Function isScrollable

src/main.js:142–167

(node)

                // we want to know if a given node has a scrollbar!
                // credit to lotif on http://stackoverflow.com/questions/4880381/check-whether-html-element-has-scrollbars
                var isScrollable = function(node) {
                    var cs;
                    var _notScrollable = {
                        vertical: false,
                        horizontal: false,
                    };
                    try {
                        cs = window.getComputedStyle(node);
                        if (cs === null) {
                            return _notScrollable;
                        }
                    } catch (e) {
                        /* istanbul ignore next: error handler */
                        return _notScrollable;
                    }
                    var overflowY = cs['overflow-y'];
                    var overflowX = cs['overflow-x'];
                    return {
                        vertical: (overflowY === 'scroll' || overflowY === 'auto') &&
                                    /* istanbul ignore next: not tested */
                                    node.scrollHeight > node.clientHeight,
                        horizontal: (overflowX === 'scroll' || overflowX === 'auto') &&
                                    /* istanbul ignore next: not tested */
                                    node.scrollWidth > node.clientWidth,
                    };
                };

                // getScrollTop
                //