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| /* Takes a function that optionally returns a promise, and debounces it, returning a | |
| * promise to all callers. When the debounced function fulfills its promise or | |
| * returns a non-promise, all callers get the result. | |
| * Example: http://bit.ly/1btZC4f | |
| */ | |
| var debounce = function(func, wait, immediate) { | |
| var timeout; | |
| var deferred = $.Deferred(); | |
| return function() { | |
| var context = this, args = arguments; | |
| var later = function() { | |
| timeout = null; | |
| if (!immediate) { | |
| $.when(func.apply(context, args)) | |
| .then(deferred.resolve, deferred.reject, deferred.notify); | |
| deferred = $.Deferred(); | |
| } | |
| }; | |
| var callNow = immediate && !timeout; | |
| if (timeout) { | |
| clearTimeout(timeout); | |
| } | |
| timeout = setTimeout(later, wait); | |
| if (callNow) { | |
| deferred = $.Deferred(); | |
| $.when(func.apply(context, args)) | |
| .then(deferred.resolve, deferred.reject, deferred.notify); | |
| } | |
| return deferred.promise(); | |
| }; | |
| }; |
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Latest version with tests is at https://github.com/cwarden/promising-debounce