergeRange.s.c && col <= mergeRange.e.c) {
return 'rowspan="' + (mergeRange.e.r - mergeRange.s.r + 1) + '" colspan="' + (mergeRange.e.c - mergeRange.s.c + 1) + '"';
}
}
return '';
}
function getCellComment(cell) {
if (cell && cell.c) {
var comment = cell.c[0].t;
return comment;
}
return '';
}
</script>
</body>
</html>
图片展示
发现一个代码高亮转成图片的网站：
https://10015.io/tools/code-to-image-converter?utm_source=appinn.com