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Postback causing <BODY OnUnload="..."> to fire

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jmikow

jmikow

Programmer
Mar 27, 2003
114
US
I have some Javascript that executes when the page is closed by clicking the "X" in the browser. It is tied to the <BODY OnUnload="..."> event.

I have noticed that when I click a button on the page that causes a postback and runs server-side code that it triggers the "OnUnload" event of the BODY tag.

Is there any way in the Javascript to detect if the BODY unload is because of a postback or because the window is closing?

Any ideas or suggestions are welcome!

Thanks,

Josh
 
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You can see from the example that the hidden form values can be hard to track. I have two button, I clicked butAdd.

__EVENTTARGET=
__EVENTARGUMENT=
ctrl_adm_clients1:butAdd= Add Client
ctrl_adm_clients1:drpCounselors=

It would be better to put this in your form.
<form runat=server onsubmit="JavaScriptVarIsPostBack=true;return true;">
 
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RTomes,

I'm fairly new to ASP.Net and haven't gotten too deep other than what VS provides.

Would I set the value of a hidden textbox and then check that value to determine if it is a postback or window close? I've tried this a bit and haven't been able to get it to be accurate.

Thanks for the tip. I didn't realize I could do javascript on form submit. I'm going to work with that also.

Thanks,

Josh
 
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What is was showing above was to use the onsubmit. Trying to query all the form elements is a daunting task. Use onSubmit().


<head>
<script>
var IsPostBack=false
function CheckIt(){
if(IsPostBack){
//Do what ever you want it is a post back....
}else{
//Do what you want if it is not....
}//end if
}
</script>
</head>
<body onunload=CheckIt() >

<form runat=server onsubmit="IsPostBack=true;return true;">
 
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RTomes,

I was able to get it to work using the OnSubmit() event since that fires before the OnUnload() event.

I set the variable in the OnSubmit and check its value in the OnUnload. Depending on the value I decide what to do when the page is unloaded.

Thanks for the tip and example!

Josh
 
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