angularJS 自定义指令属性：require

示例展示一个指令的template中使用到了另一个指令的例子。

示例html:

<div ng-app="myApp">
    <div ng-controller="firstController">
        <div book-list></div>
    </div>
</div>

js:

angular.module('myApp',[])
    //定义第一个指令 bookList
    .directive('bookList',function(){
        return {
            restrict:'ECAM',controller:function($scope){
                $scope.books=[
                    {name:'PHP'},{name:'javascript'},{name:'java'}
                ];
                this.addBook=function(){
                    $scope.$apply(function(){
                        $scope.books.push({name:'Angularjs'});
                    });
                }
            },controllerAs:'bookListController',//这个template中使用了第二个指令bookAdd
            template:'<div><ul><li ng-repeat="book in books">{{ book.name }}</li></ul> <book-add></book-add> </div>',replace:true
        }
    })
    //定义第二个指令 bookAdd
    .directive('bookAdd',function(){
        return{
            restrict:'ECAM',require:'^bookList',template:'<button type="button">添加</button>',replace:true,link:function(scope,iElement,iAttrs,bookListController){  //这里引用了bookList指令
                iElement.on('click',bookListController.addBook);
            }
        }
    })
    .controller('firstController',['$scope',function($scope){
    }])

执行结果：

点击“添加”：

再点击“添加”两次：

示例中，在bookAdd指令中设置了 require : ' ^bookList ' ，指示该指令引用了bookList指令，^ 指示在父级元素查找bookList指令：

下面改进上面的例子，可以输入书名添加：

执行结果：

html和js:

<body>
<div ng-app="myApp">
    <div ng-controller="myCtrl">
        <book-list></book-list>
    </div>
</div>
<script>
    angular.module('myApp',[])
            .directive('bookList',function(){
                return {
                    restrict:'E',template:'<div><ul><li ng-repeat="book in books">{{ book.name }}</li></ul><book-add></book-add></div>',controller:function($scope){
                        $scope.books=[
                            {name:'book01'},{name:'book02'},{name:'book03'}
                        ];
                        this.addBook=function(name){
                            if(typeof(name)=='undefined' || name.length<1){alert('书名不可为空！');return;}
                            $scope.$apply(function(){
                                var exist=false;
                                angular.forEach($scope.books,function(ele,i){
                                    if(ele.name == name){
                                        exist=true;
                                        return;
                                    }
                                });
                                if(exist){alert('该书已经存在！')}else{
                                    $scope.books.push({name:name});
                                }
                            });
                        }
                    },controllerAs:'bookListController'
                }
            })
            .directive('bookAdd',template:'<div><input type="text" placeholder="书名" ng-model="newBookName"><button type="button">添加</button></div>',bookListController){
                        iElement.find('button').on('click',function(){
                            bookListController.addBook(scope.newBookName);
                        })
                    }
                }
            })
            .controller('myCtrl',function($scope){});
</script>
</body>

原文链接：https://www.f2er.com/angularjs/148672.html

angularJS 自定义指令 属性：require

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