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Merge branch 'master' of github.com:hakimel/reveal.js into dev

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Hakim El Hattab 2019-04-03 10:49:22 +02:00
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@ -1235,19 +1235,20 @@ Then:
## Plugins ## Plugins
Plugins should be registered with reveal.js by calling `Reveal.registerPlugin( 'myPluginID', MyPlugin )`. Registered plugin instances should expose an "init" function that reveal.js can call to initialize them. Plugins should register themselves with reveal.js by calling `Reveal.registerPlugin( 'myPluginID', MyPlugin )`. Registered plugin instances can optionally expose an "init" function that reveal.js will call to initialize them.
When reveal.js is booted up via `Reveal.initialize()`, it will go through all registered plugins and invoke their "init" methods. If the "init" method returns a Promise, reveal.js will wait for that promise to be fullfilled before finshing the startup sequence and firing the [ready](#ready-event) event. Here's an example of a plugin that returns a promise: When reveal.js is booted up via `Reveal.initialize()`, it will go through all registered plugins and invoke their "init" methods. If the "init" method returns a Promise, reveal.js will wait for that promise to be fullfilled before finshing the startup sequence and firing the [ready](#ready-event) event. Here's an example of a plugin that does some asynchronous work before reveal.js can proceed:
```javascript ```javascript
Reveal.registerPlugin( 'myPlugin', { let MyPlugin = {
init: () => new Promise( resolve => setTimeout( resolve, 3000 ) ) init: () => new Promise( resolve => setTimeout( resolve, 3000 ) )
} ); };
Reveal.registerPlugin( 'myPlugin', MyPlugin );
Reveal.addEventListener( 'ready', () => console.log( 'Three seconds later...' ) ); Reveal.addEventListener( 'ready', () => console.log( 'Three seconds later...' ) );
Reveal.initialize(); Reveal.initialize();
``` ```
If the init method does _not_ return a Promise, it is considered ready right away and will not hold up the reveal.js startup sequence. If the init method does _not_ return a Promise, the plugin is considered ready right away and will not hold up the reveal.js startup sequence.
### Retrieving Plugins ### Retrieving Plugins