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postback does not preserve state of listbox that has been changed using javascript

Posted on 2006-07-19
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Last Modified: 2012-06-27
I have an aspx page with few web server ListBox, one of the listBox is empty. I have client side java script that populate the empty ListBox on a button click. Everything works fine.

Now when I do a postback via a LinkButton, I lose the data populated via the javascript. Anythoughts why this is happening and what should I do?
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Question by:pharosinnyc
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TimCottee earned 500 total points
ID: 17138958
Hi pharosinnyc,

Because the data that you populated client-side is not stored in the viewstate and therefore not available to the server-side code.

There is nothing that you can really do about this except use a work-around such as storing the populated data in a hidden form field with runat="server" perhaps as | delimited string and then parse this at the server side when you post back to deal with it accordingly.

Tim Cottee
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by:pharosinnyc
ID: 17139082
oh.. I suspected this.. exactly what I didnt want to hear.lol

Does this mean to take full advantage of postback we shouldnt use client side javascript? I am just starting to use .net

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by:Bob Learned
ID: 17139085
Yeah, or if you are working client-side, then stay client-side, since you can't mix the two without a bridge in between (hidden form field).

Bob
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by:pharosinnyc
ID: 17139112
k. Thanks Bob/Tim
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