How to create Treemap chart with JavaScript via C++
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Possible Usage Scenarios
A Treemap chart provides a hierarchical view of your data and makes it easy to spot patterns, such as which items are a store’s best sellers. The tree branches are represented by rectangles, and each sub‑branch is shown as a smaller rectangle. The Treemap chart displays categories by color and proximity, and it can easily show large amounts of data that would be difficult to represent with other chart types.
Treemap chart
After running the code below, you will see the Treemap chart as shown below.
Sample Code
The following sample code loads the sample Excel file and generates the output Excel file.
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Treemap Chart Example</title>
</head>
<body>
<h1>Treemap Chart 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, FillType } = 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 Workbook with uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Access the first worksheet
const worksheet = workbook.worksheets.get(0);
// Add a Treemap chart at row 5, column 6 with height 20 and width 12
const treemapIdx = worksheet.charts.add(ChartType.Treemap, 5, 6, 20, 12);
// Retrieve the Chart object
const chart = worksheet.charts.get(treemapIdx);
// Set the legend to be shown
chart.showLegend = true;
// Set the chart title text
chart.title.text = "Treemap Chart";
// Add series data range (D2:F13)
chart.nSeries.add("D2:F13", true);
// Set category data (A2:C13)
chart.nSeries.setCategoryData("A2:C13");
// Show the DataLabels with category names for the first series
chart.nSeries.get(0).dataLabels.showCategoryName = true;
// Fill the PlotArea with nothing
chart.plotArea.area.fillFormat.fillType = FillType.None;
// Save the modified Excel file 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 = 'out.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Treemap chart created successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>