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AngularJS simple implementation
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| Input: <input type="text" ng-model="hello"><br> | |
| result: <span ng-bind="hello"></span> | |
| <script src="my-angular.js"></script> | |
| <script> | |
| angular | |
| .module('app', []) | |
| .controller('ctrl', function($scope){ | |
| // Set hello to 'nihao' | |
| $scope.hello = 'nihao'; | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| // Scope | |
| function Scope() { | |
| // Watch | |
| this.$$watchers = []; | |
| this.$watch = function(watcherFn, listenerFn) { | |
| this.$$watchers.push({ | |
| watcherFn: watcherFn, | |
| listenerFn: listenerFn | |
| }); | |
| }; | |
| // Digest | |
| this.$digest = function() { | |
| this.$$watchers.forEach(function(watcher) { | |
| var newValue = watcher.watcherFn(); | |
| var oldValue = watcher.last; | |
| if (newValue !== oldValue) { | |
| watcher.listenerFn(newValue, oldValue); | |
| watcher.last = newValue; | |
| } | |
| }); | |
| }; | |
| // Apply | |
| this.$apply = function(exprFn) { | |
| try { | |
| if (exprFn) { | |
| exprFn(); | |
| } | |
| } finally { | |
| this.$digest(); | |
| } | |
| }; | |
| this.$$directives = { | |
| 'ng-bind': function($scope, element, attrs) { | |
| var prop = element.attributes['ng-bind'].value; | |
| $scope.$watch(function() { | |
| return $scope[prop]; | |
| }, function(newValue, oldValue) { | |
| element.innerHTML = $scope[prop]; | |
| }); | |
| }, | |
| 'ng-model': function($scope, element, attrs) { | |
| var prop = element.attributes['ng-model'].value; | |
| $scope.$watch(function() { | |
| return $scope[prop]; | |
| }, function(newValue, oldValue) { | |
| element.addEventListener("keyup", function(){ | |
| $scope[prop] = element.value; | |
| $scope.$apply(); | |
| }); | |
| }); | |
| } | |
| }; | |
| // Compile | |
| this.$compile = function(element, $scope) { | |
| Array.prototype.forEach.call( | |
| element.children, | |
| function(child) { | |
| $scope.$compile(child, $scope); | |
| }); | |
| Array.prototype.forEach.call( | |
| element.attributes, | |
| function(attribute) { | |
| var directive = $scope.$$directives[attribute.name]; | |
| if (directive) { | |
| directive($scope, element, element.attributes); | |
| } | |
| }); | |
| }; | |
| this.$compile(document.body, this); | |
| this.$apply(); | |
| } | |
| function Controller (){ | |
| this.scope = new Scope(); | |
| } | |
| function Angular(){ | |
| this.module = function(name, requires){ | |
| return this; | |
| }; | |
| this.controllers = []; | |
| this.controller = function(name, ctrlFn){ | |
| var ctrl = new Controller(); | |
| ctrlFn(ctrl.scope); | |
| ctrl.scope.$apply(); | |
| this.controllers.push(ctrl); | |
| }; | |
| } | |
| window.angular = new Angular(); |
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