[thelist] Javascript problem - trying to "wait"

Tom Dell'Aringa pixelmech at yahoo.com
Mon Jul 15 12:58:22 CDT 2002


Yeah, this is just a re-wording of what I already tried that gives me
the endless loop..
--- Amazon Paulo <Amazon.Paulo at Amazoniacelular.com.br> wrote:
> Hi Tom,
>
> What about trying to use the object until it exists?
>
> function viewerTest(){
>    while
>
(!parent.frames["graphicView"].document.getElementById("va_3d_vml_viewer")){
> 	// just waiting
>    }
>    return true;
> }
>
> I'm not sure if this is the best way to do that, tho... (in fact I
> don't
> believe it is ;))
>
> /Paulo Guedes
>
> -----Original Message-----
> From: Tom Dell'Aringa [mailto:pixelmech at yahoo.com]
> Sent: Monday, July 15, 2002 1:36 PM
> To: thelist at lists.evolt.org
> Subject: [thelist] Javascript problem - trying to "wait"
>
>
> Hi All,
>
> I've got a tricky javascript issue. I have action B happening on
> page
> load in an init() function. In order for B to happen, A must be
> loaded first (to avoid a object required error). I have been
> experimenting with setInterval() to accomplish this. I have the
> problem KIND OF solved, but as our CAD developer said, its a bad
> solution. Here is some code:
>
> Function 1: Test to see if object has loaded
> ----------------------------------------------
> function viewerTest()
> {
>
>
if(parent.frames["graphicView"].document.getElementById("va_3d_vml_viewer"))
>    {
>       clearInterval(checkViewer);
>       return true;
>    }
>    return false;
> }
> ----------------------------------------------
>
> So when this function is called it either returns TRUE or FALSE,
> depending on if the viewer is there. makes sense. Here's the other
> part, inside the init() function:
>
> ----------------------------------------------
>
> // wait for viewer to be there
>
> checkViewer = setInterval("viewerTest()", 50);
>
> while(!viewerTest())
>    {
>       checkViewer;  //waiting for the viewer to continue.
>    }
> ----------------------------------------------
>
> Now, this seems to work, but here's the issue - its an overload on
> server resources (which in the app I am working on is a BIG issue.)
>
> I set the interval to the var checkViewer. This means the interval
> starts checking the viewerTest() function every 50 milliseconds
> until
> it finds it and is cleared there.
>
> But, during my "wait" part in the while loop, I am ALSO checking
> against viewerTest(), and during the while loop the check is
> CONSTANT
> until it finds it. This is duplicating the process seemingly.
>
> Lastly, I call the variable checkViewer (the interval) inside the
> while loop. Why? If I don't, its an endless loop error. Crash.
> We've
> tried merely using the while loop, checking against the
> viewerTest()
> function. You would think that would work, but often we get an
> endless loop crash.
>
> This is a real stinker, any input is appreciated.
>
> Tom
>
>
>
> =====
> var me = tom.pixelmech.webDeveloper();
> http://www.pixelmech.com/
>
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=====
var me = tom.pixelmech.webDeveloper();
http://www.pixelmech.com/

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