Getting Textbox value in Javascript

Question

I am trying to get the value of the textbox in a javascript, but its not working. Given below is the code of my test page

<%@ Page Title=\"\" Language=\"V         


        

Answer 1

Use

document.getElementById('<%= txt_model_code.ClientID %>')

instead of

document.getElementById('txt_model_code')`

Also you can use onClientClick instead of onClick.