Backbone.js 应用程序不渲染视图

发布于 2024-12-18 08:40:40 字数 5055 浏览 0 评论 0原文

几天前我发现了backbone.js,我发现它是一个用于javascript开发的漂亮代码工具,尽管我的javascript技能不太好。 然而,在阅读文档后,我决定编写一个简单的联系人应用程序。 我将联系人数据保存在浏览器本地存储上。 这是代码 // 我的联系人应用程序的源代码

$(function() {


    //Contact Model
    Contact = Backbone.Model.extend({
        //Contact Defaults
        defaults : {
            first_name : 'First Name',
            last_name : 'Last Name',
            phone : 'Phone Number'
        },
        //Constructor(intialize)
        //Ensuring each contact has a first_name,last_name,phone
        intialize: function(){
            if(!this.get("first_name")) {
                this.set({"first_name":this.defaults.first_name});
            }
            if(!this.get("last_name")) {
                this.set({"last_name":this.defaults.last_name});
            }
            if(!this.get("phone")) {
                this.set({"phone":this.defaults.phone});
            }
        }
    });

    //Contact Collection

    //The collection is backed by localstorage
    ContactList = Backbone.Collection.extend({
        //Model
        model : Contact,
        //Save all contacts in localstorage under the namespace of "contacts"
        localStorage: new Store("contacts")
    });

    //Create global collection of Contacts
    Contacts = new ContactList;

    //Contact View
    ContactView = Backbone.View.extend({
        tagName : "li",

        template: _.template($("#item_template").html()),

        events : {
            "click span.contact-delete": "delete_contact"
        },
        intialize: function(){
            this.bind('change',this.render,this);
            this.bind('destroy',this.remove,this);
        },
        render: function() {
          $(this.el).html(this.template(this.model.toJSON()));
          this.setContent();
          return this;
        },
        setContent: function() {
            var first_name = this.model.get("first_name");
            var last_name = this.model.get("last_name");
            var phone = this.model.get("phone");
            var name = first_name+" "+last_name;
            this.$('.contact-name').html(name);
            this.$('.contact-phone').html(phone);
        },
        remove: function() {
              $(this.el).remove();
        },
        delete_contact: function() {
            this.model.destroy();
        }
    });

    //The Application
    AppView = Backbone.View.extend({

        el: $("#contact-app"),

        events : {
            "click #new-contact #save-button": "createContact"
        },
        intialize: function() {

            Contacts.bind("add", this.addOne, this);
            Contacts.bind("reset", this.addAll, this);          
            Contacts.fetch();
        },

        // Add a single contact item to the list by creating a view for it, and
        // appending its element to the `<ul>`.
        addOne: function(contact) {
          var view = new ContactView({model: contact});
          this.$("#contact-list").append(view.render().el);
        },
        // Add all items in the **Contacts** collection at once.
        addAll: function() {
          Contacts.each(this.addOne);
        },
        // Generate the attributes for a new Contact item.
        newAttributes: function() {
          return {
            first_name : this.$('#first_name').val(),
            last_name : this.$('#last_name').val(),
            phone : this.$('#phone').val()
          };
        },
        createContact: function() {
            Contacts.create(this.newAttributes());
            //Reset Form
            this.$('#first_name').val('');
            this.$('#last_name').val('');
            this.$('#phone').val('');
        }
    });

    // Finally,kick things off by creating the **App**.
     var App = new AppView;
});

这是我的 html 源

   <div id="contact-app">

        <div class="title">
            <h1>Contacts App</h1>
        </div>

        <div class="content">

            <div id="new-contact">
                <input name="first_name" placeholder="First Name" type="text" id="first_name"/>
                <input name="last_name" placeholder="Last Name" type="text" id="last_name" />
                <input name="phone" placeholder="Phone Number" type="text" id="phone" />
                <button id="save-button">Create Contact</button>
            </div>

            <div id="contacts">
                <ul id="contact-list">
                </ul>
            </div>

            <div id="contact-stats"></div>

        </div>

    </div>
    <script type="text/template" id="item_template">
    <div class="contact">
        <div class="contact-name"></div>
        <div class="contact-phone"><div>
        <span class="contact-delete"></span>
    </div>
  </script>

联系人数据保存在本地存储中,我可以通过 firebug 查看该数据,但视图未更新。我是backbone.js 的新手。 有什么问题吗,没有 JavaScript 错误。

I found backbone.js a couple of days ago, and i found out its a pretty code tool for javascript development though my javascript skill aren't great.
However after reading the documentation, i decided to code a simple contact app.
I save the contact data on browser localstorage.
This is code
// Source Code for my contacts app

$(function() {


    //Contact Model
    Contact = Backbone.Model.extend({
        //Contact Defaults
        defaults : {
            first_name : 'First Name',
            last_name : 'Last Name',
            phone : 'Phone Number'
        },
        //Constructor(intialize)
        //Ensuring each contact has a first_name,last_name,phone
        intialize: function(){
            if(!this.get("first_name")) {
                this.set({"first_name":this.defaults.first_name});
            }
            if(!this.get("last_name")) {
                this.set({"last_name":this.defaults.last_name});
            }
            if(!this.get("phone")) {
                this.set({"phone":this.defaults.phone});
            }
        }
    });

