MediaWiki:Gadget-HelloWorld.js

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var HelloWorld = {

	init: function () {

		// Create a button using OOUI
		// Note! OOUI is being replaced by Codex
		var button = new OO.ui.ButtonWidget( { label: 'Click me!' } );

		// Bind events
		button.on( 'click', HelloWorld.sayHello );

		// Add the button to the DOM
		$( '.hello-world' ).html( button.$element );
	},

	sayHello: function () {
		alert( 'Hello world!' );
	}
};

mw.loader.using( [
	'oojs-ui-core'
], HelloWorld.init );