Ember - Abort ajax请求

Question

我想知道如何中止请求.

例如,我发布App.MyModel.find(),后来我想在从服务器返回之前取消/中止它.我希望这样的事情:

var res = App.MyModel.find();   //request sent to server
res.abort();                    // abort the request before completion

但这不起作用 - 返回的对象是a promise,既没有abort也没有cancel方法.

澄清

我正在寻找如何abort在底层XMLHttpRequest对象上调用该方法.

Answer 1

对于那些想知道如何做的人,这里是我实现取消jquery ajax请求的方法.

首先,我在我的Application store中定义了一个新方法,它将在我的自定义RESTAdapter上调用cancelQuery.

App.Store = DS.Store.extend({
  cancelQuery: function(type){
    var adapter = this.adapterFor(this.modelFor(type).modelName);
    if(typeof adapter.cancelQuery === 'function'){
      adapter.cancelQuery();
    }
  }
});

在我的自定义RESTAdapter中,我定义了这个新函数并重写ajaxOptions,如下所示:

App.YOURMODELAdapter = DS.RESTAdapter.extend({
  jqXHRs: [],
  ajaxOptions: function(url, type, hash) {
    // Get default AjaxOptions
    var ajaxOptions = this._super(url, type, hash);

    // If the function was defined in the DS.RESTAdapter object,
    // we must call it in out new beforeSend hook.
    var defaultBeforeSend = function(){};
    if(typeof ajaxOptions.beforeSend === 'function'){
      defaultBeforeSend = ajaxOptions.beforeSend;
    }
    ajaxOptions.beforeSend = function(jqXHR, settings){
      defaultBeforeSend(jqXHR, settings);
      this.jqXHRs.push(jqXHR); // Keep the jqXHR somewhere.
      var lastInsertIndex = this.jqXHRs.length - 1;
      jqXHR.always(function(){
        // Destroy the jqXHRs because the call is finished and 
        // we don't need it anymore.
        this.jqXHRs.splice(lastInsertIndex,1);
      });
    };

    return ajaxOptions;
  },
  // The function we call from the store.
  cancelQuery: function(){
    for(var i = 0; i < this.jqXHRs.length; i++){
      this.jqXHRs[i].abort();
    }
  }
});

现在,您可以cancelQuery在控制器的上下文中调用.

this.store.cancelQuery('yourmodel');