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Created January 28, 2017 12:00
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Complete Google Drive File Picker example
Raw
1_README.md

Google Drive File Picker Example

This is an example of how to use the Google Drive file picker and Google Drive API to retrieve files from Google Drive using pure JavaScript. At the time of writing (14th July 2013), Google have good examples for using these two APIs separately, but no documentation on using them together.

Note that this is just sample code, designed to be concise to demonstrate the API. In a production environment, you should include more error handling.

See a demo at http://stuff.dan.cx/js/filepicker/google/

Usage

  1. Get a Google Drive API key (refer to Google's Quickstart guide for instructions).
  2. Replace PUT_YOUR_API_KEY_HERE with your API key (listed under "Key for browser apps" in Google's API console)
  3. Replace PUT_YOUR_NUMERIC_CLIENT_ID_HERE with the numeric portion of your OAuth2 client ID (xxxxxxxxxx.apps.googleusercontent.com)
  4. Test out the code to ensure it works
  5. Replcae the onSelect method with your own code

References

Licence

(The MIT licence)

Copyright (C) 2013 Daniel Lo Nigro (Daniel15)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Raw
filepicker.htm
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Google Drive File Picker Example</title>
</head>
<body>
<button type="button" id="pick">Pick File</button>
<script src="filepicker.js"></script>
<script>
function initPicker() {
var picker = new FilePicker({
apiKey: 'PUT_YOUR_API_KEY_HERE',
clientId: PUT_YOUR_NUMERIC_CLIENT_ID_HERE,
buttonEl: document.getElementById('pick'),
onSelect: function(file) {
console.log(file);
alert('Selected ' + file.title);
}
});
}
</script>
<script src="https://www.google.com/jsapi?key=PUT_YOUR_API_KEY_HERE"></script>
<script src="https://apis.google.com/js/client.js?onload=initPicker"></script>
</body>
</html>
Raw
filepicker.js
/**!
* Google Drive File Picker Example
* By Daniel Lo Nigro (http://dan.cx/)
*/
(function() {
/**
* Initialise a Google Driver file picker
*/
var FilePicker = window.FilePicker = function(options) {
// Config
this.apiKey = options.apiKey;
this.clientId = options.clientId;
// Elements
this.buttonEl = options.buttonEl;
// Events
this.onSelect = options.onSelect;
this.buttonEl.addEventListener('click', this.open.bind(this));
// Disable the button until the API loads, as it won't work properly until then.
this.buttonEl.disabled = true;
// Load the drive API
gapi.client.setApiKey(this.apiKey);
gapi.client.load('drive', 'v2', this._driveApiLoaded.bind(this));
google.load('picker', '1', { callback: this._pickerApiLoaded.bind(this) });
}
FilePicker.prototype = {
/**
* Open the file picker.
*/
open: function() {
// Check if the user has already authenticated
var token = gapi.auth.getToken();
if (token) {
this._showPicker();
} else {
// The user has not yet authenticated with Google
// We need to do the authentication before displaying the Drive picker.
this._doAuth(false, function() { this._showPicker(); }.bind(this));
}
},
/**
* Show the file picker once authentication has been done.
* @private
*/
_showPicker: function() {
var accessToken = gapi.auth.getToken().access_token;
this.picker = new google.picker.PickerBuilder().
addView(google.picker.ViewId.DOCUMENTS).
setAppId(this.clientId).
setOAuthToken(accessToken).
setCallback(this._pickerCallback.bind(this)).
build().
setVisible(true);
},
/**
* Called when a file has been selected in the Google Drive file picker.
* @private
*/
_pickerCallback: function(data) {
if (data[google.picker.Response.ACTION] == google.picker.Action.PICKED) {
var file = data[google.picker.Response.DOCUMENTS][0],
id = file[google.picker.Document.ID],
request = gapi.client.drive.files.get({
fileId: id
});
request.execute(this._fileGetCallback.bind(this));
}
},
/**
* Called when file details have been retrieved from Google Drive.
* @private
*/
_fileGetCallback: function(file) {
if (this.onSelect) {
this.onSelect(file);
}
},
/**
* Called when the Google Drive file picker API has finished loading.
* @private
*/
_pickerApiLoaded: function() {
this.buttonEl.disabled = false;
},
/**
* Called when the Google Drive API has finished loading.
* @private
*/
_driveApiLoaded: function() {
this._doAuth(true);
},
/**
* Authenticate with Google Drive via the Google JavaScript API.
* @private
*/
_doAuth: function(immediate, callback) {
gapi.auth.authorize({
client_id: this.clientId + '.apps.googleusercontent.com',
scope: 'https://www.googleapis.com/auth/drive.readonly',
immediate: immediate
}, callback);
}
};
}());
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