jquery preloaded imgages with rollovers

StackOverflow https://stackoverflow.com/questions/20485392

Question

So I am doing something very basic that can be done with CSS but I want to do it with jQuery to get familiar with the library.

I am trying to create a rollover image gallery. Where when you put the mouse over the image it will be swapped with a slightly edited version of it.

Here is the code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>jQuery</title>
<script src="jquery-1.9.1.js"></script>
<style>

</style>
</head>
<body>
<div id="gallery">
    <a href="#"><img src="images/one_s.jpg" /></a>
    <a href="#"><img src="images/two_s.jpg" /></a>
    <a href="#"><img src="images/three_s.jpg" /></a>
    <a href="#"><img src="images/four_s.jpg" /></a>
    <a href="#"><img src="images/five_s.jpg" /></a>
    <a href="#"><img src="images/six_s.jpg" /></a>
</div>
<script>
$(document).ready(function(){

    var alternate = ['images/one_s_edited.jpg',
                    'images/two_s_edited.jpg',
                    'images/three_s_edited.jpg',
                    'images/four_s_edited.jpg',
                    'images/five_s_edited.jpg',
                    'images/six_s_edited.jpg'];

    var $selection = $("#gallery img");

    for(var i = 0; i < alternate.length; i++)
    {

        var imgObject = new Image();

        var downloadedImg = imgObject.src = alternate[i];

        console.log(downloadedImg);

        var originalSrc = $selection.eq(i).attr("src");

        console.log(originalSrc + "\n");

        $selection.eq(i).hover(
            function(){
                $(this).attr("src", downloadedImg);
            },
            function(){
                $(this).attr("src", originalSrc);
            }
        );//End hover

    }//End loop
});//End ready
</script>
</body>
</html>

Here is a link to the final result: link

As you can see it rolls over but not as planned. It ends up with the last rollover-image and doesn't change back to the original nor does it show the appropriate rollover image that corresponds with it.

Any simple suggestions without using regular expressions?

Était-ce utile?

La solution

The problem is the wrong usage of a closure variable in a loop.

But the solution can be simplified to

$(document).ready(function () {
    var $selection = $("#gallery img");
    $selection.hover(function () {
        this.src = this.src.replace('.jpg', '_edited.jpg')
    }, function () {
        this.src = this.src.replace('_edited.jpg', '.jpg')
    })
}); //End ready
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