我的应用程序出现错误,不知道为什么。
Uncaught TypeError: Cannot call method 'on' of undefined
它发生在我的 Collection View 上,遵循代码:
App.WorkoutsView = Backbone.View.extend({
initialize: function(){
this.collection.on('add', this.addOne, this);
this.collection.on('reset', this.addAll, this);
},
render: function() {
this.addAll();
return this;
},
addAll: function() {
this.$el.empty();
this.collection.forEach(this.addOne, this);
},
addOne: function(Workout) {
var workoutView = new App.WorkoutView({model: App.Workout});
this.$el.append(workoutView.render().el);
}
});
问题在于:
this.collection.on('add', this.addOne, this);
谁知道为什么?
** 编辑:集合代码 **
App.WorkoutItems = Backbone.Collection.extend({
model: App.Workout,
url: '/workouts',
localStorage: function() {new Backbone.LocalStorage('Workout')},
initialize: function() {
this.on('remove', this.hideWorkout, this);
},
hideWorkout: function() {
model.trigger('hide');
},
focusOnWorkoutItem: function() {
var modelsToRemove = this.filter(function(workoutItem) {
return workoutItem.id != id;
});
this.remove(modelsToRemove);
}
});
编辑:我实例化 WorkoutsView 的路由器代码:
App.Router = Backbone.Router.extend({
routes: {
'':'index'
},
initialize: function() {
this.workoutItems = new App.WorkoutItems();
this.workoutsView = new App.WorkoutsView();
this.workoutsView.render();
},
index: function() {
$('#workouts').html(this.workoutsView.el);
this.workoutsItem.fetch();
}
});
new App.Router;
Backbone.history.start();
最佳答案
this.workoutsView = new App.WorkoutsView();
应该传入一个集合
this.workoutsView = new App.WorkoutsView({collection : this.workoutItems});
因为当您在 View 的 Initialize 方法中将事件绑定(bind)到它时,您的 View 在初始化时期望有一个可用的集合。
关于javascript - 未捕获的类型错误 : Cannot call method 'on' of undefined - Backbone. js,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16860749/