jmeas/prevent-scroll

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        define([], factory);
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        exports["preventScroll"] = factory();
    else
        root["preventScroll"] = factory();
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/* 0 */
/***/ function(module, exports) {

    'use strict';
    
    Object.defineProperty(exports, "__esModule", {
      value: true
    });
    var disabled = false;
    var currentPosition = void 0,
        currentOverflow = void 0,
        currentWidth = void 0;
    
    exports.default = {
      on: function on() {
        if (disabled) {
          return;
        }
    
        disabled = true;
    
        var htmlEl = document.querySelector('html');
        var body = document.body;
    
        // Determine the `scrollTop` to use. Some browsers require checking the
        // `body`, others use `html`.
        var bodyScrollTop = body.scrollTop;
        var htmlScrollTop = htmlEl.scrollTop;
        var scrollTop = bodyScrollTop ? bodyScrollTop : htmlScrollTop;
    
        // Store the current value of the htmlEl's styles – we're about to override
        // them.
        currentPosition = htmlEl.style.position;
        currentOverflow = htmlEl.style.overflowY;
        currentWidth = htmlEl.style.width;
    
        // Fixing the position of the `htmlEl` prevents the page from scrolling
        // at all.
        htmlEl.style.position = 'fixed';
        // Setting `overflowY` to `scroll` ensures that any scrollbars that are
        // around stick around. Otherwise, there would be a "jump" when the page
        // becomes unscrollable as the bar would vanish.
        htmlEl.style.overflowY = 'scroll';
        // This makes sure that the page doesn't collapse (usually your CSS will
        // prevent this, but it's best to be safe)
        htmlEl.style.width = '100%';
        // Scoot down the `htmlEl` to be in the same place that the user had
        // scrolled to.
        htmlEl.style.top = '-' + scrollTop + 'px';
      },
      off: function off() {
        if (!disabled) {
          return;
        }
    
        disabled = false;
    
        var htmlEl = document.querySelector('html');
        var body = document.body;
    
        // Reset `htmlEl` to the original styles.
        htmlEl.style.position = currentPosition;
        htmlEl.style.overflowY = currentOverflow;
        htmlEl.style.width = currentWidth;
    
        // Retrieve our original scrollTop from the htmlEl's top
        var scrollTop = -parseInt(htmlEl.style.top);
        // Return us to the original scroll position. Once again, we set this on
        // both the `body` and the `htmlEl` to be safe.
        htmlEl.scrollTop = scrollTop;
        body.scrollTop = scrollTop;
      }
    };

/***/ }
/******/ ])
});
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