how to stop a javascript loop for a particular interval of time?

Question

i am using javascript for loop, to loop through a particular array and alert it's value. I want that after every alert it should stop for 30 seconds and then continue...till the end of loop. my code goes here..

    for(var i=0; i<valArray.lenght; i++)
    {
        alert("The value ="+valArray[i]);
        //stop for 30seconds..      
    }

i have used setTimeout() function, but it is not working...as loop end iterating but do not pause for 30seconds interval... is there any other way such as sleep function in PHP??

Delan Azabani · Accepted Answer · 2010-05-29 11:21:46Z

11

for (var i = 0; i < valArray.length; i++)
  (function(i) {
    setTimeout(function() {
      alert(valArray[i]);
    }, i * 30000);
  })(i);

Edited to fix the closure loop problem.

edited May 29, 2010 at 11:21

answered May 29, 2010 at 11:01

Delan Azabani

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2 Comments

bobince Over a year ago

Whilst timeouts are the way to return control to the browser for a while, this won't do what you think due to the Closure Loop Problem. i will be valArray.length in every timeout callback.

Delan Azabani Over a year ago

So I should wrap the setTimeout call in an anonymous that sets the value? I'll do that now.

vartec · Accepted Answer · 2010-05-29 11:06:04Z

6

There is no sleep function in JavaScript. You can refactor above code to:

function alert_and_sleep(i) {
   alert("The value ="+valArray[i]);
   if(i<valArray.length) {
     setTimeout('alert_and_sleep('+(i+1)+')',30000);
   }
}
alert_and_sleep(0);

answered May 29, 2010 at 11:06

vartec

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2 Comments

Delan Azabani Over a year ago

Though this works, using a for loop and creating timers of i * 30000 probably looks nicer than the semi-recursion of your answer.

vartec Over a year ago

Well, it's not optimal, but IMHO it's closer to the original code from the question.

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