如何重新呈现一定挂钩[重复]

0

的问题

我有自定义的钩子命名为 useIsUserSubscribed 来检查一个特定的用户订阅。 这回真的如果的用户订阅和虚假的,如果用户没有订阅...

import { useState, useEffect } from "react";
import { useSelector } from "react-redux";
import { checkSubscription } from "../services";

// this hook checks if the current user is subscribed to a particular user(publisherId)
function useIsUserSubscribed(publisherId) {
  const [userIsSubscribed, setUserIsSubscribed] = useState(null);
  const currentUserId = useSelector((state) => state.auth.user?.id);

  useEffect(() => {
    if (!currentUserId || !publisherId) return;

    async function fetchCheckSubscriptionData() {
      try {
        const res = await checkSubscription(publisherId);
        setUserIsSubscribed(true);
      } catch (err) {
        setUserIsSubscribed(false);
      }
    }

    fetchCheckSubscriptionData();
  }, [publisherId, currentUserId]);

  return userIsSubscribed;
}

export default useIsUserSubscribed;

...我有一个按钮,使用这种挂钩,使案文条件的基础上布尔回来 useIsUserSubscribed...

import React, { useEffect, useState } from "react";
import { add, remove } from "../../services";
import useIsUserSubscribed from "../../hooks/useIsUserSubscribed";

const SubscribeUnsubscribeBtn = ({profilePageUserId}) => {

  const userIsSubscribed = useIsUserSubscribed(profilePageUserId);
  
  const onClick = async () => {
    if (userIsSubscribed) {
       // this is an API Call to the backend
      await removeSubscription(profilePageUserId);

    } else {
      // this is an API Call to the backend
      await addSubscription(profilePageUserId);
    }
    // HOW CAN I RERENDER THE HOOK HERE!!!!?
  }

  return (
    <button type="button" className="sub-edit-unsub-btn bsc-button" onClick={onClick}>
          {userIsSubscribed ? 'Subscribed' : 'Unsubscribed'}
    </button>
  );
} 

onClick 我想rerender我的 useIsUserSubscribed 钩,使我按钮文本的切换。 可以这样做? 我应该使用不同的办法?

javascript react-hooks reactjs
2021-11-24 03:45:44
1

最好的答案

1

SubscribeUnsubscribeBtn 有一个依赖 useIsUserSubscribeduseIsUserSubscribed 不依靠任何东西从 SubscribeUnsubscribeBtn. 相反, useIsUserSubscribed 是保持当地的状态。 你有两个选择:

  1. 移动状态的关于whetehr用户订阅了或没有上一级,由于你是终极版的使用,也许是终极版的.
  2. 沟通 useIsUserSubscribed 你需要改变其内部的状态。

对于 1)

  const [userIsSubscribed, setUserIsSubscribed] = useState(null);

移动这个国家为终极版储存和使用与useSelector.

对于 2)返回一系列的价值和回调从挂钩,而不是仅仅是值。 它会让你沟通从分回到挂钩。

useIsUserSubscribed,

  return [userIsSubscribed, setUserIsSubscribed];

然后在 onClick你可以叫 setUserIsSubscribed(false)改变钩的内部状态,并重新呈现你的分量。

2021-11-24 03:58:26

因为这是标明为重复的,你介意把你的答案在这里? stackoverflow.com/questions/70090096/... 它会帮助很多人。 我会确保给你一个投票.
Simone Anthony

看起来你已经张贴的答案在其他问题。 所以我想我就离开这里。
bitspook

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