    //Contact Collection

    //The collection is backed by localstorage
    ContactList = Backbone.Collection.extend({
        //Model
        model : Contact,
        //Save all contacts in localstorage under the namespace of "contacts"
        localStorage: new Store("contacts")
    });

    //Create global collection of Contacts
    Contacts = new ContactList;

    //Contact View
    ContactView = Backbone.View.extend({
        tagName : "li",

        template: _.template($("#item_template").html()),

        events : {
            "click span.contact-delete": "delete_contact"
        },
        intialize: function(){
            this.bind('change',this.render,this);
            this.bind('destroy',this.remove,this);
        },
        render: function() {
          $(this.el).html(this.template(this.model.toJSON()));
          this.setContent();
          return this;
        },
        setContent: function() {
            var first_name = this.model.get("first_name");
            var last_name = this.model.get("last_name");
            var phone = this.model.get("phone");
            var name = first_name+" "+last_name;
            this.$('.contact-name').html(name);
            this.$('.contact-phone').html(phone);
        },
        remove: function() {
              $(this.el).remove();
        },
        delete_contact: function() {
            this.model.destroy();
        }
    });

    //The Application
    AppView = Backbone.View.extend({

        el: $("#contact-app"),

        events : {
            "click #new-contact #save-button": "createContact"
        },
        intialize: function() {

            Contacts.bind("add", this.addOne, this);
            Contacts.bind("reset", this.addAll, this);          
            Contacts.fetch();
        },

        // Add a single contact item to the list by creating a view for it, and
        // appending its element to the `<ul>`.
        addOne: function(contact) {
          var view = new ContactView({model: contact});
          this.$("#contact-list").append(view.render().el);
        },
        // Add all items in the **Contacts** collection at once.
        addAll: function() {
          Contacts.each(this.addOne);
        },
        // Generate the attributes for a new Contact item.
        newAttributes: function() {
          return {
            first_name : this.$('#first_name').val(),
            last_name : this.$('#last_name').val(),
            phone : this.$('#phone').val()
          };
        },
        createContact: function() {
            Contacts.create(this.newAttributes());
            //Reset Form
            this.$('#first_name').val('');
            this.$('#last_name').val('');
            this.$('#phone').val('');
        }
    });

    // Finally,kick things off by creating the **App**.
     var App = new AppView;
});

And this is my html source

   <div id="contact-app">

        <div class="title">
            <h1>Contacts App</h1>
        </div>

        <div class="content">

            <div id="new-contact">
                <input name="first_name" placeholder="First Name" type="text" id="first_name"/>
                <input name="last_name" placeholder="Last Name" type="text" id="last_name" />
                <input name="phone" placeholder="Phone Number" type="text" id="phone" />
                <button id="save-button">Create Contact</button>
            </div>

            <div id="contacts">
                <ul id="contact-list">
                </ul>
            </div>

            <div id="contact-stats"></div>

        </div>

    </div>
    <script type="text/template" id="item_template">
    <div class="contact">
        <div class="contact-name"></div>
        <div class="contact-phone"><div>
        <span class="contact-delete"></span>
    </div>
  </script>

The contact data gets saved in the local storage, which i can see via firebug but the view is not updated. Am new to backbone.js.
What is the problem, there are no javascript errors.

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评论(2

千秋岁 2024-12-25 08:40:40

尝试使用“add”而不是“create”将模型添加到集合中(我不认为“create”方法会触发“add”事件)。

而不是

    Contacts.create(this.newAttributes());

使用

   Contacts.add(this.newAttributes());

将模型保存到本地存储,您可以调用保存方法

addOne: function(contact) {

      var view = new ContactView({model: contact});
      contact.save();
      this.$("#contact-list").append(view.render().el);
    }, 

编辑:

另一件事是检查“初始化”方法的拼写,我认为它应该是“初始化”。

这是一个 jsFiddle,我没有将其保存到 jsfiddle 中的 localStorage 中,但这应该对你有用。

Try using "add" instead of 'create' for adding models to the collection (I don't think the 'add' event is being fired by the 'create' method).

Instead of

    Contacts.create(this.newAttributes());

Use

   Contacts.add(this.newAttributes());

To save the model to local storage you can call the save method

addOne: function(contact) {

      var view = new ContactView({model: contact});
      contact.save();
      this.$("#contact-list").append(view.render().el);
    }, 

EDIT:

Another thing check the spelling of your "intialize" method i think it should be "initialize".

Here's a jsFiddle, I'm not saving it to localStorage in the jsfiddle, but that should work by you.

动听の歌 2024-12-25 08:40:40

在模型上,defaults 应该处理默认值,initialize 函数可能不需要;如果我错了,有人纠正我。

在 ContactView 上,您可能需要在 initialize 方法中将渲染行更改为:

this.model.bind('change', _.bind(this.render, this));

On the model, the defaults should take care of the default values, the initialize functions are probably not needed; someone correct me on this if i'm wrong.

On your ContactView, you may have to change your render line to this in your initialize method:

this.model.bind('change', _.bind(this.render, this));
~没有更多了~
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