[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}/>
);
}
I am struggling to achieve this: I'd like to move the post-request part of the function in handleCreate (bold-section), over to the Parent-component that can be called by the Child-class.我正在努力实现这一点:我想将句柄创建(粗体部分)中 function 的请求后部分移到可由子类调用的父组件。 The idea is to make the Component abstract and re-usable by other similar Parent-classes.这个想法是使组件抽象并可由其他类似的父类重用。
Create the function in the parent, and pass it to the child in the props:在parent中创建function,并在props中传给child:
const Parent = (props) => {
// The handler
const onCreate = /*...*/;
// some other stuff
return (
<Child ...props onCreate={onCreate}/>
);
}
Then have the child call the function with any parameters it needs (there don't seem to be any in your example, you're not using val
in it for instance):然后让孩子使用它需要的任何参数调用 function (您的示例中似乎没有任何参数,例如,您没有在其中使用val
):
return (
<MaterialTable
title={props.title}
data={val}
editable={{
onRowAdd: props.onCreate // Or `onRowAdd: () => props.onCreate(parameters, go, here)`
}}
/>
);
Side note: There's no reason to copy props.val
to val
state member within the child component, just use props.val
.旁注:没有理由将props.val
复制到子组件中的val
state 成员,只需使用props.val
。
Side note 2: Destructuring is often handy with props:旁注 2:解构通常对 props 很方便:
const Child = ({val, onCreate}) => {
// ...
};
Side note 3: You have your Parent
component calling Child
with all of its props, via ...props
:旁注 3:您的Parent
组件通过...props
调用Child
及其所有道具:
return (
<Child ...props onCreate={onCreate}/>
);
That's generally not best.这通常不是最好的。 Only pass Child
what it actually needs, in this case, val
and onCreate
:只传递Child
它实际需要的东西,在这种情况下, val
和onCreate
:
return (
<Child val={props.val} onCreate={onCreate}/>
);
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