Created
June 14, 2015 05:28
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poll
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| function poll(fn, callback, errback, timeout, interval) { | |
| var endTime = Number(new Date()) + (timeout || 2000); | |
| interval = interval || 100; | |
| (function p() { | |
| // If the condition is met, we're done! | |
| if(fn()) { | |
| callback(); | |
| } | |
| // If the condition isn't met but the timeout hasn't elapsed, go again | |
| else if (Number(new Date()) < endTime) { | |
| setTimeout(p, interval); | |
| } | |
| // Didn't match and too much time, reject! | |
| else { | |
| errback(new Error('timed out for ' + fn + ': ' + arguments)); | |
| } | |
| })(); | |
| } |
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| // Usage: ensure element is visible | |
| poll( | |
| function() { | |
| return document.getElementById('lightbox').offsetWidth > 0; | |
| }, | |
| function() { | |
| // Done, success callback | |
| }, | |
| function() { | |
| // Error, failure callback | |
| } | |
| ); | |
| //http://davidwalsh.name/essential-javascript-functions |
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