Created
October 27, 2009 02:53
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Maxime Haineault's jQuery delayed observer, with some improvements.
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/* | |
jQuery delayed observer | |
(c) 2007 - Maxime Haineault (max@centdessin.com) | |
Special thanks to Stephen Goguen & Tane Piper. | |
Slight modifications by Elliot Winkler | |
*/ | |
(function() { | |
var delayedObserverStack = []; | |
var observed; | |
function delayedObserverCallback(stackPos) { | |
observed = delayedObserverStack[stackPos]; | |
if (observed.timer) return; | |
observed.timer = setTimeout(function(){ | |
observed.timer = null; | |
observed.callback(observed.obj.val(), observed.obj); | |
}, observed.delay * 1000); | |
observed.oldVal = observed.obj.val(); | |
} | |
// going by | |
// <http://www.cambiaresearch.com/c4/702b8cd1-e5b0-42e6-83ac-25f0306e3e25/Javascript-Char-Codes-Key-Codes.aspx> | |
// I think these codes only work when using keyup or keydown | |
function isNonPrintableKey(event) { | |
var code = event.keyCode; | |
return ( | |
(event.metaKey || event.altKey || event.ctrlKey || event.shiftKey) || | |
(code == 8 || code == 9 || code <= 16 || (code >= 91 && code <= 93) || (code >= 112 && code <= 145)) | |
); | |
} | |
jQuery.fn.extend({ | |
delayedObserver:function(delay, callback){ | |
$this = $(this); | |
delayedObserverStack.push({ | |
obj: $this, timer: null, delay: delay, | |
oldVal: $this.val(), callback: callback | |
}); | |
stackPos = delayedObserverStack.length-1; | |
$this.keyup(function(event) { | |
if (isNonPrintableKey(event)) return; | |
observed = delayedObserverStack[stackPos]; | |
if (observed.obj.val() == observed.obj.oldVal) return; | |
else delayedObserverCallback(stackPos); | |
}); | |
} | |
}); | |
})(); |
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