关闭时重置组件的状态
Reset states of a component when it is closed
我创建了一个 MERN 应用程序，在该应用程序中，单击按钮时会在仪表板上打开一个模式框，其中包含一些输入和一些要选择的选项，这些选项使用反应状态挂钩处理。我希望当我关闭模态框时，其中的值应该重置为默认值，当我重新打开它时，所有选项都应该重置为默认值
这是我的模态框代码
import React, { useState, useContext, useEffect } from "react";
import { UserContext } from "./UserContext";
function SplitModal({
setsplitmodal,
cost,
list,
listobj,
setlistobj,
equal,
setEqual,
payer,
setPayer,
part,
setPart,
setM,
}) {
const [method, setMethod] = useState(true);
const [split, setsplit] = useState(true);
const [owe, setowe] = useState(true);
const [owes, setowes] = useState(true);
const [click, setClick] = useState(false);
const [amount, setAmount] = useState();
const [total, setTotal] = useState(0);
const { user, userfriend } = useContext(UserContext);
console.log(user, "user hu darta koni", user.name);
console.log(listobj);
useEffect(() => {
if (equal === "unequally") {
const _listobj = { ...listobj };
Object.keys(listobj).map((f) => {
_listobj[f] = 0;
});
setlistobj(_listobj);
document.getElementById("InputId").value = "";
console.log(_listobj, "listobjsehu");
}
}, [list, cost]);
const func1 = () => {
setM(false);
setEqual("unequally");
setMethod(false);
const _list = { ...listobj };
_list[list[0]] = -cost;
_list[list[1]] = cost;
setlistobj(_list);
setowe(false);
setowes(true);
setPayer(list[1]);
setPart(`(You owe ${list[1]} ₹${cost})`);
};
const func2 = () => {
setM(false);
setEqual("unequally");
setMethod(false);
const _list = { ...listobj };
const b = _list[list[0]];
_list[list[0]] = +cost;
_list[list[1]] = -cost;
setlistobj(_list);
setPayer(list[0]);
setowe(true);
setowes(false);
setPart(`(${list[1]} owes you ₹${cost})`);
// console.log(owe, owes, click);
};
const distriequal = () => {
setM(true);
// setowe(true);
// setowes(true);
setPart(`(₹${(cost / list.length).toFixed(2)}/person)`);
setMethod(true);
setEqual("equally");
setTotal(0);
const _list = { ...listobj };
list.map((f) => {
if (f === payer) {
_list[f] = (cost - cost / list.length).toFixed(2);
} else {
_list[f] = -(cost / list.length).toFixed(2);
}
setlistobj(_list);
});
};
// console.log(listobj.exp[list[1]], listobj);
const distriamount = (e, i) => {
if (e.key === "Backspace") setM(true);
if (parseInt(e.target.value) > cost) setAmount("err");
else setAmount("");
// console.log( a.replace(a,e.targetvalue));
const _list = { ...listobj };
if (list[i] === payer) {
// _list[list[i]] = e.target.value;
// setOwner(e.target.value);
_list[payer] = parseInt(cost - e.target.value);
} else {
_list[list[i]] = -e.target.value;
}
setlistobj(_list);
if (listobj[user.name] > 0)
setPart(`You get back ₹${Math.abs(_list[user.name])}`);
else if (listobj[user.name] < 0)
setPart(`You owe ₹${Math.abs(_list[user.name])}`);
else setPart(`You owe nothing`);
};
// useEffect(() => {
// Object.keys(listobj).map((f) => {
// if (f === user.name) {
// console.log("nmnm");
// setTotal(total + owner);
// } else setTotal(total + Math.abs(listobj[f]));
// });
// }, [listobj]);
console.log(listobj, list);
return (
<div>
<div className="splitmodal">
<div
style={{
backgroundColor: "#1cc29f",
border: "1px solid #eeeeee",
padding: "5px",
display: "flex",
borderRadius: "10px 10px 0px 0px",
color: "white",
}}
>
<h5 style={{ marginLeft: "100px" }}>Choose Payer</h5>
<button
style={{ position: "absolute", right: "10px" }}
