使用JavaScript通过C++更新Power Query公式项。
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使用场景
可能存在数据源文件被移动且Excel文件无法找到文件的情况。在这种情况下，Aspose.Cells API提供了通过PowerQueryFormulaItem类更新源文件位置的选项。
更新Power Query公式项
Aspose.Cells API 提供了更新 Power Query 公式项的能力。下面的代码片段演示了如何使用 PowerQueryFormulaItem.value 属性在 Excel 文件中更新数据源文件位置。附带的源文件和输出文件供参考。
示例代码
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Power Query Formula Update Example</h1>
<p>Select the workbook containing Power Query formulas and an optional source workbook to reference in the "Source" item.</p>
<input type="file" id="fileInputMain" accept=".xls,.xlsx,.csv" />
<br/><br/>
<label for="fileInputSource">Optional source file (used in the Power Query "Source" item):</label>
<input type="file" id="fileInputSource" accept=".xls,.xlsx,.csv" />
<br/><br/>
<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 } = 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 result = document.getElementById('result');
const fileInputMain = document.getElementById('fileInputMain');
if (!fileInputMain.files.length) {
result.innerHTML = '<p style="color: red;">Please select the main Excel file containing Power Query formulas.</p>';
return;
}
const fileMain = fileInputMain.files[0];
const arrayBuffer = await fileMain.arrayBuffer();
// Instantiating a Workbook object by loading the uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Accessing the mashup data and power query formulas
const mashupData = workbook.dataMashup;
const powerQueryFormulas = mashupData.powerQueryFormulas;
const count = powerQueryFormulas.count;
for (let i = 0; i < count; i++) {
const formula = powerQueryFormulas.get(i);
const items = formula.powerQueryFormulaItems;
const itemsCount = items.count;
for (let j = 0; j < itemsCount; j++) {
const item = items.get(j);
if (item.name === "Source") {
const sourceFileInput = document.getElementById('fileInputSource');
const sourceFile = sourceFileInput.files.length ? sourceFileInput.files[0] : null;
const sourceName = sourceFile ? sourceFile.name : "SamplePowerQueryFormulaSource.xlsx";
// Update the Source item's value to reference the selected source file name
item.value = `Excel.Workbook(File.Contents("${sourceName}"), null, true)`;
}
}
}
// Saving the modified workbook and preparing download link
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
const outputFileName = fileMain.name.replace(/\.[^/.]+$/, '') + '_out.xlsx';
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = outputFileName;
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
result.innerHTML = '<p style="color: green;">Power Query formulas updated successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>