63 lines
1.8 KiB
JavaScript
63 lines
1.8 KiB
JavaScript
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(function($) {
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/**
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* Runs functions given in arguments in series, each functions passing their results to the next one.
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* Return jQuery Deferred object.
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*
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* @example
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* $.waterfall(
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* function() { return $.ajax({url : first_url}) },
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* function() { return $.ajax({url : second_url}) },
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* function() { return $.ajax({url : another_url}) }
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*).fail(function() {
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* console.log(arguments)
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*).done(function() {
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* console.log(arguments)
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*})
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*
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* @example2
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* event_chain = [];
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* event_chain.push(function() { var deferred = $.Deferred(); deferred.resolve(); return deferred; });
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* $.waterfall.apply(this, event_chain).fail(function(){}).done(function(){});
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*
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* @author Dmitry (dio) Levashov, dio@std42.ru
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* @return jQuery.Deferred
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*/
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$.waterfall = function() {
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var steps = [],
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dfrd = $.Deferred(),
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pointer = 0;
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$.each(arguments, function(i, a) {
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steps.push(function() {
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var args = [].slice.apply(arguments), d;
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if (typeof(a) == 'function') {
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if (!((d = a.apply(null, args)) && d.promise)) {
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d = $.Deferred()[d === false ? 'reject' : 'resolve'](d);
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}
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} else if (a && a.promise) {
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d = a;
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} else {
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d = $.Deferred()[a === false ? 'reject' : 'resolve'](a);
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}
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d.fail(function() {
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dfrd.reject.apply(dfrd, [].slice.apply(arguments));
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})
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.done(function(data) {
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pointer++;
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args.push(data);
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pointer == steps.length
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? dfrd.resolve.apply(dfrd, args)
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: steps[pointer].apply(null, args);
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});
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});
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});
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steps.length ? steps[0]() : dfrd.resolve();
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return dfrd;
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}
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})(jQuery);
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