onClick={() => {
setsplitmodal(false);
}}
>
<i class="fas fa-times" />
</button>
</div>
{list.length === 2 ? (
<div className="bg-white splitmodal-main1">
<button
onClick={() => {
setMethod(true);
setM(true);
setClick();
setowe(true);
setowes(true);
}}
>
Split the expense
</button>
<button
onClick={() => {
{
setClick("owe");
return owe ? func1() : null;
}
}}
className={click === "owe" ? "click" : null}
>
You owe {list[1]} ₹{cost}
</button>
<button
className="mb-2"
onClick={() => {
{
setClick("owes");
return owes ? func2() : null;
}
}}
className={click === "owes" ? "click" : null}
>
{list[1]} owes you ₹{cost}
</button>
</div>
) : null}
{method ? (
<div className="splitmodal-main2">
<hr style={{ margin: "10px" }} />
<div className="flex justify-content-center">
<button
style={{
border: "1px solid #ccc",
borderRadius: "5px 0px 0px 5px",
}}
className={equal === "equally" ? "select" : "deselect"}
onClick={() => {
distriequal();
}}
>
Split equally
</button>
<button
style={{
border: "1px solid #ccc",
borderRadius: "0px 5px 5px 0px",
}}
className={equal === "unequally" ? "select" : "deselect"}
onClick={() => {
setEqual("unequally");
}}
>
Split by amounts
</button>
</div>
{equal === "equally" ? (
<div>
<div className="splitmodal-main3">
<h5 className="mt-2 ml-3">Split equally</h5>
<ul
style={{
display: "flex",
flexDirection: "column",
marginLeft: "10px",
}}
>
{list.map((f) => {
return (
<li className="flex align-items-center m-2">
<img
src="https://s3.amazonaws.com/splitwise/uploads/user/default_avatars/avatar-grey47-50px.png"
alt=""
/>
<span className="ml-2 font-bold">{f}</span>
<span className="absolute right-10 ">
₹{cost ? (cost / list.length).toFixed(2) : 0.0}
</span>
</li>
);
})}
</ul>
</div>
</div>
) : (
<div>
<div className="splitmodal-main3">
<h5 className="mt-2 ml-3">Split by amounts</h5>
<ul
style={{
display: "flex",
flexDirection: "column",
marginLeft: "10px",
}}
>
{list.map((f, i) => {
return (
<li key={i} className="flex align-items-center m-2">
<img
src="https://s3.amazonaws.com/splitwise/uploads/user/default_avatars/avatar-grey47-50px.png"
alt=""
/>
<span className="ml-2 font-bold">{f}</span>
<span className="absolute right-5 ">
<span
style={{
backgroundColor: "#EEEEEE",
paddingLeft: "14px",
paddingRight: "14px",
border: "1px solid #ccc",
borderRadius: "4px 0px 0px 4px",
}}
>
₹
</span>
<input
type="number"
// value={Math.abs(listobj[f])}
id="InputId"
style={{
width: "60px",
border: "1px solid #ccc",
borderRadius: "0px 4px 4px 0px",
height: "23.33px",
}}
className={
amount === "err" ? "text-red-500" : null
}
onChange={(e) => {
distriamount(e, i);
}}
/>
</span>
</li>
);
})}
</ul>
</div>
{/* <div className="mt-2 ml-3">
<h5>Total:</h5>
<span className="absolute right-10 bottom-0 ">₹{total}</span>
</div> */}
</div>
)}
</div>
) : null}
</div>
</div>
);
}
export default SplitModal;
请帮我解决这个问题
作为解决方法，您可以编写一个新的 useEffect() 来重置组件加载时的所有值，例如：
useEffect(() => {
setMethod(true);
setsplit(true);
setowe(true);
setowes(true);
setClick(false);
setAmount();
setTotal(0);
}, []);
我们实际上不需要单独的效果来执行清理。 useEffect 旨在将其保持在一起。
了解更多：https://reactjs.org/docs/hooks-effect.html#effects-with-cleanup
useEffect(() => {
// your other codes
return function reset() {
setMethod(true);
setsplit(true);
setowe(true);
setowes(true);
setClick(false);
setAmount(0);
