How to ensure html2canvas.js properly converts SVG image tags into images?

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When using html2canvas.js to convert an HTML element with SVG tags into an image, a particular issue arises with SVG image tags, such as

<image y="2" transform="translate(0,0)" height="28" width="28" x="28" xlink:href="/content/adv/Control/2.png" display="block"></image>

This problem appears to be specific to the SVG image tag, as other elements convert successfully. Is there a requirement for unique handling or techniques to ensure that SVG image tags are correctly rendered by html2canvas?

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Hey Reena! Welcome back to our community.

Here is the solution for you situation, when you use html2canvas.js to convert an HTML element containing SVG tags into an image, you may encounter specific challenges with SVG image tags. To ensure that these SVG image tags are correctly rendered, you can employ some unique techniques and handling methods.

Here are the steps that you can follow to address the issues related to SVG image tags in html2canvas:

  1. Verify External Resource Loading: One common issue with SVG image tags is related to the loading of external resources. Confirm that the image specified in the xlink:href attribute can be accessed and is loading correctly.
    If the image is hosted on a different domain, you may encounter CORS (Cross-Origin Resource Sharing) restrictions. To mitigate this, ensure that the image server supports CORS or consider converting the image into a Base64-encoded data URI and using it in the xlink:href attribute to avoid cross-origin issues.

  2. Proper SVG Namespace: Make sure that the SVG image tag is in the correct SVG namespace, which should be http://www.w3.org/2000/svg. If necessary, you can explicitly set the namespace using JavaScript.

  3. Wait for Image to Load: If the SVG image is loaded dynamically, such as through JavaScript, ensure that you wait for the image to load completely before attempting to capture the HTML element using html2canvas. You can achieve this by utilizing the onload event of the Image object to ensure that the image is ready for rendering.

  4. Check Element Visibility: Confirm that the SVG image element is visible when you capture the HTML element with html2canvas. If the element is hidden or not rendered at the time of capture, it won’t be included in the resulting image.

  5. Utilize Promises: html2canvas typically returns a promise when capturing elements. You can effectively handle the captured image by using the then method of the promise. This ensures that you wait for the capture to complete and then manage the resulting canvas or image.

By following these steps and employing these techniques, you can address the challenges associated with SVG image tags and ensure their correct rendering when using html2canvas.js to convert an HTML element containing SVG content into an image.

I hope this may help you. Do let us know if you have further questions.

Thank you