How to Export A Chart.js Chart As an Image Or PDF?

12 minutes read

To export a Chart.js chart as an image or PDF, you can use the plugin called "chartjs-plugin-datalabels" which provides the functionality to export the chart. First, you need to include the plugin in your HTML file along with the Chart.js library.


Next, you need to instantiate the plugin in your Chart.js configuration options and specify the type of file you want to export – either an image or PDF. The plugin will then generate a download link for the file.


To export the chart as an image, you can use the Canvas.toDataURL() method to convert the chart canvas into a Base64 encoded image. This image can then be downloaded by the user using the link generated by the plugin.


Similarly, to export the chart as a PDF, you can use a library like jsPDF to create a PDF document and draw the chart canvas onto it. You can then provide a download link for the PDF file.


Overall, using the "chartjs-plugin-datalabels" plugin along with Canvas and jsPDF provides a simple and effective way to export Chart.js charts as images or PDFs.

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How to export a Chart.js chart as an image?

To export a Chart.js chart as an image, you can use the Chart.js plugin called 'Chartjs-plugin-datalabels' along with a library called 'canvas-toBlob'. Here's how you can do it:

  1. First, add the 'Chartjs-plugin-datalabels' plugin to your Chart.js chart. You can include it in your HTML file like this:
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<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels"></script>


  1. Next, you will need to include the 'canvas-toBlob' library in your HTML file. You can include it like this:
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<script src="https://cdnjs.cloudflare.com/ajax/libs/canvas-toBlob/4.1.0/canvas-toBlob.min.js"></script>


  1. Then, after you've created your Chart.js chart, you can add a button or trigger element to trigger the image export. For example:
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<button id="exportChart">Export Chart</button>


  1. Now, add JavaScript code to handle the export functionality. This code will capture the chart canvas, convert it to a Blob, and then provide a way to download the image. Here's an example:
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document.getElementById('exportChart').addEventListener('click', () => {
  const chartCanvas = document.getElementById('myChart');
  
  // Convert canvas to Blob
  chartCanvas.toBlob((blob) => {
    const url = URL.createObjectURL(blob);
    
    // Create a link element and trigger the download
    const link = document.createElement('a');
    link.href = url;
    link.download = 'chart.png';
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
  });
});


Replace 'myChart' with the ID of your Chart.js chart canvas. When you click on the 'Export Chart' button, it will generate a PNG image of your chart and download it.


Note that this method may not work in all browsers, especially in older versions. You may need to check for browser compatibility and make adjustments accordingly.


How to include labels and titles in an exported Chart.js chart as an image or PDF?

When exporting a Chart.js chart as an image or PDF, labels and titles can be included by using the canvas toDataURL method or using a third-party library like html2pdf or dom-to-image.


Here's a simple example using the canvas toDataURL method to export a Chart.js chart with labels and titles:

  1. Add labels and titles to your Chart.js chart:
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const chart = new Chart(ctx, {
   type: 'bar',
   data: {
       labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
       datasets: [{
           label: 'Sales',
           data: [65, 59, 80, 81, 56, 55, 40],
           backgroundColor: 'blue'
       }]
   },
   options: {
       title: {
           display: true,
           text: 'Monthly Sales Report'
       }
   }
});


  1. Export the chart as an image or PDF:
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// Get the chart canvas element
const canvas = document.getElementById('myChart');

// Convert the canvas to a data URL
const url = canvas.toDataURL('image/png');

// Create a new image element and set the data URL as the src attribute
const img = new Image();
img.src = url;

// Optionally, create a new PDF document and add the image as a page
// Example using jsPDF library
const pdf = new jsPDF();
pdf.addImage(img, 'PNG', 10, 10, 100, 100);
pdf.save('chart.pdf');


By following these steps, you can include labels and titles in an exported Chart.js chart as an image or PDF.


What are some tools that can help with exporting a Chart.js chart as an image or PDF?

  1. html2canvas: A JavaScript library that can capture any HTML element and render it as an image, which can then be saved as a file format like PNG or JPEG.
  2. Chart.js-plugin-datalabels: This plugin allows for displaying labels on the chart (e.g. data values or labels) which can then be included in the exported image or PDF.
  3. Canvas2Image: A JavaScript library that can convert a canvas element to an image file (PNG or JPEG) that can be saved locally.
  4. jsPDF: A JavaScript library that can generate PDF files based on HTML content, which can include Chart.js charts.
  5. Chart.js-to-image: A library specifically designed for converting Chart.js charts to images, with support for various file formats and customization options.
  6. Chart.js-utils: A set of utilities for Chart.js that includes functions for exporting charts as images or PDF files.


By using these tools and libraries, you can easily export your Chart.js chart as an image or PDF file for sharing or saving purposes.


What file format should I use to export a Chart.js chart as an image?

You can export a Chart.js chart as an image in various file formats such as PNG, JPEG, or PDF. The most common and widely supported file format for exporting charts as images is PNG. You can use the toDataURL() method in Chart.js to convert the chart canvas into a PNG image and then save it as a downloadable file.


What is the best software to use for exporting a Chart.js chart as an image or PDF?

One popular software that can be used to export a Chart.js chart as an image or PDF is the Chart.js plugin called "chartjs-plugin-datalabels". This plugin allows you to export charts as images or PDF files with the help of the toBlob() method provided by the HTML canvas element.


Alternatively, you can also use third-party libraries like html2canvas or jsPDF to convert Chart.js charts into images or PDFs. These libraries provide more advanced export options and customization features for your exported charts.


Overall, the best software to use for exporting a Chart.js chart as an image or PDF will depend on your specific requirements and the level of customization you need for your exported charts. It is recommended to explore different options and choose the software that best fits your needs.


How to share an exported Chart.js chart with others?

  1. Save the exported Chart.js chart as an image file:
  • Before exporting the chart, make sure to check if the export feature is enabled in your Chart.js configuration.
  • Export the chart as an image file (e.g., PNG or JPEG) by clicking on the export button on the chart or using the Chart.js API to programmatically export the chart as an image.
  1. Share the image file via email or messaging apps:
  • Once you have saved the chart as an image file, you can easily share it with others by attaching the image file to an email or sending it via messaging apps like WhatsApp or Slack.
  1. Share the chart online:
  • Upload the exported chart image to a file-sharing platform like Google Drive, Dropbox, or Imgur and share the link with others.
  1. Embed the chart in a document or presentation:
  • You can also embed the exported chart image in a document (e.g., Word document or PDF) or presentation (e.g., PowerPoint or Google Slides) to share it with others.
  1. Share the code and data used to create the chart:
  • If the recipients are familiar with Chart.js or programming, you can share the code and data used to create the chart so that they can recreate it on their own system. You can share the code via email, GitHub, or other code-sharing platforms.


By following these steps, you can easily share an exported Chart.js chart with others.

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