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Editorial Team
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Asked: 2026-05-12T22:12:43+00:00

I’ve been looking for a really easy/lightweight way to just be able to click

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I’ve been looking for a really easy/lightweight way to just be able to click thumbnails to switch the src of a larger image.

I haven’t actually tried it out yet. Is this the best solution?

The larger images to be swapped in will have the same width but a different height. Will this cause problems/is there something I need to add for this functionality? Would it be better to do a div with a background-image that swaps and is the height of the largest image?

Also, someone said that it only works once (??)… I’d need it to start out on a certain image, then be able to change to 2-4 other images on thumbnail click.

Thanks for any advice! I’m certainly (obviously) no Javascript writer.

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1 Answer

  1. Editorial Team

    You should be able to switch images as many times as you wish.

    The piece of code you reference replaces the image source of #target, with the href of a link within a #thumbs div. It should work fine.

    <img id="target" src="images/main.jpg">

<div id="thumbs">
<a href="images/picture1_big.jpg"><img src="images/picture1_small.jpg"></a>
<a href="images/picture2_big.jpg"><img src="images/picture2_small.jpg"></a>
<a href="images/picture3_big.jpg"><img src="images/picture3_small.jpg"></a>
</div>

    Now as far as width and height, I am pretty sure there are some cross-browser compatibility issues with how browsers handle a defined width, but an undefined height, when you swap out the images.

    In firefox, the following works. Plain old javascript, no jquery:

    <html>

   <head>

     <script type="text/javascript">
         function swap(image) {
             document.getElementById("main").src = image.href;
         }
     </script>

   </head>

   <body>

     <img id="main" src="images/main.jpg" width="50">

     <a href="images/picture1_big.jpg" onclick="swap(this); return false;"><img src="images/picture1_small.jpg"></a>
     <a href="images/picture2_big.jpg" onclick="swap(this); return false;"><img src="images/picture2_small.jpg"></a>
     <a href="images/picture3_big.jpg" onclick="swap(this); return false;"><img src="images/picture3_small.jpg"></a>

   </body>
</html>
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