Manage Legend of Excel Charts with JavaScript via C++
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Legend Options
Aspose.Cells for JavaScript via C++ also allows managing a chart’s legend at runtime. The Legend object can be moved, updated, and formatted.
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Setting the Legend of Chart
It’s simple to manage the legend of the chart with Aspose.Cells Legend.
The following code snippet demonstrates how to manage the legend:
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Aspose.Cells Chart Legend 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, ChartType, Color, LegendPositionType } = 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) {
// No file selected - a new workbook will be created
}
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();
}
// Adding a new worksheet to the Workbook object
const sheetIndex = workbook.worksheets.add();
// Obtaining the reference of the newly added worksheet by passing its sheet index
const worksheet = workbook.worksheets.get(sheetIndex);
// Adding sample values to cells
worksheet.cells.get("A1").putValue(50);
worksheet.cells.get("A2").putValue(100);
worksheet.cells.get("A3").putValue(150);
worksheet.cells.get("B1").putValue(60);
worksheet.cells.get("B2").putValue(32);
worksheet.cells.get("B3").putValue(50);
// Adding a chart to the worksheet
const chartIndex = worksheet.charts.add(ChartType.Column, 5, 0, 15, 5);
// Accessing the instance of the newly added chart
const chart = worksheet.charts.get(chartIndex);
// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.nSeries.add("A1:B3", true);
// Setting the title of a chart
chart.title.text = "Title";
// Setting the font color of the chart title to blue
chart.title.font.color = Color.Blue;
// Move the legend to left
chart.legend.position = LegendPositionType.Left;
// Set font color of the legend
chart.legend.font.color = Color.Blue;
// Saving the modified Excel file and providing 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 = 'chart_legend.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Chart with legend created successfully! Click the download link to get the workbook.</p>';
});
</script>
</html>