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plugin doc tweaks

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Hakim El Hattab 2019-04-03 10:49:14 +02:00 committed by GitHub
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README.md
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@ -1235,19 +1235,20 @@ Then:
## 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
Reveal.registerPlugin( 'myPlugin', {
let MyPlugin = {
init: () => new Promise( resolve => setTimeout( resolve, 3000 ) )
} );
};
Reveal.registerPlugin( 'myPlugin', MyPlugin );
Reveal.addEventListener( 'ready', () => console.log( 'Three seconds later...' ) );
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