AJAX VB.Net UpdatePanel - Run Javascript on Partial Postback: AJAX, VB.Net, UpdatePanel, Javascript, Partial Postback

AJAX VB.Net UpdatePanel - Run Javascript on Partial Postback

Hello,

On my website I have a few input fields that are either shown or hidden based on a JavaScript function. The script works great, however the input fields are in an UpdatePanel, and when it does a partial postback, all is lost. I need a way to call the function after the updatePanel has finished the PartialPostback.

The only link that I could find is this one:
http://zeemalik.wordpress.com/2007/11/27/how-to-call-client-side-javascript-function-after-an-updatepanel-asychronous-ajax-request-is-over/

I tried that out, but I can't get it to work.

I've also tried to just include the call:

<script type="text/javascript">
CountryChanged(ddCountry.value);
</script>

towards the bottom of the UpdatePanel, but that didn't work either.

I've also looked at doing both:
ScriptManagerProxy1.page.ClientScript.RegisterStartupScript(Page.GetType(), "CheckCountry", "CountryChanged(" + strCountry + ");"))

and
page.ClientScript.RegisterStartupScript(Page.GetType(), "CheckCountry", "CountryChanged(" + strCountry + ");"))

Same thing, no luck.

Any Ideas?

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Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginRequestHandle); Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequestHandle); function beginRequestHandle(sender, Args) { alert("begin request! You can display a loading images here"); //You can get the id of the control causing postback //to make sure that postback come from you updatepanel using: //Args.get_postBackElement().id return true; } function endRequestHandle(sender, Args) { alert("End request! Do somethings extra here"); return true; }

Alright. So if that's the way to go. The error that when I'm debugging the Java Script is: "Sys is undefined".

I'm not sure if you need the code or not, but here it is:

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
 
<!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></title>
    
   
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
            <script type="text/javascript" language="javascript">
                function BeginRequestHandler(sender, args) {
                    var elem = args.get_postBackElement();
                    ActivateAlertDiv('visible', 'AlertDiv', elem.value + ' processing...');
                }
                function EndRequestHandler(sender, args) {
                    ActivateAlertDiv('hidden', 'pleasewaitScreen', '');
                }
                function ActivateAlertDiv(visstring, elem, msg) {
                    var adiv = $get(elem);
                    adiv.style.visibility = visstring;
                    adiv.innerHTML = msg;
                }
                Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);
                Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
            </script>
 
        <p><asp:Label ID="lbUpdatePage" runat="server" ></asp:Label></p>
 
        <asp:UpdatePanel ID="UpdatePanel3" runat="server">
            <ContentTemplate>
                 <p><asp:Button ID="Button3" runat="server" Text="Button" /></p>  
            </ContentTemplate>
        </asp:UpdatePanel>
 
        <asp:UpdatePanel ID="UpdatePanel2" runat="server">
            <ContentTemplate>
                 <p><asp:TextBox ID="tb1" runat="server" Text="Text" AutoPostBack="True" /></p>  
            </ContentTemplate>
        </asp:UpdatePanel>
        
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
               <p>
                <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
                 <asp:ListItem Text="1" Value="1"></asp:ListItem>
                 <asp:ListItem Text="2" Value="2"></asp:ListItem>
                 <asp:ListItem Text="3" Value="3"></asp:ListItem>
                </asp:DropDownList>
               </p>
            </ContentTemplate>
        </asp:UpdatePanel>
        
        <asp:UpdatePanel ID="UpdatePanel4" runat="server">
            <ContentTemplate>
                 <p><asp:Label ID="label1" runat="server" ></asp:Label></p>
                 <p><asp:Label ID="label2" runat="server" ></asp:Label></p>                
                 <p><asp:Label ID="label3" runat="server" ></asp:Label></p>                
                 <p><asp:Label ID="label4" runat="server" ></asp:Label></p>                
            </ContentTemplate>
        </asp:UpdatePanel>
        
        <DIV ID="pleasewaitScreen" STYLE="position:relative;z-index:5;visibility:hidden">
			<TABLE BGCOLOR="#000000" BORDER="1" BORDERCOLOR="#000000" CELLPADDING="0" CELLSPACING="0" HEIGHT="100" WIDTH="250" ID="Table1">
				<TR>
					<TD WIDTH="100%" HEIGHT="100%" BGCOLOR="silver" ALIGN="CENTER" VALIGN="MIDDLE">
						<FONT FACE="Arial" SIZE="4" COLOR="blue"><B>Calculating Shipping<br>
								Please Wait</B></FONT>
					</TD>
				</TR>
			</TABLE>
		</DIV>
 
    </div>
    </form>
</body>
</html>
 
-----------------------------------------------------------------
Partial Class _Default
    Inherits System.Web.UI.Page
 
    Protected Sub Button3_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button3.Click
        label1.Text = "Clicked at " & DateTime.Now.ToString()
    End Sub
 
    Protected Sub tb1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles tb1.TextChanged
        label2.Text = "Changed at " & DateTime.Now.ToString()
    End Sub
 
    Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
        label3.Text = "Changed at " & DateTime.Now.ToString()
    End Sub
 
    Protected Sub UpdatePanel4_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles UpdatePanel4.Load
        label4.Text = "Panel Refreshed at " & DateTime.Now.ToString()
    End Sub
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        lbUpdatePage.Text = "Page Refreshed at " & DateTime.Now.ToString()
    End Sub
End Class

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AJAX VB.Net UpdatePanel - Run Javascript on Partial Postback

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