How can I use VB codebehind in ASP to display a dialog box to the user asking for a yes or no response?

Question

How can I use VB codebehind in ASP to display a dialog box to the user asking for a yes or no response?

I am faced with a scenario where a user has chosen a product, the system has retrieved the product record, and the backorder flag has been set. I need to inquire if the user still wants to proceed with including the product in the order. However, I am struggling to find a clear example of implementing this within an IF statement.

Here is my snippet of VB Code:

    Dim backorder = myDataTable.Rows(0)("backorder").ToString()
    If backorder = "True" And <somehow prompt the user about including it in the order> Then
       'do something
    End If

And here is my JavaScript code in the ASPX file:

    <script type = "text/javascript">
     function Confirm() {
         var confirm_value = document.createElement("INPUT");
         confirm_value.type = "hidden";
         confirm_value.name = "confirm_value";
         if (confirm("Selected item is on temporary back order. Do you want to include it on this order?")) {
             confirm_value.value = "Yes";
         } else {
             confirm_value.value = "No";
         }
         document.forms[0].appendChild(confirm_value);
     }
</script>

I can retrieve the variable added by JavaScript to the page in VB, but I am having trouble understanding how to trigger the JavaScript function to prompt the user. Any guidance or examples would be greatly appreciated.

javascript asp.net vb.net

Answer 1

Answer №1

To implement the RegisterStartupScript method in your code, follow these steps:

Sub ProcessOrder()

    'Add your code to process the selected products here...
    Dim orderResponse As String = hdnConfirmResponse.Value.Trim()
    If selectedItem.BackOrdered Then
        If orderResponse = "" Then
            Dim clientScript As ClientScriptManager = Page.ClientScript

            ' Specify the name and type of the client scripts on the page.
            Dim scriptName As String = "ConfirmScript"
            Dim scriptType As Type = Me.GetType()

            ' Check if the startup script is already registered.
            If (Not clientScript.IsStartupScriptRegistered(scriptType, scriptName)) Then
                Dim scriptText As String = "Confirm();"
                clientScript.RegisterStartupScript(scriptType, scriptName, scriptText, True)
            End If
        Else
           If orderResponse = "yes" Then 
               'ADD THE CONFIRMED BACKORDERED ITEM TO THE ORDER
           End If
        End If
    End If

End Sub

Answer 2

To implement the RegisterStartupScript method in your code, follow these steps:

Sub ProcessOrder()

    'Add your code to process the selected products here...
    Dim orderResponse As String = hdnConfirmResponse.Value.Trim()
    If selectedItem.BackOrdered Then
        If orderResponse = "" Then
            Dim clientScript As ClientScriptManager = Page.ClientScript

            ' Specify the name and type of the client scripts on the page.
            Dim scriptName As String = "ConfirmScript"
            Dim scriptType As Type = Me.GetType()

            ' Check if the startup script is already registered.
            If (Not clientScript.IsStartupScriptRegistered(scriptType, scriptName)) Then
                Dim scriptText As String = "Confirm();"
                clientScript.RegisterStartupScript(scriptType, scriptName, scriptText, True)
            End If
        Else
           If orderResponse = "yes" Then 
               'ADD THE CONFIRMED BACKORDERED ITEM TO THE ORDER
           End If
        End If
    End If

End Sub

Answer 3

Answer №2

It's a bit strange to have to answer my own question, but after combining mjw's suggestion with some additional research on my JavaScript attempt, I finally found a solution. Instead of letting JS create the hidden field, I decided to add it directly to the HTML.

    <asp:HiddenField  runat="server" id ="confirm_value"/>

Updated VB code:

    If myDataTableFrame.Rows.Count > 0 Then
                Dim backorder = myDataTableFrame.Rows(0)("backorder").ToString()
                If backorder = "True" And confirm_value.Value <> "Yes" Then
                    Dim cs As ClientScriptManager = Page.ClientScript
                    ' Checking if the startup script is already registered
                    If (Not cs.IsStartupScriptRegistered(Me.GetType(), "ConfirmScript")) Then
                        Dim cstext1 As String = "Confirm();"
                        cs.RegisterStartupScript(Me.GetType(), "ConfirmScript", "Confirm();", True)
                    End If
                    Return
                Else
                    confirm_value.Value = "No"
                    ...

Updated JavaScript: Referencing ASP.NET set hiddenfield a value in Javascript. I also added functionality to click the button again if the user selects "OK".

<script type = "text/javascript">
     function Confirm() {
         if (confirm("Selected item is on temporary back order. If you want to include it on this order click OK, then resubmit it?")) {
          //had to resort to this to find hidden field rather than document.getElementById('confirm_value')
             var x = document.getElementById('<%= confirm_value.ClientID%>');
             x.value = 'Yes';
             //re-click the button
             document.getElementById('<%=bttnadd.ClientID%>').click();
         } else {
             var x = document.getElementById('<%= confirm_value.ClientID%%>');
             x.value = 'No';
         }
     }
</script>

Answer 4

It's a bit strange to have to answer my own question, but after combining mjw's suggestion with some additional research on my JavaScript attempt, I finally found a solution. Instead of letting JS create the hidden field, I decided to add it directly to the HTML.

    <asp:HiddenField  runat="server" id ="confirm_value"/>

Updated VB code:

    If myDataTableFrame.Rows.Count > 0 Then
                Dim backorder = myDataTableFrame.Rows(0)("backorder").ToString()
                If backorder = "True" And confirm_value.Value <> "Yes" Then
                    Dim cs As ClientScriptManager = Page.ClientScript
                    ' Checking if the startup script is already registered
                    If (Not cs.IsStartupScriptRegistered(Me.GetType(), "ConfirmScript")) Then
                        Dim cstext1 As String = "Confirm();"
                        cs.RegisterStartupScript(Me.GetType(), "ConfirmScript", "Confirm();", True)
                    End If
                    Return
                Else
                    confirm_value.Value = "No"
                    ...

Updated JavaScript: Referencing ASP.NET set hiddenfield a value in Javascript. I also added functionality to click the button again if the user selects "OK".

<script type = "text/javascript">
     function Confirm() {
         if (confirm("Selected item is on temporary back order. If you want to include it on this order click OK, then resubmit it?")) {
          //had to resort to this to find hidden field rather than document.getElementById('confirm_value')
             var x = document.getElementById('<%= confirm_value.ClientID%>');
             x.value = 'Yes';
             //re-click the button
             document.getElementById('<%=bttnadd.ClientID%>').click();
         } else {
             var x = document.getElementById('<%= confirm_value.ClientID%%>');
             x.value = 'No';
         }
     }
</script>

How can I use VB codebehind in ASP to display a dialog box to the user asking for a yes or no response?

Answer №1

Answer №2

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