我想首先使用Backbone.js呈现一个视图,该视图显示从服务器中提取的文章。然后,我想将此标记为“已查看”,并将未看到的消息计数返回给路由器,因为它需要可供其他视图使用。
所以在我的路由器中,我有:
getArticle: function (id) {
require(["app/models/article", "app/views/Article"], function (models, Article) {
var article = new models.Article({id: id});
article.fetch({
success: function (data) {
var articleView = new Article({model: data, message_count:that.message_count});
slider.slidePage(articleView.$el);
$.when(articleView.saveView()).done(function(data){
console.log('in when and data is ');
console.log(data);
});
},
error: function(){
console.log('failed to fecth artcie');
}
});
});
},
文章视图中的saveView()是:
saveView: function(){
var viewDetails = [];
viewDetails.device_id = this.options.device_id;
viewDetails.article_id = this.model.id;
viewDetails.project_title = project_title;
var article_view = new models.ArticleView();
article_view.save(viewDetails,
{
success: function(data) {
var count = data.get('count');
console.log('in saveView() success and count is ');
console.log(count);
return count;
},
error: function(model, xhr, options){
console.log(xhr.responseText);
},
});
},
这会命中REST API,记录文章的查看,然后返回一些看不见的文章。这导致控制台输出:
在何时和数据是router.js:286 undefined router.js:287 in saveView()的成功和计数是Article.js:45 4
因此,不知何故,$.when
无效,因为它不会在执行.done
脚本之前等待Ajax请求发送。有任何想法吗?
答案 0 :(得分:1)
您需要返回$.when
的jQuery Deferred
对象才能正常工作:
return article_view.save(viewDetails,
{
success: function(data) {
var count = data.get('count');
console.log('in saveView() success and count is ');
console.log(count);
return count;
},
error: function(model, xhr, options){
console.log(xhr.responseText);
},
});
Backbone' save()
方法returns a jqXHR
object,其行为与Deferred
对象的行为方式相同。如上所述,只需将回复链接起来。这应该$.when()
等待请求完成。