返回顶部按钮没有隐藏
back to top button doesn't hide
我是jquery新手。我正在为我的网站做一个回到顶部的箭头,我有一个关于隐藏回到顶部按钮的问题。它总是露出来,从不隐藏。所有我想要的是隐藏按钮,也许90px高度后,它会再次显示。请帮我一下。
这是我的jquery脚本从我的头部顶部:
<script>
$(document).ready(function(){
// hide #back-top first
$("#back-top").hide();
// fade in #back-top
$(function () {
$(window).scroll(function () {
if ($(this).scrollTop() > 90) {
$('#back-top').fadeIn();
} else {
$('#back-top').fadeOut();
}
});
// scroll body to 0px on click
$('#back-top a').click(function () {
$('body,html').animate({
scrollTop: 0}, 800);
return false;
});
});
});
</script>
这是我的back to top HTML:
<a id="back-top" href="#top">
<i id="back-topi" class="fa fa-arrow-circle-up"></i>
</a>
我的CSS:
#back-top {
display: block !important;
background: none;
margin: 0;
position: fixed;
bottom: 50px;
right: 45%;
width: 40px;
height: 40px;
z-index: 100;
text-decoration: none;
color: #ffffff;
background-color: rgba(163,15,15,0.4);
border-radius: 8px !important;
}
#back-topi {
display: block !important;
font-size: 40px;
}
你必须改变你的CSS以及jQuery作为:
代码片段
$(document).ready(function(e) {
// browser window scroll (in pixels) after which the "back to top" link is shown
var offset = 300,
//browser window scroll (in pixels) after which the "back to top" link opacity is reduced
offset_opacity = 1200,
//duration of the top scrolling animation (in ms)
scroll_top_duration = 700,
//grab the "back to top" link
$back_to_top = $('#back-top');
//hide or show the "back to top" link
$(window).scroll(function() {
($(this).scrollTop() > offset) ? $back_to_top.addClass('is-visible'):
$back_to_top.removeClass('is-visible is-fade-out');
if ($(this).scrollTop() > offset_opacity) {
$back_to_top.addClass('is-fade-out');
}
});
//smooth scroll to top
$back_to_top.on('click', function(event) {
event.preventDefault();
$('body,html').animate({
scrollTop: 0,
}, scroll_top_duration);
});
});
body {
height: 1000px;
margin: 0;
padding: 0;
}
#back-top {
display: inline-block;
background: none;
margin: 0;
position: fixed;
bottom: 50px;
right: 45%;
width: 40px;
height: 40px;
z-index: 100;
text-decoration: none;
color: #ffffff;
background-color: rgba(163, 15, 15, 0.4);
border-radius: 8px;
visibility: hidden;
opacity: 0;
-webkit-transition: opacity .3s 0s, visibility 0s .3s;
-moz-transition: opacity .3s 0s, visibility 0s .3s;
transition: opacity .3s 0s, visibility 0s .3s;
}
#back-topi {
font-size: 40px;
}
#back-top.is-visible,
#back-top.is-fade-out,
#back-top:hover {
-webkit-transition: opacity .3s 0s, visibility 0s 0s;
-moz-transition: opacity .3s 0s, visibility 0s 0s;
transition: opacity .3s 0s, visibility 0s 0s;
}
#back-top.is-visible {
/* the button becomes visible */
visibility: visible;
opacity: 1;
}
#back-top:hover {
background-color: #0180ca;
opacity: 1;
}
#back-top:hover,
#back-top:active,
#back-top:focus {
outline: none;
text-decoration: none;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a id="back-top" href="#top">
<i id="back-topi" class="fa fa-arrow-circle-up"></i>
</a>
当你滚动(top> 90)时,你需要用命令
显示它$("#back-top").show();
编辑问题是:重要标签覆盖display:none标签。删除它(在css上)
display:none;
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