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Filename : sticky-header.js
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/*
* HeadsUp 1.5.6
* @author Kyle Foster (@hkfoster)
* @license MIT
*/
; (function (window, document, undefined) {

    'use strict';

    // Extend function
    function extend(a, b) {
        for (var key in b) {
            if (b.hasOwnProperty(key)) {
                a[key] = b[key];
            }
        }
        return a;
    }

    // Throttle function (https://bit.ly/1eJxOqL)
    function throttle(fn, threshhold, scope) {
        threshhold || (threshhold = 250);
        var previous, deferTimer;
        return function () {
            var context = scope || this,
                current = Date.now(),
                args = arguments;
            if (previous && current < previous + threshhold) {
                clearTimeout(deferTimer);
                deferTimer = setTimeout(function () {
                    previous = current;
                    fn.apply(context, args);
                }, threshhold);
            } else {
                previous = current;
                fn.apply(context, args);
            }
        };
    }

    // Class management functions
    function classReg(className) {
        return new RegExp('(^|\\s+)' + className + '(\\s+|$)');
    }

    function hasClass(el, cl) {
        return classReg(cl).test(el.className);
    }

    function addClass(el, cl) {
        if (!hasClass(el, cl)) {
            el.className = el.className + ' ' + cl;
        }
    }

    function removeClass(el, cl) {
        el.className = el.className.replace(classReg(cl), ' ');
    }

    // Main function definition
    function headsUp(selector, options) {
        this.selector = document.querySelector(selector);
        this.options = extend(this.defaults, options);
        this.init();
    }

    // Overridable defaults
    headsUp.prototype = {
        defaults: {
            delay: 300,
            sensitivity: 20
        },

        // Init function
        init: function (selector) {

            var self = this,
                options = self.options,
                selector = self.selector,
                oldScrollY = 0,
                winHeight;

            // Resize handler function
            function resizeHandler() {
                winHeight = window.innerHeight;
                return winHeight;
            }

            // Scroll handler function
            function scrollHandler() {

                // Scoped variables
                var newScrollY = window.pageYOffset,
                    docHeight = document.body.scrollHeight,
                    pastDelay = newScrollY > options.delay,
                    goingDown = newScrollY > oldScrollY,
                    fastEnough = newScrollY < oldScrollY - options.sensitivity,
                    rockBottom = newScrollY < 0 || newScrollY + winHeight >= docHeight;

                // Where the magic happens
                if (pastDelay && goingDown) {
                    addClass(selector, 'sticky-header animated fadeInDown');
                } else if (!goingDown && fastEnough && !rockBottom || !pastDelay) {
                    removeClass(selector, 'sticky-header animated fadeInDown');
                }

                // Keep on keeping on
                oldScrollY = newScrollY;
            }

            // Attach listeners
            if (selector) {

                // Trigger initial resize
                resizeHandler();

                // Resize function listener
                window.addEventListener('resize', throttle(resizeHandler), false);

                // Scroll function listener
                window.addEventListener('scroll', throttle(scrollHandler, 100), false);
            }
        }
    };
    window.headsUp = headsUp;

})(window, document);
// Instantiate HeadsUp
new headsUp('.nav-area');