Suivi de la progression de la conversion du document avec JavaScript via C++
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Scénarios d’utilisation possibles
Parfois, la conversion de gros fichiers Excel peut prendre du temps. Pendant ce temps, vous pourriez vouloir afficher la progression de la conversion du document au lieu d’un simple écran de chargement pour améliorer l’utilisabilité de votre application. Aspose.Cells for JavaScript via C++ supporte le suivi du processus de conversion du document en fournissant l’interface IPageSavingCallback. L’interface IPageSavingCallback fournit les méthodes IPageSavingCallback.pageStartSaving(PageStartSavingArgs) et IPageSavingCallback.pageEndSaving(PageEndSavingArgs) que vous pouvez implémenter dans votre classe personnalisée. Vous pouvez également contrôler les pages qui sont rendues, comme démontré dans la classe personnalisée TestPageSavingCallback.
Suivre la progression de la conversion des documents
L’exemple de code suivant charge le fichier Excel source et affiche sa progression de conversion dans la console en utilisant la classe personnalisée TestPageSavingCallback qui implémente l’interface IPageSavingCallback.
Code d’exemple
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Pages to PDF with Progress Callback</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, PdfSaveOptions, SaveFormat } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
// Define TestPageSavingCallback class
class TestPageSavingCallback {
onPageSaving(pageIndex, fileName) {
console.log(`Saving page ${pageIndex} to ${fileName}`);
}
}
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
const resultDiv = document.getElementById('result');
resultDiv.innerHTML = '';
if (!fileInput.files.length) {
resultDiv.innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Instantiate Workbook from uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Create PdfSaveOptions and assign the page saving callback
const pdfSaveOptions = new PdfSaveOptions();
pdfSaveOptions.pageSavingCallback = new TestPageSavingCallback();
// Save workbook as PDF with options
const outputData = workbook.save(SaveFormat.Pdf, pdfSaveOptions);
const blob = new Blob([outputData], { type: "application/pdf" });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'DocumentConversionProgress.pdf';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download PDF File';
resultDiv.innerHTML = '<p style="color: green;">PDF conversion started/completed. Click the download link to get the PDF file.</p>';
});
</script>
</html>
Le code pour la classe personnalisée TestPageSavingCallback.
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Page Saving Callback Example</title>
</head>
<body>
<h1>Page Saving Callback Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Run Example (Save as PDF with Callback)</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, PdfSaveOptions, Utils } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
class TestPageSavingCallback {
pageStartSaving(args) {
console.log(`Start saving page index ${args.pageIndex} of pages ${args.pageCount}`);
// don't output pages before page index 2.
if (args.pageIndex < 2) {
args.isToOutput = false;
}
}
pageEndSaving(args) {
console.log(`End saving page index ${args.pageIndex} of pages ${args.pageCount}`);
// don't output pages after page index 8.
if (args.pageIndex >= 8) {
args.hasMorePages = false;
}
}
}
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));
// Create PDF save options and attach the page saving callback
const options = new PdfSaveOptions();
options.pageSavingCallback = new TestPageSavingCallback();
// Save workbook as PDF with the callback applied
const outputData = workbook.save(SaveFormat.Pdf, options);
const blob = new Blob([outputData], { type: 'application/pdf' });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output.pdf';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download PDF File';
document.getElementById('result').innerHTML = '<p style="color: green;">PDF generated successfully! Click the download link to get the file.</p>';
});
</script>
</html>
Sortie console
Start saving page index 0 of pages 11</br>
End saving page index 0 of pages 11</br>
Start saving page index 1 of pages 11</br>
End saving page index 1 of pages 11</br>
Start saving page index 2 of pages 11</br>
End saving page index 2 of pages 11</br>
Start saving page index 3 of pages 11</br>
End saving page index 3 of pages 11</br>
Start saving page index 4 of pages 11</br>
End saving page index 4 of pages 11</br>
Start saving page index 5 of pages 11</br>
End saving page index 5 of pages 11</br>
Start saving page index 6 of pages 11</br>
End saving page index 6 of pages 11</br>
Start saving page index 7 of pages 11</br>
End saving page index 7 of pages 11</br>
Start saving page index 8 of pages 11</br>
End saving page index 8 of pages 11