perfect-scrollbar/src/js/lib/class.js

Minimalistic but perfect custom scrollbar plugin

/* Copyright (c) 2015 Hyunje Alex Jun and other contributors
 * Licensed under the MIT License
 */
'use strict';

function oldAdd(element, className) {
  var classes = element.className.split(' ');
  if (classes.indexOf(className) < 0) {
    classes.push(className);
  }
  element.className = classes.join(' ');
}

function oldRemove(element, className) {
  var classes = element.className.split(' ');
  var idx = classes.indexOf(className);
  if (idx >= 0) {
    classes.splice(idx, 1);
  }
  element.className = classes.join(' ');
}

exports.add = function (element, className) {
  if (element.classList) {
    element.classList.add(className);
  } else {
    oldAdd(element, className);
  }
};

exports.remove = function (element, className) {
  if (element.classList) {
    element.classList.remove(className);
  } else {
    oldRemove(element, className);
  }
};

exports.list = function (element) {
  if (element.classList) {
    return element.classList;
  } else {
    return element.className.split(' ');
  }
};