How to resolve client id value of ASP.NET control getting changed in javascript? ?

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I am having issue while passing the client id value of asp.net control getting changed in JavaScript. I am getting exception while passing the value of a dropdown (ctl00_cphDDS_drdInstructionCode) as updated below.
In one server it is rendering as ctl00_cphDDS_drdInstructionCode but in another server it is rendering as cphDDS_drdInstructionCode. Application is running in asp.net with 4.6.2 framework. I want to resolve this issue globally. Sample code is updated below.

What I have tried:

Code is as below:

JavaScript

var DropdownList = document.getElementById("ctl00_cphDDS_drdInstructionCode");
var SelectedIndex = DropdownList.selectedIndex;
var SelectedValue = DropdownList.options[DropdownList.selectedIndex].value;
var txtComments = document.getElementById("ctl00_cphDDS_txtUserComments").value;

Posted 24-Jan-24 20:55pm

Member 7513082

Updated 25-Jan-24 3:28am

Andre Oosthuizen

v4

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M Imran Ansari · Answer 1 · 2024-01-25T16:26:00

You can use the ClientIDMode="Static" attribute on the control (DropDownList), which ensures that the client ID remains the same as the server ID.

ASP.NET

<asp:DropDownList runat="server" ID="drdInstructionCode" ClientIDMode="Static">
    <!-- Your rest of code -->
</asp:DropDownList>

This approach should help you avoid issues related to varying client IDs in different server environments. Also see the link to explore this feature
https://www.codeproject.com/Articles/34151/ASP-NET-4-0-Client-ID-Feature