javascript 如何使用 react js 添加平滑滚动返回顶部按钮？
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时间：2020-10-28 17:24:33 来源:igfitidea点击:
How to Add Smooth Scrolling Back To Top Button using react js?
提问by WitVault
I have implemented this using jquery but want to create a component in react to do the same
我已经使用 jquery 实现了这个，但是想在 react 中创建一个组件来做同样的事情
<script>
jQuery(document).ready(function() {
var offset = 220;
var duration = 500;
jQuery(window).scroll(function() {
if (jQuery(this).scrollTop() > offset) {
jQuery('.move-top').fadeIn(duration);
} else {
jQuery('.move-top').fadeOut(duration);
}
});
jQuery('.move-top').click(function(event) {
event.preventDefault();
jQuery('html, body').animate({scrollTop: 0}, duration);
return false;
})
});
</script>
In my page footer
在我的页脚
<a href="#" class="move-top">↑</a>
采纳答案by James Brierley
First, we need to track the page as it's scrolled in the state of the component. This tracking should only be happening while the component is mounted. This can be done like so:
首先，我们需要跟踪页面在组件状态下滚动时的情况。这种跟踪应该只在组件安装时发生。这可以像这样完成：
getInitialState: function() {
return { scrollTop: 0 };
},
componentWillMount: function() {
window.addEventListener('scroll', this.handleScroll);
},
componentWillUnmount: function() {
window.removeEventListener('scroll', this.handleScroll);
},
handleScroll: function() {
this.setState({scrollTop: $(window).scrollTop()});
},
Note: this is still using jQuery to get the current scroll position. See this questionfor doing this without jQuery.
注意：这仍然使用 jQuery 来获取当前滚动位置。请参阅此问题以在没有 jQuery 的情况下执行此操作。
Then we need to render the component:
然后我们需要渲染组件：
scrollToTop: function() {
$(window).animate({scrollTop: 0}, this.props.duration);
},
render: function() {
if (this.state.scrollTop < this.props.offset) {
return null;
}
return <a href="#" className="move-top" onClick={this.scrollToTop}>↑</a>
}
This is still using jQuery to do the actual scrolling. Have a look a this questionfor scrolling without jQuery.
这仍然使用 jQuery 来进行实际滚动。看看这个问题，在没有 jQuery 的情况下滚动。
If you want this component to fade in and out, you should wrap it in a ReactCSSTransitionGroupand use CSS animations. This is documented on the React docs.
如果你想让这个组件淡入淡出，你应该把它包裹在 a 中ReactCSSTransitionGroup并使用 CSS 动画。这记录在React 文档中。
Here's a JSFiddledemo.
这是一个JSFiddle演示。
回答by Hyman7
If you'd like to avoid jQuery altogether
如果你想完全避免使用 jQuery
var Example = React.createClass({
scrollUp: function () {
var doc = document.documentElement;
var top = (window.pageYOffset || doc.scrollTop) - (doc.clientTop || 0);
if (top > 0) {
window.scrollTo(0, top - 15)
setTimeout(this.scrollUp, 10)
}
},
render: function () {
return (<div><h1>Page Header</h1>
<div ref="container" className="container">
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore
et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore
et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore
et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore
et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore
et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore
et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore
et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<a className="move-top" onClick={this.scrollUp}>Up</a>
</div>
</div>);
}
});
回答by Armin
Use the following code like this :
像这样使用以下代码：
smoothScroll.scrollTo(ID_OF_DOM_ELEMENT, OPTIONAL_CALLBACK_ON_SCROLL_DONE)
Code :
代码 ：
var smoothScroll = {
timer: null,
stop: function () {
clearTimeout(this.timer);
},
scrollTo: function (id, callback) {
var settings = {
duration: 1000,
easing: {
outQuint: function (x, t, b, c, d) {
return c*((t=t/d-1)*t*t*t*t + 1) + b;
}
}
};
var percentage;
var startTime;
var node = document.getElementById(id);
var nodeTop = node.offsetTop;
var nodeHeight = node.offsetHeight;
var body = document.body;
var html = document.documentElement;
var height = Math.max(
body.scrollHeight,
body.offsetHeight,
html.clientHeight,
html.scrollHeight,
html.offsetHeight
);
var windowHeight = window.innerHeight
var offset = window.pageYOffset;
var delta = nodeTop - offset;
var bottomScrollableY = height - windowHeight;
var targetY = (bottomScrollableY < delta) ?
bottomScrollableY - (height - nodeTop - nodeHeight + offset):
delta;
startTime = Date.now();
percentage = 0;
if (this.timer) {
clearInterval(this.timer);
}
function step () {
var yScroll;
var elapsed = Date.now() - startTime;
if (elapsed > settings.duration) {
clearTimeout(this.timer);
}
percentage = elapsed / settings.duration;
if (percentage > 1) {
clearTimeout(this.timer);
if (callback) {
callback();
}
} else {
yScroll = settings.easing.outQuint(0, elapsed, offset, targetY, settings.duration);
window.scrollTo(0, yScroll);
this.timer = setTimeout(step, 10);
}
}
this.timer = setTimeout(step, 10);
}
};
回答by ted
I think react-scrollis worth being mentioned, add this to your component's clickhandler (onClick={this.handleClick})
我认为react-scroll值得一提，将此添加到您的组件的click处理程序 ( onClick={this.handleClick})
import Scroll from 'react-scroll'
...
Scroll.animateScroll.scrollToTop({options})
...
With options being an object specified as per Props/Options
选项是根据道具/选项指定的对象
回答by Nadeem Khan
I don't recommend mixing jQuery and React/Angular. It can be done easily using 'react-scroll' like this:
我不建议混合使用 jQuery 和 React/Angular。使用“ react-scroll”可以轻松完成，如下所示：
import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import { animateScroll as scroll } from 'react-scroll';
class Scrolltotop extends Component {
ScrollTo() {
scroll.scrollToTop();
}
render() {
return (
<div className="move-top-wrap">
<div onClick={this.ScrollTo} class="move-top">↑</div>
</div>
);
}
}
export default Scrolltotop;
You can check out all basic examples of react-scroll usage here.
您可以在此处查看 react-scroll 使用的所有基本示例。
You can now import and use this component anywhere.
您现在可以在任何地方导入和使用此组件。
回答by Emirhan
After searching on google, I reached a jQuery code as your needs in JSFiddle. Then, I reordered your jQuery:
在谷歌上搜索后，我在JSFiddle中找到了一个 jQuery 代码作为您的需求。然后，我重新排序了你的 jQuery：
$(document).ready(function() {
$(window).scroll(function() {
if ($(this).scrollTop() > 100) {
$('.move-top').fadeIn();
} else {
$('.move-top').fadeOut();
}
});
$('.move-top').click(function() {
$("html, body").animate({
scrollTop: 0
}, 600);
return false;
});
});.container {
min-height: 1000px;
}
.move-top {
position: fixed;
bottom: 50px;
right: 100px;
display: none;
padding: 10px 15px;
color: #fff;
font-weight: 600;
background: #333;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js"></script>
<h1>Page Header</h1>
<div class="container">
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<a class="move-top" href="#">↑</a>
</div>
<h3>Page Footer</h3>