The following code returns an error in the chrome console:
Uncaught TypeError: Cannot read property 'children' of undefined
Initial error appeared 5 lines from last script close tag, and at a later point (currently), appears in line 38 of gapi.loaded_0
Combining these two code chunks https://developers.google.com/drive/v2/reference/children/list#examples and https://developers.google.com/drive/web/quickstart/quickstart-js#step_2_set_up_the_sample to get below to list children of a folder
<html>
<head>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<script type="text/javascript">
var CLIENT_ID = 'semi-secret-clientIdString.apps.googleusercontent.com';
var SCOPES = 'https://www.googleapis.com/auth/drive';
var thisFolderId = 'folderIdString';
/**
* Called when the client library is loaded to start the auth flow.
*/
function handleClientLoad() {
window.setTimeout(checkAuth, 1);
}
/**
* Check if the current user has authorized the application.
*/
function checkAuth() {
gapi.auth.authorize(
{'client_id': CLIENT_ID, 'scope': SCOPES, 'immediate': true},
handleAuthResult);
}
/**
* Called when authorization server replies.
*
* @param {Object} authResult Authorization result.
*/
function handleAuthResult(authResult) {
var authButton = document.getElementById('authorizeButton');
var lister = document.getElementById('Lister');
authButton.style.display = 'none';
lister.style.display = 'none';
if (authResult && !authResult.error) {
// Access token has been successfully retrieved, requests can be sent to the API.
lister.style.display = 'block';
lister.onchange = retrieveAllFilesInFolder(thisFolderId);
} else {
// No access token could be retrieved, show the button to start the authorization flow.
authButton.style.display = 'block';
authButton.onclick = function() {
gapi.auth.authorize(
{'client_id': CLIENT_ID, 'scope': SCOPES, 'immediate': false},
handleAuthResult);
};
}
}
///// Start retrieval function
function retrieveAllFilesInFolder(folderId,callback) {
var retrievePageOfChildren = function(request, result) {
request.execute(function(resp) {
result = result.concat(resp.items);
var nextPageToken = resp.nextPageToken;
if (nextPageToken) {
request = gapi.client.drive.children.list({
'folderId' : folderId,
'pageToken': nextPageToken
});
retrievePageOfChildren(request, result);
} else {
callback(result);
}
});
}
/*<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<error on the next line>>>>>>>>>>>>>>>>>>>>>*/
var initialRequest = gapi.client.drive.children.list({
'folderId' : folderId
});
retrievePageOfChildren(initialRequest, []);
}
/////
</script>
<script type="text/javascript" src="https://apis.google.com/js/client.js?onload=handleClientLoad"></script>
</head>
<body>
<input id="Lister" type="button" value="clickme" style="display: none" />
<input type="button" id="authorizeButton" style="display: none" value="Authorize" />
</body>
</html>
