Question

我有一个用户列表来自parse.com的抓取并由view呈现。一旦人们点击项目列表，我会在url中插入objectid。在路由器中我创建了一个函数“home”，它从集合和调用视图中获取渲染。函数“userdetails”捕获objectid以前在url中的视图插入并使用它来从集合中获取。问题是：如何将集合传递给此函数userdetails？我不想再进行另一次获取。

        home: function() {
       var self=this;
           console.log("inrouterhome");               
           var utenti = new Usercollection();
      utenti.fetch({
      success: function(object) {

    var page=new Homelistuser({model:object}); 
    self.changePage(page);

     },
     error: function(amici, error) {
// The collection could not be retrieved.
    }
    }); 


    },


 userDetails: function (objectId) {

     HERE I WANNA USE OBJECTID TO MAKE A GET FROM COLLECTION FETCHED IN HOME
  },

Answer 1

看起来这可能是一个范围问题。试试这个

var Models = {};
var AppRouter = Backbone.Router.extend({
home: function() {
       var self=this;
           console.log("inrouterhome");               
           Models.utenti = new Usercollection();
           Models.utenti.fetch({
           success: function(object) {

              var page=new Homelistuser({model:object}); 
              self.changePage(page);

           },
              error: function(amici, error) {


                 // The collection could not be retrieved.

            }
     });
  },
  userDetails: function (objectId) {

    //Models.utenti should exist as long as home came first,
    // may want to write a condition that check to see if it exists and if not do fetch.
  }

});

Answer 2

正如@abritez所提到的，这可能是一个范围问题，即userDetails方法无法访问实例化的集合。 @ abritez的解决方案可解决此问题，但如果用户刷新页面或直接访问路径，则不会加载该集合。

如果在两个路由之间使用集合，请考虑在运行时获取它并在准备就绪时使用侦听器：

var Models = {};
Models.utenti = new Usercollection();
Models.utenti.fetch();
var AppRouter = Backbone.Router.extend({
  home: function() {
    var utentiLoaded = function(object) {
      var page = new Homelistuser({model:object}); 
      this.changePage(page);
    }

    this.listenTo(Models.utenti, 'reset', utentiLoaded);
    this.listenTo(Models.utenti, 'error', function(amici, error) {
      // The collection could not be retrieved.
    });

    if (Models.utenti.any()) {
      utentiLoaded(Models.utenti);
    }
  },

  userDetails: function(objectId) {
    var utentiLoaded = function(object) {
    }

    this.listenTo(Models.utenti, 'reset', utentiLoaded);
    this.listenTo(Models.utenti, 'error', function(amici, error) {
      // The collection could not be retrieved.
    });

    if (Models.utenti.any()) {
      utentiLoaded(Models.utenti);
    }
  }
});

只获取一次收集

2 个答案: