Reading ASP.NET text box value with JavaScript - Stack Overflow

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I am using a ASP.NET(3.5) page and I have a text box called txtName.

I want to read the value with JavaScript like so but it does not work.

var Name = document.getElementById(txtName).value;
alert(Name);

Even this does not want to work:

var Name = document.FormName.txtName.Value;
alert(Name);

This work with plain HTML pages but not with my ASP.NET page, why?

I am using a ASP.NET(3.5) page and I have a text box called txtName.

I want to read the value with JavaScript like so but it does not work.

var Name = document.getElementById(txtName).value;
alert(Name);

Even this does not want to work:

var Name = document.FormName.txtName.Value;
alert(Name);

This work with plain HTML pages but not with my ASP.NET page, why?

• javascript
• asp

Share Improve this question Follow edited Jul 22, 2010 at 8:30 abatishchev 100k8888 gold badges301301 silver badges442442 bronze badges asked Jul 21, 2010 at 11:18 EtienneEtienne 7,2014343 gold badges110110 silver badges163163 bronze badges

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2 Answers 2

Sorted by: Reset to default 8

It sounds like txtName is the server-side ID of your control. ASP.NET will use a different client-side ID when it renders the control as HTML: probably something like ctl00_Container_txtName.

You need to use the control's ClientID property to get the client-side ID, and then use that in your getElementById call:

var name = document.getElementById('<%=txtName.ClientID%>').value;

You'd better use the Jquery.then,juest call:

$('<%=txtName.ClientID%>').value;

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