Javascript doesn't see variable in ASP code

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I try to use

jquery.sumoselect.js

to get DropDownList with ComboBox on asp.net page. I put on the top of it

<script src="Scripts/jquery-3.6.0.js"></script>
<script src="Scripts/jquery.sumoselect.js"></script>
<link href="Content/sumoselect.css" rel="stylesheet" />

    <script type="text/javascript">
            $(document).ready(function () {
                $(<%=ddlMINERAL_ADD.ClientID%>).SumoSelect({ okCancelInMulti: true });
        });
    </script>

The page has table, asp.UpdatePanel, asp.repeater and the element

<asp:listbox ID="ddlMINERAL_ADD" runat="server"  selectionmode="Multiple">

is located deep inside the repeater.

I get error

Quote:
Compiler Error CS0103 - variable doesn't exist in this context

.If I move ddlMINERAL_ADD from the repeater - everything is ok.

What I have tried:

So I need "activate" several ddlMINERAL_ADD with javascript code on document.ready event.

Posted 22-Dec-22 8:58am

Member 1314182

Updated 22-Dec-22 9:21am

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raddevus · Answer 1 · 2022-12-22T09:21:00

We need to break apart the one line of code (shown next) and what occurs:

ASP.NET

$(<%=ddlMINERAL_ADD.ClientID%>)

The Razor engine things between <% and %> runs on the Server side.
The $() -- jQuery portion -- runs on the client side.

So, where does ddlMINERAL_ADD.ClientID actually have a value? Is it on the client (jquery / javascript side) or does that variable exist on the Server side (in C# code somewhere)?

If it exists in client code then that is why the Razor rendering engine cannot get the value (it runs on the server side before the client code runs).

I had a username that was on the server side, but I needed client-side javascript to have the value. I wrote up how to do that at this StackOverflow: https://stackoverflow.com/questions/4599169/using-razor-within-javascript/22175868#22175868[^]