Preventing alert to show two popups when button is clicked twice

Lets say we have 开发者_开发百科a js function which shows a pop up on a button click. But if the button is clicked twice in a hurry it show two popups. Is there any way to prevent alert to show two pop ups when the button is clicked twice in a hurry?

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you could set a variable to store a flag to say the alert is already been shown?

//outside the event
var flagShown = false;

// in the event
if(!flagShown){
alert();
flagShow = true;
}

I havent tested this code...

HTH

Edit: this will make it show only once. You would have to reset the flag based on a timer or on some other event.

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using a var that store the fact that a display is under way ?

Could not check as I'm not able to clic fast enough for 2 clics to be triggered...

var alert_under_way=0;

function doIt()
{
if (! alert_under_way)
  {
  alert_under_way =1;
  alert("toto");
  alert_under_way =0;
  }
}

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I have used the following code to prevent the display of two popups:

var prevent_popup=false;

        function show_popup()
        {
            .....
            .....
            if(!prevent_popup)
            alert("some text");
            prevent_popup=true;
            setTimeout('prevent_popup=false;',1000);
            .....
            .....
        }

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You could also disable the button once its been clicked and enable it again if you need to.