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Stompy · 07-13-2004, 09:51 AM

postbacks inform the server that an event took place.

for example, the code on a drop down menu will have a "__doPostBack" javascript attached to it on any of it's events (most common: onChange).

When the JS is called, the element's name is passed as an argument to a function which submits a form back to the server that triggers event handler code.

When the server is notified, that control's event handler fires.. so in your c# code, "cboBlah_OnChange" will fire. You can then add whatever code you need.

PostBacks, combined with ViewState, are awesome. Makes it very easy to change certain parts of your HTML without having to redraw the whole thing or execute unnecessary code.

It's kinda hard to explain, and it really didn't make much sense to me until I got very deep into user control creation. It's very handy.

07-13-2004, 09:51 AM	#4 (permalink)
Stompy Banned from being Banned Location: Donkey	postbacks inform the server that an event took place. for example, the code on a drop down menu will have a "__doPostBack" javascript attached to it on any of it's events (most common: onChange). When the JS is called, the element's name is passed as an argument to a function which submits a form back to the server that triggers event handler code. When the server is notified, that control's event handler fires.. so in your c# code, "cboBlah_OnChange" will fire. You can then add whatever code you need. PostBacks, combined with ViewState, are awesome. Makes it very easy to change certain parts of your HTML without having to redraw the whole thing or execute unnecessary code. It's kinda hard to explain, and it really didn't make much sense to me until I got very deep into user control creation. It's very handy. __________________ I love lamp. Last edited by Stompy; 07-13-2004 at 09:53 AM..