OWASP/railsgoat

/*

scrollUp v1.0.0
Author: Mark Goodyear - http://www.markgoodyear.com
Git: https://github.com/markgoodyear/scrollup

Copyright 2013 Mark Goodyear
Licensed under the MIT license
http://www.opensource.org/licenses/mit-license.php

Twitter: @markgdyr

*/

;(function ($) {

    $.scrollUp = function (options) {

        // Settings
        var settings = {
            scrollName: 'scrollUp', // Element ID
            topDistance: '300', // Distance from top before showing element (px)
            topSpeed: 300, // Speed back to top (ms)
            animation: 'fade', // Fade, slide, none
            animationInSpeed: 200, // Animation in speed (ms)
            animationOutSpeed: 200, // Animation out speed (ms)
            scrollText: 'Scroll to top', // Text for element
            activeOverlay: false // Set CSS color to display scrollUp active point, e.g '#00FFFF'
        };

        // Load settings
        if (options) {
            var settings = $.extend(settings, options);
        }

        // Shorthand setting names
        var sn = '#' + settings.scrollName,
            an = settings.animation,
            os = settings.animationOutSpeed,
            is = settings.animationInSpeed,
            td = settings.topDistance,
            st = settings.scrollText,
            ts = settings.topSpeed,
            ao = settings.activeOverlay;

        // Create element
        $('<a/>', {
            id: settings.scrollName,
            href: '#top',
            title: st,
            text: st
        }).appendTo('body');

        // Minium CSS to make the magic happen
        $(sn).css({
            'display':'none',
            'position': 'fixed',
            'z-index': '2147483647'
        })

        // Active point overlay
        if (ao) {
            $("body").append("<div id='"+ settings.scrollName +"-active'></div>");
            $(sn+"-active").css({ 'position': 'absolute', 'top': td+'px', 'width': '100%', 'border-top': '1px dotted '+ao, 'z-index': '2147483647' })
        }

        // Scroll funtion
        $(window).scroll(function(){    

            // Fade animation
            if (an === "fade") {
                $( ($(window).scrollTop() > td) ? $(sn).fadeIn(is) : $(sn).fadeOut(os) );
            }

            // SlideUp animation
            else if (an === "slide") {
                $( ($(window).scrollTop() > td) ? $(sn).slideDown(is) : $(sn).slideUp(os) );
            }

            // No animation
            else {
                $( ($(window).scrollTop() > td) ? $(sn).show(0) : $(sn).hide(0) );
            }

        });

        // Back to the top
        $(sn).click( function(event) {
              $('html, body').animate({scrollTop:0}, ts);
            return false;
        });

    }; // End scrollUp function
}(jQuery));