Добавление линии подписи на лист с помощью JavaScript и C++
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Введение
Aspose.Cells предоставляет свойство Picture.signatureLine для добавления строки подписи листа.
Как добавить строку подписи на рабочем листе
Следующий пример кода демонстрирует, как использовать свойство Picture.signatureLine для добавления линии подписи в лист. На снимке экрана показан эффект работы кода на пример файла Excel.
Образец кода
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example - Signature Line</title>
</head>
<body>
<h1>Signature Line Example</h1>
<p>Optional: select an existing Excel file to add the signature line to. Otherwise a new workbook will be created.</p>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<p>Select a PFX certificate file (required):</p>
<input type="file" id="certInput" accept=".pfx" />
<br/><br/>
<button id="runExample">Add Signature Line and Sign Workbook</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, SignatureLine, DigitalSignature, DigitalSignatureCollection } = 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');
const certInput = document.getElementById('certInput');
const resultDiv = document.getElementById('result');
if (!certInput.files.length) {
resultDiv.innerHTML = '<p style="color: red;">Please select a PFX certificate file.</p>';
return;
}
const certFile = certInput.files[0];
const certArrayBuffer = await certFile.arrayBuffer();
const certBytes = new Uint8Array(certArrayBuffer);
// Instantiate or load workbook
let workbook;
if (fileInput.files.length) {
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
workbook = new Workbook(new Uint8Array(arrayBuffer));
} else {
workbook = new Workbook();
}
// Create and configure signature line
const signatureLine = new SignatureLine();
signatureLine.signer = "Aspose.Cells";
signatureLine.title = "signed by Aspose.Cells";
// Access first worksheet and add signature line
const worksheet = workbook.worksheets.get(0);
worksheet.shapes.addSignatureLine(1, 1, signatureLine);
// Create digital signature from certificate bytes
const signature = new DigitalSignature(certBytes, "aspose", "test Microsoft Office signature line", new Date());
// Add signature to collection and assign to workbook
const dsCollection = new DigitalSignatureCollection();
dsCollection.add(signature);
workbook.digitalSignature = dsCollection;
// Save the workbook and provide 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 = 'signatureLine.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Signed Workbook';
resultDiv.innerHTML = '<p style="color: green;">Signature line added and workbook signed. Click the download link to get the file.</p>';
});
</script>
</html>