angularJS中controller与directive双向通信
一次工作中的机会,需要用到angularJS中控制器调用指令中的方法,于是把angularJS控制器与指令的通讯深入研究了一下,记载在此。
首先我们来看一下怎么在directive中调用controller的方法:
Index.html:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Angular Directive Call Controller Function</title> <script src="angular-1.3.0.js"></script> </head> <body ng-app="myApp"> <h1>Angular Directive Call Controller Function</h1> <div ng-controller="myController"> <my-directive on-button-click="directiveButtonClicked()" /> </div> <script src="script.js"></script> </body> </html>
Script.js:
var app = angular.module("myApp", []); app.controller("myController", function($scope) { $scope.directiveButtonClicked = function() { // Controller reacting to call initiated by directive alert('Button was clicked in directive'); } }); app.directive("myDirective", function() { return { restrict: 'E', template: '<button ng-click="buttonClicked();">Click Me</button>', scope: { onButtonClick: '&' }, link: link }; function link(scope, element, attrs, controller) { scope.buttonClicked = function() { // Button was clicked in the directive // Invoke callback function on the controller scope.onButtonClick(); } } });
首先,在controller中,有一个directiveButtonClicked方法,这个方法在点击button的时候被调用,而这个button则是出现在directive中的。其实仔细看代码就知道,这个方法是通过属性传给了directive,所以这个通讯其实没有什么特别的。
但是在controller中调用directive的方法就没这么简单了。看代码:
Index.html:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Angular Controller Call Directive Function</title> <script src="angular-1.3.0.js"></script> </head> <body ng-app="myApp"> <h1>Angular Controller Call Directive Function</h1> <div ng-controller="myController"> <my-directive accessor="accessor" ></my-directive> <button ng-click="callDirective();">Get Data</button> </div> <script src="script.js"></script> </body> </html>
Script.js:
var app = angular.module("myApp", []); app.controller("myController", function($scope) { $scope.accessor = {}; $scope.callDirective = function() { if($scope.accessor.getData) { var data = $scope.accessor.getData(); alert('Data from directive: ' + JSON.stringify(data)); } } }); app.directive("myDirective", function() { return { restrict: 'E', template: 'Name: <input type="text" ng-model="name" /><br />Credit: <input type="text" ng-model="credit" /><br />', scope: { accessor: '=' }, link: link }; function link(scope, element, attrs, controller) { if(scope.accessor) { scope.accessor.getData = function() { return { name: scope.name, credit: scope.credit } } } } });
仔细看代码,其实在directive中有一个叫做accessor的属性,而它正是controller中的东西,相当于在directive中开了一个口子,然后把controller的一个东西注入进去了,这样,controller就能够调用directive中的任何东西了。
这两个例子相信在今后的工作中对我会有非常大的帮助。
什么时候开始都不晚,晚的是,你总是不敢开始。