backbone.js - 获取模型数据到 View backbone.js

Question

我试图理解模型和 View 之间的关系。我试过构建一个模型和 View 来渲染该模型。

我收到错误 Cannot call method 'toJSON' of undefined我理解为模型的实际实例没有被发送到 View 。

我觉得 View 的初始化中缺少一些东西？

该模型:

var sticky = Backbone.Model.extend({

defaults: {
    title:"",
    content:"",
    created: new Date()

},

initialize: function() {
    console.log("sticky created!");

}

}); 

风景:

var stickyView = Backbone.View.extend({

tagName:"div",
className:"sticky-container",

initialize: function() {
    this.render();
    console.log("stickyView created!");
},

render: function() {
    $("#content-view").prepend(this.el);
    var data = this.model.toJSON(); // Error: Cannot call method 'toJSON' of undefined 
    console.log(data);
    var source = $("#sticky-template").html();
    var template = Handlebars.compile(source);
    $(this.el).html(template(data));
    return this;
}

});

创建 View 的新模型和新实例:

var Sticky = new sticky({title:"test"});

var StickyView = new stickyView();

Answer 1

您必须将模型实例传递给 View ，Backbone will do the rest :

constructor / initialize new View([options])
There are several special options that, if passed, will be attached directly to the view: model, collection, el, id, className, tagName and attributes.

这意味着你会像这样创建你的 View

var StickyView = new stickyView({model: Sticky});

当你在做的时候，你可以传递你编译的模板和你希望设置为 View 元素的 DOM 节点(并从 View 定义中删除 tagName 和 className)以避免严​​格耦合:

var stickyView = Backbone.View.extend({

    initialize: function(opts) {
        this.template = opts.template;
        this.render();
        console.log("stickyView created!");
    },

    render: function() {
        var data = this.model.toJSON();
        console.log(data);

        this.$el.html(this.template(data));

        return this;
    }

});

var StickyView = new stickyView({
    model: Sticky, 
    el: '#content-view',
    template: Handlebars.compile($("#sticky-template").html())
});