{
    "1": {
        "name": "Fresh"
    },
    "2": {
        "name": "Office"
    },
    "3": {
        "name": "Megamixes"
    }
}

    var request = Ti.Network.createHTTPClient();

    request.open("GET", url);

    request.onload = function()
    {
        var playlists = JSON.parse(this.responseText);

        Ti.Info("num playlists: " + playlists.length);
    };

3 Answers

• Accepted Answer

  Mathew, you are trying to get the length of an Object.
  Objects don't have length.
  Besides this , using numbers for object keys is not a good practice.

  You can fix this in 2 ways:

  1.the best solution

  Make your php to return something like

  data = [
      {"name":"Fresh"},
      {"name":"Office"},
      {"name":"Megamixes"}
  ]
  

  then you will have

  var playlists = JSON.parse(this.responseText);
  alert(playlist.data.length);
  

  2.The not so good way

  Keep the current structure but loop the object using the for…in loop. This is not goos because is slow so you better modify the server's reply.

  var playlists = JSON.parse(this.responseText);
  
  for (k in playlist) {
      Ti.API.info( playlist[k].name);
  }
  

• The JSON is not an array, so you cant get .length, try this format:

  {
      [
          "1": {
              "name": "Fresh"
          }
      ],
      [
          "2": {
              "name": "Office"
          }
      ],
      [
          "3": {
              "name": "Megamixes"
          }
      ]
  }
  

• playlists.length()