返回顶部链接在消失之前闪烁两次(Back to top link flashes twice before dissappearing)
根据下面的小提琴，我有一个滚动回顶部链接，但点击链接滚动回到顶部它闪烁两次。
我已经尝试了通常的嫌疑人，如$（body，html），但即使我使用其中一个，它仍然会发生。
在fadeIn和fadeOut之前的stop（）确实有助于防止这种情况，但会导致fadeIn变得非常慢。
因此，我想知道是否有人可以解释为什么这个元素的闪现正在发生以及我如何阻止它发生？
jQuery(function() {
jQuery(window).scroll(function() {
if (jQuery(this).scrollTop() > 50) {
jQuery('#back_top').fadeIn();
} else {
jQuery('#back_top').fadeOut();
}
});
jQuery('#back_top').click(function() {
jQuery('body,html').animate({
scrollTop: 0
}, 500);
});
});
#back_top {
background-color: #447282;
/* button color */
color: white;
/* text/arrow color */
display: none;
z-index: 999;
/* float in bottom right corner */
/* 20 pixels from edge */
position: fixed;
right: 10px;
bottom: 10px;
/* size of button is 50 pixels*/
width: 54px;
height: 54px;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
opacity: 0.9;
}
a#back_top {
font-weight: 600;
letter-spacing: 2px;
font-size: 12px;
text-transform: uppercase;
text-align: center;
line-height: 1.6;
padding-left: 2px;
padding-top: 8px;
}
a#back_top .arrow:before {
content: "\e902";
font-family: 'vishIcon';
font-style: normal;
font-weight: 600;
font-size: 18px;
line-height: 1;
speak: none;
-webkit-font-smoothing: antialiased;
content: "\e902";
text-align: center;
display: block;
vertical-align: middle;
cursor: pointer;
/* margin-left: -4px; */
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
What is Lorem Ipsum? Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type
specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently
with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Why do we use it? It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using
Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default
model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like). Where does it come from? Contrary
to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the
more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum"
(The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32. The
standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact original form, accompanied by English versions
from the 1914 translation by H. Rackham. Where can I get some? There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly
believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn't anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend to repeat predefined chunks as necessary, making this
the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always free from repetition,
injected humour, or non-characteristic words etc.
<a href="#" id="back_top" style="display: none;"><span class="arrow"></span>Top</a>
As per the fiddle below I have a scroll back to top link, but upon clicking the link to scroll back to the top it flashes twice.
I have tried the usual suspects such as the $(body,html), but it still occurs even when I use one of those.
stop() before the fadeIn and fadeOut does help prevent this but causes the fadeIn to be incredibly slow.
Therefore, I was wondering if anyone could explain why this flash of the element is happening and how I could stop it from occurring?
jQuery(function() {
jQuery(window).scroll(function() {
if (jQuery(this).scrollTop() > 50) {
jQuery('#back_top').fadeIn();
} else {
jQuery('#back_top').fadeOut();
}
});
jQuery('#back_top').click(function() {
jQuery('body,html').animate({
scrollTop: 0
}, 500);
});
});
#back_top {
background-color: #447282;
/* button color */
color: white;
/* text/arrow color */
display: none;
z-index: 999;
/* float in bottom right corner */
/* 20 pixels from edge */
position: fixed;
right: 10px;
bottom: 10px;
/* size of button is 50 pixels*/
width: 54px;
height: 54px;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
opacity: 0.9;
}
a#back_top {
font-weight: 600;
letter-spacing: 2px;
font-size: 12px;
text-transform: uppercase;
text-align: center;
line-height: 1.6;
padding-left: 2px;
padding-top: 8px;
}
a#back_top .arrow:before {
content: "\e902";
font-family: 'vishIcon';
font-style: normal;
font-weight: 600;
font-size: 18px;
line-height: 1;
speak: none;
-webkit-font-smoothing: antialiased;
content: "\e902";
text-align: center;
display: block;
vertical-align: middle;
cursor: pointer;
/* margin-left: -4px; */
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
What is Lorem Ipsum? Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type
specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently
with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Why do we use it? It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using
Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default
model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like). Where does it come from? Contrary
to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the
more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum"
(The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32. The
standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact original form, accompanied by English versions
from the 1914 translation by H. Rackham. Where can I get some? There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly
believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn't anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend to repeat predefined chunks as necessary, making this
the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always free from repetition,
injected humour, or non-characteristic words etc.
<a href="#" id="back_top" style="display: none;"><span class="arrow"></span>Top</a>
最满意答案
您可以通过添加console.log来测试原因
jQuery(window).scroll(function() {
console.log(jQuery(this).scrollTop());
...
});
jQuery('#back_top').click(function() {
console.log("start");
...
