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Making a selection from an AJAX dropdown extender appear in a textbox inside a repeater in ASP.NET / Javascript

I'm trying to make an AJAX dropdownextender selection (from a list box) that is inside a repeater control, populate the relative text box when a selection is made.

<asp:TextBox ID="tbSeparator" Text=<%#Eval("Separator")%> runat="server" Wrap="False" Width="176" Font-Names="Verdana" ForeColor="#666666"></asp:TextBox>
   <cc1:DropDownExtender ID="ddeSeparator" DropDownControlID="lbSeparator"
        runat="server" DynamicServicePath="" Enabled="True" TargetControlID="tbSeparator"
        <asp:ListBox ID="lbSeparator" runat="server"
        CssClass="alwaysontop" OnTextChanged="UpdateSeparator" Height="85px">

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How do I do this?

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8/22/2022 - Mon
jitendra patil

try the below link code it displays the correct usage of dropdown extender
AJAX Control Toolkit Dropdown Extender Tutorial ASP.NET C#

here's another one
How to use DropDownExtender in asp.net ajax

hope this helps.

Thanks. I'm able to utilize the dropdown extender, no problem. It's when it's inside a repeater is when I'm running into problems. Also, your links show how to make this happen in the code behind. Per my title, I'm trying to do this on the client side. Thanks again.
jitendra patil

can you share your javascript code here?
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James Murphy

<script type="text/javascript">
    function closest(ele, className) {
        do {
            ele = ele.parentNode;
            if (ele.className !== undefined && ele.className.indexOf(className) > -1) {
                return ele;
        } while (ele.className !== undefined);
        return null;
    	window.popit = function popit(ele) {
        var de = closest(ele.parentElement, 'entrye');
	de.getElementById("tbSeparator").innerHTML = this.options[this.selectedIndex].text;

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This is one of may variations I've been trying

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jitendra patil

glad to know you got the solution,
sorry for the delay,  couldn't get back to you.

Figured it out
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