Alert message on button click event

Question

I have a button and textbox on my page aspx and on button click event I am displaying alert message.

Now when I run website and click on button it display message but after that when I press F5 (Refresh) it again display message. So my question how to remove message when I click F5.

Below is my code for button click:

  protected void btnExport_Click(object sender, EventArgs e)
  {
      DisplayMessage("There is no data to Export.", this);
        
  }

and

public void DisplayMessage(String strMessage, Control name)
{
    string script = "<script language='javascript'>alert('" + strMessage + "');</script>";
    ScriptManager.RegisterStartupScript(name, name.GetType(), "JSCR", script, false);
}

on page load assign empty value to that message – Aug 12 '13 at 10:02 — , Aug 12 '13 at 10:02

score 0 · Answer 1 · edited May 23 '17 at 12:20

0

You are instigating a client side event from server side which usually does not make sense.

The behaviour you are noticing is correct, when you clicked that button a request is posted to the server which calls your button click handler which then registers the client side script when the response is returned. When you press F5 to refresh your browsers is posting that exact same request again to the server, so the button handler is fired again.

I advise you read a little about how Post And Gets work as well as how postbacks work in ASP.

edited May 23 '17 at 12:20

Community

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1

answered Aug 12 '13 at 10:03

Paulie Waulie

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so that's how it works, In struts I have to take measures to retain the value after page refresh! – Aug 12 '13 at 10:07
ASP does have Viewstate which if enabled will retain values in forms between postbacks automatically. – Paulie Waulie Aug 12 '13 at 10:08
and by default it is always on ? – Aug 12 '13 at 10:12
Viewstate should be on by default yes. – Paulie Waulie Aug 12 '13 at 10:24

score 0 · Accepted Answer · answered Aug 12 '13 at 10:09

0

Change your script as follows

string script = "alert('hello');window.location.href='Default.aspx'";

where i assumed Default.aspx is your page

answered Aug 12 '13 at 10:09

iJade

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Alert message on button click event

2 Answers2