Created
August 29, 2012 22:21
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Dynamically sized Nav menus with fixed scrolling
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| # Menubar Scrolling | |
| header_h = -> $('#header').outerHeight() | |
| content_h = -> $('#content .container .row').outerHeight() - 22 | |
| footer_h = -> $('#footer').outerHeight() | |
| left_column_h = -> $('.content_left_column').outerHeight() | |
| right_column_h = -> $('.content_right_column').outerHeight() | |
| nav_and_flash_h = -> $('#content-header').outerHeight() + $('.flash_container').outerHeight() | |
| sticky_nav_h = -> $('#sticky-nav').outerHeight() | |
| sticky_nav_top_margin = 0 | |
| current_bottom_of_sticky_nav = -> | |
| $(window).scrollTop() + sticky_nav_h() | |
| sticky_nav_top_max = -> header_h() + nav_and_flash_h() | |
| sticky_nav_bottom_max = -> header_h() + content_h() | |
| sticky_nav_top_margin_max = -> $(window).height() - sticky_nav_h() - 22 | |
| sticky_nav_is_at_top = -> return $(window).scrollTop() > sticky_nav_top_max() | |
| sticky_nav_is_at_bottom = -> | |
| if sticky_nav_is_larger_than_window() | |
| return current_bottom_of_sticky_nav() + sticky_nav_top_margin > sticky_nav_bottom_max() | |
| else | |
| return current_bottom_of_sticky_nav() > sticky_nav_bottom_max() | |
| sticky_nav_can_float = -> right_column_h() < left_column_h() | |
| sticky_nav_is_larger_than_window = -> sticky_nav_h() > $(window).height() | |
| previous_scroll_top = $(window).scrollTop() | |
| scrolling_up = -> return previous_scroll_top > $(window).scrollTop() | |
| $(window).scroll -> | |
| if sticky_nav_can_float() && sticky_nav_is_at_top() | |
| $('#sticky-nav').addClass('fixed').css('top', '0').css('margin-top', calculate_sticky_nav_top_margin() + 'px') | |
| else | |
| $('#sticky-nav').removeClass('fixed').css('margin-top', '0') | |
| sticky_nav_top_margin = 0 | |
| previous_scroll_top = $(window).scrollTop() | |
| calculate_sticky_nav_top_margin = -> | |
| if sticky_nav_is_at_bottom() | |
| # If the nav is larger than than window | |
| if sticky_nav_is_larger_than_window() && scrolling_up() && sticky_nav_top_margin < 0 | |
| # Substitute the scroll distance from the top margin | |
| return sticky_nav_top_margin = Math.min(0, sticky_nav_top_margin + (previous_scroll_top - $(window).scrollTop())) | |
| else | |
| return sticky_nav_top_margin = (header_h() + content_h()) - current_bottom_of_sticky_nav() | |
| else if sticky_nav_is_larger_than_window() | |
| if scrolling_up() && sticky_nav_top_margin < 0 | |
| return sticky_nav_top_margin = Math.min(0, sticky_nav_top_margin + (previous_scroll_top - $(window).scrollTop())) | |
| if !scrolling_up() && sticky_nav_top_margin > sticky_nav_top_margin_max() | |
| return sticky_nav_top_margin = Math.max(sticky_nav_top_margin_max(), sticky_nav_top_margin - ($(window).scrollTop() - previous_scroll_top)) | |
| else | |
| return 0 |
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