title: How to retrieve value from callback response array in javascript
body: <p>I tried to take id file from callback response of google drive uploader. The code I use is like this:</p>
  
  <pre><code>function handleFileSelect(evt) {
             document.getElementById("info_upload").innerHTML = "Sedang memproses file untuk diupload...";
           evt.stopPropagation();
           evt.preventDefault();
           var files = evt.dataTransfer.files; // FileList object.
  
           var output = [];
           for (var i = 0, f; f = files[i]; i++) {
               var uploader = new MediaUploader({
                   file: f,
                   token: accessToken,
                   onComplete: function(data) {
                      document.getElementById('result').value = data['id'];
                   }
               });
               uploader.upload();
           }
         }
  </code></pre>
  
  <p>I've tried all the ways I know to take the id file but it's still not working. I have tried data.id or data[array index]. </p>
  
  <p>This is all of Callback response array value.</p>
  
  <pre><code>{
   "kind": "drive#file",
   "id": "1_EfEFzN4qppKGrcDK6T_SS5hdeAovFK-",
   "etag": "\"rOX0fJzgyZU36BYOEcGKIYxPCtI/MTUxMjU1MzQwMzA0Mw\"",
   "selfLink": "https://www.googleapis.com/drive/v2/files/1_EfEFzN4qppKGrcDK6T_SS5hdeAovFK-",
   "webContentLink": "https://drive.google.com/uc?id=1_EfEFzN4qppKGrcDK6T_SS5hdeAovFK-&amp;export=download",
   "alternateLink": "https://drive.google.com/file/d/1_EfEFzN4qppKGrcDK6T_SS5hdeAovFK-/view?usp=drivesdk",
   "embedLink": "https://drive.google.com/file/d/1_EfEFzN4qppKGrcDK6T_SS5hdeAovFK-/preview?usp=drivesdk",
   "iconLink": "https://drive-thirdparty.googleusercontent.com/16/type/image/png",
   "thumbnailLink": "https://lh5.googleusercontent.com/D_wWrHgdhRw6fnLaG0w2_nczIHxP1_gzD1-0N47_nlLZk2dXCLPP1GPj6SN37TQHNvvsG54zJSQ=s220",
   "title": "1.png",
   "mimeType": "image/png",
   "labels": {
    "starred": false,
    "hidden": false,
    "trashed": false,
    "restricted": false,
    "viewed": true
   },
   "createdDate": "2017-12-06T09:43:23.043Z",
   "modifiedDate": "2017-12-06T09:43:23.043Z",
   "modifiedByMeDate": "2017-12-06T09:43:23.043Z",
   "lastViewedByMeDate": "2017-12-06T09:43:23.043Z",
   "markedViewedByMeDate": "1970-01-01T00:00:00.000Z",
   "version": "2",
   "parents": [
    {
     "kind": "drive#parentReference",
     "id": "0ALL4ishr4YNbUk9PVA",
     "selfLink": "https://www.googleapis.com/drive/v2/files/1_EfEFzN4qppKGrcDK6T_SS5hdeAovFK-/parents/0ALL4ishr4YNbUk9PVA",
     "parentLink": "https://www.googleapis.com/drive/v2/files/0ALL4ishr4YNbUk9PVA",
     "isRoot": true
    }
   ],
   "downloadUrl": "https://doc-04-28-docs.googleusercontent.com/docs/securesc/faqhpav83cnunr53av2ik9r00tmicagg/7fvl938cmksp83dk43pp0oo5qiseh3sr/1512547200000/13075436128251877983/13075436128251877983/1_EfEFzN4qppKGrcDK6T_SS5hdeAovFK-?e=download&amp;gd=true",
   "userPermission": {
    "kind": "drive#permission",
    "etag": "\"rOX0fJzgyZU36BYOEcGKIYxPCtI/ZgAdmVNnouRC2sSB3efF5W7Fobk\"",
    "id": "me",
    "selfLink": "https://www.googleapis.com/drive/v2/files/1_EfEFzN4qppKGrcDK6T_SS5hdeAovFK-/permissions/me",
    "role": "owner",
    "type": "user"
   },
   "originalFilename": "1.png",
   "fileExtension": "png",
   "md5Checksum": "dd9b4aa37a7a35de368d73d002ba6bf9",
   "fileSize": "852232",
   "quotaBytesUsed": "852232",
   "ownerNames": [
    "Abdul Kahar"
   ],
   "owners": [
    {
     "kind": "drive#user",
     "displayName": "Abdul Kahar",
     "picture": {
      "url": "https://lh5.googleusercontent.com/-vsm5aHKmIJU/AAAAAAAAAAI/AAAAAAAAAY8/KIbhdHI1by4/s64/photo.jpg"
     },
     "isAuthenticatedUser": true,
     "permissionId": "13075436128251877983",
     "emailAddress": "abdulkaharumar@gmail.com"
    }
   ],
   "lastModifyingUserName": "Abdul Kahar",
   "lastModifyingUser": {
    "kind": "drive#user",
    "displayName": "Abdul Kahar",
    "picture": {
     "url": "https://lh5.googleusercontent.com/-vsm5aHKmIJU/AAAAAAAAAAI/AAAAAAAAAY8/KIbhdHI1by4/s64/photo.jpg"
    },
    "isAuthenticatedUser": true,
    "permissionId": "13075436128251877983",
    "emailAddress": "abdulkaharumar@gmail.com"
   },
   "capabilities": {
    "canCopy": true,
    "canEdit": true
   },
   "editable": true,
   "copyable": true,
   "writersCanShare": true,
   "shared": false,
   "explicitlyTrashed": false,
   "appDataContents": false,
   "headRevisionId": "0B7L4ishr4YNbRDRYRXZhVUJlM2VtSEh2ai9JVlR3NnFZbkJFPQ",
   "imageMediaMetadata": {
    "width": 1365,
    "height": 719,
    "rotation": 0
   },
   "spaces": [
    "drive"
   ]
  }
  </code></pre>
  
  <p>If I use data[0] then that appears only "{", the others such as data[1], data[2], and data[3] do not work.</p>