setTotal(0);
}
}, []);
我创建了一个 MERN 应用程序，在该应用程序中，单击按钮时会在仪表板上打开一个模式框，其中包含一些输入和一些要选择的选项，这些选项使用反应状态挂钩处理。我希望当我关闭模态框时，其中的值应该重置为默认值，当我重新打开它时，所有选项都应该重置为默认值 这是我的模态框代码
import React, { useState, useContext, useEffect } from "react";
import { UserContext } from "./UserContext";
function SplitModal({
setsplitmodal,
cost,
list,
listobj,
setlistobj,
equal,
setEqual,
payer,
setPayer,
part,
setPart,
setM,
}) {
const [method, setMethod] = useState(true);
const [split, setsplit] = useState(true);
const [owe, setowe] = useState(true);
const [owes, setowes] = useState(true);
const [click, setClick] = useState(false);
const [amount, setAmount] = useState();
const [total, setTotal] = useState(0);
const { user, userfriend } = useContext(UserContext);
console.log(user, "user hu darta koni", user.name);
console.log(listobj);
useEffect(() => {
if (equal === "unequally") {
const _listobj = { ...listobj };
Object.keys(listobj).map((f) => {
_listobj[f] = 0;
});
setlistobj(_listobj);
document.getElementById("InputId").value = "";
console.log(_listobj, "listobjsehu");
}
}, [list, cost]);
const func1 = () => {
setM(false);
setEqual("unequally");
setMethod(false);
const _list = { ...listobj };
_list[list[0]] = -cost;
_list[list[1]] = cost;
setlistobj(_list);
setowe(false);
setowes(true);
setPayer(list[1]);
setPart(`(You owe ${list[1]} ₹${cost})`);
};
const func2 = () => {
setM(false);
setEqual("unequally");
setMethod(false);
const _list = { ...listobj };
const b = _list[list[0]];
_list[list[0]] = +cost;
_list[list[1]] = -cost;
setlistobj(_list);
setPayer(list[0]);
setowe(true);
setowes(false);
setPart(`(${list[1]} owes you ₹${cost})`);
// console.log(owe, owes, click);
};
const distriequal = () => {
setM(true);
// setowe(true);
// setowes(true);
setPart(`(₹${(cost / list.length).toFixed(2)}/person)`);
setMethod(true);
setEqual("equally");
setTotal(0);
const _list = { ...listobj };
list.map((f) => {
if (f === payer) {
_list[f] = (cost - cost / list.length).toFixed(2);
} else {
_list[f] = -(cost / list.length).toFixed(2);
}
setlistobj(_list);
});
};
// console.log(listobj.exp[list[1]], listobj);
const distriamount = (e, i) => {
if (e.key === "Backspace") setM(true);
if (parseInt(e.target.value) > cost) setAmount("err");
else setAmount("");
// console.log( a.replace(a,e.targetvalue));
const _list = { ...listobj };
if (list[i] === payer) {
// _list[list[i]] = e.target.value;
// setOwner(e.target.value);
_list[payer] = parseInt(cost - e.target.value);
} else {
_list[list[i]] = -e.target.value;
}
setlistobj(_list);
if (listobj[user.name] > 0)
setPart(`You get back ₹${Math.abs(_list[user.name])}`);
else if (listobj[user.name] < 0)
setPart(`You owe ₹${Math.abs(_list[user.name])}`);
else setPart(`You owe nothing`);
};
// useEffect(() => {
// Object.keys(listobj).map((f) => {
// if (f === user.name) {
// console.log("nmnm");
// setTotal(total + owner);
// } else setTotal(total + Math.abs(listobj[f]));
// });
// }, [listobj]);
console.log(listobj, list);
return (
<div>
<div className="splitmodal">
<div
style={{
backgroundColor: "#1cc29f",
border: "1px solid #eeeeee",
padding: "5px",
display: "flex",
borderRadius: "10px 10px 0px 0px",
color: "white",
}}
>
<h5 style={{ marginLeft: "100px" }}>Choose Payer</h5>
<button
style={{ position: "absolute", right: "10px" }}
onClick={() => {
