Javascript 在ReactJs中用按钮值填充输入
我正在用ReactJS构建一个小应用程序,它由一个以字母为值的按钮网格组成,我需要做的是用点击按钮的字母填充一个输入字段,基本上就像一个键盘 我用按钮构建了网格,每个按钮都有一个字母,但我不确定下一部分应该如何编码;每个按钮应该有两个声明,单击或不单击,如果单击,字母将显示在输入上,如果再次单击,则应将其删除 这些是我现在的组件: 方形Javascript 在ReactJs中用按钮值填充输入,javascript,reactjs,Javascript,Reactjs,我正在用ReactJS构建一个小应用程序,它由一个以字母为值的按钮网格组成,我需要做的是用点击按钮的字母填充一个输入字段,基本上就像一个键盘 我用按钮构建了网格,每个按钮都有一个字母,但我不确定下一部分应该如何编码;每个按钮应该有两个声明,单击或不单击,如果单击,字母将显示在输入上,如果再次单击,则应将其删除 这些是我现在的组件: 方形 import React from "react" class Square extends React.Component { render()
import React from "react"
class Square extends React.Component {
render() {
return (
<button type="button" className="square">{this.props.letter}</button>
);
}
}
export default Square;
从“React”导入React
类Square扩展了React.Component{
render(){
返回(
{this.props.letter}
);
}
}
导出默认方块;
输入组件
import React from 'react';
class Clear extends React.Component {
render() {
return (
<div className="clear-btn">
<button><span>Clear Word</span><span className="cross-icon">X</span></button>
<input className="cust-input" type="text"/>
</div>
);
}
}
export default Clear;
function App() {
return (
<div className="App">
<div className="container">
<div className="letters">
{LettersJSON.board.map( (letter, index) => <Square key={index} letter={letter}/>)}
</div>
<div className="controls">
<Clear />
</div>
</div>
</div>
);
}
export default App;
从“React”导入React;
类Clear扩展了React.Component{
render(){
返回(
清除WordX
);
}
}
导出默认清除;
主要应用程序组件
import React from 'react';
class Clear extends React.Component {
render() {
return (
<div className="clear-btn">
<button><span>Clear Word</span><span className="cross-icon">X</span></button>
<input className="cust-input" type="text"/>
</div>
);
}
}
export default Clear;
function App() {
return (
<div className="App">
<div className="container">
<div className="letters">
{LettersJSON.board.map( (letter, index) => <Square key={index} letter={letter}/>)}
</div>
<div className="controls">
<Clear />
</div>
</div>
</div>
);
}
export default App;
函数应用程序(){
返回(
{LettersJSON.board.map((字母,索引)=>)}
);
}
导出默认应用程序;
如果有人能在这方面帮助我,那就太好了,我不知道什么是获得按钮值并在单击时将其添加到输入中的好方法
我想这必须通过事件或类似的事情来完成,老实说,我刚刚开始学习React,我不确定如何安排所有组件,以便它们一起工作
以下是该应用程序目前的外观:
考虑以下代码,这里也是为您准备的沙箱: 这是我们的应用程序组件。我们将在这里填充按钮,并给每个按钮一个字母,通过道具传递。我们还为每个按钮组件提供一个状态更新程序函数,该函数将更新应用程序组件的状态
import React from 'react'
import ReactDOM from 'react-dom'
import Button from './Button'
import Input from './Input'
class App extends React.Component {
state = {
letters: ['a', 'b', 'c', 'd', 'e'],
value: '',
}
updateValue = letter => {
console.log('ran')
this.setState({
value: this.state.value + letter,
})
}
createButtons = () => {
const letters = this.state.letters
return letters.map(letter => (
<Button letter={letter} updateValue={this.updateValue} />
))
}
render() {
return (
<div>
{this.createButtons()}
<Input value={this.state.value} />
</div>
)
}
}
ReactDOM.render(<App />, document.getElementById('root'))
import React from 'react'
class Input extends React.Component {
render() {
return <input value={this.props.value} />
}
}
export default Input
class App extends Component {
constructor(props) {
super(props);
this.state = {
clickedLetters: [],
};
}
saveClickedLetter(letter) {
const { clickedLetters } = this.state;
const cloneOfClickedLetters = clickedLetters;
cloneOfClickedLetters.push(letter);
this.setState({ clickedLetters: cloneOfClickedLetters });
}
render() {
const { clickedLetters } = this.state;
return (
<div className="App">
<div className="container">
<div className="letters">
{LettersJSON.board.map( (letter, index) => <Square key={index} letter={letter} handleClick={this.saveClickedLetter}/>)}
</div>
<div className="controls">
