how do I know it's posted back due to a button click in Form_Load

Discussion in 'ASP .Net' started by Guest, Apr 27, 2006.

  1. Guest

    Guest Guest

    I have an asp button control(called buttonA), and in the Form_Load event I
    want to know if the postback is due to the click of ButtonA. Which method
    should I use to achieve this?

    Guest, Apr 27, 2006
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  2. Guest

    Paul Bush Guest

    Probably a better way but right off the top here goes.

    asp:hiddenfield, session key, querystring, etc...

    protected void _buttonA_Click(object sender, EventArgs e)
    _hiddenField.Value = "A";
    // you could also do the following:
    // Session["sessionKey"] = "A";

    if(_hiddenField == "A")
    // do something here

    if(Session["sessionKey"].ToString() == "A")
    // do something here
    Paul Bush, Apr 27, 2006
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  3. Guest

    Guest Guest

    What I want is to detect if it's from ButtonA click in the Form_Load
    even(this is before the ButtonCLick event gets called), and if it is I will
    skip some code in the Form_Load .

    Guest, Apr 27, 2006
  4. Guest

    Guest Guest

    What do you mean by the Form_Load event, do you have a control called Form
    and Form_Load is the event handler for it's OnLoad event?
    Guest, Apr 28, 2006
  5. Guest

    Damien Guest

    In VB:

    If Not Request.Params("ButtonA") is Nothing Then
    'Do stuff if button A was pressed
    'Do stuff if button A wasn't pressed
    End If

    However, I wouldn't recommend it. You've now, potentially, got two
    places where code reacts to button presses - in the Page Load event and
    in the button Click event. A future maintainer (or a future you) may be
    confused if they don't spot the code in Page Load, and spend valuable
    time trying to diagnose why the page acts differently when the button
    is pressed.

    Perhaps if you could elaborate on what behaviour you're altering, we
    could suggest some viable alternatives?

    Damien, Apr 28, 2006
  6. Guest

    Bill Gregg Guest

    In the Form Load event handler, can't you interrogate the sender object
    to determine whether or not button A was pressed?

    Bill Gregg, Apr 28, 2006
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