Reactjs 单击按钮时如何更新useEffect挂钩?(如何编写按钮提交方法?)
我正在开发一个API应用程序,当用户输入工作描述或位置时,它将返回一个工作列表。最初,页面将返回所有作业,并在第一次渲染时将其显示在屏幕上(默认为useEffect)。现在我想当用户单击按钮时,页面将根据用户的输入呈现作业列表。我如何在onSubmit函数上这样做,以更新useEffect钩子的值Reactjs 单击按钮时如何更新useEffect挂钩?(如何编写按钮提交方法?),reactjs,react-hooks,use-effect,buttonclick,Reactjs,React Hooks,Use Effect,Buttonclick,我正在开发一个API应用程序,当用户输入工作描述或位置时,它将返回一个工作列表。最初,页面将返回所有作业,并在第一次渲染时将其显示在屏幕上(默认为useEffect)。现在我想当用户单击按钮时,页面将根据用户的输入呈现作业列表。我如何在onSubmit函数上这样做,以更新useEffect钩子的值 import React, { useState, useEffect} from 'react'; import SearchForm from './componenets/Form.js'; i
import React, { useState, useEffect} from 'react';
import SearchForm from './componenets/Form.js';
import JobLists from './componenets/JobLists'
import axios from 'axios'
function App() {
const [posts, setPosts] = useState([]) //posts store a list of jobs
const [description, setDescription] = useState('') //description of the job (user's input)
const [location, setLocation] = useState('') //location of the job (user's input)
//description input handle
const handleDescriptionChange = (e) => {
setDescription(e.target.value);
}
//location input handle
const handleLocationChange = (e) => {
setLocation(e.target.value);
}
//submit button handle
const onSubmit = e => {
e.preventDefault();
//once the user enter input and clicks on button, update the the useEffect hooks
}
//get data from github job API (fetching by description and location)
const url = `https://cors-anywhere.herokuapp.com/https://jobs.github.com/positions.json?description=${description}&location=${location}`
useEffect(() => {
axios.get(url)
.then(res =>{
console.log(res)
setPosts(res.data)
})
.catch(err =>{
console.log(err)
})
}, [])
return (
<div>
<SearchForm
description={description}
handleDescriptionChange={handleDescriptionChange}
location={location}
handleLocationChange={handleLocationChange}
onSubmit={onSubmit} />
{
posts.map((job) => <JobLists job={job} key={job.id} />) //map through each job
}
</div>
)
}
export default App;
import React,{useState,useffect}来自“React”;
从“/componenets/Form.js”导入SearchForm;
从“./componenets/JobLists”导入作业列表
从“axios”导入axios
函数App(){
const[posts,setPosts]=useState([])//posts存储作业列表
const[description,setDescription]=useState(“”)//作业描述(用户输入)
const[location,setLocation]=useState(“”)//作业的位置(用户输入)
//描述输入句柄
const handleDescriptionChange=(e)=>{
setDescription(如目标值);
}
//位置输入句柄
const handleLocationChange=(e)=>{
设置位置(如目标值);
}
//提交按钮手柄
const onSubmit=e=>{
e、 预防默认值();
//用户输入输入并单击按钮后,更新useEffect挂钩
}
//从github作业API获取数据(按描述和位置获取)
常量url=`https://cors-anywhere.herokuapp.com/https://jobs.github.com/positions.json?description=${description}&location=${location}`
useffect(()=>{
获取(url)
。然后(res=>{
console.log(res)
设置柱(res.data)
})
.catch(错误=>{
console.log(错误)
})
}, [])
返回(
{
posts.map((job)=>)//映射每个作业
}
)
}
导出默认应用程序;
import React,{useState,useffect}来自“React”
从“./componenets/Form.js”导入SearchForm
从“./componenets/JobLists”导入作业列表
从“axios”导入axios
常量应用=()=>{
const[posts,setPosts]=useState([])//posts存储作业列表
const[description,setDescription]=useState(“”)//作业描述(用户输入)
const[location,setLocation]=useState(“”)//作业的位置(用户输入)
常量url=`https://cors-anywhere.herokuapp.com/https://jobs.github.com/positions.json?description=${description}&location=${location}`
const getPosts=async()=>{
等待axios
.get(url)
。然后((res)=>{
console.log(res)
设置柱(res.data)
})
.catch((错误)=>{
console.log(错误)
})
}
//从github作业API获取数据(按描述和位置获取)
useffect(()=>{
getPosts()
//eslint禁用下一行react HOOK/deps
}, [])
//描述输入句柄
const handleDescriptionChange=(e)=>{
setDescription(如目标值)
}
//位置输入句柄
const handleLocationChange=(e)=>{
设置位置(如目标值)
}
//提交按钮手柄
const onSubmit=(e)=>{
e、 预防默认值()
//用户输入输入并单击按钮后,更新useEffect挂钩
getPosts()
}
返回(
{
!!立柱?长度&&
posts.map((job)=>)//映射每个作业
}
)
}
导出默认应用程序
import React, { useState, useEffect } from 'react'
import SearchForm from './componenets/Form.js'
import JobLists from './componenets/JobLists'
import axios from 'axios'
const App = () => {
const [posts, setPosts] = useState([]) //posts store a list of jobs
const [description, setDescription] = useState('') //description of the job (user's input)
const [location, setLocation] = useState('') //location of the job (user's input)
const url = `https://cors-anywhere.herokuapp.com/https://jobs.github.com/positions.json?description=${description}&location=${location}`
const getPosts = async () => {
await axios
.get(url)
.then((res) => {
console.log(res)
setPosts(res.data)
})
.catch((err) => {
console.log(err)
})
}
//get data from github job API (fetching by description and location)
useEffect(() => {
getPosts()
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [])
//description input handle
const handleDescriptionChange = (e) => {
setDescription(e.target.value)
}
//location input handle
const handleLocationChange = (e) => {
setLocation(e.target.value)
}
//submit button handle
const onSubmit = (e) => {
e.preventDefault()
//once the user enter input and clicks on button, update the the useEffect hooks
getPosts()
}
return (
<div>
<SearchForm
description={description}
handleDescriptionChange={handleDescriptionChange}
location={location}
handleLocationChange={handleLocationChange}
onSubmit={onSubmit}
/>
{
!!posts?.length &&
posts.map((job) => <JobLists key={job.id} job={job} />) //map through each job
}
</div>
)
}
export default App