Break while loop with timer?

Question

I was wondering is it possible to break a while loop with a timer? looked on the internet but could not find a solution for it.

while (true) {
  alert('hi');
} if (timer < 0) {
 timer?
 document.write('Time is up!');
 break;
}

Thank you.

Your example is too broad, as of that giving an answer is not easy. You should change your example code, so that it will show why you need the while(true) loop. Do you only need it to pause it execution until the time is up or do you want to do anything within the loop until the time is up? — t.niese
– t.niese, Commented Nov 22, 2015 at 17:15
Since JavaScript is single-threaded, as long as you're stuck inside the loop nothing else can be evaluated, including something in a setTimeout. The timed callback will be queued and evaluated only when the currently running code has completed. There is probably a solution (not involving a loop) to your actual problem, but not to your silly example. — Touffy
– Touffy, Commented Nov 22, 2015 at 17:32
Thank you for the fast response. I was wondering if I could break a loop by using a timer. I am constructing a qwiz a list of questions and I want to add a timer so that if the player is in the game and takes to long a timer will show that he losses and can try again — Amadeo Brands
– Amadeo Brands, Commented Nov 22, 2015 at 18:39

Kishore Sahasranaman · Accepted Answer · 2015-11-22 17:19:40Z

1

You should use setTimeout for this.

var timer = 3;
setTimeout(excuteMethod, 1000);

function excuteMethod() {
  alert(timer + ' call');
  timer--;
  if (timer >= 0) setTimeout(excuteMethod, 1000);
}

Demo : http://jsfiddle.net/kishoresahas/9s9z7adt/

answered Nov 22, 2015 at 17:19

Kishore Sahasranaman

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Comments

Rajesh Dixit · Accepted Answer · 2015-11-23 07:53:18Z

0

I'm not sure if this is the correct approach, but it works,

(function() {
  var delay = 30;
  var date = new Date();
  var timer = date.setTime(date.getTime() + delay);
  var count = 0;

  function validate() {
    var now = new Date();
    if (+now > timer)
      return false;
    else
      return true;
  }

  while (true) {
    count++;
    console.log(count);
    if (!validate()) {
      console.log("Time expired");
      break;
    }

    // Fail safe.
    if (count > 50000) {
      console.log("Count breached")
      break;
    }
  }
})()

answered Nov 23, 2015 at 7:53

Rajesh Dixit

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Comments

Engin Üstün · Accepted Answer · 2015-11-23 08:25:22Z

0

You can change control value in timer function and break the loop.

var control = true;
while(control)
{
    ...
}

setTimeout(function(){
    control = false;
}, delay); //delay is miliseconds

Or based on counter

var control = true,
    counter = 10;

while(control){
    ...
}

// you can handle as count down
// count down counter every 1000 miliseconds
// after 10(counter start value) seconds
// change control value to false to break while loop
// and clear interval
var counterInterval = setInterval(function(){
    counter--;
    if(counter == 0)
    {
        control = false;
        clearInterval(counterInterval);
    }
},1000);

edited Nov 23, 2015 at 8:25

answered Nov 23, 2015 at 8:08

Engin Üstün

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