javascript - 主干 View 事件绑定(bind)较晚

Question

我在 View 初始化时触发事件时遇到问题。如果我使用 setTimeout 调用该事件，则会触发该事件。但是，该事件不会在 View 初始化时触发。

/*global app */

define([
    'handlebars',
    'text!templates/achievements.html'
], function (Handlebars, AchievementsTemplate) {
"use strict";
var AchievementsView = Backbone.View.extend({

    achievementsTemplate: Handlebars.compile(AchievementsTemplate),

    initialize: function () {
        var el = this.render(this.model);
        this.$weekFilter = $(el).find(".challenge-nav li.open a");
        this.model.bind('change', this.resetFilters, this);
        this.resetFilters();
    },
    render: function (model) {
        this.$el.html(this.achievementsTemplate(model.toJSON()));
        return this.$el;
    },
    events: {
        "click .challenge-nav li a": "filterAchievements"
    },
    resetFilters: function () {
        this.$weekFilter.first().trigger("click");
    },
    filterAchievements: function (ev) {
        console.log("test");
    }
});
return AchievementsView;
});

上面没有调用resetFilters函数，但是如果我执行setTimeout，就会调用该函数。唯一的猜测是事件发生得很晚？有什么想法吗？

Hi All,

/*global app */

define([
    'handlebars',
    'text!templates/achievements.html'
], function (Handlebars, AchievementsTemplate) {
"use strict";
var AchievementsView = Backbone.View.extend({

    achievementsTemplate: Handlebars.compile(AchievementsTemplate),

    initialize: function () {
        var el = this.render(this.model);
        this.$weekFilter = $(el).find(".challenge-nav li.open a");
        this.model.bind('change', this.resetFilters, this);
        this.resetFilters();
    },
    render: function (model) {
        this.$el.html(this.achievementsTemplate(model.toJSON()));
        return this.$el;
    },
    events: {
        "click .challenge-nav li a": "filterAchievements"
    },
    resetFilters: function () {
        var self = this;
        setTimeout(function () {
            self.$weekFilter.first().trigger("click");
        },100);
    },
    filterAchievements: function (ev) {
        console.log("test");
    }
});
return AchievementsView;
});

Answer 1

如果 $weekFilter DOM 元素不是成就模板的一部分，因此当您初始化小部件时它位于 DOM 中，那么问题是所有事件初始化后被委托(delegate)。参见 Backbone 来源:http://backbonejs.org/docs/backbone.html#section-145 。

为什么不将 this.resetFilters() 移至 render()？