ES6 Model

Developer
Josh Beckwith
Size
3,244 Kb
Views
28,336
  1. ES6 Model Previews
  2. ES6 Model HTML Codes
  3. ES6 Model JS Codes

How do I make an es6 model?

The javascript gods have pulled the rug out from under me. Object.observe is now deprecated, and I need a simple model that will dispatch change events. This is it.. What is a es6 model? How do you make a es6 model? This script and codes were developed by Josh Beckwith on 29 August 2022, Monday.

ES6 Model Previews
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ES6 Model - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>ES6 Model</title>
</head>
<body> <h1>Nothing to see here... check out the js!</h1> <script src='https://cdn.rawgit.com/Olical/EventEmitter/master/EventEmitter.min.js'></script> <script src="js/index.js"></script>
</body>
</html>

ES6 Model - Script Codes JS Codes

'use strict';
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
/* Simple model that supports shallow property change watchers
*/
var Model = function (_EventEmitter) {	_inherits(Model, _EventEmitter);	function Model(obj) {	_classCallCheck(this, Model);	var _this = _possibleConstructorReturn(this, _EventEmitter.call(this));	_this._properties = Object.assign({}, obj); // clone just to be safe	Object.keys(_this._properties).forEach(function (key) {	_this.define(key, _this._properties[key]);	});	return _this;	}	Model.prototype.toJSON = function toJSON() {	return this._properties;	};	Model.prototype.define = function define(key, defaultValue) {	this._properties[key] = defaultValue;	Object.defineProperty(this, key, {	get: function get() {	return this._properties[key];	},	set: function set(newValue) {	// ignore if value is unchanged	// only works for primitives	if (newValue === this._properties[key]) return;	var oldValue = this._properties[key];	this._properties[key] = newValue;	model.emit(key, newValue, oldValue, key);	},	enumerable: true	});	};	return Model;
}(EventEmitter);
/* usage
*/
var model = new Model({	str: 'hello',	obj: {	a: 'a' // NOTE: unwatchable	},	subModel: new Model({	a: 'a' // watchable	}),	bool: true,	num: 123.4567,	arr: [1, 2, 3, 4, 5]
});
console.log(model);
var onChange = function onChange(newval, oldval, key) {	console.log(key, 'newval: ' + newval + ', oldval: ' + oldval);
};
model.on('str', onChange);
model.str = 'asdf';
model.str += 'asdf';
model.subModel.on('a', onChange);
model.subModel.a = 'A';
model.on('arr', onChange);
model.arr = model.arr.concat('extra');
ES6 Model - Script Codes
ES6 Model - Script Codes
Home Page Home
Developer Josh Beckwith
Username positlabs
Uploaded August 29, 2022
Rating 3
Size 3,244 Kb
Views 28,336
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