Javascript: Clicking thumbnails to switch a larger image. Best method?

问题

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.

This is what I've found: http://snipplr.com/view/8688/jquery-image-swap/

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.

回答1:

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>

回答2:

This example eliminates loading time after clicking on thumbnails:

HTML:

<div id="big-image">
    <img src="http://lorempixel.com/400/200/sports/1/">
    <img src="http://lorempixel.com/400/200/fashion/1/">
    <img src="http://lorempixel.com/400/200/city/1/">
</div>

<div class="small-images">
    <img src="http://lorempixel.com/100/50/sports/1/">
    <img src="http://lorempixel.com/100/50/fashion/1/">
    <img src="http://lorempixel.com/100/50/city/1/">
</div>

Javascript:

$(function(){
    $("#big-image img:eq(0)").nextAll().hide();
    $(".small-images img").click(function(e){
        var index = $(this).index();
        $("#big-image img").eq(index).show().siblings().hide();
    });
});

http://jsfiddle.net/Qhdaz/2/

来源：https://stackoverflow.com/questions/1640727/javascript-clicking-thumbnails-to-switch-a-larger-image-best-method

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