使用JavaScript via C++获取工作表中的最大范围
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在从工作表读取数据时，我们需要知道最大的区域。
在从工作表复制所有数据时，我们需要知道最大的区域。
在导出指定区域为HTML和PDF时，我们需要知道最大区域。
Aspose.Cells for JavaScript via C++ 提供了多种查找工作表最大区域的方法。
获取最大范围
在Aspose.Cells中，如果初始化了row和column对象，这些行和列将被计入最大区域，即使空行或空列没有数据。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Example Title</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, Worksheet, Cell } = 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();
// Loads the workbook from the uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Get all the worksheets in the book.
const worksheets = workbook.worksheets;
const sheet = worksheets.get(0);
// Gets the max data range.
let maxRow = sheet.cells.maxRow;
let maxColumn = sheet.cells.maxColumn;
// The range is A1:B3 (based on maxRow/maxColumn).
let range = sheet.cells.createRange(0, 0, maxRow + 1, maxColumn + 1);
// Clear cell A10
const cell = sheet.cells.get("A10");
cell.value = null;
// Recalculate maxRow/maxColumn after clearing
maxRow = sheet.cells.maxRow;
maxColumn = sheet.cells.maxColumn;
// The range is updated (e.g., A1:B10).
range = sheet.cells.createRange(0, 0, maxRow + 1, maxColumn + 1);
// Save the modified workbook and provide a 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 = 'output.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Operation completed successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>
获取最大数据范围
在大多数情况下，我们只需要获取包含所有数据的所有范围，即使范围外的空单元格被格式化。 以及有关形状、表格和数据透视表的设置将被忽略。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Example Title</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 } = 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();
// Instantiate a new Workbook from uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Get all the worksheets in the book.
const worksheets = workbook.worksheets;
const sheet = worksheets.get(0);
// Gets the max data range.
let maxRow = sheet.cells.maxDataRow;
let maxColumn = sheet.cells.maxDataColumn;
// The range is A1:B3 (based on maxRow/maxColumn).
let range = sheet.cells.createRange(0, 0, maxRow + 1, maxColumn + 1);
// Clear cell A10 by setting its value to null
const cell = sheet.cells.get("A10");
cell.value = null;
// Recalculate max data range after clearing the cell
maxRow = sheet.cells.maxDataRow;
maxColumn = sheet.cells.maxDataColumn;
// The range is still A1:B3 (after clearing A10).
range = sheet.cells.createRange(0, 0, maxRow + 1, maxColumn + 1);
// Save the modified workbook and provide a 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 = 'output.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Operation completed successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>
获取最大显示范围
当我们将工作表中的所有数据导出到 HTML、PDF 或图像时，需要获取一个包含所有可见对象的区域，包括数据、样式、图形、表格和数据透视表。 以下代码演示如何将最大显示范围渲染为HTML：
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Aspose.Cells Example - Export Range to HTML</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 } = 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();
// Instantiate a new Workbook from the uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Get all the worksheets in the book.
const worksheets = workbook.worksheets;
// Gets the max display range.
const range = worksheets.get(0).cells.maxDisplayRange;
// Save the range to html
const saveOptions = new AsposeCells.HtmlSaveOptions();
saveOptions.exportActiveWorksheetOnly = true;
saveOptions.exportArea = AsposeCells.CellArea.createCellArea(
range.firstRow,
range.firstColumn,
range.firstRow + range.rowCount - 1,
range.firstColumn + range.columnCount - 1
);
// Save the range to HTML format and provide download link
const outputData = workbook.save(SaveFormat.Html, saveOptions);
const blob = new Blob([outputData], { type: 'text/html' });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'html.html';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download HTML File';
document.getElementById('result').innerHTML = '<p style="color: green;">Range exported successfully! Click the download link to get the HTML file.</p>';
});
</script>
</html>
这是 源 Excel 文件。