Problems in JavaScript/ASP.NET

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I am new in ASP and developing an web application that requires user to register to the system. In registration.aspx, I have ASP controls.

My problem is to access the ASP controls using JavaScript. Suppose for validating a text input i need to write something like this:

JavaScript

document.getElementbyId("myControl").value="Something";

But for ASP controls I don't get such attributes (like value, selectedindex etc.). If I put these codes into C# that requires post back pages while executing code. So, as a use I never expect pages to post back every while I make changes to any of the controls in pages.

I tried to use ClientID property as suggested by MSDN. But ClientID property is only available at ASP.NET 4 but not in ASP.NET 3.5.

I am using ASP.NET 3.5. How can I do these things. Can you please help me out? Thanks in advance.

Posted 30-Dec-11 14:36pm

Jyoti Choudhury

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virang_21 · Answer 1 · 2011-12-30T16:09:00

Solution 1

You can use ClientID property. One thing you can do is check your rendered page's source and see the control's ID generated by ASP.NET and the one appearing in your javascript function are the same.

C#

document.getElementById('<%= myControl.ClientID %>').value="something";

Posted 30-Dec-11 16:09pm

virang_21

koolprasad2003 · Answer 2 · 2011-12-30T18:18:00

Have you give "runat=server" property to your controls ? if not then give it.
try out simple script

XML

<script language="JavaScript">
   function CallMe()
     {
          alert("Yes..first POP up from javascript");
          return false;
     }
 </script>
 </head>
 <body> Welcome to javascript example!
        <input type="submit" id="sub1" runat="server" onclick="return CallMe();">
 </body>