Hi,
I got the following error if I put MultiHandleSliderExtender in ChildPage. It's working fine if I put into a normal aspx page.
Uncaught TypeError: Cannot set properties of null (setting 'Handle')
MasterPage.master
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<asp:ContentPlaceHolder id="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:ContentPlaceHolder id="body" runat="server">
</asp:ContentPlaceHolder>
</form>
</body>
</html>
NotWorking.aspx (ChildPage)
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="body" Runat="Server">
<div style="padding: 100px;">
<cc1:MultiHandleSliderExtender ID="mhse_year_range" runat="server" TargetControlID="txt_year_range"
BehaviorID="multiHandleSliderTwo" Minimum="2000" Maximum="2022" Steps="22" Length="400">
<MultiHandleSliderTargets>
<cc1:MultiHandleSliderTarget ControlID="txt_year_from" />
<cc1:MultiHandleSliderTarget ControlID="txt_year_to"/>
</MultiHandleSliderTargets>
</cc1:MultiHandleSliderExtender>
<br /><br />
<asp:TextBox ID="txt_year_from" runat="server" Text="2000"></asp:TextBox>
<asp:TextBox ID="txt_year_to" runat="server" Text="2022"></asp:TextBox>
<asp:TextBox ID="txt_year_range" runat="server"></asp:TextBox>
</div>
</asp:Content>
