[英]Fixed Header when the Div above is scrolled past
我有此设置,以便在页面滚动400px时#headermenu变得固定。 但是,根据屏幕尺寸,该区域上方的div高度将有所变化。
当上面的div的底部(#mixedheightheader)到达窗口顶部时,我需要JS使#headermenu变得固定。
预先感谢您的帮助
<div id="mixedheightheader"></div>
$(function() { $('#headermenu'); }); $(window).scroll(function() { if ($(document).scrollTop() < 400) { if ($('#headermenu')) { $('#headermenu'); $('#headermenu').stop().css({ top: '0', position: 'relative' }); } } else { if ($('#headermenu')) { $('#headermenu'); $('#headermenu').stop().css({ top: '0', position: 'fixed' }); } } });
body { height: 3000px } #headermenu { width: 100%; background: black; min-height: 100px; } #mixedheightheader { top: 0; bottom: 0; width: 100%; height: 100vh; min-height: 200px; overflow: hidden; background: grey; clear: both; } #below { width: 100%; background: darkgrey; height: 100px; position: relative; z-index: -1; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id="mixedheightheader"></div> <div id="headermenu"></div> <div id="below"></div>
我已经更新了你的小提琴:
https://jsfiddle.net/yLon2oj3/11/
$(function() {
var isFixed = false; //This is to not fix if already fixed and reverse
$(window).scroll(function() {
var mixedHeightHeader = $('#mixedheightheader');
//This uses the offset top position and the height to calculate the bottom of your variable header
var mixedHeightHeaderBottom = mixedHeightHeader.offset().top + mixedHeightHeader.height();
var headerMenu = $('#headermenu');
if ($(document).scrollTop() < mixedHeightHeaderBottom && isFixed) {
if (headerMenu) {
headerMenu.css({
top: '0',
position: 'relative'
});
isFixed = false;
//this is to remove the placeholder space of the fixed top nav, when its not fixed to top
mixedHeightHeader.css('margin-bottom', '0');
}
}
else if ($(document).scrollTop() > mixedHeightHeaderBottom && !isFixed) {
if (headerMenu) {
headerMenu.css({
top: '0',
position: 'fixed'
});
//This holds the position that was occupied by the fixed top nav when it was a relative element, because its now taken out of the flow.
mixedHeightHeader.css('margin-bottom', headerMenu.height() + 'px');
}
isFixed = true;
}
});
});
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