Utilizing Angular 2 for Integration of Google Calendar API

I recently attempted to integrate the Google Calendar API with Angular 2 in order to display upcoming events on a web application I am developing. Following the Google Calendar JavaScript quick-start tutorial, I successfully managed to set up the API, insert the client ID and API key into my code, and retrieve upcoming event information from a specific calendar.

For reference, you can find the quick-start tutorial here.

Although the JavaScript implementation worked flawlessly as expected, I encountered challenges while attempting to replicate the same functionality using Angular 2 components/services instead of raw JavaScript within an index.html script tag. The main issue I faced was related to errors indicating that "Cannot find name 'gapi'".

Upon loading the page where the code fetches Google Calendar data for the first time, these errors stating that gapi is undefined would appear. Despite multiple instances of gapi usage in various services responsible for authentication and retrieving event data, refreshing the page seemed to resolve the error and load the data without any issues.

In an attempt to overcome this problem, I tried including the necessary script tag in index.html using async:

<script src="https://apis.google.com/js/client.js?onload=checkAuth" async></script>

If you're facing a similar challenge, check out the repository at https://github.com/stefanreichert/angular2-google-calendar-example for guidance on resolving such issues.

javascriptangulartypescriptgoogle-apigoogle-calendar-api

Answer №1

The issue arose when attempting to fetch data from the Google Calendar API before completing the authentication process. A workaround involved using a separate promise to load the data only after successful authentication, allowing me to retrieve the desired event data.

Furthermore, I found it beneficial to include npm install --save @types/gapi, 

npm install --save @types/gapi.auth2
, and declare var gapi: any in order to use gapi for making calls within services or components.

Answer №2

There is a distinction between TypeScript and Javascript. TypeScript does not compile JS code; it only works with TypeScript syntax. When trying to use a global JS object in TypeScript, the compiler has no knowledge of it as it is only aware of TypeScript at compile time. To declare the global gapi, you can simply utilize a declare statement. Some developers opt for this approach by adding the following lines in their TypeScript files:

import { } from '..'

declare var gapi: any;

@Component({..})

Alternatively, installing typings is recommended as it adds global typing and enables compile-time checking for Google API:

npm install --save-dev @types/gapi

It may be necessary to restart the IDE after installing the typings for them to take effect.

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