Javascript 如何使用一种onLoad或componentDidMount函数?
我正在使用AntDesign,希望使用onLoad或componentDidMount函数。两者都不起作用 我如何制作具有相同用途的函数 //我尝试过但对我无效的事情。(我可能做错了事情。) 我想做的是在组件出现在屏幕上时触发一个函数。功能应该是在一系列对象中查找产品 编辑: 注释中要求的完整组件Javascript 如何使用一种onLoad或componentDidMount函数?,javascript,reactjs,antd,Javascript,Reactjs,Antd,我正在使用AntDesign,希望使用onLoad或componentDidMount函数。两者都不起作用 我如何制作具有相同用途的函数 //我尝试过但对我无效的事情。(我可能做错了事情。) 我想做的是在组件出现在屏幕上时触发一个函数。功能应该是在一系列对象中查找产品 编辑: 注释中要求的完整组件 import * as React from "react"; import {Row, Col, Image, Card, Space, Breadcrumb, Descript
import * as React from "react";
import {Row, Col, Image, Card, Space, Breadcrumb, Descriptions, InputNumber, Button} from 'antd';
import * as FreddieGras from "../images/freddieGras.jpg";
import "react-multi-carousel/lib/styles.css";
import {RouterProps} from "./router.props";
import {Link} from "@reach/router"
interface ProductDetailProps extends RouterProps {
id?: string;
}
export default function ProductDetail(props: ProductDetailProps) {
// Different kinds of grass
let grassKinds = [
{
name: 'Kate',
id: 1,
imageName: FreddieGras,
desc: "Lorem Ipsum dolor sit amet.",
available: true,
softness: 7,
realness: 6,
price: 17.95
},
{
name: 'Fred',
id: 2,
imageName: FreddieGras,
desc: "Lorem Ipsum dolor sit amet.",
available: false,
softness: 7,
realness: 6,
price: 17.95
},
{
name: 'Gideon',
id: 3,
imageName: FreddieGras,
desc: "Lorem Ipsum dolor sit amet.",
available: true,
softness: 7,
realness: 6,
price: 17.95
},
{
name: 'Isa',
id: 4,
imageName: FreddieGras,
desc: "Lorem Ipsum dolor sit amet.",
available: true,
softness: 7,
realness: 6,
price: 17.95
},
];
let product = {};
window.onload = () => {
product = grassKinds.find(x => x.id);
console.log('Toeter!');
}
return (
<div onLoad={() => {
console.log('Toeter!')
}}>
<Breadcrumb>
<Breadcrumb.Item>
<Link to="/">Home</Link>
</Breadcrumb.Item>
<Breadcrumb.Item>
</Breadcrumb.Item>
</Breadcrumb>
<Row>
<Col span={10} justify={'space-around'} align={'center'}>
<Image
src={FreddieGras}
/>
</Col>
<Col span={14}>
<Descriptions title="User Info" style={{width: '50%'}}>
<Descriptions.Item label="Naam">Kate</Descriptions.Item>
<Descriptions.Item label="Zachtheid">7/10</Descriptions.Item>
<Descriptions.Item label="Echtheid">6/10</Descriptions.Item>
<Descriptions.Item label="Prijs /m2">€17,95</Descriptions.Item>
</Descriptions>
<Card title="Bereken oppervlakte" style={{margin: '5px'}}>
<label>Lengte (m)</label>
<InputNumber
defaultValue={1000}
formatter={value => `€ ${value}`.replace(/\B(?=(\d{3})+(?!\d))/g, ',')}
onChange={() => {
console.log('Number')
}}
/>
<div>
<p><b>Omtrek </b> 10 M</p>
<p><b>Oppervlakte </b> 2,5 M2</p>
</div>
</Card>
<Card title="Totaalprijs" style={{margin: '5px'}}>
<b>€ 17,95</b>
<Button onClick={() => {
console.log('In winkelwagen')
}}>In winkelwagen</Button>
</Card>
</Col>
</Row>
</div>
)
}
import*as React from“React”;
从“antd”导入{行、列、图像、卡、空格、面包屑、描述、输入编号、按钮};
从“./images/FreddieGras.jpg”导入*作为FreddieGras;
导入“react multi carousel/lib/styles.css”;
从“/router.props”导入{RouterProps};
从“@reach/router”导入{Link}
接口ProductDetailProps扩展了RouterProps{
id?:字符串;
}
导出默认函数ProductDetail(道具:ProductDetailProps){
//不同种类的草
让我们来看一看:[
{
名字:“凯特”,
id:1,
图像名称:FreddieGras,
描述:“Lorem Ipsum dolor sit amet.”,
可用:正确,
柔软度:7,
真实性:6,
售价:17.95
},
{
姓名:“弗雷德”,
id:2,
图像名称:FreddieGras,
描述:“Lorem Ipsum dolor sit amet.”,
可用:false,
柔软度:7,
真实性:6,
售价:17.95
},
{
姓名:“吉迪恩”,
id:3,
图像名称:FreddieGras,
描述:“Lorem Ipsum dolor sit amet.”,
可用:正确,
柔软度:7,
真实性:6,
售价:17.95
},
{
名称:“Isa”,
id:4,
图像名称:FreddieGras,
描述:“Lorem Ipsum dolor sit amet.”,
可用:正确,
柔软度:7,
真实性:6,
售价:17.95
},
];
设乘积={};
window.onload=()=>{
product=grassKinds.find(x=>x.id);
console.log('Toeter!');
}
返回(
{
console.log('Toeter!')
