Hi,
> Can anyone help?
Well, you haven't actually said what's wrong :-), but I'm guessing the
code is failing or you're not seeing the pixel get loaded or
something.
I think you probably meant "appendChild", rather than "append".
FWIW, if myTrackerDiv only ever contains this pixel, you could also do
this:
function getPixel() {
var div;
div = $('myTrackerDiv');
if (!div.firstChild) {
div.update("<img src='http://www.mysource.com/img/
trackingPixel.gif' />");
}
}
...which has the advantage of being brief and fairly clear. Perhaps
surprisingly, most browsers parse HTML and create elements internally
much faster than they create elements when you do it via their
external DOM interface. (Just be sure that the div starts out
completely empty, including no text nodes consisting of whitespace --
"<div id='myTrackerDiv'></div>", for instance, would be fine, but not
if the "</div>" part were on a separate line -- because then
div.firstChild would be a text node consisting of that newline. Or go
back to using an ID on the tracking pixel, if you prefer.)
HTH,
--
T.J. Crowder
tj / crowder software / com
Independent Software Engineer, consulting services available
On Jan 8, 3:05 pm, cstahl <[email protected]> wrote:
> I'm using prototype.js and writing a small script that will load a
> tracking pixel to a webpage when a download link is clicked. The page
> contains a div:
> <div id="myTrackerDiv"></div>
> which is where the tracking pixel will be loaded.
>
> My function is:
>
> function getPixel() {
> if(!$('trackingPixel')) {
> var thisPixel = new Element('img',
> {src:"http://www.mysource.com/img/
> trackingPixel.gif", id:"trackingPixel"});
> $('myTrackerDiv').append(thisPixel);
> }
> return false;}
>
> which looks for an existing trackingPixel ID and if it doesn't find
> it, it creates one.
>
> Can anyone help? I know I'm making some bonehead mistake but I'm kind
> of beat from banging my head in about this one.
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