我将状态钩子作为道具传递给我的组件,我的“setCity”工作得非常好,但是当我尝试实现 setFlag 时,我收到一条错误消息“Searchbar.jsx:15 Uncaught TypeError: setFlag is not a function”
那为什么我可以设置city的值而不是flag呢? 我将道具从“App”传递给“footer”,然后传递给“searchbar”。
function App(){
const [city, setCity] = useState("");
const [flag, setFlag] = useState("");
return (
<div className='container'>
<Header className='header' />
<Body className='body' city={city} flag={flag}/>
<Footer className='footer' setCity={setCity} setFlag={setFlag}/>
</div>
);
}
function Footer({setCity}, {setFlag}){
return(
<div className='footer'>
Footer
<Searchbar className='searchbar' setCity={setCity} setFlag={setFlag}/>
</div>
)
}
function Searchbar({setCity}, {setFlag}){
handleChange = (e) =>{
e.preventDefault();
console.log(e.target.value);
setCity(e.target.value);
}
handleSubmit = (e) => {
e.preventDefault();
console.log("submitted");
setFlag(false);
}
return(
<div className='searchbar'>
<form>
<select defaultValue="default" onChange={handleChange}>
<option value="default" disabled>Choose a state...</option>
<option value="Alabama">Alabama</option>
<option value="Alaska">Alaska</option>
...
</select>
<button type="button" onClick={handleSubmit}>Search</button>
</form >
</div>
);
};
答案 0 :(得分:2)
所有的 props 都作为组件的第一个参数传递,
function Searchbar({setCity}, {setFlag}){
应该
function Searchbar({setCity, setFlag}){
同样适用于Footer