How To Convert HTML Code Or Data Containing (image Tag And Some Text) Into Image For Download

I want to render some Html code as an image to download for my website. I am using html2canvas that is working fine to create image for text but I want to create image from html di

Solution 1:

Use rasterizeHTML.js:

From the example:

<canvas id="canvas" width="400" height="200"></canvas>
<script type="text/javascript">
    var canvas = document.getElementById("canvas");

    rasterizeHTML.drawHTML(
        '<div><h1>HTML content to render:</h1>' + 
        '    <div id="content">' + 
        '        <img src="./images/127597554.jpg" height="200" width="200">' + 
        '        Hello <strong>visiting</strong> guest' + 
        '    </div>' + 
        '</div>',
        canvas);
</script>

Or just:

rasterizeHTML.drawURL("http://example.net", canvas);

To download the image use canvas2image (with a hidden canvas):

Canvas2Image.saveAsPNG(canvas, width, height);

The major advantages of doing the rendering on the client are that the html can be user specific and the server does not have to render the image.

Solution 2:

You can embed the html in a svg to render it at the canvas, e.g.

html:

<canvas id="canvas" style="border:2px solid black;" width="160" height="43"></canvas>

js:

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

var data = '<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200">' +
            '<foreignObject width="100%" height="100%">' +
            '<div xmlns="http://www.w3.org/1999/xhtml" style="font-size:40px">' +
                '<em>I</em> like ' +
                '<span style="color:white; text-shadow:0 0 2px blue;">' +
                'SO</span>' +
            '</div>' +
            '</foreignObject>' +
            '</svg>';

var DOMURL = window.URL || window.webkitURL || window;

var img = new Image();
var svg = new Blob([data], { type: 'image/svg+xml;charset=utf-8' });
var url = DOMURL.createObjectURL(svg);

img.onload = function () {
    ctx.drawImage(img, 0, 0);
    DOMURL.revokeObjectURL(url);
}

img.src = url;

fiddle: https://jsfiddle.net/qkvu7fmL/

I couldn't find a reference to the original source of this example- if somebody knows- please add credits as comments.