Set Data source for the chart with JavaScript via C++
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In our previous topics, we have already provided many examples to demonstrate how you can set a data source for your chart but in this topic, we are going to provide more details about the types of data that can be set for a chart.
Setting Chart Data
There are two types of data to deal with while working on charts using Aspose.Cells as follows:
- Chart data.
- Category data.
Chart Data
Chart data is the data that we use as a data source to build our charts. We can add a range of the cells (containing chart data) by calling the SeriesCollection object’s add(string, boolean) method.
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Add Worksheet and 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 } = 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 () => {
// Instantiate a new Workbook
const workbook = new Workbook();
// Adding a new worksheet to the Excel 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").value = 50;
worksheet.cells.get("A2").value = 100;
worksheet.cells.get("A3").value = 170;
worksheet.cells.get("A4").value = 300;
worksheet.cells.get("B1").value = 160;
worksheet.cells.get("B2").value = 32;
worksheet.cells.get("B3").value = 50;
worksheet.cells.get("B4").value = 40;
// Adding sample values to cells as category data
worksheet.cells.get("C1").value = "Q1";
worksheet.cells.get("C2").value = "Q2";
worksheet.cells.get("C3").value = "Y1";
worksheet.cells.get("C4").value = "Y2";
// Adding a chart to the worksheet
const chartIndex = worksheet.charts.add(AsposeCells.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 "B4"
chart.nSeries.add("A1:B4", true);
// Saving the Excel file
const outputData = workbook.save(SaveFormat.Excel97To2003);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output.xls';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Workbook created successfully! Click the download link to get the file.</p>';
});
</script>
</html>
Category Data
Category data is used for the labeling of chart data and can be added to SeriesCollection by using its categoryData property. A complete example is given below to demonstrate the use of chart and category data. After executing the above example code, a column chart will be added to the worksheet as shown below.
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Aspose.Cells - Create Workbook with 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 } = 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');
// Instantiate or load workbook
let workbook;
if (fileInput.files.length) {
const arrayBuffer = await fileInput.files[0].arrayBuffer();
workbook = new Workbook(new Uint8Array(arrayBuffer));
} else {
workbook = new Workbook();
}
// Adding a new worksheet to the Excel 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(10);
worksheet.cells.get("A2").putValue(100);
worksheet.cells.get("A3").putValue(170);
worksheet.cells.get("A4").putValue(200);
worksheet.cells.get("B1").putValue(120);
worksheet.cells.get("B2").putValue(320);
worksheet.cells.get("B3").putValue(50);
worksheet.cells.get("B4").putValue(40);
// Adding sample values to cells as category data
worksheet.cells.get("C1").putValue("Q1");
worksheet.cells.get("C2").putValue("Q2");
worksheet.cells.get("C3").putValue("Y1");
worksheet.cells.get("C4").putValue("Y2");
// 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 "B4"
chart.nSeries.add("A1:B4", true);
// Setting the data source for the category data of SeriesCollection
chart.nSeries.categoryData = "C1:C4";
// Saving the Excel file and creating a download link
const outputData = workbook.save(SaveFormat.Excel97To2003);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output.xls';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Workbook created. Click the download link to save the file.</p>';
});
</script>
</html>