I'm experiencing difficulties with displaying a list of accessible calendars from Google Calendar using the Google API. I am utilizing JavaScript and AJAX to achieve this. What specific methods do I need to implement? I have only come across event-related methods so far, but not one for displaying the calendar descriptions. Thank you for your assistance!
If you're looking to create a basic working prototype, you can refer to the step-by-step guide provided on the Google Calendar API webpage
The sample code includes a function named listUpcomingEvents() that retrieves events from the main calendar. To obtain a list of all available calendars, you can leverage the following approach:
function getCalendars()
{
var request = gapi.client.calendar.calendarList.list();
request.execute(function(response){
var allCalendars = response.items;
console.log(allCalendars);
});
}
Check out the code snippet I recently created:
kb.loadAsync('https://apis.google.com/js/client.js', 'onload', 'gapi').then(gapi => {
gapi.auth.authorize({
client_id: __GOOGLE_CALENDAR_API_KEY__,
scope: 'https://www.googleapis.com/auth/calendar',
immediate: true,
}, authResult => {
if(authResult && !authResult.error) {
gapi.client.load('calendar','v3', () => {
gapi.client.calendar.calendarList.list({
maxResults: 250,
minAccessRole: 'writer',
}).execute(calendarListResponse => {
let calendars = calendarListResponse.items;
console.log(calendars.map(cal => cal.summary));
});
});
} else {
console.log('unauthorized');
}
});
});
The kb.loadAsync function that you see in action is what I built for loading Google APIs asynchronously. Here's its definition:
/**
* A utility function for asynchronous loading of Google APIs.
*
* @param {string} source
* @param {string} callbackParam
* @param {string=} globalName
* @returns {Promise}
*/
export function loadAsync(source, callbackParam, globalName) {
return new Promise((resolve,reject) => {
let callbackFunc = Math.random().toString(36);
window[callbackFunc] = () => {
resolve(window[globalName]);
delete window[callbackFunc];
};
let sep = source.includes('?') ? '&' : '?';
$script(`${source}${sep}${encodeURIComponent(callbackParam)}=${encodeURIComponent(callbackFunc)}`);
});
}
This function uses scriptjs. However, scriptjs' callback triggers too early as Google loads additional data after downloading client.js, requiring us to use Google's onload parameter for proper functionality.
If you prefer using a bunch of <script> tags, you can avoid these dependencies. Nevertheless, async functions offer a cleaner solution for me.
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