Created
September 16, 2015 21:34
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Check for desired state at intervals.
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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)); | |
} | |
})(); | |
} | |
// Usage: ensure element is visible | |
poll( | |
function() { | |
return document.getElementById('lightbox').offsetWidth > 0; | |
}, | |
function() { | |
// Done, success callback | |
}, | |
function() { | |
// Error, failure callback | |
} | |
); |
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