@danielkalen/simplybind/src/misc/helpers/webkitDomDescriptorFix.coffee

Magically simple, framework-less one-way/two-way data binding for frontend/backend in ~5kb.

###*
 * There is a bug in webkit/blink engines in which native attributes/properties 
 * of DOM elements are not exposed on the element's prototype and instead is
 * exposed directly on the element instance; when looking up the property descriptor
 * of the element a data descriptor is returned instead of an accessor descriptor
 * (i.e. descriptor with getter/setter) which means we are not able to define our
 * own proxy getter/setters. This was fixed only in April 2015 in Chrome v43 and
 * Safari v10. Although we won't be able to get notified when the objects get
 * their values set, we would at least provide working functionality lacking update
 * listeners. Since v1.14.0 HTMLInputElement::value bindings invoke the original
 * getter and setter methods in Binding::setValue(), and since we want to avoid
 * increasing the amount of logic present in Binding::setValue() for performance
 * reasons, we patch those setters here. We clone the target element and check for
 * the existence of the target property - if it exists then it indicates the target
 * property is a native property (since only native properties are copied over in
 * Element::cloneNode). This patching is only for native properties.
 *
 * https://bugs.webkit.org/show_bug.cgi?id=49739
 * https://bugs.webkit.org/show_bug.cgi?id=75297
 * https://bugs.chromium.org/p/chromium/issues/detail?id=43394
 * https://bugs.chromium.org/p/chromium/issues/detail?id=431492
 * https://bugs.chromium.org/p/chromium/issues/detail?id=13175
 * https://developers.google.com/web/updates/2015/04/DOM-attributes-now-on-the-prototype-chain
###

if requiresDomDescriptorFix and _.isDom and _.property of object.cloneNode(false)
	_.origDescriptor = shouldWriteLiveProp = false
	_.isLiveProp = true
	_.origGetter = ()-> _.object[_.property]
	_.origSetter = (newValue)-> _.object[_.property] = newValue