Javascript 获取ReactJS中的视口/窗口高度
如何在ReactJS中获取视口高度?在普通JavaScript中,我使用Javascript 获取ReactJS中的视口/窗口高度,javascript,reactjs,window,viewport,Javascript,Reactjs,Window,Viewport,如何在ReactJS中获取视口高度?在普通JavaScript中,我使用 window.innerHeight() 但是使用ReactJS,我不知道如何获取这些信息。我的理解是 ReactDOM.findDomNode() 仅适用于已创建的零部件。但是,文档或主体元素的情况并非如此,它们可以提供窗口的高度。使用挂钩(React16.8.0+) 创建一个useWindowDimensionshook import { useState, useEffect } from 'react'; f
window.innerHeight()
但是使用ReactJS,我不知道如何获取这些信息。我的理解是
ReactDOM.findDomNode()
仅适用于已创建的零部件。但是,文档
或主体
元素的情况并非如此,它们可以提供窗口的高度。使用挂钩(React16.8.0+
)
创建一个useWindowDimensions
hook
import { useState, useEffect } from 'react';
function getWindowDimensions() {
const { innerWidth: width, innerHeight: height } = window;
return {
width,
height
};
}
export default function useWindowDimensions() {
const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());
useEffect(() => {
function handleResize() {
setWindowDimensions(getWindowDimensions());
}
window.addEventListener('resize', handleResize);
return () => window.removeEventListener('resize', handleResize);
}, []);
return windowDimensions;
}
之后,您就可以在这样的组件中使用它了
const Component = () => {
const { height, width } = useWindowDimensions();
return (
<div>
width: {width} ~ height: {height}
</div>
);
}
const组件=()=>{
const{height,width}=useWindowDimensions();
返回(
宽度:{width}~高度:{height}
);
}
原始答案
在React中也是如此,您可以使用window.innerHeight
获取当前视口的高度
如你所见
设置道具
视口高度现在在渲染模板中可用为{this.state.height}
这个答案与Jabran Saeed的类似,只是它也处理窗口大小调整。我是从你那儿得到的 您也可以尝试以下方法:
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);
}
我只是花了一些时间认真思考了一些关于React和滚动事件/位置的事情-因此对于那些仍在寻找的人,我发现了以下几点: 可以使用window.innerHeight或document.documentElement.clientHeight找到视口高度。(当前视口高度) 可以使用window.document.body.offsetHeight找到整个文档(正文)的高度 如果您试图找到文档的高度,并知道何时触底,我会想到以下几点:
if (window.pageYOffset >= this.myRefII.current.clientHeight && Math.round((document.documentElement.scrollTop + window.innerHeight)) < document.documentElement.scrollHeight - 72) {
this.setState({
trueOrNot: true
});
} else {
this.setState({
trueOrNot: false
});
}
}
唷!希望它能帮助别人 @spokedcarp的答案很好,但是如果您需要在多个组件中使用这种逻辑,那么它可能会很乏味。您可以将其重构为一个组件,以使此逻辑更易于重用 withWindowDimensions.jsx
import React, { Component } from "react";
export default function withWindowDimensions(WrappedComponent) {
return class extends Component {
state = { width: 0, height: 0 };
componentDidMount() {
this.updateWindowDimensions();
window.addEventListener("resize", this.updateWindowDimensions);
}
componentWillUnmount() {
window.removeEventListener("resize", this.updateWindowDimensions);
}
updateWindowDimensions = () => {
this.setState({ width: window.innerWidth, height: window.innerHeight });
};
render() {
return (
<WrappedComponent
{...this.props}
windowWidth={this.state.width}
windowHeight={this.state.height}
isMobileSized={this.state.width < 700}
/>
);
}
};
}
import React,{Component}来自“React”;
使用WindowDimensions导出默认函数(WrappedComponent){
返回类扩展组件{
状态={宽度:0,高度:0};
componentDidMount(){
this.updateWindowDimensions();
window.addEventListener(“resize”,this.updateWidowDimensions);
}
组件将卸载(){
removeEventListener(“resize”,this.updateWind维);
}
更新维度=()=>{
this.setState({width:window.innerWidth,height:window.innerHeight});
};
render(){
返回(
);
}
};
}
然后在您的主要组件中:
import withWindowDimensions from './withWindowDimensions.jsx';
class MyComponent extends Component {
render(){
if(this.props.isMobileSized) return <p>It's short</p>;
else return <p>It's not short</p>;
}
export default withWindowDimensions(MyComponent);
import React, { Component } from 'react'
import PropTypes from 'prop-types'
class FullArea extends Component {
constructor(props) {
super(props)
this.state = {
width: 0,
height: 0,
}
this.getStyles = this.getStyles.bind(this)
this.updateWindowDimensions = this.updateWindowDimensions.bind(this)
}
componentDidMount() {
this.updateWindowDimensions()
