[英]Event-handler setting state from a child component doesn't re-render parent component
[英]Conditionally updating child component's state in event-handler passed by Parent-class
const Child = (props) => {
const [val, setVal] = useState(props.val);
const handleCreate = (newData) => new Promise((resolve, reject) => {
setTimeout(() => {
{
const transactions = JSON.parse(JSON.stringify(tableData));
const clean_transaction = getCleanTransaction(newData);
const db_transaction = convertToDbInterface(clean_transaction);
transactions.push(clean_transaction);
// The below code makes post-request to 2 APIs synchronously and conditionally updates the child-state if calls are successful.
**categoryPostRequest(clean_transaction)
.then(category_res => {
console.log('cat-add-res:', category_res);
transactionPostRequest(clean_transaction)
.then(transaction_res => {
addToast('Added successfully', { appearance: 'success'});
**setVal(transactions)**
}).catch(tr_err => {
addToast(tr_err.message, {appearance: 'error'});
})
}).catch(category_err => {
console.log(category_err);
addToast(category_err.message, {appearance: 'error'})
});**
}
resolve()
}, 1000)
});
return (
<MaterialTable
title={props.title}
data={val}
editable={{
onRowAdd: handleCreate
}}
/>
);
}
const Parent = (props) => {
// some other stuff to generate val
return (
<Child val={val}/>
);
}
我正在努力實現這一點:我想將句柄創建(粗體部分)中 function 的請求后部分移到可由子類調用的父組件。 這個想法是使組件抽象並可由其他類似的父類重用。
在parent中創建function,並在props中傳給child:
const Parent = (props) => {
// The handler
const onCreate = /*...*/;
// some other stuff
return (
<Child ...props onCreate={onCreate}/>
);
}
然后讓孩子使用它需要的任何參數調用 function (您的示例中似乎沒有任何參數,例如,您沒有在其中使用val
):
return (
<MaterialTable
title={props.title}
data={val}
editable={{
onRowAdd: props.onCreate // Or `onRowAdd: () => props.onCreate(parameters, go, here)`
}}
/>
);
旁注:沒有理由將props.val
復制到子組件中的val
state 成員,只需使用props.val
。
旁注 2:解構通常對 props 很方便:
const Child = ({val, onCreate}) => {
// ...
};
旁注 3:您的Parent
組件通過...props
調用Child
及其所有道具:
return (
<Child ...props onCreate={onCreate}/>
);
這通常不是最好的。 只傳遞Child
它實際需要的東西,在這種情況下, val
和onCreate
:
return (
<Child val={props.val} onCreate={onCreate}/>
);
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.