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jquery.waterfall.js
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jquery.waterfall.js
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(function($) {
/**
* Runs functions given in arguments in series, each functions passing their results to the next one.
* Return jQuery Deferred object.
*
* @example
* $.waterfall(
* function() { return $.ajax({url : first_url}) },
* function() { return $.ajax({url : second_url}) },
* function() { return $.ajax({url : another_url}) }
*).fail(function() {
* console.log(arguments)
*).done(function() {
* console.log(arguments)
*})
*
* @author Dmitry (dio) Levashov, dio@std42.ru
* @return jQuery.Deferred
*/
$.waterfall = function() {
var steps = [],
dfrd = $.Deferred(),
pointer = 0;
$.each(arguments, function(i, a) {
steps.push(function() {
var args = [].slice.apply(arguments), d;
if (typeof(a) == 'function') {
if (!((d = a.apply(null, args)) && d.promise)) {
d = $.Deferred()[d === false ? 'reject' : 'resolve'](d);
}
} else if (a && a.promise) {
d = a;
} else {
d = $.Deferred()[a === false ? 'reject' : 'resolve'](a);
}
d.fail(function() {
dfrd.reject.apply(dfrd, [].slice.apply(arguments));
})
.done(function(data) {
pointer++;
args.push(data);
pointer == steps.length
? dfrd.resolve.apply(dfrd, args)
: steps[pointer].apply(null, args);
});
});
});
steps.length ? steps[0]() : dfrd.resolve();
return dfrd;
}
})(jQuery);