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Problem with setting the value of RadTextBox client-side

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This is a migrated thread and some comments may be shown as answers.

Nicklas Johansson asked on 02 Oct 2008, 01:27 PM

I'v been beating my head with this the whole day and cant figure out why it doesn't work...

I'm trying to set the value of a RadTextBox with javascript and according to the documentation you should do that with the method set_value. However my browser keeps telling me that this method does not exist.

here is my code:

@ Page Language="C#" AutoEventWireup="true" CodeBehind="Test.aspx.cs" Inherits="GateKeeper.Test" %>

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

html xmlns="http://www.w3.org/1999/xhtml" >

head runat="server">

<telerik:RadCodeBlock runat="server">

function Configuration() {

var oInput = $get('<%= TestTextBox.ClientID%>');

oInput.set_value(

'Test');

}

</script>

</telerik:RadCodeBlock>

head>

body onload="Configuration()">

<telerik:RadScriptManager runat="server"></telerik:RadScriptManager>

<telerik:RadTextBox ID="TestTextBox" runat="server"></telerik:RadTextBox>

</form>

body>

html>

Please help!

6 Answers, 1 is accepted

answered on 02 Oct 2008, 03:21 PM

Hello Nicklas,

You are right, at the time the Configuration() function is executed, the textbox control has not been instantiated yet. That's why you need to remove the onload attribute from the <body> tag and use a different approach:

    
            <telerik:RadTextBox ID="TestTextBox" runat="server"></telerik:RadTextBox>  
        
            <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server"> 
        
            <script type="text/javascript"> 
        
            Sys.Application.add_load(Configuration) 
        
            function Configuration() { 
        
                var oInput = $find('<%= TestTextBox.ClientID%>'); 
        
                oInput.set_value('Test'); 
        
            } 
        
            </script> 
        
            </telerik:RadCodeBlock>

Greetings,
Dimo
the Telerik team

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answered on 02 Oct 2008, 03:29 PM

Hey Nicklas,

Have you tried moving the command (and using $find) to textbox clientevents like below:

    
            <telerik:RadCodeBlock runat="server">   
        
            <script type="text/javascript">   
        
            function Configuration()   
        
            {   
        
                var oInput = $find('<%= TestTextBox.ClientID %>');   
        
                oInput.set_value('Test');   
        
            }  
        
            </script>   
        
            </telerik:RadCodeBlock>   
        
            </head>   
        
            <body>   
        
            <form runat="server" id="form2">   
        
            <telerik:RadScriptManager runat="server"></telerik:RadScriptManager>   
        
            <telerik:RadTextBox ID="TestTextBox" runat="server">  
        
            <ClientEvents OnLoad="Configuration" /> 
        
            </telerik:RadTextBox>   
        
            </form>   
        
            </body>

Testing that and it works everytime... would that solution work for you? I think the problem is that you were firing it in the Body onload tag, googling that shows that a number of people have trouble with it firing in IE7 (which I am using).