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How to get selected listbox item and copy it to a text box control using Java Script.

Posted on 2011-03-08
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Last Modified: 2012-05-11
I have an Asp.net listbox on a web form. Below that is a text box control. When I select an item from the listbox, I would like Java Script to take the selected text in the listbox and then copy it into the text box control. Can someone show me how to do this?

I am using Asp.net with C#, however I need to use Java Script to prevent postback flash. Ajax is not an option right now. Only Java Script. Can someone help me out?
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Question by:brgdotnet
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4 Comments
 
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Expert Comment

by:Nathan Bove
ID: 35072760
Just an FYI, this really isn't an ASP.NET question, it is a javascript question and you would probably get better results if you posted in the correct area.  That being said, I think you can accomplish what you want with the following code:

<asp:ListBox ID="MyListBox" runat="server" onchange="ListBoxChanged(this);">
<asp:ListItem Text="1" Value="1" />
<asp:ListItem Text="2" Value="2" />
</asp:ListBox>
<asp:TextBox ID="MyTextBox" runat="server">
<script type="text/javascript">
  function ListBoxChanged(listBox) {
    document.getElementById('<%= MyTextBox.ClientID %>').value = listBox.items[listBox.selectedIndex].text;
  }
</script>
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Author Comment

by:brgdotnet
ID: 35074439
Hi nbove. I can't get your code to work. Your code does not work.

I have been working with various Java Script and can't get it to work with Asp.net listboxes. I think with Asp.net the listbox working with Java Script is different then just your typical listbox control. So I think the question should remain in Asp.net since the Java Script needs to work with the listbox control.
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Accepted Solution

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Nathan Bove earned 520 total points
ID: 35075093
I tested and the code works.  Give me a bit more information other than "Your code does not work." and I might be able to help you.
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Author Closing Comment

by:brgdotnet
ID: 35137577
Thanks Champ!
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