Textbox value is undefined in jquery

Question

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Hello,
I want to get the value of a textbox in jquery and it shows undefined .

CODE

txtRule_No.Value = Request.QueryString["RuleNo"];

JQUERY

$("#txtRule_No").val()

this value in jquery is undefined . Can anyone help me on this .

What I have tried:

I tried with this $("#txtRule_No").val() , $("#txtRule_No").value() , $("#txtRule_No").html() ..

Posted 2-Nov-20 3:11am

Member 14362033

Updated 6-Dec-21 18:25pm

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Richard Deeming · Answer 1 · 2020-11-02T03:39:00

The most likely cause is that you're using a master page, which causes the IDs to be mangled.
Mastering Web Control ClientID Values in ASP.NET 4 - 4GuysFromRolla.com[^]

If there will only ever be a single instance of the control on the page, set ClientIDMode="Static" on your control.

If the script is embedded within the page, reference the control's ClientID property.

Otherwise, you'll need to find another way to reference the control.