我似乎无法获取正在加载到我的 FriendsCollection 中的 JSON 以呈现到 FriendListView 中。我可以看到它正在通过网络面板加载,我可以将数据记录到控制台,但由于某种原因,获取命令没有将数据传递到要呈现的 View 。
我正在使用 Backbone 1.0。
我正在使用的代码在 jsbin 上可用:http://jsbin.com/OHePaki/1/edit?html,js,output
// MODELS
var ArtifactModel = Backbone.Model.extend({
initialize: function() {
this.on('reset', function(){ artifactView.render() })
},
defaults: {
"text": "Unknown Text",
"timestamp": "Unknown timestamp"
}
});
var artifactModel = new ArtifactModel();
// COLLECTIONS
var ArtifactCollection = Backbone.Collection.extend({
model: ArtifactModel,
url: '/getDigest.json',
// url: 'http://we365.local/Artifact/GetShareableArtifact?token=b88d2640826bb8593f6edb308ce604f28225f240&artifact_id=2&social_site=tw&log_inside=&go',
parse: function(data) {
console.log('running parse');
return _.map(data.response.content, _.identity);
},
initialize: function(){
this.on('reset', function(){ artifactListView.render(); }),
console.log('running init function for ArtifactCollection');
this.fetch();
//this.reset(artifactjson, { parse: true });
console.log(this.toJSON());
}
});
var artifactCollection = new ArtifactCollection();
// VIEWS
var ArtifactView = Backbone.View.extend({
tagName: 'li',
className: 'single-model',
render: function(){
var template = Handlebars.compile($('#stream_getDigest').html());
this.$el.html(template(this.model.toJSON()));
return this;
}
});
var ArtifactListView = Backbone.View.extend({
initalize: function(){
this.collection.on('add', this.addOne, this);
},
render: function(){
this.collection.forEach(this.addOne, this);
},
addOne: function(artifactModel){
var artifactView = new ArtifactView({model: artifactModel});
this.$el.append(artifactView.render().el);
}
});
// rendering
var artifactView = new ArtifactView({model: artifactModel});
var artifactListView = new ArtifactListView({collection: artifactCollection});
artifactView.render();
artifactListView.render();
$('#list').html(artifactListView.$el.html());
最佳答案
默认情况下,jQuery ajax 调用是异步的,代码将继续运行而无需等待 .fetch()
完成。在您的代码中,view
在集合准备好之前呈现,因此 view
的数据为空。
您可以将 jQuery ajax 选项传递给 fetch
函数,这样您就可以执行以下操作 (http://backbonejs.org/#Collection-fetch):
...
initialize: function(){
this.on('reset', function(){ artifactListView.render(); }),
console.log('running init function for ArtifactCollection');
this.fetch({async:false});
console.log(this.toJSON()); //This will log the loaded collection
}
...
或者您可以更改抓取策略以利用异步加载:
this.fetch().done(function(){
//Things to do after collection is loaded
});
//this's not good to use in init function
关于javascript - 主干 - 将 JSON 加载到集合中不会在 View 中呈现,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18434477/