backbone - 未在选定元素上触发的事件已更改

时间:2016-08-08 09:37:42

标签: javascript jquery backbone.js

我从Backbone.View生成一个下拉列表 将它附加到DOM后,不会触发更改事件。 delegateEvents没有修复它。有人能告诉我盲点在哪里吗?

模型和集合:

App.Models.DictionaryItem = Backbone.Model.extend({
        default: {
            key: '',
            value: '', id: 0
        }
    });

    App.Collections.Dictionary = Backbone.Collection.extend({
        model: App.Models.DictionaryItem,
        initialize: function (models, options) {

        },
        parse: function (data) {
            _.each(data, function (item) {
             //   if(item){
                var m = new App.Models.DictionaryItem({ key: item.code, value: item.name });
                this.add(m);
           // }
            }, this);
        }
    });

查看:

App.Views.ItemView = Backbone.View.extend({
        tagName: 'option',
        attributes: function () {
            return {
                value: this.model.get('key')
            }
        },
        initialize: function () {
            this.template = _.template(this.model.get('value'));
        },
        render: function () {
            this.$el.html(this.template());
            return this;
        }
    });

    App.Views.CollectionView = Backbone.View.extend({
        tagName: 'select',
        attributes: {
            'class': 'rangesList'
        },
        events: {
            'change .rangesList': 'onRangeChanged'
        },
        initialize: function (coll) {
            this.collection = coll;
        },
        render: function () {
            _.each(this.collection.models, function (item) {
                this.$el.append(new App.Views.ItemView({ model: item }).render().el);
            }, this);
           // this.delegateEvents(this.events);
            return this;
        },
        selected: function () {
            return this.$el.val();
        },
        onRangeChanged: function () {
            alert('changed');
        }
    });

渲染:

var coll = new App.Collections.Dictionary(someData, { parse: true });
var v= new App.Views.CollectionView(coll);
var vv=v.render().el;

//   new App.Views.CollectionView(coll).render().el;
$('body').append(vv)

1 个答案:

答案 0 :(得分:1)

tagName上的attributesCollectionView

tagName: 'select',
attributes: {
    'class': 'rangesList'
},

el将为<select class="rangesList">。但是你的events

events: {
    'change .rangesList': 'onRangeChanged'
},

正在视图'change'内的.rangesList 内部监听el个事件。来自fine manual

  

事件以{"event selector": "callback"}格式编写。 [...]省略选择器会导致事件绑定到视图的根元素(this.el)。

所以你试图从不存在的事物中侦听事件。如果您想直接从视图el收听事件,请忽略选择器:

events: {
    'change': 'onRangeChanged'
}