Prototype and Ajax.Request Region

Question

I'm having trouble getting the correct scope in the prototype of the Ajax.Request class. What I'm trying to do is write a simple API that wraps ajax requests:

API = Class.create({

  initialize:function(api_token)
  {
    this.api_token = api_token;
    this.request_uri = new Template('/api/#{api_token}/#{resource}.json');
    this.status = 0;
    this.last_result = null;
  },

  some_api_call:function()
  {
    var result = this._request('resource', {'id':1});
    // and so on...
  },

  _request:function(resource, params)
  {
    var uri = this.request_uri.evaluate({"api_token":this.api_token,"resource":resource});
    new Ajax.Request(uri,
    {
      contentType:'application/json',
      method:'get',
      parameters:params,
      onSuccess:function(r)
      {
        alert(this);
        this.last_result = r.responseJSON;
        this.status = r.status;
      }
    });    
    return this.last_result;
  }

});

When I am in the onSuccess () method, I expected + this + to refer to the parent object, but it gives me DOMWindow. It seems I can not get the response data in the API class at all. I suppose this is something stupid (mandatory?), But I just can't think about it right now.

thanks

Answer 1

. . , , . , . :

_request:function(resource, params)
{
  var uri = this.request_uri.evaluate({"api_token":this.api_token,"resource":resource});
  new Ajax.Request(uri,
  {
    asynchronous: false,
    contentType:'application/json',
    method:'get',
    parameters:params,
    onSuccess:function(r)
    {
      this.last_result = r.responseJSON;
      this.status = r.status;
    }.bind(this)
  });    

  alert(this.status);

  return this.last_result;
}

Answer 2

?

, 'this':

 _request:function(resource, params)
    {
      var uri = this.request_uri.evaluate({"api_token":this.api_token,"resource":resource});
      var last_result = "";
      var status = "";
      new Ajax.Request(uri,
      {
        asynchronous: false,
        contentType:'application/json',
        method:'get',
        parameters:params,
        onSuccess:function(r)
        {
          last_result = r.responseJSON;
          status = r.status;
        }
      });  
      this.last_result = last_result;
      this.status = status;  
      alert(this.status);
      return this.last_result;
    }