events - 重新渲染后，backbone.js 事件不会触发

Question

[编辑:我通过调用 delegateEvents() 解决了之前的问题，但不必这样做。重新发布并提供更多信息。]

我有一个 View ，渲染时其上有一个登录按钮，并附加了单击事件。首先渲染所有作品:单击按钮，成功调用 ajax 后，登录提示消失并显示欢迎 View (LoggedInView)。但是，如果我稍后导航回此 View (#foo)，UI 将呈现，但事件关联消失，而无需通过调用 delegateEents() 手动强制解决问题。

我的事件没有重新关联，这是怎么回事？

LoginView = Backbone.View.extend({
    template: _.template($("#loginTemplate").html()),
    initialize: function(stuff,router) {
        _.bindAll(this,'render','rc','gotProfile');
        this.model.bind("rc",this.rc)
        this.router = router;
    },
    events: {
        'click .loginButton': 'login'
    },  
    render: function() {
        $(this.el).html(this.template(this.model.toJSON()));
        $(this.el).find(".actionButton").button();  // Button
//      this.delegateEvents(this.events);  // NEEDED!  Re-wire events on re-render
        return this;
    },
    rc: function(code) {
        switch(code) {
            case errCodes.USER_NOT_FOUND:   this.notFound(); break;
            case errCodes.OK:               this.loginOk(); break;
            default:                            this.otherErr(); break;
        }
    },
    login: function() {
        clearErrors( $('[rel="req"]') );
        var okReq = validate( $('#login [rel="req"]'), validateReq );
        var okEmail = validate( [$('#uid')], validateEmail );
        if( okReq && okEmail ) {
            this.model.set({'uid':$('#uid').val().trim(),     'pwd':$('#pwd').val().trim()});
            this.model.fetch();
        }
    },
    notFound: function() {
        validate( [$('#uid'),$('#pwd')], function(){return[false,"Invalid user / password"]} );
    },
    otherErr: function() {
        validate( [$('#uid'),$('#pwd')], function(){return[false,"Please contact support for help logging in."]} );
    },
    loginOk: function() {
        this.profile = new Profile({uid:this.model.get('uid'),token:this.model.get('key')});
        this.profile.bind("rc",this.gotProfile)
        this.profile.fetch();
    },
    gotProfile: function() {
        this.router.navigate('/',true);
    }
});

LoggedInView = Backbone.View.extend({
    template: _.template($("#loggedInTemplate").html()),
    uList: new ProfileList(),
    initialize: function() {
        _.bindAll(this,'render','renderUserList','renderUser');
        this.model.bind('show', this.render);
        this.uList.bind('rc', this.render);
    },
    events: {
        'click #ufa': 'getUsersForHouse'
    },
    render: function() {
        $(this.el).html(this.template(this.model.toJSON()));
        this.renderUserList();
//      this.delegateEvents(this.events); // NEEDED!  Re-wire events on re-render
        return this;
    },
    renderUserList: function() {
        $(this.el).find('ul').empty();
        this.uList.each(this.renderUser);
    },
    renderUser: function(aUser) {
        $(this.el).find('#userList').append("<li>"+aUser.get('person').firstName+"</li>");
    },
    getUsersForHouse: function() {
        this.uList.fetch(this.model.get('token'),"house");
    }
});

Main = Backbone.Router.extend({
    routes: {
        'foo': 'foo',
        '*all': 'home'
    },
    initialize: function() {
        this.token = new Token();
        this.loginView = new LoginView({model:this.token},this);
    },
    foo: function(){  // naving here looses click event on login button
        $('#login').empty();
        $("#login").append(this.loginView.render().el);
    },
    home: function() {
        $('#login').empty();
        if( this.loginView.profile == null ) 
            $("#login").append(this.loginView.render().el);
        else {
            this.loggedInView = new LoggedInView({model:this.loginView.profile});
            $("#login").append(this.loggedInView.render().el);
        }
    }
});

Answer 1

您清空了#login div。正如 jQuery 文档所说:

To avoid memory leaks, jQuery removes other constructs such as data and event handlers from the child elements before removing the elements themselves.

因此，您实际上是从 View 中删除了事件。我更喜欢使用分离，因为它可以保留事件。 http://api.jquery.com/detach/

您可以在 View 中实现显示/隐藏来处理此问题。