CODEWITHSUNDEEP
asp.netvb.netupdatepanel
Sixthsense
Sixthsense

Reputation: 1975

Update Panel Not working For Checkbox

In the below code Changing asyncPostBackTrigger to PostBackTrigger causing the entirepage postback.

But the below code is not at all doing anything when we use the trigger as asyncPostBackTrigger.

Any suggestions about what I am doing wrong??

<%@ 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">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
            <asp:UpdatePanel runat="server" ID="UpdatePanel_1" >

                <ContentTemplate>
                    <asp:CheckBox ID="chkNotKnown" runat="server" AutoPostBack="True" 
                                    Text="(Not Known)" OnCheckedChanged="chkNotKnown_CheckedChanged"/>
                </ContentTemplate>

                <Triggers>
                    <asp:asyncPostBackTrigger ControlID="chkNotKnown"/>
                </Triggers>

            </asp:UpdatePanel>

        <asp:TextBox ID="txtDrCode" runat="server" OnFocus="this.style.borderColor='red'" OnBlur="this.style.borderColor=''"></asp:TextBox>
    </form>
</body>

</html>

Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub chkNotKnown_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles chkNotKnown.CheckedChanged
        With txtDrCode
            If chkNotKnown.Checked Then
                .Text = "Not Known"
                .Enabled = False
            Else
                .Text = ""
                .Enabled = True
            End If
        End With
    End Sub
End Class

Upvotes: 0

Views: 2624

Answers (1)

VDWWD
VDWWD

Reputation: 35514

The chkNotKnown is inside the UpdatePanel, while txtDrCode is outside of it. Also you specify chkNotKnown as an asyncPostBackTrigger, which is the same as something already present in the UpdatePanel.

So either change the Trigger to a PostBackTrigger (causing a full PostBack)

<Triggers>
    <asp:PostBackTrigger ControlID="chkNotKnown" />
</Triggers>

Or place the TextBox inside the UpdatePanel

<asp:UpdatePanel runat="server" ID="UpdatePanel_1">
    <ContentTemplate>

        <asp:CheckBox ID="chkNotKnown" runat="server" AutoPostBack="True"
            Text="(Not Known)" OnCheckedChanged="chkNotKnown_CheckedChanged" />

        <asp:TextBox ID="txtDrCode" runat="server"></asp:TextBox>

    </ContentTemplate>
</asp:UpdatePanel>

Upvotes: 1

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