javascript - How to find a asp control id using java script? - Stack Overflow

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I am using following code to find control id.

alert(document.getElementById("<%# TextBox1.ClientId %>").value )

but this code is giving error "object required". Please help me.

I am using following code to find control id.

alert(document.getElementById("<%# TextBox1.ClientId %>").value )

but this code is giving error "object required". Please help me.

• javascript
• asp

Share Improve this question Follow asked May 16, 2012 at 12:09 user1369925user1369925 5522 gold badges44 silver badges1212 bronze badges 1

• 1 Do you have a control with that name...? – gdoron Commented May 16, 2012 at 12:10

Add a ment  | 

5 Answers 5

Sorted by: Reset to default 3

You need to use '=', not '#'

alert(document.getElementById("<%= TextBox1.ClientId %>").value );

The "<%#" symbol is an inline expression used for databinding.

The "<%=" symbol there is used for display / translation purposes. It basically does a Response.Write of just the value of the .ClientID property of your server control.

See this article on inline expressions in asp for more info.

replace # with = in the given statement updated statement is

  alert(document.getElementById("<%= TextBox1.ClientId %>").value);

Either use

alert(document.getElementById("<%= TextBox1.ClientId %>").value )

or set ClientIDMode="Static" for textbox and then

alert(document.getElementById("<%= TextBox1 %>").value )

Also check How to: Access Controls from JavaScript by ID

alert(document.getElementById('Id of control').value )

You can get the exact id of control by view source.

In the context of JavaScript, which is on the client side "<%# TextBox1.ClientId %>" has no meaning because this will be translated by ASP into to a different ID based on how you configure TextBox1.ClientIDMode for which you have 4 modes described here Control.ClientIDMode

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