Assigning an array of objects within an AJAX request

I have a MediaObject object that includes:

  • a Media object
  • an array
  • and a function called getMedia()

When attempting to create a Media object and push it into the array inside the getMedia function after making an AJAX call, I encountered issues referencing the array. How should I properly reference it?

I have tried using both MediaObject.arrayList.push(mediaItem) and this.arrayList.push(mediaItem), but neither of them worked.

    function  MediaObject(){

            function Media(){
              this.id = "";
            }

            this.arrayList = [];

            AmebaObject.prototype.getMedia = function(){
              $.ajax({
                        url: this.rooturl+ this.loginurl,
                        type: 'GET',
                        headers: myheaders,
                        dataType: 'xml',
                        success: function (xml) {    
                             this.xml = xml;
                            $(xml).find("media").each(function(){
                               var mediaItem = new Media();
                               mediaItem.id = $(this).find('id').text();
                               MediaObject.arrayList.push(mediaItem);
                            });

                        },
                        error: function (xhr, textStatus, errorThrown) {
                            console.log("Status code : " + xhr.status);
                            console.log("Error: " + errorThrown);
                        }
                    });
            }

}

Error: Uncaught TypeError: Cannot call method 'push' of undefined

Answer №1

In order for the arrayList to be integrated into the MediaObject function, use the following code:

MediaObject.arrayList = [];

If you intend to access arrayList as a part of a MediaObject instance, you must adjust your reference within the success function.

Answer №2

It appears that there may be a misunderstanding in the usage of your MediaObject. At first glance, it seems like a constructor, but the way you are accessing MediaObject.arrayList implies it is a static property, which can be confusing.

Following user1329482's advice, you could utilize arrayList statically, with the caveat that it should be defined outside of the constructor to avoid resetting it for each new instance.

If your intention is to use it as an instance property, utilizing this is the only viable option. To access this within a callback's scope, you either need to define a local variable (often named var that = this) and access it accordingly, or employ the bind() method on your callback.

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