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August 29, 2015 14:02
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Playing with Object.observe ( try it in Canary here -> http://experiments.muditameta.com/objectObserve )
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| function Circle(r){ | |
| var self = this; | |
| var notifier = Object.getNotifier(this); | |
| Object.defineProperty(this, "radius", { | |
| get: function(){ | |
| return r; | |
| }, | |
| set: function(newR){ | |
| if (r === newR) | |
| return; | |
| r = newR; | |
| notifier.notify({ | |
| name: "radius", | |
| type: "radiusSet", | |
| newRadius: newR | |
| }); | |
| } | |
| }); | |
| Object.defineProperty(this, "area", { | |
| get: function(){ | |
| return Math.PI*Math.pow(r, 2); | |
| }, | |
| set: function(newA){ | |
| notifier.notify({ | |
| name: "area", | |
| type: "radiusChanged", | |
| newRadius: Math.sqrt(newA/Math.PI) | |
| }); | |
| } | |
| }); | |
| Object.defineProperty(this, "circum", { | |
| get: function(){ | |
| return 2*Math.PI*r; | |
| }, | |
| set: function(newC){ | |
| notifier.notify({ | |
| name: "circum", | |
| type: "radiusChanged", | |
| newRadius: newC / (2*Math.PI) | |
| }); | |
| } | |
| }); | |
| Object.observe(this, function(changeRecs){ | |
| self.radius = changeRecs[0].newRadius; | |
| }, ["radiusChanged"]); | |
| }; |
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| <html> | |
| <head> | |
| <style> | |
| input[type="text"] { | |
| display: block; | |
| margin: 10px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <label>Radius: | |
| <input type="text" name="radius" id="radius"> | |
| </label> | |
| <label>Circumference: | |
| <input type="text" name="circum" id="circum"> | |
| </label> | |
| <label>Area: | |
| <input type="text" name="area" id="area"> | |
| </label> | |
| <script src="./Circle.js" /> | |
| <script src="./main.js" /> | |
| </body> | |
| </html> |
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| window.onload = function(){ | |
| var c1 = new Circle(5); | |
| var rad = document.querySelector('#radius'); | |
| var circum = document.querySelector('#circum'); | |
| var area = document.querySelector('#area'); | |
| function update(){ | |
| rad.value = c1.radius; | |
| circum.value = c1.circum; | |
| area.value = c1.area; | |
| } | |
| [].forEach.call(document.querySelectorAll('input[type="text"]'), function(v){ | |
| v.addEventListener('keyup',function(e){ | |
| c1[e.target.id] = this.value; | |
| }); | |
| }); | |
| Object.observe(c1, function(){ | |
| update(); | |
| }, ["radiusSet"]); | |
| }; |
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