On error dont scream

[Andreex]

Is there something like on error resume next in javascript?
Or.. is there a way to make sure an object exists? Like... if exists (btnSumbit){}......??

Thanks

[The Hobo]

Not to my knowledge, no. But I don't know much about JS error handling.

[Andreex]

what about the second question??? Is there a way to know if a certain object exists before trying to do somethign with it?

[msimmons]

Originally posted by Andreex
what about the second question??? Is there a way to know if a certain object exists before trying to do somethign with it?

if (element){
alert('it exists');
}

I'll get back to you on the other in a sec.

[msimmons]

function stopErrors() {
return true;
}
window.onerror = stopErrors;

I think this is what you are looking for and exactly what I used it for as well... I had a problem with an element not being there in time so occasionaly would get the yellow triangle in the corner. I learned to ignore it but the users were freaked out. This is supposed to stop it. I don't think it does if you have your browser to give the pop up error though... can't remember.

hope that helps,
Michael

[Andreex]

nice... Thanks... This will do the trick....

[Andreex]

hey.. I did the if (element){
alert('it exists');
and it sent me an error saying the element didnt exist... why?

[msimmons]

Dont know if it will make a difference but in my code I have:

function loadPropertyInfoPage(){
	if (!parent.frames[2].document.all.HotelID){
		parent.frames[2].location.href = "propertyinfo.asp";
		setTimeout("loadPropertyInfoPage()",1000); 
	} else {
                                getPassword();
	}
		
}

[Andreex]

nope.. it doesnt work... isnt there a function or anything? That would be weird, dont you think?

[msimmons]

I don't understand what you mean. Its odd that it works for me though cos what I just posted is exactly what I have.
Michael

[Andreex]

well.. maybe I am misunderstanding.. or you are... but here is what I need..

Lets say... txtName is an object that does exist in the page and that... txtLastName is an object that doesnt exists... so
if I put...

if (txtLastName)
{
alert("it does exists")
}
else
{
alert("it does not exists")
}

but.. it sends me an error in the if line....

[msimmons]

yeah. thats what I use it for as well. Is that your code exactly? I think it should be:
if (document.txtLastName)

[Andreex]

there! It worked with the document. as the prefix!
THANKS

[msimmons]

lol... no problem, sorry I didn't think of that sooner.
Michael

[Rick Bull]

I think that onerror thing may be IE only, not sure though. I think you can also use try...catch statements, I haven't tried though but I think they're used something like this:

try {
  //The code goes here
}
catch (e) {
  alert(e);
}

Or if you want to be selective:

catch (e if e == "ERROR_DESCRIPTION") {
}

[msimmons]

Originally posted by Rick Bull
I think that onerror thing may be IE only, not sure though.

That is very possible. Most of my apps are IE only (as far as I know) as I was able to tell my clients what to do if they wanted to be a client but I am slowly starting to try my hardest to become compliant.

Michael

[Rick Bull]

Good boy It's not really that hard anyway, it's just that it's easy to pick up IE only habbits from other people.