Question

-4

How to start setInterval loop immediately?

rated 0 times [ 2] [ 6] / answers: 1 / hits: 89128 / 12 Years ago, sat, may 12, 2012, 12:00:00

In a simple setInterval

setInterval(function() {

      // Do something every 9 seconds

}, 9000);

The first action will happen after 9 seconds (t=9s). How to force the loop to perform the first action immediately (t=0)?

I think it is due to the mechanism of setInterval to have Delay - Action - Delay - Action ... loop; instead of Action - Delay - Action - Delay ... loop.

EDIT: My function is indeed a loop as

setInterval(function(){

$('.test').each(function(idx){

    var duration = 1000;

    $(this).delay(duration*idx);

    Some stuff here

});

}, 4000);

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anyssaarielles

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4 Years ago

answered 12 Years ago wilson · Accepted Answer

Keep it simple. You can use a named function instead of an anonymous function; call it and set an interval for it.

function doSomething() {

    console.log(tick);

}

doSomething();

setInterval(doSomething, 9000);

Create a scope if necessary:

(function() {

    function doSomething() {

        console.log(tick);

    }

    doSomething();

    setInterval(doSomething, 9000);

})();

Finally, the following works without creating or affecting x:

setInterval(function x() {

    console.log(tick);

    return x;

}(), 9000);