react-sticky-state/dist/featureDetect.js

React StickyState Component makes native position:sticky statefull and polyfills the missing sticky browser feature

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var _canSticky = null;

var Can = function () {
  function Can() {
    _classCallCheck(this, Can);
  }

  _createClass(Can, null, [{
    key: 'sticky',
    get: function get() {
      if (_canSticky !== null) {
        return _canSticky;
      }

      if (typeof window !== 'undefined') {

        if (window.Modernizr && window.Modernizr.hasOwnProperty('csspositionsticky')) {
          return _canSticky = window.Modernizr.csspositionsticky;
        }

        var documentFragment = document.documentElement;
        var testEl = document.createElement('div');
        documentFragment.appendChild(testEl);
        var prefixedSticky = ['sticky', '-webkit-sticky'];

        _canSticky = false;

        for (var i = 0; i < prefixedSticky.length; i++) {
          testEl.style.position = prefixedSticky[i];
          _canSticky = !!window.getComputedStyle(testEl).position.match('sticky');
          if (_canSticky) {
            break;
          }
        }
        documentFragment.removeChild(testEl);
      }
      return _canSticky;
    }
  }]);

  return Can;
}();

exports.default = Can;
module.exports = exports['default'];