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该代码每次都有效，除非第一次调用路由器并加载页面。，集合已创建，但未填充notes.fetch();. 我一直在寻找，我不明白为什么会发生这种情况。

例如，当我转到 URL 加载此页面时，除了集合中的内容之外的所有内容都会加载。当我进入#blank/' and then go "Back" to the列表视图时，集合和模型会按预期加载。那么如何在页面加载后加载集合？

这是代码：

$(function() {

    // Note: The model and collection are extended from TastypieModel and TastypieCollection
    // to handle the parsing and URLs

    window.Note = TastypieModel.extend({});

    window.Notes = TastypieCollection.extend({
        model: Note,
        url: NOTES_API_URL
    });

    window.notes = new Notes();

    window.NoteView = Backbone.View.extend({

        className: "panel panel-default note",
        template: _.template($('#notes-item').html()),
        events: {
            'click .note .edit': 'editNoteToggle',
            'click .note .edit-note': 'doEdit'
        },
        initialize: function () {
            _.bindAll(this, 'render');
            this.model.bind('change', this.render);
        },
        render: function() {
            this.$el.html(this.template(this.model.toJSON()));
            return this;
        },
        editNoteToggle: function() {
            console.log("I've toggled the edit box");
        },
        doEdit: function() {
            console.log('This will edit the note');
        }
    });

    window.NoteListView = Backbone.View.extend({

        el: "#app",
        template: _.template($('#notes-item-list').html()),
        events: {
            'click #add-note': 'addNote'
        },
        initialize: function () {
            _.bindAll(this, 'render', 'addNote');
            this.collection.bind('change', this.render);
        },
        render: function() {
            this.$el.html(this.template());
            console.log('before the loop');
            console.log(this.collection.toJSON()); //<- Empty when it first loads, then contains the models when I visit another page and come "back" to this page
            this.collection.each(function(note){
                var view = new NoteView({ model: note });
                $('#notes-list').append(view.render().el);
            });
            console.log('done');
            $('#add-note-toggle').on('click', this, function() {
                $('#note-add-form').toggle();
            });
            return this;
        },
        addNote: function() {
            console.log('The add note was clicked');
        }
    });

    window.NotesRouter = Backbone.Router.extend({
        routes: {
            '': 'list',
            'blank/': 'blank'
        },
        initialize: function() {
            // starts by assigning the collection to a variable so that it can load the collection
            this.notesView = new NoteListView({
                collection: notes
            });
            notes.fetch();
        },
        list: function () {
            $('#app').empty();
            $('#app').append(this.notesView.render().el);
        },
        blank: function() {
            $('#app').empty();
            $('#app').text('Another view');
        }
    });

    window.notesRouter = new NotesRouter();
    Backbone.history.start();
})
4

1 回答 1

1

看起来你听错了收集事件。尝试使用

window.NoteListView = Backbone.View.extend({
    // ...
    initialize: function () {
        this.collection.bind('reset', this.render);
    }
    // ...
});
window.NotesRouter = Backbone.Router.extend({
    // ...
    initialize: function() {
        notes.fetch({reset: true});
    }
    // ...
});

现在你正在启动一个 async collection.fetch()，它最终会加载数据。问题是，一旦将数据加载到集合中，它就不会触发change事件，只会触发一堆adds。当您转到空白页面并返回时，您的数据已通过第二次render调用到达并正确显示。

如果你修改你fetch()的抛出一个reset事件然后监听它，一旦数据进入，你将拥有一个新呈现的 NoteList，而无需转到空白页面。

于 2013-10-22T20:29:25.063 回答