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Can anyone explain this ASP script to me?

  • Vedette
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Post July 8th, 2004, 2:22 pm

I'm pretty sure what this script does, (preloads the images used for the current page), I just wanna make sure. And if someone could explain what the more complicated lines of code do exactly, that'd be great.


Code: [ Select ]
<script>
<!--
function newImage(arg) {
    if (document.images) {
        rslt = new Image();
        rslt.src = arg;
        return rslt;
    }
}
ImageArray = new Array;
var preloadFlag = false;
function preloadImages() {
    if (document.images) {

ImageArray[ImageArray.length++] = newImage(/* OWNER('object', 'dflt') *//*URL*/'images/main_htmlimage.jpg');        
ImageArray[ImageArray.length++] = newImage(/* OWNER('object', 'movr') *//*URL*/'images/main_htmlimageov.jpg');        

ImageArray[ImageArray.length++] = newImage(/* OWNER('object1', 'dflt') *//*URL*/'images/main_htmlimage1.jpg');        
ImageArray[ImageArray.length++] = newImage(/* OWNER('object1', 'movr') *//*URL*/'images/main_htmlimage1ov.jpg');        

ImageArray[ImageArray.length++] = newImage(/* OWNER('object2', 'dflt') *//*URL*/'images/main_htmlimage2.jpg');        
ImageArray[ImageArray.length++] = newImage(/* OWNER('object2', 'movr') *//*URL*/'images/main_htmlimage2ov.jpg');        

ImageArray[ImageArray.length++] = newImage(/* OWNER('object3', 'dflt') *//*URL*/'images/main_htmlimage3.jpg');        
ImageArray[ImageArray.length++] = newImage(/* OWNER('object3', 'movr') *//*URL*/'images/main_htmlimage3ov.jpg');        

ImageArray[ImageArray.length++] = newImage(/* OWNER('object4', 'dflt') *//*URL*/'images/main_htmlimage4.jpg');        
ImageArray[ImageArray.length++] = newImage(/* OWNER('object4', 'movr') *//*URL*/'images/main_htmlimage4ov.jpg');        

ImageArray[ImageArray.length++] = newImage(/* OWNER('object5', 'dflt') *//*URL*/'images/main_htmlimage5.jpg');        
ImageArray[ImageArray.length++] = newImage(/* OWNER('object5', 'movr') *//*URL*/'images/main_htmlimage5ov.jpg');        

ImageArray[ImageArray.length++] = newImage(/* OWNER('object6', 'dflt') *//*URL*/'images/main_htmlimage6.jpg');        
ImageArray[ImageArray.length++] = newImage(/* OWNER('object6', 'movr') *//*URL*/'images/main_htmlimage6ov.jpg');        

ImageArray[ImageArray.length++] = newImage(/* OWNER('object7', 'dflt') *//*URL*/'images/main_htmlimage7.jpg');        
ImageArray[ImageArray.length++] = newImage(/* OWNER('object7', 'movr') *//*URL*/'images/main_htmlimage7ov.jpg');        

        preloadFlag = true;
    }
}
function changeImages() {
    if (document.images && (preloadFlag == true)) {
        for (var i=0; i<changeImages.arguments.length; i+=2) {
            document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
        }
    }
}
// -->
</script>
  1. <script>
  2. <!--
  3. function newImage(arg) {
  4.     if (document.images) {
  5.         rslt = new Image();
  6.         rslt.src = arg;
  7.         return rslt;
  8.     }
  9. }
  10. ImageArray = new Array;
  11. var preloadFlag = false;
  12. function preloadImages() {
  13.     if (document.images) {
  15. ImageArray[ImageArray.length++] = newImage(/* OWNER('object', 'dflt') *//*URL*/'images/main_htmlimage.jpg');        
  16. ImageArray[ImageArray.length++] = newImage(/* OWNER('object', 'movr') *//*URL*/'images/main_htmlimageov.jpg');        
  18. ImageArray[ImageArray.length++] = newImage(/* OWNER('object1', 'dflt') *//*URL*/'images/main_htmlimage1.jpg');        
  19. ImageArray[ImageArray.length++] = newImage(/* OWNER('object1', 'movr') *//*URL*/'images/main_htmlimage1ov.jpg');        
  21. ImageArray[ImageArray.length++] = newImage(/* OWNER('object2', 'dflt') *//*URL*/'images/main_htmlimage2.jpg');        
  22. ImageArray[ImageArray.length++] = newImage(/* OWNER('object2', 'movr') *//*URL*/'images/main_htmlimage2ov.jpg');        
  24. ImageArray[ImageArray.length++] = newImage(/* OWNER('object3', 'dflt') *//*URL*/'images/main_htmlimage3.jpg');        
  25. ImageArray[ImageArray.length++] = newImage(/* OWNER('object3', 'movr') *//*URL*/'images/main_htmlimage3ov.jpg');        
  27. ImageArray[ImageArray.length++] = newImage(/* OWNER('object4', 'dflt') *//*URL*/'images/main_htmlimage4.jpg');        
  28. ImageArray[ImageArray.length++] = newImage(/* OWNER('object4', 'movr') *//*URL*/'images/main_htmlimage4ov.jpg');        
  30. ImageArray[ImageArray.length++] = newImage(/* OWNER('object5', 'dflt') *//*URL*/'images/main_htmlimage5.jpg');        
  31. ImageArray[ImageArray.length++] = newImage(/* OWNER('object5', 'movr') *//*URL*/'images/main_htmlimage5ov.jpg');        
  33. ImageArray[ImageArray.length++] = newImage(/* OWNER('object6', 'dflt') *//*URL*/'images/main_htmlimage6.jpg');        
  34. ImageArray[ImageArray.length++] = newImage(/* OWNER('object6', 'movr') *//*URL*/'images/main_htmlimage6ov.jpg');        
  36. ImageArray[ImageArray.length++] = newImage(/* OWNER('object7', 'dflt') *//*URL*/'images/main_htmlimage7.jpg');        
  37. ImageArray[ImageArray.length++] = newImage(/* OWNER('object7', 'movr') *//*URL*/'images/main_htmlimage7ov.jpg');        
  39.         preloadFlag = true;
  40.     }
  41. }
  42. function changeImages() {
  43.     if (document.images && (preloadFlag == true)) {
  44.         for (var i=0; i<changeImages.arguments.length; i+=2) {
  45.             document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
  46.         }
  47.     }
  48. }
  49. // -->
  50. </script>



thanks a lot in advance.
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Post July 8th, 2004, 2:22 pm

  • joebert
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Post July 8th, 2004, 8:39 pm

This is indeed a script for preloading images, However it isn't an ASP script.
ASP (Active Server Pages) put together data where it is being fetched from then send it to the browser.

As far as I know any script that uses document.anything is a client-side script (Javascript 999/1000 times).

This function will help better explain,
Quote:
function changeImages() {
if (document.images && (preloadFlag == true)) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
}
}
}


Note "document.images", "preloadFlag", & ".src"
preloadFlag holds true or false, if true then the browser has finished with processing the preloadFunction and can now set the ".src" (source/url) of the image objects.

As for the more complicated lines, well it's a little hard to know which ones are complicated to you.
If you can point out a certain line I or someone else will surely be able to explain it for you. :D
Strong with this one, the sudo is.
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Post July 8th, 2004, 8:42 pm

And while you are at it, there is most likely a counterpart to that script which will be the javascript that actually handles the rollovers. The two work hand in hand.
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