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problem with function GetSlider()

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Jan
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Jan asked on 26 Oct 2009, 12:01 AM
Hi, I have a code snippet:

function GetSlider() { 
  return $find("<%= RadSlider1.ClientID %>"); 
 
var radSlider = GetSlider(); 
 
alert(radSlider); 
 
var newValue = $.cookie('site_font_size'); 
 
newValue = newValue.substring(0, newValue.length-2) 
radSlider.set_value(newValue * 10); 

in alert window i get [null] and script failed to load after radSlider.set_value(newValue * 10);

i tried use Jquery selector by id, but that returns bad object i think. I'm not very skilled in JavaScript, so don't laugh :)

radSlider I have defined with

<telerik:RadSlider ID="RadSlider1" runat="server"  OnClientValueChange="valueChanged" MinimumValue="3" MaximumValue="15"


Any ideas?







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Tsvetie
Telerik team
answered on 28 Oct 2009, 03:54 PM
Hi Jan,
Your javascript code is correct. The problem is in the time when you execute it. The client objects for the controls are created during the  Sys.Application.init event and your code executes before that. That is why you cannot get a reference to the RadSlider control - it has not been created yet. You can read mode about the client lifecycle in MSDN.

You have two options:
  1. Execute the script during the Sys.Application.load event:
    function pageLoad()
    {
        var radSlider = GetSlider();
     
        alert(radSlider);
     
        var newValue = $.cookie('site_font_size');
     
        newValue = newValue.substring(0,newValue.length - 2)
        radSlider.set_value(newValue * 10);
    }
  2. Execute the script right after the RadSlider is initialized:
    <telerik:RadSlider ID="RadSlider1" runat="server"
        MinimumValue="3" MaximumValue="15" OnClientLoaded="OnClientLoaded">
    function OnClientLoaded(sender, args)
    {
        var radSlider = GetSlider();
     
        alert(radSlider);
     
        var newValue = $.cookie('site_font_size');
     
        newValue = newValue.substring(0,newValue.length - 2)
        radSlider.set_value(newValue * 10);
    }
Best wishes,
Tsvetie
the Telerik team

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Jan
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answered on 28 Oct 2009, 04:01 PM
Thanks, you are the best!
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