Joe Joe - 1 month ago 8
HTML Question

Modify SVG fill color when being served as Background-Image

Placing the SVG output directly inline with the page code I am able to simply modify fill colors with CSS like so:

polygon.mystar {
fill: blue;
}‚Äč

circle.mycircle {
fill: green;
}


This works great, however I'm looking for a way to modify the "fill" attribute of an SVG when it's being served as a BACKGROUND-IMAGE.

html {
background-image: url(../img/bg.svg);
}


How can I change the colors now? Is it even possible?

For reference, here are the contents of my external SVG file:

<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
width="320px" height="100px" viewBox="0 0 320 100" enable-background="new 0 0 320 100" xml:space="preserve">
<polygon class="mystar" fill="#3CB54A" points="134.973,14.204 143.295,31.066 161.903,33.77 148.438,46.896 151.617,65.43 134.973,56.679
118.329,65.43 121.507,46.896 108.042,33.77 126.65,31.066 "/>
<circle class="mycircle" fill="#ED1F24" cx="202.028" cy="58.342" r="12.26"/>
</svg>

Answer

I think the only way for you to do this is to serve your svg from some server side mechanism. Simply create a resource server side that outputs your svg according to GET parameters, and you serve it on a certain url.

Then you just use that url in your css.

Because as a background img, it isn't part of the DOM and you can't manipulate it. Another possibility would be to use it regularly, embed it in a page in a normal way, but position it absolutely, make it full width & height of a page and then use z-index css property to put it behind all the other DOM elements on a page.