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1// The Client ID obtained from the Google API Console. Replace with your own Client ID.
2var clientId = '*********-k826p6sl1qkhpnrtbbi0jktboijupvf9.apps.googleusercontent.com';
3
4// Scope to use to access user's photos.
5var scope = 'https://www.googleapis.com/auth/drive.readonly';
6
7var pickerApiLoaded = false;
8var oauthToken;
9
10// Use the API Loader script to load google.picker and gapi.auth.
11function onApiLoad() {
12    gapi.load('auth2', onAuthApiLoad);
13    gapi.load('picker', onPickerApiLoad);
14}
15
16function onAuthApiLoad() {
17    var authBtn = document.getElementById('GoogleDrive');
18    authBtn.disabled = false;
19    authBtn.addEventListener('click', function () {
20        gapi.auth2.authorize({
21            client_id: clientId,
22            scope: scope
23        }, handleAuthResult);
24    });
25}
26
27function onPickerApiLoad() {
28    pickerApiLoaded = true;
29    createPicker();
30}
31
32function handleAuthResult(authResult) {
33
34    if (authResult && !authResult.error) {
35        oauthToken = authResult.access_token;
36        createPicker();
37    }
38}
39
40// Create and render a Picker object for picking user Photos.
41function createPicker() {
42
43    if (pickerApiLoaded && oauthToken) {
44        var picker = new google.picker.PickerBuilder().
45            addView(google.picker.ViewId.PHOTOS).
46            setOAuthToken(oauthToken).
47            setDeveloperKey(developerKey).
48            setCallback(pickerCallback).
49            build();
50        picker.setVisible(true);
51    }
52
53}
54
55// A simple callback implementation.
56function pickerCallback(data) {
57    var url = 'nothing';
58    if (data[google.picker.Response.ACTION] == google.picker.Action.PICKED) {
59        var doc = data[google.picker.Response.DOCUMENTS][0];
60        url = doc[google.picker.Document.URL];
61    }
62    var message = 'You picked: ' + url;
63    document.getElementById('result').innerHTML = message;
64}
65	
66<script type="text/javascript" src="https://apis.google.com/js/api.js?onload=onApiLoad"></script>