}}>
家
凯特
7/10
6/10
€17,95
朗特(米)
`欧元${value}`。替换(/\B(?=(\d{3})+(?!\d))/g,',')}
onChange={()=>{
console.log('Number')
}}
/>
Omtrek 10米
Oppervlakte 2.5 M2
€ 17,95
{
console.log('在winkelwagen'中)
}}>在温克尔瓦根
)
}
React组件不使用窗口。onload
和componentDidMount
仅在基于类的组件中保留并有效。功能组件可以使用带有空依赖项数组的useffect
React钩子来获得与componentDidMount
生命周期方法等效的方法
let product = {};
useEffect(() => {
product = grassKinds.find(x => x.id);
console.log('Toeter!');
}, []);
展示您迄今为止所做的工作请在您的问题中包括一个代码示例,并更详细地解释什么没有按预期工作,并包括任何错误消息等。我们通常不在Reactland中使用
window.onload
。而componentDidMount
仅在基于类的组件中有效。尝试包含一个完整的组件代码示例,以便我们更好地理解您要做的事情。
componentDidMount = () => {
//Blah blah
}
import * as React from "react";
import {Row, Col, Image, Card, Space, Breadcrumb, Descriptions, InputNumber, Button} from 'antd';
import * as FreddieGras from "../images/freddieGras.jpg";
import "react-multi-carousel/lib/styles.css";
import {RouterProps} from "./router.props";
import {Link} from "@reach/router"
interface ProductDetailProps extends RouterProps {
id?: string;
}
export default function ProductDetail(props: ProductDetailProps) {
// Different kinds of grass
let grassKinds = [
{
name: 'Kate',
id: 1,
imageName: FreddieGras,
desc: "Lorem Ipsum dolor sit amet.",
available: true,
softness: 7,
realness: 6,
price: 17.95
},
{
name: 'Fred',
id: 2,
imageName: FreddieGras,
desc: "Lorem Ipsum dolor sit amet.",
available: false,
softness: 7,
realness: 6,
price: 17.95
},
{
name: 'Gideon',
id: 3,
imageName: FreddieGras,
desc: "Lorem Ipsum dolor sit amet.",
available: true,
softness: 7,
realness: 6,
price: 17.95
},
{
name: 'Isa',
id: 4,
imageName: FreddieGras,
desc: "Lorem Ipsum dolor sit amet.",
available: true,
softness: 7,
realness: 6,
price: 17.95
},
];
let product = {};
window.onload = () => {
product = grassKinds.find(x => x.id);
console.log('Toeter!');
}
return (
<div onLoad={() => {
console.log('Toeter!')
}}>
<Breadcrumb>
<Breadcrumb.Item>
<Link to="/">Home</Link>
</Breadcrumb.Item>
<Breadcrumb.Item>
</Breadcrumb.Item>
</Breadcrumb>
<Row>
<Col span={10} justify={'space-around'} align={'center'}>
<Image
src={FreddieGras}
/>
</Col>
<Col span={14}>
<Descriptions title="User Info" style={{width: '50%'}}>
<Descriptions.Item label="Naam">Kate</Descriptions.Item>
<Descriptions.Item label="Zachtheid">7/10</Descriptions.Item>
<Descriptions.Item label="Echtheid">6/10</Descriptions.Item>
<Descriptions.Item label="Prijs /m2">€17,95</Descriptions.Item>
</Descriptions>
<Card title="Bereken oppervlakte" style={{margin: '5px'}}>
<label>Lengte (m)</label>
<InputNumber
defaultValue={1000}
formatter={value => `€ ${value}`.replace(/\B(?=(\d{3})+(?!\d))/g, ',')}
onChange={() => {
console.log('Number')
}}
/>
<div>
<p><b>Omtrek </b> 10 M</p>
<p><b>Oppervlakte </b> 2,5 M2</p>
</div>
</Card>
<Card title="Totaalprijs" style={{margin: '5px'}}>
<b>€ 17,95</b>
<Button onClick={() => {
console.log('In winkelwagen')
}}>In winkelwagen</Button>
</Card>
</Col>
</Row>
</div>
)
}
let product = {};
useEffect(() => {
product = grassKinds.find(x => x.id);
console.log('Toeter!');
}, []);