MediaWiki:Gadget-Checkbox.js

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const Checkbox = {

	init: function ( $content ) {
		$content.find( '.template-checkbox' ).on( 'click', Checkbox.toggle );
	},

	toggle: function () {
		const checkbox = this;
		if ( checkbox.textContent ) {
			checkbox.textContent = '';
		} else {
			checkbox.textContent = '✓';
		}
	}
};

mw.hook( 'wikipage.content' ).add( Checkbox.init );