@adobe/coral-spectrum/coral-externals/polyfills/classList-partial-shim.js

Coral Spectrum is a JavaScript library of Web Components following Spectrum design patterns.

/**
 * classList.js: Cross-browser full element.classList implementation.
 * 1.1.20150312
 *
 * By Eli Grey, http://eligrey.com
 * License: Dedicated to the public domain.
 * See https://github.com/eligrey/classList.js/blob/master/LICENSE.md
 */

// Source http://purl.eligrey.com/github/classList.js/blob/master/classList.js

(function () {
  var testElement = document.createElement("_");

  testElement.classList.add("c1", "c2");

  // Polyfill for IE 10/11 and Firefox <26, where classList.add and
  // classList.remove exist but support only one argument at a time.
  if (!testElement.classList.contains("c2")) {
    var createMethod = function (method) {
      var original = DOMTokenList.prototype[method];

      DOMTokenList.prototype[method] = function (token) {
        var i, len = arguments.length;

        for (i = 0 ; i < len ; i++) {
          token = arguments[i];
          original.call(this, token);
        }
      };
    };
    createMethod('add');
    createMethod('remove');
  }

  testElement.classList.toggle("c3", false);

  // Polyfill for IE 10 and Firefox <24, where classList.toggle does not
  // support the second argument.
  if (testElement.classList.contains("c3")) {
    var _toggle = DOMTokenList.prototype.toggle;

    DOMTokenList.prototype.toggle = function (token, force) {
      if (1 in arguments && !this.contains(token) === !force) {
        return force;
      } else {
        return _toggle.call(this, token);
      }
    };

  }

  // Polyfill for IE11 SVG classList support
  if (!("classList" in document.createElementNS("http://www.w3.org/2000/svg", "g"))) {
    var descr = Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'classList');
    Object.defineProperty(SVGElement.prototype, 'classList', descr);
  }

  testElement = null;
}());