在使用C++中的JavaScript进行Excel转HTML时,排除未使用的样式
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可能的使用场景
Microsoft Excel文件可能包含许多未使用的样式。当将Excel文件导出为HTML格式时,这些未使用的样式也会被导出。这可能会增加HTML的大小。您可以在将Excel文件转换为HTML的过程中排除未使用的样式,方法是设置HtmlSaveOptions.excludeUnusedStyles属性。当将其设置为true时,所有未使用的样式将从输出的HTML中排除。以下截图显示了输出HTML中的一个未使用样式的示例。

在将 Excel 转换为 HTML 时排除未使用的样式
以下示例代码创建了一个工作簿,并且还创建了一个未使用的命名样式。由于将HtmlSaveOptions.excludeUnusedStyles设置为true,此未使用的命名样式不会导出到输出HTML。但如果将其设置为false,则此未使用的样式将存在于输出的HTML中,你可以在HTML标记中看到,如上方截图所示。
示例代码
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example - Exclude Unused Styles</title>
</head>
<body>
<h1>Exclude Unused Styles from Excel to HTML</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;"></a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, HtmlSaveOptions } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
if (fileInput.files.length > 0 && fileInput.files[0].size === 0) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select a valid Excel file.</p>';
return;
}
// Instantiate workbook from selected file or create a new one
let wb;
if (fileInput.files.length) {
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
wb = new Workbook(new Uint8Array(arrayBuffer));
} else {
wb = new Workbook();
}
// Create an unused named style
const style = wb.createStyle();
style.name = "UnusedStyle_XXXXXXXXXXXXXX";
// Access first worksheet
const ws = wb.worksheets.get(0);
// Put some value in cell C7
const cell = ws.cells.get("C7");
cell.value = "This is sample text.";
// Specify html save options, we want to exclude unused styles
const opts = new HtmlSaveOptions();
// Comment this line to include unused styles
opts.excludeUnusedStyles = true;
// Save the workbook in html format
const outputData = wb.save(SaveFormat.Html, opts);
const blob = new Blob([outputData], { type: "text/html" });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'outputExcludeUnusedStylesInExcelToHTML.html';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download HTML File';
document.getElementById('result').innerHTML = '<p style="color: green;">HTML generated successfully. Click the download link to get the result.</p>';
});
</script>
</html>