问题
I need to stop a div which gets a fixed position on scroll before it touches another element, basically make it go back to absolute position at a certain position, and this should be working at any size of the screen. I have a jsfiddle with code and there are two elements, please see the example and help if you know the answer thanks!
var navTop = $('#nav').offset().top;
var lastMode = "absolute";
$(window).scroll(function(){
var mode;
if ($(this).scrollTop() >= navTop) {
mode = 'fixed';
} else {
mode = 'absolute';
}
if(lastMode !== mode) {
if (mode == 'fixed') {
$('#nav').css('position', 'fixed');
$('#nav').css('top', '0');
} else {
$('#nav').css('position', 'absolute');
$('#nav').css('top', navTop);
}
lastMode = mode;
}
});
https://jsfiddle.net/Zygimantas10/vro3LLu9/
let me know if this is not clear.
回答1:
Like this ?
var navTop = $('#nav').offset().top;
var navStop = $('#stop').offset().top;
var lastMode = "absolute";
$(window).scroll(function() {
var mode;
if ($(this).scrollTop() >= navTop) {
if ($(this).scrollTop() - navStop + $('#nav').height() > 0)
mode = 'absolute';
else
mode = 'fixed';
} else {
mode = 'absolute';
}
if (lastMode !== mode) {
if (mode == 'fixed') {
$('#nav').css('position', 'fixed');
$('#nav').css('top', '0');
} else {
$('#nav').css('position', 'absolute');
$('#nav').css('top', navTop);
}
lastMode = mode;
}
});#nav {
background: rgba(0, 0, 0, 0.5);
position: absolute;
top: 200px;
width: 100px;
height: 50px;
}
#stop {
width: 100%;
background: blue;
height: 300px;
position: absolute;
top: 900px;
margin-top: 20px;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body style="height:5000px;">
<div id="nav"></div>
<div id="stop"></div>
</body>来源：https://stackoverflow.com/questions/45328251/stop-fixed-position-at-certain-div-or-certain-position