window.addEventListener('resize', this.updateWindowDimensions)
}
componentWillUnmount() {
window.removeEventListener('resize', this.updateWindowDimensions)
}
getStyles(vertical, horizontal) {
const styles = {}
if (vertical) {
styles.height = `${this.state.height}px`
}
if (horizontal) {
styles.width = `${this.state.width}px`
}
return styles
}
updateWindowDimensions() {
this.setState({ width: window.innerWidth, height: window.innerHeight })
}
render() {
const { vertical, horizontal } = this.props
return (
<div style={this.getStyles(vertical, horizontal)} >
{this.props.children}
</div>
)
}
}
FullArea.defaultProps = {
horizontal: false,
vertical: false,
}
FullArea.propTypes = {
horizontal: PropTypes.bool,
vertical: PropTypes.bool,
}
export default FullArea
从“./withWindowDimensions.jsx”导入withWindowDimensions;
类MyComponent扩展组件{
render(){
如果(this.props.isMobileSized)返回,则它是短的;
否则返回它不短;
}
使用WindowDimensions导出默认值(MyComponent);
如果需要使用另一个HOC,也可以“堆叠”HOC,例如使用路由器(使用WindowDimensions(MyComponent))
编辑:我会选择React hook novely(),因为@spheredcarp和@Jamesl的一些答案都非常出色。但是,在我的例子中,我需要一个组件,其高度可以扩展整个窗口高度,在渲染时是有条件的……但是在
render()中调用HOC
重新呈现整个子树。BAAAD
另外,我不想把这些值作为道具,只是想要一个父级div
,它将占据整个屏幕的高度(或宽度,或两者兼而有之)
所以我编写了一个父组件,提供了一个全高(和/或全宽)的div.Boom
用例:
class MyPage extends React.Component {
render() {
const { data, ...rest } = this.props
return data ? (
// My app uses templates which misbehave badly if you manually mess around with the container height, so leave the height alone here.
<div>Yay! render a page with some data. </div>
) : (
<FullArea vertical>
// You're now in a full height div, so containers will vertically justify properly
<GridContainer justify="center" alignItems="center" style={{ height: "inherit" }}>
<GridItem xs={12} sm={6}>
Page loading!
</GridItem>
</GridContainer>
</FullArea>
)
类MyPage扩展了React.Component{
render(){
const{data,…rest}=this.props
返回数据(
//我的应用程序使用了一些模板,如果你手工修改容器的高度,这些模板会表现得很糟糕,所以这里不要考虑容器的高度。
耶!用一些数据呈现页面。
) : (
//您现在处于全高度div中,因此容器将垂直对齐
页面加载!
)
以下是组件:
import withWindowDimensions from './withWindowDimensions.jsx';
class MyComponent extends Component {
render(){
if(this.props.isMobileSized) return <p>It's short</p>;
else return <p>It's not short</p>;
}
export default withWindowDimensions(MyComponent);
import React, { Component } from 'react'
import PropTypes from 'prop-types'
class FullArea extends Component {
constructor(props) {
super(props)
this.state = {
width: 0,
height: 0,
}
this.getStyles = this.getStyles.bind(this)
this.updateWindowDimensions = this.updateWindowDimensions.bind(this)
}
componentDidMount() {
this.updateWindowDimensions()
window.addEventListener('resize', this.updateWindowDimensions)
}
componentWillUnmount() {
window.removeEventListener('resize', this.updateWindowDimensions)
}
getStyles(vertical, horizontal) {
const styles = {}
if (vertical) {
styles.height = `${this.state.height}px`
}
if (horizontal) {
styles.width = `${this.state.width}px`
}
return styles
}
updateWindowDimensions() {
this.setState({ width: window.innerWidth, height: window.innerHeight })
}
render() {
const { vertical, horizontal } = this.props
return (
<div style={this.getStyles(vertical, horizontal)} >
{this.props.children}
</div>
)
}
}
FullArea.defaultProps = {
horizontal: false,
vertical: false,
}
FullArea.propTypes = {
horizontal: PropTypes.bool,
vertical: PropTypes.bool,
}
export default FullArea
import React,{Component}来自“React”
从“道具类型”导入道具类型
类FullArea扩展组件{
建造师(道具){
超级(道具)
此.state={
宽度:0,
高度:0,,
}
this.getStyles=this.getStyles.bind(this)
this.updateWindowDimensions=this.updateWindowDimensions.bind(this)
}
componentDidMount(){
this.updateWind维()
window.addEventListener('resize',this.updateWidowDimensions)
}
组件将卸载(){
window.removeEventListener('resize',this.updateWindImmensions)
}
getStyles(垂直、水平){
常量样式={}
如果(垂直){
style.height=`${this.state.height}px`
}
如果(水平){
style.width=`${this.state.width}px`