<Clear clickedLetters={clickedLetters.length > 0 && clickedLetters.join()}/>
</div>
</div>
</div>
)
}
}
export default App;
从“React”导入React
从“react dom”导入react dom
从“./按钮”导入按钮
从“./Input”导入输入
类应用程序扩展了React.Component{
状态={
字母:[a',b',c',d',e'],
值:“”,
}
updateValue=字母=>{
console.log('ran')
这是我的国家({
value:this.state.value+字母,
})
}
createButtons=()=>{
常量字母=this.state.letters
返回信件.map(信件=>(
))
}
render(){
返回(
{this.createButtons()}
)
}
}
ReactDOM.render(,document.getElementById('root'))
按钮组件:在这里,我们在单击时不断调用状态更新函数,并跟踪以前是否单击过它
import React from 'react'
class Button extends React.Component {
state = {
clicked: false,
}
handleOnClick = () => {
if (!this.state.clicked) {
this.props.updateValue(this.props.letter)
this.setState({
clicked: true,
})
}
}
render() {
return (
<button onClick={this.handleOnClick} disabled={this.state.clicked}>
{this.props.letter}
</button>
)
}
}
export default Button
从“React”导入React
类按钮扩展了React.Component{
状态={
点击:错,
}
handleOnClick=()=>{
如果(!this.state.clicked){
this.props.updateValue(this.props.letter)
这是我的国家({
对,,
})
}
}
render(){
返回(
{this.props.letter}
)
}
}
导出默认按钮
最后,我们有输入组件:它只消耗父应用程序组件的值
import React from 'react'
import ReactDOM from 'react-dom'
import Button from './Button'
import Input from './Input'
class App extends React.Component {
state = {
letters: ['a', 'b', 'c', 'd', 'e'],
value: '',
}
updateValue = letter => {
console.log('ran')
this.setState({
value: this.state.value + letter,
})
}
createButtons = () => {
const letters = this.state.letters
return letters.map(letter => (
<Button letter={letter} updateValue={this.updateValue} />
))
}
render() {
return (
<div>
{this.createButtons()}
<Input value={this.state.value} />
</div>
)
}
}
ReactDOM.render(<App />, document.getElementById('root'))
import React from 'react'
class Input extends React.Component {
render() {
return <input value={this.props.value} />
}
}
export default Input
class App extends Component {
constructor(props) {
super(props);
this.state = {
clickedLetters: [],
};
}
saveClickedLetter(letter) {
const { clickedLetters } = this.state;
const cloneOfClickedLetters = clickedLetters;
cloneOfClickedLetters.push(letter);
this.setState({ clickedLetters: cloneOfClickedLetters });
}
render() {
const { clickedLetters } = this.state;
return (
<div className="App">
<div className="container">
<div className="letters">
{LettersJSON.board.map( (letter, index) => <Square key={index} letter={letter} handleClick={this.saveClickedLetter}/>)}
</div>
<div className="controls">
<Clear clickedLetters={clickedLetters.length > 0 && clickedLetters.join()}/>
</div>
</div>
</div>
)
}
}
export default App;
从“React”导入React
类输入扩展了React.Component{
render(){
返回
}
}
导出默认输入
如果这对你有帮助,请告诉我。我觉得这基本上提供了让代码正常工作所需的原则。考虑一下以下代码,这里也是为您准备的沙箱: 这是我们的应用程序组件。我们将在这里填充按钮,并给每个按钮一个字母,通过道具传递。我们还为每个按钮组件提供一个状态更新程序函数,该函数将更新应用程序组件的状态
import React from 'react'
import ReactDOM from 'react-dom'
import Button from './Button'
import Input from './Input'
class App extends React.Component {
state = {
letters: ['a', 'b', 'c', 'd', 'e'],
value: '',
}
updateValue = letter => {
console.log('ran')
this.setState({
value: this.state.value + letter,
})
}
createButtons = () => {
const letters = this.state.letters
return letters.map(letter => (
<Button letter={letter} updateValue={this.updateValue} />
))
}
render() {
return (
<div>
{this.createButtons()}
<Input value={this.state.value} />
</div>
)
}
}
ReactDOM.render(<App />, document.getElementById('root'))
import React from 'react'
class Input extends React.Component {
render() {
return <input value={this.props.value} />
}
}
export default Input
class App extends Component {
constructor(props) {
super(props);
this.state = {
