I am trying to create a reusable function in javascript to call on buttons that require user confirmation.

I already have this code on my Master Page in WebForms.

function sweetAlertConfirm(btn, title, msg, icon) {
    if (btn.dataset.confirmed) {
        // The action was already confirmed by the user, proceed with server event
        btn.dataset.confirmed = false;
        return true;
    } else {
        // Ask the user to confirm/cancel the action
        event.preventDefault();
        Swal.fire({
            icon: icon,
            title: title,
            text: msg,
            showDenyButton: true,
            showCancelButton: true,
            confirmButtonText: 'Yes',
            denyButtonText: `No`,
        }).then((result) => {
            if (result.isConfirmed) {
                // Trigger the button click event to proceed with the server event
                btn.dataset.confirmed = true;
                btn.click();
            }
        });
    }
}

And I am implementing it on my LinkButton like this.

<asp:LinkButton runat="server" Style="margin-right: 10px;" ID="cmdDeleteGoal"
   CommandArgument='<%# DataBinder.Eval(Container.DataItem, "GoalCode") %>'
   OnClientClick="return sweetAlertConfirm(this, 'Delete Goal?', 'Do you want to delete this goal?', 'question');"
   OnClick="cmdDeleteGoal_Click"  >
   <i class="fa-solid fa-trash text-danger" data-bs-toggle="tooltip"
      data-bs-placement="top"
      title="Delete Goal"></i>
</asp:LinkButton>

CODE BEHIND

LinkButton cmdDeleteGoal = (LinkButton)sender;
                bool _converted = int.TryParse(cmdDeleteGoal.CommandArgument, out int goalCode);
               
                if (!_converted) { 
                    ShowToast("", "#00ff00");
                    return;
                }

                _systemProcess = new DeleteGoalLogic();
                _userInput = new UserInput()
                {
                    KRACode = 1,
                    GoalCode = goalCode
                };
                _systemResult = _systemProcess.DoProcess(_userInput);

                ShowToast(_systemResult.Message, (_systemResult.ResultCode == SystemResult.ResultCode_Success ? "#00ff00" : "#ff0000"));

this is the element rendered in HTML

    <a id="_bodyContent_rptrGoals_cmdDeleteGoal_0"
        href="javascript:__doPostBack('ctl00$_bodyContent$rptrGoals$ctl00$cmdDeleteGoal','')" 
        style="margin-right: 10px;">
           <i class="fa-solid fa-trash text-danger" data-bs-toggle="tooltip" data-bs-placement="top" aria-label="Delete Goal" data-bs-original-title="Delete Goal"></i>
   </a>

Now, the scenario is, The sweetalert is showing, and after I confirm on sweet alert. btn.click(); was not triggered.

I already tried console.log('test') inside this code

if (result.isConfirmed) {
    // Trigger the button click event to proceed with the server event
    btn.dataset.confirmed = true;
    btn.click();
}

and it works properly.

Now, my question is, What am I doing wrong and How can I successfully trigger the btn.click if the user confirms?

Remove the event prevent default.

Let's make a working example.

Do not use the prevent default.

Say we have a Grid view, link button click.

This:

<asp:GridView ID="GHotels" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="ID" CssClass="table table-hover" Width="50%">
        <Columns>
            <asp:BoundField DataField="FirstName" HeaderText="FirstName"  />
            <asp:BoundField DataField="LastName" HeaderText="LastName"    />
            <asp:BoundField DataField="HotelName" HeaderText="HotelName"  />
            <asp:TemplateField HeaderText="Active" ItemStyle-HorizontalAlign="Center">
                <ItemTemplate>
                    <asp:CheckBox ID="chkActive" runat="server" Checked='<%# Eval("Active") %>' />
                </ItemTemplate>
            </asp:TemplateField>

            <asp:BoundField DataField="Description" HeaderText="Description"  />

            <asp:TemplateField HeaderText="Delete" ItemStyle-HorizontalAlign="Center">
                <ItemTemplate>
                    <asp:LinkButton ID="cmdDeleteHotel" 
                        ToolTip="Delete this file"
                        runat="server"
                        OnClick="cmdDeleteHotel_Click"
                        OnClientClick="return sweetAlertConfirm(this, 'Delete Hotel?', 'Delete this hotel?', 'question');"
                        >
                            <span class="fa fa-trash-o fa-lg"></span>
                    </asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

code to load, and link delete button code:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not IsPostBack Then
        LoadGrid
    End If
End Sub

Sub LoadGrid()

