External Javascript file fails to receive variables from previous javascript block
- by Franc
I've been searching the net for several hours and can't find an answer in the whole "external js file"-jungle. I hope you guys can help!
In short: My external javascript file doesn't seem to get the variables which I defined in the main.php file..
On main.php I define php variables and "transform" them into
javascript variables
<head>...
<script type="text/javascript">
var phpmain_img = <?php echo json_encode($main_img); ?>;
var phpvar1_large = <?php echo json_encode($var1_large); ?>;
var phpvar2_large = <?php echo json_encode($var2_large); ?>;
var phpvar3_large = <?php echo json_encode($var3_large); ?>;
var phpvar4_large = <?php echo json_encode($var4_large); ?>;
</script>
...
<script language="javascript" type="text/javascript" src="/wshop/ext.js"></script>
</head>
In my ext.js file I want to process those variables. In the
ext.js file I defined a the function swapImage() that will be used
back in the main PHP:
var imgArray = new Array(
phpmain_img,
phpvar1_large,
phpvar2_large,
phpvar3_large
);
function swapImage(imgID) {
var theImage = document.getElementById('theImage');
var newImg;
newImg = imgArray[imgID];
theImage.src = newImg;
}
function preloadImages() {
for(var i = 0; i < imgArray.length; i++) {
var tmpImg = new Image;
tmpImg.src = imgArray[i];
}
}
Result: The swapImage() in the main.php... doesnt work
<div id="image">
<img id="theImage" src="<?=$main_img; ?>" alt="" />
</div>
<div id="thumbs">
<?php
echo "<img src=\"<$main_img_small\" alt=\"\" onmouseover=\"swapImage(0);\">";
echo "<img src=\"$var1_small\" alt=\"\" onmouseover=\"swapImage(1);\">";
echo "<img src=\"$var2_small\" alt=\"\" onmouseover=\"swapImage(2);\">";
echo "<img src=\"$var3_small\" alt=\"\" onmouseover=\"swapImage(3);\">";
?>
<br />
</div>
Any help is greatly appreciated!
UPDATE:
I don't get a specific error, the swapImage functions doesn't work at mouseover. However, I tried to output the variables with e.g. document.write(phpimg_main) but nothing appears which makes me believe that there's something wrong with the handing over of the variables...
here's the source code browser output
`<html>
<head>
<link href="../demo.css" rel="stylesheet" type="text/css" />
<style type="text/css">
....
</style>
<script type="text/javascript">
var phpmain_img = {"0":"http:\/\/path\/to\/main\/image.jpg"};
var phpvar1_large = {"0":"http:\/\/path\/to\/image1.jpg"};
var phpvar2_large = {"0":"http:\/\/path\/to\/image2.jpg"};
var phpvar3_large = null;
var phpvar4_large = null;
</script>
<script language="javascript" type="text/javascript" src="/wshop/ext.js"></script>
</head>
<body onload="preloadImages()">
<div id="image">
<img id="theImage" src="http://path-to-main-image.jpg" alt="" />
</div>
<div id="thumbs">
<img src="http://path-to-main-image.jpg" alt="" onmouseover="swapImage(0);"><img src="http://path-to-image1.jpg" alt="" onmouseover="swapImage(1);"><img src="http://path-to-image2.jpg" alt="" onmouseover="swapImage(2);">
<br />
</div>
</body>
`
