jQuery call function randomly in multiples

Question

I'm coding a game that has a 2 minute timer countdown - within that time i want an alert to popup randomly in multiples of 10 seconds. The alert could be called at 10 seconds, 30 seconds or even 110 seconds - as long as they are in multiples of 10.

(function loop() {
    var rand = Math.round(Math.random() * (60000 - 10000)) + 10000;
    setTimeout(function() {
            alert("hi");
            loop();  
    }, rand);
}());

I've found some code whilst doing some research but I don't think I've quite got it right?

Can anyone help?

Thanks Al

Please describe the error / behaviour you are seeing when you run the code. — Tim Bull
– Tim Bull, Commented Mar 9, 2016 at 16:55

BenG · Accepted Answer · 2016-03-09 16:52:54Z

1

I would do:-

Math.round((Math.random() * 10) + 1); giving you a number 1 and 11

* 10000 to get seconds from 10 to 110, in intervals of 10.

clearTimeout incase the 2nd/3rd/etc timer goes over 2 minutes

var randTimer;

setTimeout(function() {
  alert('Game Over');
  clearTimeout(randTimer);
}, 120000); // 2 minutes

(function randomTimer() {
  var rand = Math.round((Math.random() * 10) + 1); // 1 to 11
  randTimer = setTimeout(function() {
    alert('Random');
    randomTimer();
  }, rand * 10000); // 10 to 110 seconds
}());

answered Mar 9, 2016 at 16:52

BenG

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1 Comment

alib0ng0 Over a year ago

Works great - I changed 'rand * 10000' to 5000 so that it gets called at least a few times during the 2 minutes. Many thanks

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