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object.watch polyfill in ES5
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| // Cross-browser object.watch and object.unwatch | |
| // object.watch | |
| if (!Object.prototype.watch) { | |
| Object.prototype.watch = function (prop, handler) { | |
| var oldval = this[prop], newval = oldval, | |
| getter = function () { | |
| return newval; | |
| }, | |
| setter = function (val) { | |
| oldval = newval; | |
| return newval = handler.call(this, prop, oldval, val); | |
| }; | |
| if (delete this[prop]) { // can't watch constants | |
| if (Object.defineProperty) { // ECMAScript 5 | |
| Object.defineProperty(this, prop, { | |
| get: getter, | |
| set: setter, | |
| enumerable: false, | |
| configurable: true | |
| }); | |
| } else if (Object.prototype.__defineGetter__ && Object.prototype.__defineSetter__) { // legacy | |
| Object.prototype.__defineGetter__.call(this, prop, getter); | |
| Object.prototype.__defineSetter__.call(this, prop, setter); | |
| } | |
| } | |
| }; | |
| } | |
| // object.unwatch | |
| if (!Object.prototype.unwatch) { | |
| Object.prototype.unwatch = function (prop) { | |
| var val = this[prop]; | |
| delete this[prop]; // remove accessors | |
| this[prop] = val; | |
| }; | |
| } |
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