PageMethods is not defined [Tried everything i could]

Question

3.67/5 (2 votes)

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i tried everything i could, but still no luck. where is my mistake?

Default2.aspx

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">

    <title></title>
    <script type="text/javascript">
        function InsertLabelData() {
            PageMethods.GetLabelText(onSuccess, onFailure);
        }

        function onSuccess(result) {
            var lbl = document.getElementById('lbl');
            lbl.innerHTML = result;
        }

        function onFailure(error) {
            alert(error);
        }

        InsertLabelData();
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <label id="lbl"></label>
            <asp:ScriptManager ID="ScriptManager2" runat="server" EnablePageMethods="true" EnablePartialRendering="true">
            </asp:ScriptManager>


        </div>
    </form>
</body>
</html>

Default2.aspx.cs

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    [WebMethod]
    public static string GetLabelText()
    {
        return "Hello";
    }
}

Posted 29-May-13 21:48pm

melvintcs

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Anurag Sinha V · Accepted Answer · 2013-05-29T22:23:00

Hii,

Well PageMethods have always been a controversial topic but I believe they will be called when you have an event attached to the control whihc you are using. In this case if you put a Javascript event such as 'onmouseover', then it works perfectly...

C#

ex:
<script type="text/javascript">

        function GetLabel() {
            PageMethods.GetLabelText(onsuccess, onfailure);
        }
        function onsuccess(result) {
            var x = document.getElementById('lblnew');
            x.innerHTML = result;
        }
        function onfailure(error) {
            alert(error);
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <label id="lblnew" onmouseover="GetLabel();"> hiii</label>

        <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
        </asp:ScriptManager>

    </div>
    </form>
</body>
</html>

aspx.cs:

C#

[System.Web.Services.WebMethod]
public static string GetLabelText()
{
    return "Dark Knight";
}

Calling a plain Javascript function won't work IMO because the label control doesnot know when to call it. Try like this and you will understand much stuffs.
Happy Coding...