Prompt for confirmation in ASP.NET code-behind with conditions

Question

Prompt for confirmation in ASP.NET code-behind with conditions

I've searched around for a solution to this problem. Below is a representation of my pseudocode:

bool hasData = ItemHasData(itemid);
Confirm = "false"; // hidden variable

if (hasData)
{
    //Code to call confirm(message) returns "true" or "false"
    if (Confirm == "true")
    {
         //Delete item
    }
    else if (Confirm == "false")
    {
         return;
    }
}

The code calling the confirm function uses an asp:Literal control and assigns it the value of the confirmation message. I am able to display the popup, however, it only appears after the execution of the function and does not handle subsequent conditions.

The general consensus is that invoking JavaScript at that specific line is unachievable due to the gap between server-side and client-side operations. How can I work around this? I attempted using the ConfirmButtonExtender from the ASP.NET AJAX Toolkit but encountered issues interacting with the object in the code behind when it is set to runat="server".

Edit:

Apologies for missing those details. Much appreciated, Icarus.

The control in question is the GridView (the pseudo version actually pertains to the gvData_RowCommand function)'s rowcommand. The initial check confirms whether the CommandName is DeleteItem, triggering subsequent actions.

The columns in gvData are determined by a list of headers and dataset; the table caters to multiple items with varying required information. While the data is present, I need a Yes/No (or, more realistically, Ok/Cancel) dialog to confirm deletion intentions when there is existing data.

javascript asp.net ajax confirm

Answer 1

Answer №1

When faced with certain situations, one approach I often take is to implement a Panel that showcases the Confirm and Cancel buttons. This eliminates the necessity of dealing with JavaScript events and allows for complete utilization of ASP.NET.

<asp:Panel ID="pDeleteConfirm" runat="server"
    CssClass="AlertDialog"
    Visible="False">
    <p>Do you wish to delete the selected record?<br />
    <asp:Button ID="btDeleteYes" runat="server" OnClick="btDelete_Click" Text="Delete" />
    <asp:Button ID="btDeleteNo" runat="server" OnClick="btDelete_Click" Text="Cancel" />
    </p>
</asp:Panel>

<asp:GridView ID="gvData" runat="server"
    AutoGenerateColumns="False" 
    CssClass="GridView"
    DataKeyNames="ID"
    DataSourceID="sqlData"
    EmptyDataText="There is no data entered in the system."
    OnRowDeleting="gvData_RowDeleting">
    ......
</asp:GridView>

The OnRowDeleting event triggers the display of the Panel

protected void gvData_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    // Show confirmation dialog
    pDeleteConfirm.Visible = true;

    // Select the row to delete
    gvData.SelectedIndex = e.RowIndex;

    // Cancel the delete so the user can use the confirm box
    e.Cancel = true;
}

Management of the button Click events

protected void btDelete_Click(object sender, EventArgs e)
{
    Button bt = (Button)sender;
    switch (bt.ID)
    {
        case "btDeleteYes": // they confirmed a delete
            sqlData.Delete();
            break;

        case "btDeleteNo": // they clicked cancel
            // Do nothing
            break;

        default:
            throw new Exception("Unknow button click in btDelete_Click");
    }
    // clear selection and hide the confirm box
    gvData.SelectedIndex = -1;
    pDeleteConfirm.Visible = false;
}

While this doesn't involve JavaScript directly, you can introduce some UpdatePanels for AJAX functionality.

An alternative method using ASP.NET instead of relying on JavaScript for handling.

Answer 2

When faced with certain situations, one approach I often take is to implement a Panel that showcases the Confirm and Cancel buttons. This eliminates the necessity of dealing with JavaScript events and allows for complete utilization of ASP.NET.

<asp:Panel ID="pDeleteConfirm" runat="server"
    CssClass="AlertDialog"
    Visible="False">
    <p>Do you wish to delete the selected record?<br />
    <asp:Button ID="btDeleteYes" runat="server" OnClick="btDelete_Click" Text="Delete" />
    <asp:Button ID="btDeleteNo" runat="server" OnClick="btDelete_Click" Text="Cancel" />
    </p>
</asp:Panel>

<asp:GridView ID="gvData" runat="server"
    AutoGenerateColumns="False" 
    CssClass="GridView"
    DataKeyNames="ID"
    DataSourceID="sqlData"
    EmptyDataText="There is no data entered in the system."
    OnRowDeleting="gvData_RowDeleting">
    ......
</asp:GridView>

The OnRowDeleting event triggers the display of the Panel

protected void gvData_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    // Show confirmation dialog
    pDeleteConfirm.Visible = true;

    // Select the row to delete
    gvData.SelectedIndex = e.RowIndex;

    // Cancel the delete so the user can use the confirm box
    e.Cancel = true;
}

Management of the button Click events

protected void btDelete_Click(object sender, EventArgs e)
{
    Button bt = (Button)sender;
    switch (bt.ID)
    {
        case "btDeleteYes": // they confirmed a delete
            sqlData.Delete();
            break;

        case "btDeleteNo": // they clicked cancel
            // Do nothing
            break;

        default:
            throw new Exception("Unknow button click in btDelete_Click");
    }
    // clear selection and hide the confirm box
    gvData.SelectedIndex = -1;
    pDeleteConfirm.Visible = false;
}

While this doesn't involve JavaScript directly, you can introduce some UpdatePanels for AJAX functionality.

An alternative method using ASP.NET instead of relying on JavaScript for handling.

Answer 3

Answer №2

When your code-behind finishes its job of rendering HTML to the browser, the socket closes and your server-side code stops running.

To achieve this functionality, you will need to use a JavaScript function on the client side.

If you want to notify the user of any loaded data before they perform a specific action or attempt to navigate away from the page, you must display an alert using scripting when that event occurs on the page.

Answer 4

When your code-behind finishes its job of rendering HTML to the browser, the socket closes and your server-side code stops running.

To achieve this functionality, you will need to use a JavaScript function on the client side.

If you want to notify the user of any loaded data before they perform a specific action or attempt to navigate away from the page, you must display an alert using scripting when that event occurs on the page.

Prompt for confirmation in ASP.NET code-behind with conditions

Answer №1

Answer №2

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