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Modifying controls client-side Messages   Related Types This message was discovered on ASPFriends.com 'aspngclient' list. David Turner I have two listboxes on a form. Client side, I'm allowing the user to move elements back and forth from each listbox. I'm using javascript that uses the document.createElement, and the options collection of each listbox to add and remove options. Problem is that when I post back, the items collection of each of these controls does not reflect the options that were added or removed client-side. Any thoughts on why this is. To work around this, I'm doing a post-back every time they select to move options, but this seams like a lot of overhead just to move an item from one listbox to another. Reply to this message...        Matthew Tamm my thoughts on this are....although your adding/removing elements on the client, when you postback, the controls contents are being re-created from the viewstate, not the form's contents....Not too sure on a way around this one, besides doing the postback. ----- Original Message ----- From: David Turner To: aspngclient Sent: Friday, August 09, 2002 12:28 PM Subject: [aspngclient] Modifying controls client-side I have two listboxes on a form. Client side, I'm allowing the user to move elements back and forth from each listbox. I'm using javascript that uses the document.createElement, and the options collection of each listbox to add and remove options. Problem is that when I post back, the items collection of each of these controls does not reflect the options that were added or removed client-side. Any thoughts on why this is. To work around this, I'm doing a post-back every time they select to move options, but this seams like a lot of overhead just to move an item from one listbox to another. Reply to this message...        Andy Smith this is a limitation of the html select element. It does not postback to the server its entire list, only it's selected item. In order for this to work the way you want, you should probably create a subclass of ListBox that stores its clientside item changes in hidden var(s) which is then loaded in a rewrite of LoadPostBackData. __ Andy Smith Keyboard Jockey #3a7-2.78.1 -----Original Message----- From: Matthew Tamm [mailto:Click here to reveal e-mail address] Sent: Friday, August 09, 2002 11:49 AM To: aspngclient Subject: [aspngclient] Re: Modifying controls client-side my thoughts on this are....although your adding/removing elements on the client, when you postback, the controls contents are being re-created from the viewstate, not the form's contents....Not too sure on a way around this one, besides doing the postback. ----- Original Message ----- From: David <mailto:Click here to reveal e-mail address> Turner To: aspngclient <mailto:Click here to reveal e-mail address> Sent: Friday, August 09, 2002 12:28 PM Subject: [aspngclient] Modifying controls client-side I have two listboxes on a form. Client side, I'm allowing the user to move elements back and forth from each listbox. I'm using javascript that uses the document.createElement, and the options collection of each listbox to add and remove options. Problem is that when I post back, the items collection of each of these controls does not reflect the options that were added or removed client-side. Any thoughts on why this is. To work around this, I'm doing a post-back every time they select to move options, but this seams like a lot of overhead just to move an item from one listbox to another. | [aspngclient] member Click here to reveal e-mail address = YOUR ID | http://www.aspfriends.com/aspfriends/aspngclient.asp = JOIN/QUIT Reply to this message...     System.Web.UI.WebControls.ListBox System.Windows.Forms.ListBox Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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