}
返回样式
}
updateWindowDimensions(){
this.setState({width:window.innerWidth,height:window.innerHeight})
}
render(){
const{vertical,horizontal}=this.props
返回(
{this.props.children}
)
}
}
FullArea.defaultProps={
水平:错,
垂直:假,
}
FullArea.propTypes={
水平:PropTypes.bool,
垂直:PropTypes.bool,
}
导出默认完整区域
我刚刚编辑了支持SSR的,并将其与一起使用(React 16.8.0+):
/hooks/useWindowDimensions.js:
从'react'导入{useState,useffect};
导出默认函数useWindowDimensions(){
const hasWindow=窗口类型!=“未定义”;
函数getWindowDimensions(){
const width=hasWindow?window.innerWidth:null;
const height=hasWindow?window.innerHeight:空;
返回{
宽度,
高度,
};
}
常数[风]
class MyPage extends React.Component {
render() {
const { data, ...rest } = this.props
return data ? (
// My app uses templates which misbehave badly if you manually mess around with the container height, so leave the height alone here.
<div>Yay! render a page with some data. </div>
) : (
<FullArea vertical>
// You're now in a full height div, so containers will vertically justify properly
<GridContainer justify="center" alignItems="center" style={{ height: "inherit" }}>
<GridItem xs={12} sm={6}>
Page loading!
</GridItem>
</GridContainer>
</FullArea>
)
import React, { Component } from 'react'
import PropTypes from 'prop-types'
class FullArea extends Component {
constructor(props) {
super(props)
this.state = {
width: 0,
height: 0,
}
this.getStyles = this.getStyles.bind(this)
this.updateWindowDimensions = this.updateWindowDimensions.bind(this)
}
componentDidMount() {
this.updateWindowDimensions()
window.addEventListener('resize', this.updateWindowDimensions)
}
componentWillUnmount() {
window.removeEventListener('resize', this.updateWindowDimensions)
}
getStyles(vertical, horizontal) {
const styles = {}
if (vertical) {
styles.height = `${this.state.height}px`
}
if (horizontal) {
styles.width = `${this.state.width}px`
}
return styles
}
updateWindowDimensions() {
this.setState({ width: window.innerWidth, height: window.innerHeight })
}
render() {
const { vertical, horizontal } = this.props
return (
<div style={this.getStyles(vertical, horizontal)} >
{this.props.children}
</div>
)
}
}
FullArea.defaultProps = {
horizontal: false,
vertical: false,
}
FullArea.propTypes = {
horizontal: PropTypes.bool,
vertical: PropTypes.bool,
}
export default FullArea
// 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
</>
)
}
const [windowSize, setWindowSize] = useState(null)
useEffect(() => {
const handleResize = () => {
setWindowSize(window.innerWidth)
}
window.addEventListener('resize', handleResize)
return () => window.removeEventListener('resize', handleResize)
}, [])
const [width, setWidth] = useState(window.innerWidth);
const [height, setHeight] = useState(window.innerHeight);
const updateDimensions = () => {
setWidth(window.innerWidth);
setHeight(window.innerHeight);
}
useEffect(() => {
window.addEventListener("resize", updateDimensions);
return () => window.removeEventListener("resize", updateDimensions);
}, []);
import { useState, useEffect } from "react";
export default function App() {
const [size, setSize] = useState({
x: window.innerWidth,
y: window.innerHeight
});
const updateSize = () =>
setSize({
x: window.innerWidth,
y: window.innerHeight
});
useEffect(() => (window.onresize = updateSize), []);
return (
<>
<p>width is : {size.x}</p>
<p>height is : {size.y}</p>
</>
);
}
//set up defaults on page mount
componentDidMount() {
this.state = { width: 0, height: 0 };
this.getDimensions();
//add dimensions listener for window resizing
window.addEventListener('resize', this.getDimensions);
}
//remove listener on page exit
componentWillUnmount() {
window.removeEventListener('resize', this.getDimensions);
}
//actually set the state to the window dimensions
getDimensions = () => {
this.setState({ width: window.innerWidth, height: window.innerHeight });
console.log(this.state);
}