Check Custom Number Format when Setting Style.Custom Property
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Possible Usage Scenarios
If you assign an invalid custom number format to Style.custom property, then Aspose.Cells for JavaScript via C++ will not throw any exception. But if you want Aspose.Cells to check if the assigned custom number format is valid or not, then please set the Workbook.settings.checkCustomNumberFormat property to true.
Check Custom Number Format when setting Style.custom property
The following sample code assigns an invalid custom number format to Style.custom property. Since we have already set the Workbook.settings.checkCustomNumberFormat property to true, it throws an exception, e.g., Invalid number format. Please read the comments inside the code for more help.
Sample Code
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Aspose.Cells Example - Check Custom Number Format</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');
let workbook;
if (fileInput.files.length) {
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
workbook = new Workbook(new Uint8Array(arrayBuffer));
} else {
// Create a new empty workbook if no file is provided
workbook = new Workbook();
}
// Setting this property to true will make Aspose.Cells throw an exception
// when invalid custom number format is assigned to Style.custom property
workbook.settings.checkCustomNumberFormat = true;
// Access first worksheet
const sheet = workbook.worksheets.get(0);
// Access cell A1 and put some number to it
const cell = sheet.cells.get("A1");
cell.value = 2347;
// Access cell's style and set its Style.custom property
const style = cell.style;
// This line will throw exception if workbook.settings.checkCustomNumberFormat is set to true
style.custom = "ggg @ fff"; // Invalid custom number format
// Saving the modified Excel file
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Operation completed. Click the download link to get the file.</p>';
});
</script>
</html>