我有一个聊天小部件，每当我向上滚动时，它就会弹出一个消息数组。我现在面临的问题是，当消息加载时，滑块固定在顶部。我想让它关注上一个数组的最后一个索引元素。我发现我可以通过传递索引来进行动态引用，但我也需要知道使用哪种滚动函数来实现这一点
handleScrollToElement(event) {
const tesNode = ReactDOM.findDOMNode(this.refs.test)
if (some_logic){
//scroll to testNode
}
}
render() {
return (
<div>
<div ref="test"></div>
</div>)
}
当前回答
你可以这样尝试:
handleScrollToElement = e => {
const elementTop = this.gate.offsetTop;
window.scrollTo(0, elementTop);
};
render(){
return(
<h2 ref={elem => (this.gate = elem)}>Payment gate</h2>
)}
其他回答
对于读到这篇文章的人来说，如果他们没有那么幸运地使用上述解决方案，或者只是想要一个简单的即时解决方案，那么这个软件包对我来说很有用:https://www.npmjs.com/package/react-anchor-link-smooth-scroll。黑客快乐!
遵循以下步骤:
1)安装:
npm install react-scroll-to --save
2)导入包:
import { ScrollTo } from "react-scroll-to";
3)使用方法:
class doc extends Component {
render() {
return(
<ScrollTo>
{({ scroll }) => (
<a onClick={() => scroll({ x: 20, y: 500, , smooth: true })}>Scroll to Bottom</a>
)}
</ScrollTo>
)
}
}
下面是你可以用来解决这个问题的类组件代码片段:
这种方法使用了ref，并且平滑地滚动到目标ref
import React, { Component } from 'react'
export default class Untitled extends Component {
constructor(props) {
super(props)
this.howItWorks = React.createRef()
}
scrollTohowItWorks = () => window.scroll({
top: this.howItWorks.current.offsetTop,
left: 0,
behavior: 'smooth'
});
render() {
return (
<div>
<button onClick={() => this.scrollTohowItWorks()}>How it works</button>
<hr/>
<div className="content" ref={this.howItWorks}>
Lorem ipsum dolor, sit amet consectetur adipisicing elit. Nesciunt placeat magnam accusantium aliquid tenetur aspernatur nobis molestias quam. Magnam libero expedita aspernatur commodi quam provident obcaecati ratione asperiores, exercitationem voluptatum!
</div>
</div>
)
}
}
如果有人在使用Typescript，下面是Ben Carp的答案:
import { RefObject, useRef } from 'react';
export const useScroll = <T extends HTMLElement>(
options?: boolean | ScrollIntoViewOptions
): [() => void, RefObject<T>] => {
const elRef = useRef<T>(null);
const executeScroll = (): void => {
if (elRef.current) {
elRef.current.scrollIntoView(options);
}
};
return [executeScroll, elRef];
};
<div onScrollCapture={() => this._onScrollEvent()}></div>
_onScrollEvent = (e)=>{
const top = e.nativeEvent.target.scrollTop;
console.log(top);
}
