How do I access the DOM objects using javascript.

[Steve Kershaw]

I have a problem in that I need to access the value (text) in an
asp:textbox using javascript. Is there any way to do this or am I all
wet? Do I have to use VBScript to access asp: objects?

Thanks in advance for your help!

Steve

 

[Steve C. Orr [MVP, MCSD]]

It's standard HTML by the time the browser gets it, so you can use standard
JavaScript (Or VBScript in IE) to access the DOM just as you would for any
web page.

Here's more info:
http://SteveOrr.net/articles/ClientSideSuite.aspx

 

[Steve Kershaw]

I checked out the code you referenced and it all looks like server side
code to me. None of it is javascript. I need to run a javascript
"function" that collects the .text from the asp: textbox. But the
javascript dosen't recognize the asp:textbox as an HTML object.

Hmm....
Thanks

Steve

 

[Steve Kershaw]

In experimenting around I find that:

<input type="text" name="mytext" > will work if I use javascript
document.aspnetForm.mytext.value = "Hi there";

However when the textbox is an asp: like:

<asp:TextBox ID="TextBox1" runat="server">My text 2</asp:TextBox> will
NOT WORK
with javascript: window.document.aspnetForm.TextBox1.Text = "Hi
again!";

It gives me an error message that states:
"window.document.aspnetForm.TextBox1 is null or not an object"

 

[Vlad Iliescu]

You should view the source in IE and see what id is assigned to that
textbox. Each control is given a client-side unique id, based on its
server-side id and the ids of its container controls.

For example a server-side textbox with the id of DataSetNameTextBox is
outputted as
<input
name="ctl00$ContentPlaceHolder1$fvwNormsDataSet$DataSetNameTextBox"
type="text" value="" maxlength="50"
id="ctl00_ContentPlaceHolder1_fvwNormsDataSet_DataSetNameTextBox" />
, as it is contained by a formview, which is contained by a master page
placeholder, and so on.

As you can see, the textbox is outputted as an input, so trying to
access the Text property will result in a javascript error.

 

[Steve C. Orr [MVP, MCSD]]

Look closer. The server side code is generating the client side code.