Trigger javascript confirm based on server side logic (ASP.NET)

Question

Is there a way to make the following code works? Basically, when I click on btnOne, If a is true, i expect it to popup the confirm box. And If i press yes, then it will execute btnTwo method. Otherwise, it will not do anything. At the moment, it doesn't do the popup and i am not sure why. Can someone please point me in the right direction? or possibly let me know other way of achieving this.

Any information would be much appreciated.

For example:

public void btnTwo(object sender, EventArgs e)
{
    //Do some processing
}

public void btnOne(object sender, EventArgs e)
{
    if( a == true )
        btnTwo.Attributes["onClick"] = "return confirm('test');"

    btnTwo(sender, new EventArgs());
}

What is a? And where are you invoking anything server-side? — Jonathan M
– Jonathan M, Commented Sep 29, 2011 at 14:09
assuming a is some variable that has been set somewhere. yes, it is from server side — developer
– developer, Commented Sep 29, 2011 at 14:28

Tomasz · Accepted Answer · 2011-09-29 15:18:23Z

I think you are mixing to much client and server side? Could you check "a" (hidden field) on client side?

Or after check value in code behind add start up script with confirm and then on yes "click" second button in javascript.

Protected Sub btnSecond_Click(sender As Object, e As System.EventArgs) Handles btnSecond.Click
    Me.lblInfo.Text = "SecondClick is done!"
End Sub

Protected Sub btnFirst_Click(sender As Object, e As System.EventArgs) Handles btnFirst.Click
    a = 10
    Dim action As String = "<script> if(confirm('sure ?')){  document.getElementById('" & btnSecond.ClientID & "').click()} </script>"
    If (a > 5) Then
        Page.ClientScript.RegisterStartupScript(Me.Page.GetType(), "startConfirm", action)
    End If
End Sub

And markup:

<form id="form1" runat="server">
<div>
    <asp:Button runat="server" ID="btnFirst" />
    </br>
    <asp:Button runat="server" ID="btnSecond" />
    <asp:Label runat="server" ID="lblInfo" />
</div>
</form>

James Johnson · Accepted Answer · 2011-09-29 14:17:45Z

0

Make sure that the code is being reached, and use OnClientClick instead:

protected void Page_Load(object sender, EventArgs e)
{
    bool a = true;        
    if (a)
        btnTwo.OnClientClick = "return confirm(\"Are you sure?\");";
}

answered Sep 29, 2011 at 14:17

James Johnson

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1 Comment

developer Over a year ago

Thanks James. I have given it a try, but the confirm popup didn't show up.

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