});
结果显示如下
start
0
379.6666564941406
376.3166809082031
369.6166687011719
360.6833190917969
351.75
340.5833435058594
327.1833190917969
311
294.25
277.5
259.6333312988281
239
217.78334045410156
201.03334045410156
179.81666564941406
158.60000610351562
140.73333740234375
120.63333129882812
102.76667022705078
83.78333282470703
69.26667022705078
54.75
41.349998474121094
29.066667556762695
19.016666412353516
11.199999809265137
5.616666793823242
1.149999976158142
0
当你调用.animate ，第一次发生scrollTop = 0事件，然后从379.6666564941406减少到0 。 所以FadeIn发生了两次不同的时间。
所以你可以添加一个标志来计算jQuery(window).scroll on animating。
var animating = false;
jQuery(function() {
jQuery(window).scroll(function() {
if (animating) return;
if (jQuery(this).scrollTop() > 50) {
jQuery('#back_top').fadeIn();
} else {
jQuery('#back_top').fadeOut();
}
});
jQuery('#back_top').click(function() {
animating = true;
setTimeout(function(){
animating = false;
jQuery('#back_top').fadeOut();
},500)
jQuery('body,html').animate({
scrollTop: 0
}, 500);
});
});
#back_top {
background-color: #447282;
/* button color */
color: white;
/* text/arrow color */
display: none;
z-index: 999;
/* float in bottom right corner */
/* 20 pixels from edge */
position: fixed;
right: 10px;
bottom: 10px;
/* size of button is 50 pixels*/
width: 54px;
height: 54px;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
opacity: 0.9;
}
a#back_top {
font-weight: 600;
letter-spacing: 2px;
font-size: 12px;
text-transform: uppercase;
text-align: center;
line-height: 1.6;
padding-left: 2px;
padding-top: 8px;
}
a#back_top .arrow:before {
content: "\e902";
font-family: 'vishIcon';
font-style: normal;
font-weight: 600;
font-size: 18px;
line-height: 1;
speak: none;
-webkit-font-smoothing: antialiased;
content: "\e902";
text-align: center;
display: block;
vertical-align: middle;
cursor: pointer;
/* margin-left: -4px; */
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
What is Lorem Ipsum? Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type
specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently
with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Why do we use it? It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using
Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default
model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like). Where does it come from? Contrary
to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the
more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum"
(The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32. The
standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact original form, accompanied by English versions
from the 1914 translation by H. Rackham. Where can I get some? There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly
believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn't anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend to repeat predefined chunks as necessary, making this
the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always free from repetition,
injected humour, or non-characteristic words etc.
<a href="#" id="back_top" style="display: none;"><span class="arrow"></span>Top</a>
Okay looks like the animation was firing multiple times.
I have an solution with debounce and so I am not running $() inside of scroll listeners, which is a bad idea.
Debouncing will cause the action to not process until after the time threshold of inactivity has passed
jQuery(function($) {
var $backToTop = $('#back_top');
var $window = $(window);
var debounce;
$window.on('scroll', function() {
if (debounce) clearTimeout(debounce);
debounce = setTimeout(function(){
debounce = null;
$backToTop.finish();
if ($window.scrollTop() > 50) {
$backToTop.fadeIn();
} else {
$backToTop.fadeOut();
}
}, 100);
});
$backToTop.on('click', function() {
$('html').animate({
scrollTop: 0
}, 500);
});
});
#back_top {
background-color: #447282;
/* button color */
color: white;
/* text/arrow color */
display: none;
z-index: 999;
/* float in bottom right corner */
/* 20 pixels from edge */
position: fixed;
right: 10px;
bottom: 10px;
/* size of button is 50 pixels*/
width: 54px;
height: 54px;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
opacity: 0.9;
}
a#back_top {
font-weight: 600;
letter-spacing: 2px;
font-size: 12px;
text-transform: uppercase;
text-align: center;
line-height: 1.6;
padding-left: 2px;
padding-top: 8px;
}
a#back_top .arrow:before {
content: "\e902";
font-family: 'vishIcon';
font-style: normal;
font-weight: 600;
font-size: 18px;
line-height: 1;
speak: none;
-webkit-font-smoothing: antialiased;
content: "\e902";
text-align: center;
display: block;
vertical-align: middle;
cursor: pointer;
/* margin-left: -4px; */
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
What is Lorem Ipsum?
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
Why do we use it?
It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like).
Where does it come from?
Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32.
The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact original form, accompanied by English versions from the 1914 translation by H. Rackham.
Where can I get some?
There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn't anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend to repeat predefined chunks as necessary, making this the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always free from repetition, injected humour, or non-characteristic words etc.
<a href="#" id="back_top" style="display: none;"><span class="arrow"></span>Top</a>
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