css - how to change image source by its id?
Does anyone know how can I control the image source from the CSS?
I need to be able to change the image src from the CSS. I have loop printing < img id=.. > tags, and for every id it different image. I want to be able to set the source by it开发者_开发技巧s id from the style css area.
Does anyone know how to do this?
This is not possible: The image's source is part of the markup, not CSS.
The only workaround would be having div elements with background-image properties instead. Those you could set from within the style sheet:
<div id="image1"></div>
#image1 { width: 100px; height: 50px; background-image: url(image.gif); }
However, with this method you lose all the img tag's advantages like
- The ability to set an
alttext - Resizing
- Printing (most browsers don't print background images)
- Search engine indexing (probably)
the only other alternative is by using JavaScript, but that obviously won't work if JavaScript is disabled, which makes it a no-no in my view.
This is now possible with CSS3 using the Content style. I use this to swap images within a slider based on window size through media queries.
Edit: When I originally posted this, I was unaware that it only worked in Webkit at the moment. But I doubt it will take long before it gains more functionality across browsers.
HTML
<img class="img1" src="image.jpg">
CSS
@media (min-width: 768px) {
.img1 {
content: url(image.jpg);
}
}
@media (max-width: 767px){
.img1 {
content: url(new-image.jpg);
}
}
That is not possible with CSS. However, this is very easy with Javascript:
document.getElementById("IdOfImage").src = "SourceOfImage";
You cannot really do that, however, if you do need to do that using CSS, you can do it for two images with the same size like this:
<style>
img {
width:0;
height:0;
display:block;
background: url('2.png') no-repeat bottom left;
padding-left:196px;
padding-bottom:187px;
}
</style>
<img src="1.png">
Only tested it in FF3.6 though.
I found this article that might be useful. It actually changes background of an image
here is the example in case website goes missing:
HTML
<html>
<body>
<div class="header">
<img class="banner" src="http://notrealdomain1.com/banner.png">
</div>
</body>
</html>
CSS
/* All in one selector */
.banner {
display: block;
-moz-box-sizing: border-box;
box-sizing: border-box;
background: url(http://notrealdomain2.com/newbanner.png) no-repeat;
width: 180px; /* Width of new image */
height: 236px; /* Height of new image */
padding-left: 180px; /* Equal to width of new image */
}
If you don't want to use backgrounds nor use javascript, you layer 2 images with different src on top of each other (using absolute positioning) and use CSS to hide one or another. Visually it will be the same then changing the src.
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