javascript Backbone：将模型添加到集合并渲染视图
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Backbone: Adding a model to Collection and render a View
提问by swayziak
I'm building a simple Backbone app where I mainly have a view with a list of books (book name + cover image) and another view where I want to add new books to the list.
我正在构建一个简单的 Backbone 应用程序，其中我主要有一个包含书籍列表（书籍名称 + 封面图片）的视图和另一个我想将新书籍添加到列表中的视图。
When I use a sample data the view with the books renders properly, but when I try to add books to the list it doesn't work and I don't know which is the problem.
当我使用示例数据时，书籍视图会正确呈现，但是当我尝试将书籍添加到列表中时，它不起作用，我不知道问题出在哪里。
Here is the JSFiddle http://jsfiddle.net/swayziak/DRCXf/4/and my code:
这是 JSFiddle http://jsfiddle.net/swayziak/DRCXf/4/和我的代码：
HTML:
HTML：
<section class="menu">
<ul class="footer">
<li><a href="">List of Books</a></li>
<li><a href="#edit">Edit</a></li>
<li><a href="#about">About</a></li>
</ul>
</section>
<section class="feed"></section>
<script id="bookTemplate" type="text/template">
<img src="<%= image %>"/>
<h2 class="bookTitle"><%= title %><h2>
</script>
<script id="aboutTemplate" type="text/template"> About </script>
<script id="editTemplate" type="text/template">
<form id="addBook" action="#">
<label for="title">Book Title</label><input type="text" id="title">
<label for="image">Image Link</label><input type="text"/ id="image">
<button id="add-book">Button</button>
</form>
</script>
</div>
And the Backbone code:
和主干代码：
app = {};
// Sample Data
// 样本数据
var books = [
{title:'Imperial Bedrooms', image:'http://upload.wikimedia.org/wikipedia/en/thumb/e/e8/Imperial_bedrooms_cover.JPG/200px-Imperial_bedrooms_cover.JPG
},
{title:'Less than zero',
image:'http://d.gr-assets.com/books/1282271923l/9915.jpg'
},
];
];
//Router
//路由器
app.Router = Backbone.Router.extend({
routes: {
'' : 'home',
'about' : 'about',
'edit' : 'edit',
},
home: function () {
if(!this.bookListView){
this.bookListView = new app.BookListView(books);
}else{
this.bookListView.render();
}
},
about: function () {
if (!this.aboutView) {
this.aboutView = new app.AboutView();
}
$('.feed').html(this.aboutView.render().el);
},
edit: function () {
if (!this.editView) {
this.editView = new app.EditView();
);
$('.feed').html(this.editView.render().el);
}
});
// Model
// 模型
app.Book = Backbone.Model.extend({
defaults: {
title:'',
image:'',
}
});
// Collection
// 收藏
app.BookList = Backbone.Collection.extend ({
model: app.Book
});
// Book View
// 书本视图
app.BookView = Backbone.View.extend ({
tagName: 'div',
className: 'book',
template: _.template( $( '#bookTemplate' ).html()),
render: function() {
this.$el.html(this.template(this.model.toJSON()));
return this;
}
});
// List of Books View
// 书籍列表视图
app.BookListView = Backbone.View.extend({
el: '.feed',
initialize: function ( initialBooks ) {
this.collection = new app.BookList (initialBooks);
this.render();
this.listenTo( this.collection, 'add', this.renderBook );
},
render: function() {
this.$el.empty();
this.collection.each(function( item ){
this.renderBook( item );
}, this);
},
renderBook: function ( item ) {
var bookview = new app.BookView ({
model: item
});
this.$el.append( bookview.render().el );
}
});
// Add books view
// 添加书籍视图
app.EditView = Backbone.View.extend({
tagName: 'div',
className: 'edit',
template: _.template( $( '#editTemplate' ).html()),
events:{
"click #add-book":"addBook"
},
addBook:function(e){
e.preventDefault();
var title = this.$el.find("#title").val();
var image = this.$el.find("#image").val();
var bookModel = new app.Book({title:"title",image:'image'});
},
render: function () {
this.$el.html(this.template());
return this;
}
});
// About View
// 关于视图
app.AboutView = Backbone.View.extend({
tagName: 'div',
className: 'about',
template: _.template( $( '#aboutTemplate' ).html()),
render: function () {
this.$el.html(this.template());
return this;
}
});
});
});
var router = new app.Router();
Backbone.history.start();
I think the problem is related with the Home router, the app.BookListView and the app.EditView, but I'm not sure of that.
我认为问题与家庭路由器、app.BookListView 和 app.EditView 有关，但我不确定。
Any help is welcomed.
欢迎任何帮助。
Thanks.
谢谢。
回答by fbynite
In this example..for simplicity's sake, define a global books collection.
在这个例子中..为了简单起见，定义一个全局书籍集合。
app.books = new app.BookList(books);
app.books = new app.BookList(books);
Pass your books collection to editView & BookListView in your router:
将您的书籍收藏传递给路由器中的 editView 和 BookListView：
home: function () {
if(!this.bookListView) {
this.bookListView = new app.BookListView({collection:app.books});
}
else {
this.bookListView.render();
}
},
edit: function () {
if (!this.editView)
this.editView = new app.EditView({collection:app.books}); // your book collection
$('.feed').html(this.editView.render().el);
}
In you editView you need to make a few changes to your addBookfunction:
在您的 editView 中，您需要对您的addBook功能进行一些更改：
app.EditView = Backbone.View.extend({
// your other code above
addBook:function(e){
e.preventDefault();
var title = this.$el.find("#title").val(); //could use: this.$('#title').val()
var image = this.$el.find("#image").val();
// remove quotes to pass variables
var bookModel = new app.Book({title:title,image:image});
// this.collection is app.books, your book collection.
// this will trigger the add event in your BookListView.
this.collection.add(bookModel);
},
});
In your BookListViewmake the following changes to the initializefunction:
在您BookListView对initialize函数进行以下更改时：
app.BookListView = Backbone.View.extend({
initialize: function() {
this.render();
this.listenTo( this.collection, 'add', this.renderBook );
},
Here is a fiddle with the changes: http://jsfiddle.net/9R9zU/
这是更改的小提琴：http: //jsfiddle.net/9R9zU/
