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[Solved] Ajax Postback on page load

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Ajax

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Brete asked on 08 May 2008, 02:17 PM

I am trying to have a ajax page initiate self - postback after the page loads on the client side the first time. The script raises a "object is null error" when it trys to run. However if I ignore the error and manually click the button it works. Here is a simplified sample of the code.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestAjax2.aspx.cs" Inherits="TestAjax2" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<!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">
    <title>Untitled Page</title>
</head>
<body >
    <form id="form1" runat="server">
    <div>
       <telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">

<script language=jscript>
function xpress(){


$find('<%=RadAjaxPanel1.ClientID%>').ajaxRequestWithTarget("<%= RadAjaxPanel1.UniqueID %>", "Button1Press")
}
</script>
</telerik:RadScriptBlock >
    <telerik:RadScriptManager ID="RadScriptManager1" runat="server">

    </telerik:RadScriptManager>
    <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" Height="200px" Width="300px">


        <asp:Label ID="Label1" runat="server" Text=""></asp:Label>


      <br />
    <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
     <input type=button id=buttonx   value="Change color" onclick='<%=RadAjaxPanel1.ClientID%>.ajaxRequestWithTarget("<%= RadAjaxPanel1.UniqueID %>", "ButtonxPress")' />
      <input type=button id=button1   value="Change colorx" onclick='xpress()' />
    </telerik:RadCodeBlock>
    </telerik:RadAjaxPanel>
    </div>
    </form>
</body>
</html>

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class TestAjax2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

    protected void Page_PreRender(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
                Type cstype = this.GetType();

            //    ClientScript.RegisterStartupScript(cstype, "", "xpress();", true);

ScriptManager.RegisterStartupScript(this.Page, cstype, "", "javascript:xpress();", true);

}

    }
    protected override void RaisePostBackEvent(IPostBackEventHandler source, String eventArgument)
    {
        base.RaisePostBackEvent(source, eventArgument);
        Label1.Text = eventArgument;
    }
}

[Solved] Ajax Postback on page load

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