MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

var customizeToolbar = function () {
	/* Your code goes here */
$( '#wpTextbox1' ).wikiEditor( 'addToToolbar', {
	section: 'advanced',
	group: 'format',
	tools: {
		"math": {
			label: 'Math',
			type: 'button',
			icon: '//upload.wikimedia.org/wikipedia/commons/2/2e/Button_math.png',
			action: {
				type: 'encapsulate',
				options: {
					pre: "<math>",
					post: "</math>"
				}
			}
		}
	}
} );
};

/* Check if view is in edit mode and that the required modules are available. Then, customize the toolbar … */
if ( $.inArray( mw.config.get( 'wgAction' ), [ 'edit', 'submit' ] ) !== -1 ) {
	mw.loader.using( 'user.options' ).then( function () {
		// This can be the string "0" if the user disabled the preference ([[phab:T54542#555387]])
		if ( mw.user.options.get( 'usebetatoolbar' ) == 1 ) {
			$.when(
				mw.loader.using( 'ext.wikiEditor.toolbar' ), $.ready
			).then( customizeToolbar );
		}
	} );
}