如何在ReactJS中获得视口高度?在正常的JavaScript中使用
window.innerHeight()
但是使用ReactJS，我不确定如何获得这些信息。我的理解是
ReactDOM.findDomNode()
仅适用于已创建的组件。然而，对于文档或body元素，情况并非如此，它们可以为我提供窗口的高度。
当前回答
你也可以试试这个:
constructor(props) {
super(props);
this.state = {height: props.height, width:props.width};
}
componentWillMount(){
console.log("WINDOW : ",window);
this.setState({height: window.innerHeight + 'px',width:window.innerWidth+'px'});
}
render() {
console.log("VIEW : ",this.state);
}
其他回答
作为回答从:bren，但挂钩useEffect到[window.innerWidth]
const [dimension, updateDimention] = useState();
useEffect(() => {
window.addEventListener("resize", () => {
updateDimention({
...dimension,
width: window.innerWidth,
height: window.innerHeight
});
})
},[window.innerWidth]);
console.log(dimension);
在这里，您可以将投票次数最多的答案包装在一个节点包中(已测试，typescript)，以便使用。
安装:
npm i @teambit/toolbox.react.hooks.get-window-dimensions
用法:
import React from 'react';
import { useWindowDimensions } from '@teambit/toolbox.react.hooks.get-window-dimensions';
const MyComponent = () => {
const { height, width } = useWindowDimensions();
return (
<>
<h1>Window size</h1>
<p>Height: {height}</p>
<p>Width: {width}</p>
</>
);
};
这是你如何实现它，并在React函数组件中实时获得窗口宽度和高度:
import React, {useState, useEffect} from 'react'
const Component = () => {
const [windowWidth, setWindowWidth] = useState(0)
const [windowHeight, setWindowHeight] = useState(0)
useEffect(() => {
window.addEventListener('resize', e => {
setWindowWidth(window.innerWidth);
});
}, [window.innerWidth]);
useEffect(() => {
window.addEventListener('resize', e => {
setWindowHeight(window.innerHeight);
});
}, [window.innerHeight]);
return(
<h3>Window width is: {windowWidth} and Height: {windowHeight}</h3>
)
}
// just use (useEffect). every change will be logged with current value
import React, { useEffect } from "react";
export function () {
useEffect(() => {
window.addEventListener('resize', () => {
const myWidth = window.innerWidth;
console.log('my width :::', myWidth)
})
},[window])
return (
<>
enter code here
</>
)
}
使用钩子:
使用useLayoutEffect在这里更有效:
import { useState, useLayoutEffect } from 'react';
function getWindowDimensions() {
const { innerWidth: width, innerHeight: height } = window;
return {
width,
height
};
}
export default function useWindowDimensions() {
const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());
useLayoutEffect(() => {
function handleResize() {
setWindowDimensions(getWindowDimensions());
}
window.addEventListener('resize', handleResize);
return () => window.removeEventListener('resize', handleResize);
}, []);
return windowDimensions;
}
用法:
const { height, width } = useWindowDimensions();
