A js prototype with support for multiple onchange handlers

multipleOnChangeHandlers.js

function Widget(el) {
  	
}

Widget.prototype = {
	
	_onchangehandlers: [],
	_value: 0,
	
	set onchange(handler) {
		if(typeof handler === 'function') {
			this._onchangehandlers.push(handler);
			return this._onchangehandlers.length-1;
		} else {
			throw 'An onchange handler must be a function';
		}
	},
	
	get onchange () {
		return this._onchangehandlers;
	},
	
	_notify: function(e) {
		var i = 0,
			h = this._onchangehandlers,
			l = h.length;
		
		for(i;i<l;i++) {
			h[i](e);
		}
	},
	
	set value(val) {
		//Check to make sure value is valid and within range, throw exception if not
		
		this._value = val;
		this._notify({
			value: val
		});
	},
	
	get value() {
		return this._value;
	}
	
}