setsplitmodal(false);
}}
>
<i class="fas fa-times" />
</button>
</div>
{list.length === 2 ? (
<div className="bg-white splitmodal-main1">
<button
onClick={() => {
setMethod(true);
setM(true);
setClick();
setowe(true);
setowes(true);
}}
>
Split the expense
</button>
<button
onClick={() => {
{
setClick("owe");
return owe ? func1() : null;
}
}}
className={click === "owe" ? "click" : null}
>
You owe {list[1]} ₹{cost}
</button>
<button
className="mb-2"
onClick={() => {
{
setClick("owes");
return owes ? func2() : null;
}
}}
className={click === "owes" ? "click" : null}
>
{list[1]} owes you ₹{cost}
</button>
</div>
) : null}
{method ? (
<div className="splitmodal-main2">
<hr style={{ margin: "10px" }} />
<div className="flex justify-content-center">
<button
style={{
border: "1px solid #ccc",
borderRadius: "5px 0px 0px 5px",
}}
className={equal === "equally" ? "select" : "deselect"}
onClick={() => {
distriequal();
}}
>
Split equally
</button>
<button
style={{
border: "1px solid #ccc",
borderRadius: "0px 5px 5px 0px",
}}
className={equal === "unequally" ? "select" : "deselect"}
onClick={() => {
setEqual("unequally");
}}
>
Split by amounts
</button>
</div>
{equal === "equally" ? (
<div>
<div className="splitmodal-main3">
<h5 className="mt-2 ml-3">Split equally</h5>
<ul
style={{
display: "flex",
flexDirection: "column",
marginLeft: "10px",
}}
>
{list.map((f) => {
return (
<li className="flex align-items-center m-2">
<img
src="https://s3.amazonaws.com/splitwise/uploads/user/default_avatars/avatar-grey47-50px.png"
alt=""
/>
<span className="ml-2 font-bold">{f}</span>
<span className="absolute right-10 ">
₹{cost ? (cost / list.length).toFixed(2) : 0.0}
</span>
</li>
);
})}
</ul>
</div>
</div>
) : (
<div>
<div className="splitmodal-main3">
<h5 className="mt-2 ml-3">Split by amounts</h5>
<ul
style={{
display: "flex",
flexDirection: "column",
marginLeft: "10px",
}}
>
{list.map((f, i) => {
return (
<li key={i} className="flex align-items-center m-2">
<img
src="https://s3.amazonaws.com/splitwise/uploads/user/default_avatars/avatar-grey47-50px.png"
alt=""
/>
<span className="ml-2 font-bold">{f}</span>
<span className="absolute right-5 ">
<span
style={{
backgroundColor: "#EEEEEE",
paddingLeft: "14px",
paddingRight: "14px",
border: "1px solid #ccc",
borderRadius: "4px 0px 0px 4px",
}}
>
₹
</span>
<input
type="number"
// value={Math.abs(listobj[f])}
id="InputId"
style={{
width: "60px",
border: "1px solid #ccc",
borderRadius: "0px 4px 4px 0px",
height: "23.33px",
}}
className={
amount === "err" ? "text-red-500" : null
}
onChange={(e) => {
distriamount(e, i);
}}
/>
</span>
</li>
);
})}
</ul>
</div>
{/* <div className="mt-2 ml-3">
<h5>Total:</h5>
<span className="absolute right-10 bottom-0 ">₹{total}</span>
</div> */}
</div>
)}
</div>
) : null}
</div>
</div>
);
}
export default SplitModal;
请帮我解决这个问题
作为解决方法，您可以编写一个新的 useEffect() 来重置组件加载时的所有值，例如：
useEffect(() => {
setMethod(true);
setsplit(true);
setowe(true);
setowes(true);
setClick(false);
setAmount();
setTotal(0);
}, []);
我们实际上不需要单独的效果来执行清理。 useEffect 旨在将其保持在一起。
了解更多：https://reactjs.org/docs/hooks-effect.html#effects-with-cleanup
useEffect(() => {
// your other codes
return function reset() {
setMethod(true);
setsplit(true);
setowe(true);
setowes(true);
setClick(false);
setAmount(0);
setTotal(0);
}
}, []);