假设我正在使用$http将变量加载到$scope中:
$http.get('/teachers/4').success(function(data){ $scope.teacher = data; });
我的模板使用这些数据:
Teacher: {{teacher.name}} <students-view students="teacher.students"></students-view>
该指令可以加载BEFORE老师完成加载,但我的指令的代码取决于正在加载的teacher.students数组:
app.directive('studentsView',function(){ return { scope: { students: '=' },controller: function($scope){ _.each($scope.students,function(s){ // this is not called if teacher loads after this directive }); } }; });
我如何得到我想要的行为?我不想停止使用$http,如果可能的话,我不想为范围分配承诺.
使用手表等待学生可用.一旦可用,您可以调用依赖它的代码,然后移除手表.如果您希望每次学生更改时执行代码,您都可以跳过删除手表.
app.directive('studentsView',link: function($scope){ var unwatch = $scope.$watch('students',function(newVal,oldVal){ // or $watchCollection if students is an array if (newVal) { init(); // remove the watcher unwatch(); } }); function init(){ _.each($scope.students,function(s){ // do stuff }); } } }; });