Javascript 尝试Backbone.js时,我的集合对象不';t加载数据
我使用的是Backbone.js,服务器部分是使用Jax RS用Java编写的Rest服务 我从服务器得到的响应如下:Javascript 尝试Backbone.js时,我的集合对象不';t加载数据,javascript,backbone.js,Javascript,Backbone.js,我使用的是Backbone.js,服务器部分是使用Jax RS用Java编写的Rest服务 我从服务器得到的响应如下: { "student":[ {"collegeName":"Hollywood Inc.","id":"12","name":"Jim Carry","salary":"100"}, {"collegeName":"Hollywood Inc.","id":"13","name":"Nicholas Cage","salary":"400"},
{
"student":[
{"collegeName":"Hollywood Inc.","id":"12","name":"Jim Carry","salary":"100"},
{"collegeName":"Hollywood Inc.","id":"13","name":"Nicholas Cage","salary":"400"},
{"collegeName":"Hollywood Inc.","id":"14","name":"Edi Murphy","salary":"567"},
{"collegeName":"Hollywood Inc.","id":"15","name":"Will Smith","salary":"500"},
{"collegeName":"Hollywood Inc.","id":"16","name":"Jack Nicholsan","salary":"234"}
]
}
现在我的客户端backbone.js代码如下:
var fn01 = function(){
try{
window.Student = Backbone.Model.extend();
window.StudentCollection = Backbone.Collection.extend({
model: Student,
url: "http://localhost:8081/rest/firstRest/demo/get",
parse: function(response){
var studentArray = new Array();
_.each(response.student,function(std){
(function(student){
studentArray.push(new Student({id: student.id, name: student.name}));
})(std);
});
this.models = studentArray;
return this.models;
}
});
window.StudentListView = Backbone.View.extend({
tagName: "ul",
initialize: function(){
this.model.on("reset",this.render,this);
},
render: function(evt){
_.each(this.model.models, function(student){
$(this.el).append(new StudentListItemView({model: student}).render().el);
},this);
return this;
}
});
window.StudentListItemView = Backbone.View.extend({
tagName: "li",
template: _.template($("#tpl-student-list-item").html()),
render: function(evt){
$(this.el).html(this.template(this.model.toJSON()));
return this;
}
});
var AppRouter = Backbone.Router.extend({
routes:{
"":"list"
},
list: function(){
this.studentList = new StudentCollection();
this.studentListView = new StudentListView({model: this.studentList});
this.studentList.fetch();
$("#sidebar").html(this.studentListView.render().el);
}
});
var app = new AppRouter();
Backbone.history.start();
}catch(e){
alert(" ERROR "+e);
}
}
onLoadFn(fn01);
我得到的响应是学生的json对象,
这里我尝试做的是在页面加载时从服务器获取学生并将其存储在StudentCollection对象中。
studentCollection对象有一个属性“models”,它提供一个Student对象数组
但在我的例子中,studentCollection对象的models属性是空数组
因此,我在StudentCollection中添加了一个方法parse,并显式地将模型分配给array
但我的studentList.models仍然是一个[]即空数组
有人能告诉我哪里出了问题吗?一种方法可能是,您可以在
dom
中指定ul
,例如:
<div id="sidebar">
<ul></ul>
</div>
和StudentListView为:
window.StudentListView = Backbone.View.extend({
// change tagName to el
el: "#sidebar ul",
// ... existing code
});
而批准人
为:
var AppRouter = Backbone.Router.extend({
// ... existing code
list: function(){
this.studentList = new StudentCollection();
this.studentListView = new StudentListView({collection: this.studentList});
this.studentList.fetch();
}
});
var AppRouter = Backbone.Router.extend({
// ... existing code
list: function(){
// ... existing code
var _this = this;
this.studentList.fetch({
success: function() {
$("#sidebar").html(_this.studentListView.render().el);
},
error: function() {
}
});
}
});
另一种方法是,不要将集合的reset
事件绑定为:
window.StudentListView = Backbone.View.extend({
// ... existing code
initialize: function(){
// this.model.on("reset",this.render,this); .. don't bind this event
},
});
和批准者为:
var AppRouter = Backbone.Router.extend({
// ... existing code
list: function(){
this.studentList = new StudentCollection();
this.studentListView = new StudentListView({collection: this.studentList});
this.studentList.fetch();
}
});
var AppRouter = Backbone.Router.extend({
// ... existing code
list: function(){
// ... existing code
var _this = this;
this.studentList.fetch({
success: function() {
$("#sidebar").html(_this.studentListView.render().el);
},
error: function() {
}
});
}
});
为什么不在集合的
parse
方法中返回response.student
?将根据解析的返回值生成模型。而且无需在批准程序中执行$(“#侧栏”).html(this.studentListView.render().el)
。StudentListView
中指定的#侧栏
和标记名ul
是否相同?#侧栏是一个div,我试图在div中创建ul和li,以便显示学生列表。如果将集合
命名为集合,而不是模型
,则更容易理解。如果您直接从外部调用呈现
,那么它就无法在学生列表视图
中绑定集合的重置
事件。应用程序初始化时,dom
中存在哪些元素?学生列表