How can I add an element to the SVG DOM

Question

I have a web page with a jpg image that the user draw an SVG doodle on top of using Raphael.

I want to allow the user to save a merged rasterised version of this when they are done (i will be doing something else with SVG version myself)

When the user clicks save I want to add that background image to the generated SVG DOM as an element and then use canvg to write the SVG to a canvas element. Finally I use the toDataUrl() method to turn that into a jpg.

I can't get the middle bit to work —what is the best way to add the image to the DOM? When i use the below code I get a javascript error that says appendChild() is not a function.

I am wondering if it has something to do with how I get the SVG using the .html() method —perhaps what ever is returned is not being interpreted as a real SVG document??

Any help much appreciated.

    function saveImage(){

        var img = document.getElementById('canvas').toDataURL("image/png");
        window.open(img,'Download');

    }

    $('#save').click(function(){

        var svg = $('#editor').html();

        // Create new SVG Image element.  Must also be careful with the namespaces.
        var svgimg = document.createElementNS("http://www.w3.org/2000/svg", "image");
        svgimg.setAttributeNS("http://www.w3.org/1999/xlink", 'xlink:href', "myimage.jpg");


        // Append image to SVG
        svg.appendChild(svgimg);

        canvg('canvas', svg, {renderCallback: saveImage(), ignoreMouse: true, ignoreAnimation: true, ignoreDimensions: true});

    });

Ram · Accepted Answer · 2016-02-04T16:06:36.853

35

Here is one way of doing it:

var svgimg = document.createElementNS('http://www.w3.org/2000/svg','image');
svgimg.setAttributeNS(null,'height','200');
svgimg.setAttributeNS(null,'width','200');
svgimg.setAttributeNS('http://www.w3.org/1999/xlink','href', 'myimage.jpg');
svgimg.setAttributeNS(null,'x','10');
svgimg.setAttributeNS(null,'y','10');
svgimg.setAttributeNS(null, 'visibility', 'visible');
$('svg').append(svgimg);

edited Feb 04 '16 at 16:06

answered Jun 02 '12 at 02:22

Ram

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doesn't work, image tag is appended but no network call is done, mid you I am not using jquery here, but native element – SuperUberDuper Jul 28 '20 at 10:11
@SuperUberDuper Vanilla Javascript also has the append function and it works similarly. https://gomakethings.com/how-to-convert-the-jquery-append-function-into-vanilla-js/ – Joshua Dance Jul 25 '22 at 22:32

How can I add an element to the SVG DOM

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