用JavaScript通过C++从模板文件加载工作簿时筛选数据类型
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有时，你希望在用模板文件构建工作簿时指定加载哪种类型的数据。筛选已加载的数据可以提高特殊用途的性能，尤其是在使用LightCells API时。请使用LoadOptions.loadFilter属性实现此目的。
以下示例代码仅在加载工作簿时加载形状对象，工作簿来自给定链接中的 模板文件。下图显示了 模板文件 的内容，并说明因为设置了 LoadOptions.loadFilter 属性为 Shape ，所以红色和黄色背景的数据不会被加载。
下面的屏幕截图显示了您可以从给定链接下载的输出PDF。在这里，您可以看到红色和黄色背景中的数据不存在，但所有形状都在那里。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Aspose.Cells 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, LoadOptions, LoadFormat, LoadFilter, LoadDataFilterOptions, 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();
// Set the load options, we only want to load shapes and do not want to load data
const loadOptions = new LoadOptions(LoadFormat.Xlsx);
loadOptions.loadFilter = new LoadFilter(LoadDataFilterOptions.All & ~LoadDataFilterOptions.Chart);
// Create workbook object from uploaded excel file using load options
const workbook = new Workbook(new Uint8Array(arrayBuffer), loadOptions);
// Save the output in pdf format
const outputData = workbook.save(SaveFormat.Pdf);
const blob = new Blob([outputData], { type: 'application/pdf' });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'sampleFilterChars_out.pdf';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Result PDF';
document.getElementById('result').innerHTML = '<p style="color: green;">Operation completed successfully! Click the download link to get the PDF file.</p>';
});
</script>
</html>