Get textbox value in client side

My problem is that in my ascx file i have a textbox & a input buttom with a javascript function that will validate the textbox: 

<script lang="javascript">
function Test() {
if (document.all.txt1.value == "") {
<asp:textbox id="txt1" runat="Server"></textbox>
<input type=button id="cmd1" onclick="javascript:Test();" value="Add">
But the function don't work, because the textbox control isn't recognised ("undefined")!
It seems that id of textbox control isn't generated in the client side, something about token id!?!
Any help will be great.
Thanks for all.
Renato Neves
8/26/2003 4:37:51 PM 93655 articles. 5 followers. Follow

12 Replies

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Try changing 'all' to the actual form name.
David Wier
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8/26/2003 4:51:40 PM
Actually, if I'm not mistaken you have to put a

attribute inside the textbox field in order to take advantage of JavaScripts dot notation. So then you could do something like
8/26/2003 5:24:47 PM
I usually try to refer to everything by it's ID:

8/26/2003 6:09:15 PM
Thanks for all the help that was given, but i don't have success! 

Why? In first place, i can't change the "all" to the form name because this controls are in a .ascx file, therefore don't exists the <Form> tag.
Second, if i try to refer the control by is ID:
i can't get any value, because the ID of the textbox control in the client side isn't 'txt1', but '_ctrl1_txt1' or something seemed. I try with document.getElementByName('txt1'), but the result is the same, i can't get any reference to the textbox!!!
Any ideia!?
8/27/2003 10:14:14 AM
I just try everything to get "control" of the textbox control in the client side but nothing. I just try to add a attribute to the textbox:

<behind code>
txt1.Attributes.Add("onBlur", "AddAt(" + txt1.ClientID + ")")
function Add(objID) {
var objTXT = document.getElementByID(objID);
Despite the ID is send correct to the function, the getElementByID can't get element, just "break/stop". The alert isn't run!
Also try to get control by another ways that i found in the forum, but the result was the some:
document.all["txt1"].style.display = 'none';
document.all.elements["txt1"].style.display = 'block';
How can this be possible?! There isn't any way to get the control of the textbox in a .ASCX FILE!?!
I'm despaired :((( Need help.
Renato Neves
8/27/2003 11:04:02 AM
So if the ID on the client side is "_ctr1_txt1" why don't you just use getElementByID("_ctr1_txt1")?

But maybe another solution to your problem is to not use JavaScript explicitly to validate and use one of the sever validation controls. Looks like the RequiredValidator is what you're implementing manually.
9/4/2003 11:44:29 PM
To get the correct client-side ID for sure, you'd need to use Control's ClientID property to create the script and you can get that only via server-side code, so you need to create some of the script using server-side code.

<script lang="javascript">
function Test() {
if (document.getElementById('<%=txt1.ClientID%>').value == "") {

<asp:textbox id="txt1" runat="Server"></asp:textbox>
<input type=button id="cmd1" onclick="javascript:Test();" value="Add">

Teemu Keiski
Finland, EU
9/5/2003 3:58:38 PM
And the winner is: "joteke" 

<CLAP> <CLAP> <CLAP> :))))
To all the despaired that have the same problem, try the joteke ideia. for me it works! :))))))
One more thing: thanks all ppl that try to help me.
Bye bye, i have work to do.
9/5/2003 4:29:56 PM
It works for me but if I set the Visible property of the textbox to false, I get an error. 

Is there a work around for this?
10/8/2003 10:59:44 PM
Never mine, I use the 

<input type="hidden" id="Hidden" runat="server" >
Control instead of TextBox
10/8/2003 11:05:46 PM
document.getElementById('<%=txt1.ClientID%>').value   is only to get the value ?

Actually I try to write into a text box, but I can't.
I've tried this:
document.getElementById('<%=txt1.ClientID%>').value = "test"
but nothing appear

Let's say I have a html textbox (<input name="tmp" type="text") instead asp:textbox. So, how can I write to that textbox ?
document.forms[0].tmp.value = "ok" doesn't work
document.getElementById('<%=tmp.ClientID%>').value = "ok" doesn't work neither
Any idea ?
Btw, these textboxes are in the user control (ascx).
2/3/2004 3:33:30 AM
i think it's just the references to .forms[0] that is killing you; the .getElementById function works fine.

maybe the form[0] does NOT have an object with NAME="tmp" attribute (maybe just the ID="tmp" and is missing the name?) how many <form> tags are on your document?
could it be that when the .ascx is rendered , it is not enclosed in the <form></form> tags?
just some ideas to look at.
here's some straight html that shows how you can get or set the value in a textbox with javascript; it is the same as what you were doing before, just not muddied with the asp side stuff yet:

<!--the form's "submitonce" field prevents people from hitting back button and resubmitting-->
<FORM METHOD="POST" ACTION="" NAME="" ID="" CLASS="" ONSUBMIT="if(document.getElementById('submitonce').value !=0) {alert('Form has already been submitted.'); return false;} else { document.getElementById('submitonce').value=1; return true}">
<INPUT TYPE="hidden" NAME="mode" ID="mode" VALUE="2">
<INPUT TYPE="hidden" NAME="submitonce" ID="submitonce" VALUE="0">
<TEXTAREA NAME="txt1" ID="txt1" ROWS="4" COLS="40"></TEXTAREA><BR>
<INPUT TYPE="button" NAME="aq" ID="aq" VALUE="msg the val" onclick="alert(document.getElementById('txt1').value);">&nbsp;&nbsp;
<INPUT TYPE="button" NAME="submitbtn" ID="submitbtn" VALUE="change the val" onclick="document.getElementById('txt1').value = 'test'; ">
<INPUT TYPE="text" NAME="txt2" ID="txt2" value="">
<INPUT TYPE="button" NAME="aq2" ID="aq2" VALUE="msg the val" onclick="alert(document.getElementById('txt2').value);">&nbsp;&nbsp;
<INPUT TYPE="button" NAME="submitbtn2" ID="submitbtn2" VALUE="change the val" onclick="document.getElementById('txt2').value = 'test'; ">

2/3/2004 5:32:13 PM

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