MediaWiki:Vector.js

/* Any JavaScript here will be loaded for users using the Vector skin */

// This script only works in Vector right now, but the banner should degrade gracefully.
if (wgAction == 'view' && (wgPageName == 'Home' ||
                           wgPageName == 'Template:Main_Page_banner')) {
  var randomImages = [{image: '//wikimediadc.org/w/images/8/81/Background_1.jpg',
                       page: 'http://commons.wikimedia.org/wiki/File:President%27s_Park_with_White_House.jpg',
                       author: "Ad Meskens",
                       license: "CC-BY-SA 3.0"}];

  var randomImage = randomImages[Math.floor(Math.random() * randomImages.length)];

  var css = '#content {' +
            '  background-image: url(' + randomImage.image + ');' +
            '  background-size: 100%;' +
            '  background-repeat: no-repeat;' +
            '}' +
            '#main-page-banner {' +
            '  height: 12em;' +
            '  margin-bottom: 1em;' +
            '}' +
            '#main-page-welcome {' +
            '  text-shadow: #fff 0.3em 0.3em 1em, #fff -0.1em -0.1em 1em;' +
            '}' +
            '#main-page-credit {' +
            '  position: absolute; right: 0; top: -1em; font-size: 0.5em' +
            '}';
  var head = document.getElementsByTagName('head')[0];
  var style = document.createElement('style');

  style.type = 'text/css';
  if (style.styleSheet){
    style.styleSheet.cssText = css;
  } else {
    style.appendChild(document.createTextNode(css));
  }

  addOnloadHook(function() {
    var creditDiv = document.createElement('div');
    creditDiv.id = 'main-page-credit';
    var creditLink = document.createElement('a');
    creditLink.href = randomImage.page;
    creditLink.appendChild(document.createTextNode("Image: " + randomImage.author + ", " + randomImage.license));
    creditDiv.appendChild(creditLink);

    document.getElementById('mw-content-text').appendChild(creditDiv);
  });

  head.appendChild(style);
}