CODEWITHSUNDEEP
jquery
superUntitled
superUntitled

Reputation: 22567

jQuery: infinite loop through array... each()?

Fiddle here: http://jsfiddle.net/F6nJu/

I have a colored box:

<div id="colorblock"></div>
#colorblock { background:#3ff; width: 100%; height: 300px; }

I have an array of colors created in javascript:

var arr = [ "#f00", "#ff0", "#f0f", "#f66"];

I iterate through those colors with a jQuery each() function:

$.each(arr, function(key, value) {
  $('#colorblock').delay('1200').animate({backgroundColor:value}, 600);
});

When the array iterates to the end, how can I start the array iteration over (so the animation goes on forever)?

Upvotes: 4

Views: 10363

Answers (4)

lcllarsen
lcllarsen

Reputation: 1

var arr = ["#f00", "#ff0", "#f0f", "#f66"];

(function recurse(counter) {
    var arrLength = arr.length;
    var index = counter%arrLength;

    var color = arr[index];

    $('#colorblock').delay('1200').animate({
       backgroundColor: color
     }, 600);

    setTimeout(function() {
       recurse(counter + 1);
    }, 200);

})(0);

Upvotes: 0

Panagiotis Panagi
Panagiotis Panagi

Reputation: 10087

Array.prototype.recurse = function(callback, delay) {
   delay = delay || 200; 
   var self = this, idx = 0;

   setInterval(function() {
      callback(self[idx], idx);
      idx = (idx+1 < self.length) ? idx+1 : 0;
   }, delay);
}

Try it on StackOverFlow:

["#f00", "#ff0", "#f0f", "#f66"].recurse(function(item, index) { 
    $('body').css('background-color', item);
}, 300);

Upvotes: 2

Raynos
Raynos

Reputation: 169551

var arr = ["#f00", "#ff0", "#f0f", "#f66"];

// run through the array forever
(function recurse(counter) {
    // get the colour
    var color = arr[counter];
    // animate it
    $('#colorblock').delay('1200').animate({
        backgroundColor: color
    }, 600);
    // delete the value to save memory
    delete arr[counter];
    // add the value at the end of the array
    arr.push(color);
    // run it again for the next number
    setTimeout(function() {
        recurse(counter + 1);
    }, 200);
// start it for the first number.
})(0);

Infinite recursion. Delete the current entry, then add the current value to the end.

Live Example

For those who are interested in what the array looks like:

["#foo", "#ff0", "#f0f", "#f66"] (counter = 0)
[undefined, "#ff0", "#f0f", "#f66", "#foo"] (counter = 1)
[undefined, undefined, "#f0f", "#f66", "#foo", "#ff0"] (counter = 2)
[undefined, undefined, undefined, "#f66", "#foo", "#ff0", "#f0f"] (counter = 3)
[undefined, undefined, undefined, undefined, "#foo", "#ff0", "#f0f", "#f66"] (counter = 4)
etc.

Upvotes: 11

Naftali
Naftali

Reputation: 146360

Try this:

var arr = ["#f00", "#ff0", "#f0f", "#f66"];
$.each(arr, function(key, value) {
    set_color(value);
});

function set_color(color) {
    $('#colorblock').delay('1200').animate({
        backgroundColor: color
    }, 600);
    setTimeout(function() {
        set_color(color);
    }, 2000); //restart in 2 seconds
}

Fiddle: http://jsfiddle.net/maniator/F6nJu/1/

Upvotes: 5

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