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Capture PDF inside iframe/object/embed #3187

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nishanth-cn opened this issue Aug 13, 2024 · 0 comments
Open

Capture PDF inside iframe/object/embed #3187

nishanth-cn opened this issue Aug 13, 2024 · 0 comments

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@nishanth-cn
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nishanth-cn commented Aug 13, 2024 •
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Hi ,
Thanks for the wonderful library.

I was just exploring it before using it for my project and i encountered a major issue.
Issue
Contents inside an <iframe> or object or embed doesn't capture if it is a pdf.

code

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>Using an existing canvas to draw on</title>
    <style>
        canvas {
            border: 1px solid grey;
        }
        button {
            display: block;
        }
        #text {
            background: cyan;
            padding: 5px 10px;
			line-height: 1em;
			display:	block;
        }
    </style>
</head>
<body>
<div><h1>Html2canvas</h1>
    <div `>`
		<span id="text">Normal text</span>
		
	</div>
	<object id="frame" data="kids.pdf"  width="100%" height="400px"></object>
	<!--<iframe id="frame" data="kids.pdf" ></iframe>-->

	<h3>Captured data</h3>
	<canvas id="textcapture" width="100%" height="200"></canvas>
	<canvas id="iframecapture" width="500" height="200"></canvas>
</div>

<script type="text/javascript" src="html2canvas.js"></script>
<button>Capture</button>
<script type="text/javascript">
    var textcanvas = document.querySelector("#textcapture");
	var framecanvas = document.querySelector("#iframecapture");
    
    document.querySelector("button").addEventListener("click", function() {
		html2canvas(document.querySelector("#text")	, {canvas: textcanvas, scale: 1}).then(function(canvas) {
            console.log('Text captured');
        });
        html2canvas(document.querySelector("#frame").contentDocument.body, {canvas: framecanvas, scale: 1,useCORS:true}).then(function(canvas) {
            console.log('Iframe captured');
        });
    }, false);

</script>
</body>
</html>

details
Span element in the main document is captured fine. However, <iframe> fails if content is a pdf, even if it is in same domain
I have tried multiple was to get the document inside <iframe>, but it always fails.
I have tried SetTimeout after looking at couple of other issue but it didn't solve the problem.

is there any way to fix this or is it a limitation of html2canvas even if documents are in same domain ?.
It would be helpful , if you suggest other libraries which have solution for this.

Specifications:

  • html2canvas version tested with: 1.4.1
  • Browser & version: Chrome 127.0.6533.100
  • Operating system: Windows 11
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