Pass a Button’s Value as a Parameter Through the onClick Event Handler You might want to pass in the value or name of the button or input element through the event handler. ...return(<button value="blue"onClick
log(e.target); }; return ( <div> <button onClick={handleClick}>Click</button> </div> ); } export default App; 现在事件的类型正确了。我们不会得到"Parameter 'event' implicitly has an 'any' type"错误。 逃生舱any 如果你不想正确地为事件声明类型,你只是想摆脱错误,那么可以将事件类型设置...
AI代码解释 // App.tsxinterfaceButtonProps{handleClick:(event:React.MouseEvent<HTMLDivElement,MouseEvent>)=>void;}functionContainer({handleClick}:ButtonProps){// 👇️ wrote event handler inlinereturn<div onClick={event=>console.log(event)}>Hello world</div>;} react-get-type-of-event.gif ...
{ return {comments: []} }, getDefaultProps: function(){ return {some_object: {a:1, b:2, c:3}} }, _handleClick: function(){ alert('hello world!') }, render: function(){ return <div> There are {this.state.comments.length} comments <button onClick={this._handleClick}>click me...
(<div><p>count:{count}</p><buttononClick={()=>setCount(count=>count+1)}>Add</button></div>)}functionApp(){const[show,setShow]=useState(true)return(<div><buttononClick={()=>setShow(show=>!show)}>Toggle</button>{show&&(<KeepAlive><Counter/></KeepAlive>)}</div>)}export...
()*5,2,1]}]}});}render(){const{chartOptions,hoverData}=this.state;return(<div><HighchartsReacthighcharts={Highcharts}options={chartOptions}/><h3>Hovering over{hoverData}</h3><buttononClick={this.updateSeries.bind(this)}>Update Series</button></div>)}}render(<LineChart/>,document....
login.username} onChange={this.changeHandler.bind(this, 'loginForm', 'username')} /> <Input label='Password' type='password' value={this.state.login.password} onChange={this.changeHandler.bind(this, 'loginForm', 'password')} /> <Button onClick={this.login.bind(this)}>Login</Button> ...
ChangeEvent<HTMLInputElement>) => void; /** alternative function type syntax that takes an event (VERY COMMON) */ onClick(event: React.MouseEvent<HTMLButtonElement>): void; /** any function as long as you don't invoke it (not recommended) */ onSomething: Function; /** an optional ...
{setCalculation(()=>count*2);},[count]);// <- add the count variable herereturn(<><p>Count:{count}</p><buttononClick={()=>setCount((c)=>c+1)}>+</button><p>Calculation:{calculation}</p></>);}constroot=ReactDOM.createRoot(document.getElementById('root'));root.render(<...
state.count}</span> </span><br/> <button onClick={changeQuery}>change query</button> <button onClick={incrementCount}>increment count</button> </div>) }Vue components use the provider, so that all React components (including internal components) in the provider can get the context of ...