    GHotels.DataSource = MyRst("SELECT * FROM tblHotelsA ORDER BY HotelName")
    GHotels.DataBind()

End Sub

Protected Sub cmdDeleteHotel_Click(sender As Object, e As EventArgs)

    Dim btn As LinkButton = sender
    Dim gRow As GridViewRow = btn.NamingContainer

    Debug.Print("Row index = " & gRow.RowIndex)
    Dim intPK As Integer = GHotels.DataKeys(gRow.RowIndex).Item("ID")

    Dim cmdSQL As New SqlCommand("DELETE FROM tblHotels WHERE ID = @ID")
    cmdSQL.Parameters.Add("@ID", SqlDbType.Int).Value = intPK
    'MyRstPE(cmdSQL)
    Debug.Print($"Will delete {intPK}")

End Sub

And the script is this:

        <script>
            function sweetAlertConfirm(btn, title, msg, icon) {

                if (btn.dataset.confirmed) {
                    // The action was already confirmed by the user, proceed with server event
                    btn.dataset.confirmed = false;
                    return true;
                } else {
                    // Ask the user to confirm/cancel the action

                    swal(msg, {
                        buttons: ["No", "Yes"],
                    }).then((willDelete) => {
                        if (willDelete) {
                            // Trigger the button click event to proceed with the server event
                            btn.dataset.confirmed = true;
                            btn.click();
                        }
                    });
                }
                return false;
            }

The result is this:

output:

Row index = 5
Will delete 3

So, you return a true or false. The above works fine as a proof of concept.

Clean up your code, your cut + paste, or code has all kinds of errors.

 Swal --- no, it lower case!!! swal(.....

and this:

    }).then((result) => {
        if (result.isConfirmed) {

should be this:

  }).then((result) => {
     if (result) {

So, yes, remove the prevent default.

Just return a true, or false to control running of the server side button.

Your click probably does not work due to errors in your js code.

Edit#2: using sweet alert 2

So, I now have this, same code really, and it still works just fine.

Remember, it is the CONCEPTS you want to learn here.

So, say we have this:

<script src="//cdn.jsdelivr.net/npm/sweetalert2@10"></script>

<asp:GridView ID="GHotels" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="ID" CssClass="table table-hover" Width="800px">
        <Columns>
            <asp:BoundField DataField="FirstName" HeaderText="FirstName"  />
            <asp:BoundField DataField="LastName" HeaderText="LastName"    />
            <asp:BoundField DataField="HotelName" HeaderText="HotelName"  />
            <asp:TemplateField HeaderText="Active" ItemStyle-HorizontalAlign="Center">
                <ItemTemplate>
                    <asp:CheckBox ID="chkActive" runat="server" Checked='<%# Eval("Active") %>' />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="Description" HeaderText="Description"  />
            <asp:TemplateField HeaderText="Delete" ItemStyle-HorizontalAlign="Center">
                <ItemTemplate>
                    <asp:LinkButton ID="cmdDeleteHotel" 
                        ToolTip="Delete this file"
                        runat="server"
                        OnClick="cmdDeleteHotel_Click"
                        OnClientClick="return sweetAlertConfirm(this);"
                        >
                        <span class="fa fa-trash-o fa-lg"></span>
                    </asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>


        <script>
            function sweetAlertConfirm(btn) {

                if (btn.dataset.confirmed) {
                    btn.dataset.confirmed = false;
                    return true;
                }

                Swal.fire({
                    title: 'Are you sure?',
                    text: "Delete This Hotel?",
                    icon: 'warning',
                    showCancelButton: true,
                    confirmButtonText: 'Yes, delete it!',
                    cancelButtonText: 'No, Cancel',
                }).then((result) => {
                    if (result.isConfirmed) {
                        // Trigger the button click event to proceed with the server event
                        btn.dataset.confirmed = true;
                        btn.click();
                    }
                })
                return false;
            }
        </script>

And once again, our code behind is this:

Protected Sub cmdDeleteHotel_Click(sender As Object, e As EventArgs)

    Dim btn As LinkButton = sender
    Dim gRow As GridViewRow = btn.NamingContainer
    Dim intPK As Integer = GHotels.DataKeys(gRow.RowIndex).Item("ID")

    Dim cmdSQL As New SqlCommand("DELETE FROM tblHotelsA WHERE ID = @ID")

    cmdSQL.Parameters.Add("@ID", SqlDbType.Int).Value = intPK
    MyRstPE(cmdSQL)
    LoadGrid()  ' update gv to show deleted

End Sub

And I as noted, UN-commented out the delete command, and removed the debug.prints.

And results are now this: