codebuilt/styleswitcher.js at master · strangelights/codebuilt · GitHub

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function setActiveStyleSheet(title) {
    var i, a, main;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
      if (
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title")
      ) {
        a.disabled = true;
        if (a.getAttribute("title") == title) a.disabled = false;
      }
    }
  }

  function getActiveStyleSheet() {
    var i, a;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
      if (
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title") &&
        !a.disabled
      )
        return a.getAttribute("title");
    }
    return null;
  }

  function getPreferredStyleSheet() {
    var i, a;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
      if (
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("rel").indexOf("alt") == -1 &&
        a.getAttribute("title")
      )
        return a.getAttribute("title");
    }
    return null;
  }

  function createCookie(name, value, days) {
    if (days) {
      var date = new Date();
      date.setTime(date.getTime() + days * 24 * 60 * 60 * 1000);
      var expires = "; expires=" + date.toGMTString();
    } else expires = "";
    document.cookie = name + "=" + value + expires + "; path=/";
  }

  function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(";");
    for (var i = 0; i < ca.length; i++) {
      var c = ca[i];
      while (c.charAt(0) == " ") c = c.substring(1, c.length);
      if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
    return null;
  }

  window.onload = function(e) {
    var cookie = readCookie("style");
    var title = cookie ? cookie : getPreferredStyleSheet();
    setActiveStyleSheet(title);
  };

  window.onunload = function(e) {
    var title = getActiveStyleSheet();
    createCookie("style", title, 365);
  };

  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);