Remove Unused Styles inside the Workbook with JavaScript via C++
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Unused styles in Excel files not only take up space but also cause performance issues while converting to different formats like PDF, HTML, etc. Aspose.Cells provides the Workbook.removeUnusedStyles() to remove all the unused styles inside the workbook.
The following code explains the usage of Workbook.removeUnusedStyles(). The code loads the template excel file which you can download from the provided link. It contains an unused style named AsposeStyle; this style and all other unused styles will be removed after the execution of the code.
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example - Remove Unused Styles</title>
</head>
<body>
<h1>Remove Unused Styles Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, Utils } = 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) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Instantiating a Workbook object from the uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Remove all unused styles inside the workbook
workbook.removeUnusedStyles();
// Save the modified workbook as XLSX and provide a download link
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output_out.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Unused styles removed successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>