MediaWiki:Common.js

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// CSS
mw.loader.load('/wiki-iot/index.php?title=MediaWiki:Classification.css&action=raw&ctype=text/css', 'text/css');

// Javascript
mw.loader.load('/wiki-iot/index.php?title=MediaWiki:GradeCalculator.js&action=raw&ctype=text/javascript');
mw.loader.load('/wiki-iot/index.php?title=MediaWiki:MainPage.js&action=raw&ctype=text/javascript');

function colorGrade() {
  var gradeColors = {
    "A+": "green",
    A: "green",
    "A-": "green",
    B: "greenyellow",
    C: "yellow",
    D: "orange",
    F: "orangered",
  };
  for (elem of document.getElementsByClassName("grade")) {
    elem.style.backgroundColor = gradeColors[elem.innerText];
    elem.style.fontWeight = "bold";
    elem.style.textAlign = "center";
  }
}

$(colorGrade);