clickedLetters: [],
};
}
saveClickedLetter(letter) {
const { clickedLetters } = this.state;
const cloneOfClickedLetters = clickedLetters;
cloneOfClickedLetters.push(letter);
this.setState({ clickedLetters: cloneOfClickedLetters });
}
render() {
const { clickedLetters } = this.state;
return (
<div className="App">
<div className="container">
<div className="letters">
{LettersJSON.board.map( (letter, index) => <Square key={index} letter={letter} handleClick={this.saveClickedLetter}/>)}
</div>
<div className="controls">
<Clear clickedLetters={clickedLetters.length > 0 && clickedLetters.join()}/>
</div>
</div>
</div>
)
}
}
export default App;
从“React”导入React
从“react dom”导入react dom
从“./按钮”导入按钮
从“./Input”导入输入
类应用程序扩展了React.Component{
状态={
字母:[a',b',c',d',e'],
值:“”,
}
updateValue=字母=>{
console.log('ran')
这是我的国家({
value:this.state.value+字母,
})
}
createButtons=()=>{
常量字母=this.state.letters
返回信件.map(信件=>(
))
}
render(){
返回(
{this.createButtons()}
)
}
}
ReactDOM.render(,document.getElementById('root'))
按钮组件:在这里,我们在单击时不断调用状态更新函数,并跟踪以前是否单击过它
import React from 'react'
class Button extends React.Component {
state = {
clicked: false,
}
handleOnClick = () => {
if (!this.state.clicked) {
this.props.updateValue(this.props.letter)
this.setState({
clicked: true,
})
}
}
render() {
return (
<button onClick={this.handleOnClick} disabled={this.state.clicked}>
{this.props.letter}
</button>
)
}
}
export default Button
从“React”导入React
类按钮扩展了React.Component{
状态={
点击:错,
}
handleOnClick=()=>{
如果(!this.state.clicked){
this.props.updateValue(this.props.letter)
这是我的国家({
对,,
})
}
}
render(){
返回(
{this.props.letter}
)
}
}
导出默认按钮
最后,我们有输入组件:它只消耗父应用程序组件的值
import React from 'react'
import ReactDOM from 'react-dom'
import Button from './Button'
import Input from './Input'
class App extends React.Component {
state = {
letters: ['a', 'b', 'c', 'd', 'e'],
value: '',
}
updateValue = letter => {
console.log('ran')
this.setState({
value: this.state.value + letter,
})
}
createButtons = () => {
const letters = this.state.letters
return letters.map(letter => (
<Button letter={letter} updateValue={this.updateValue} />
))
}
render() {
return (
<div>
{this.createButtons()}
<Input value={this.state.value} />
</div>
)
}
}
ReactDOM.render(<App />, document.getElementById('root'))
import React from 'react'
class Input extends React.Component {
render() {
return <input value={this.props.value} />
}
}
export default Input
class App extends Component {
constructor(props) {
super(props);
this.state = {
clickedLetters: [],
};
}
saveClickedLetter(letter) {
const { clickedLetters } = this.state;
const cloneOfClickedLetters = clickedLetters;
cloneOfClickedLetters.push(letter);
this.setState({ clickedLetters: cloneOfClickedLetters });
}
render() {
const { clickedLetters } = this.state;
return (
<div className="App">
<div className="container">
<div className="letters">
{LettersJSON.board.map( (letter, index) => <Square key={index} letter={letter} handleClick={this.saveClickedLetter}/>)}
</div>
<div className="controls">
<Clear clickedLetters={clickedLetters.length > 0 && clickedLetters.join()}/>
</div>
</div>
</div>
)
}
}
export default App;
从“React”导入React
类输入扩展了React.Component{
render(){
返回
}
}
导出默认输入
如果这对你有帮助,请告诉我。我觉得这基本上提供了使代码正常工作所需的原则。让我们将所需内容分解为以下步骤:
import React from "react"
class Square extends React.Component {
render() {
const { handleClick, letter } = this.props;
return (
<button type="button" className="square" onClick={() => handleClick(letter)}>
{this.props.letter}
</button>
);
}
}
export default Square;
从“React”导入React
类Square扩展了React.Component{
render(){
const{handleClick,letter}=this.props;
返回(
handleClick(字母)}>
{this.props.let