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update panel issue

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User582566331 posted

I converted the application from .net 3.5 to 4.6. I added dropdownlist in update panel .But the whole page is refreshing. The same code is working fine with asp.net 3.5.My code is as below

whenever I change item in dropdownlist(test) its causing full page post back instead of partial postback.

<asp:ScriptManager runat="server" >

</asp:ScriptManager>
<div>
<asp:UpdatePanel runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:DropDownList ID="test" runat="server" AutoPostBack="true">

</asp:DropDownList>

<%-- <asp:UpdatePanel ID="UpState" runat="server">
<ContentTemplate>--%>
<asp:DropDownList ID="ddlState" runat="server" class="form-control"
Visible="False" AutoPostBack="True">
</asp:DropDownList>
<asp:TextBox ID="txtState" runat="server" MaxLength="50"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvddlState" runat="server"
ErrorMessage="State Required!" InitialValue="" ControlToValidate="DdlState"
SetFocusOnError="True" Display="Dynamic" class="star"></asp:RequiredFieldValidator>
<asp:RequiredFieldValidator ID="rfvtxtState" runat="server"
ErrorMessage="State Required!" ControlToValidate="txtState"
SetFocusOnError="True" Display="Dynamic" class="star"></asp:RequiredFieldValidator>
</ContentTemplate>
</asp:UpdatePanel>

If Not IsPostBack Then
selectCountryState("Country", "CountryId", "CountryName", test, "--Select Country--") 'Calling the Method for filling dropdowncountry
End If
End Sub

Protected Sub test_SelectedIndexChanged(sender As Object, e As EventArgs) Handles test.SelectedIndexChanged
If test.SelectedValue = _CountryId Then
selectCountryState("StateMaster", "Code", "State", ddlState, "--Select State--") 'Calling the Method for filling dropdownState
ddlState.Visible = True
txtState.Visible = False
Else
txtState.Visible = True
ddlState.Visible = False
txtState.Text = ""
End If
End Sub

Monday, October 1, 2018 9:32 AM

Answers

User61956409 posted

Hi sweetyPaul,

I do a test with your code, it works as expected on my side.

<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"></asp:ScriptManager>
            <div>
                <%=DateTime.Now %>
                <br />
                <br />
                <h3>Following Content is inside UpdatePanel</h3>
                <asp:UpdatePanel runat="server" UpdateMode="Conditional">
                    <ContentTemplate>
                        <%=DateTime.Now %>
                        <br />

                        <asp:DropDownList ID="test" runat="server" AutoPostBack="true">
                            <asp:ListItem>Item1</asp:ListItem>
                            <asp:ListItem>Item2</asp:ListItem>
                            <asp:ListItem>Item3</asp:ListItem>
                        </asp:DropDownList>
                        <asp:DropDownList ID="ddlState" runat="server" class="form-control"
                            Visible="False" AutoPostBack="True">
                        </asp:DropDownList>
                        <asp:TextBox ID="txtState" runat="server" MaxLength="50"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="rfvddlState" runat="server"
                            ErrorMessage="State Required!" InitialValue="" ControlToValidate="DdlState"
                            SetFocusOnError="True" Display="Dynamic" class="star"></asp:RequiredFieldValidator>
                        <asp:RequiredFieldValidator ID="rfvtxtState" runat="server"
                            ErrorMessage="State Required!" ControlToValidate="txtState"
                            SetFocusOnError="True" Display="Dynamic" class="star"></asp:RequiredFieldValidator>
                    </ContentTemplate>
                </asp:UpdatePanel>
            </div>
        </div>
    </form>
</body>
</html>

Test Result:

If possible, you can create a new project with .NET framework 4.6 and test if the above code work fine.

With Regards,

Fei Han

Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM

Tuesday, October 2, 2018 7:28 AM

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User-471420332 posted

Don't copy paste your old code to into new project code, try to write code then check.
- Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM
Wednesday, October 3, 2018 5:16 AM

All replies

User-943250815 posted

Try add Triggers

<asp:UpdatePanel runat="server" UpdateMode="Conditional">
  <Triggers>
    <asp:AsyncPostBackTrigger ControlID="test" EventName="SelectedIndexChanged" />
  </Triggers>
  <ContentTemplate>
    <asp:DropDownList ID="test" runat="server" AutoPostBack="true"></asp:DropDownList>
    <asp:DropDownList ID="ddlState" runat="server" class="form-control" Visible="False" AutoPostBack="True"></asp:DropDownList>
    <asp:TextBox ID="txtState" runat="server" MaxLength="50"></asp:TextBox>
    <asp:RequiredFieldValidator ID="rfvddlState" runat="server" ErrorMessage="State Required!" InitialValue="" ControlToValidate="DdlState" SetFocusOnError="True" Display="Dynamic" class="star"></asp:RequiredFieldValidator>
    <asp:RequiredFieldValidator ID="rfvtxtState" runat="server" ErrorMessage="State Required!" ControlToValidate="txtState" SetFocusOnError="True" Display="Dynamic" class="star"></asp:RequiredFieldValidator>
  </ContentTemplate>
</asp:UpdatePanel>

Monday, October 1, 2018 3:14 PM