MediaWiki:Gadget-HelloWorld.js
From Angelina Jordan Wiki
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mw.loader.using( 'mediawiki.util', function () {
mw.util.addPortletLink(
'p-personal',
'#',
'Say hello',
'pt-hello',
'Click to say hello'
).addEventListener('click', function (e) {
e.preventDefault();
alert('Hello world!');
});
});
