取消使用中的Axios请求效果未运行

时间:2020-05-21 17:15:35

标签: reactjs axios react-hooks

我正在尝试取消axios请求,但是我只获得了部分成功。我有此函数,当我发出GET请求时会返回一个Promise:

const getCards = (token) => {
  const URL = isDev
    ? "https://cors-anywhere.herokuapp.com/https://privacy.com/api/v1/card"
    : "https://privacy.com/api/v1/card";
  const config = {
    headers: {
      Authorization: `Bearer ${token}`,
    },
    cancelToken: source.token,
  };

  return axios.get(URL, config);
};

我在updateCards()内部调用此函数,如下所示:

const updateCards = async () => {
  console.log("Updating Cards");

  setCards([]);
  setStarted(true);
  setLoading(true);

  let response = await getCards(token).catch((thrown) => {
    if (axios.isCancel(thrown)) {
      console.error("[UpdateCards]", thrown.message);
    }
  });

  /**
   * response is undefined when we cancel the request on unmount
   */

  if (typeof response === "undefined") return console.log("Undefined");

  console.log("Got Response from UpdateCards", response);

  setLoading(false);
};

我这样取消了useEffect挂钩中的请求:

useEffect(() => {
    return () => {
        source.cancel()
    }
}, [])

我已经按照下面的状态声明设置了CancelToken:

const CancelToken = axios.CancelToken;
const source = CancelToken.source();

我的问题是,如果我在useEffect()内部调用updateCards()函数,则可以取消它,但是如果我使用按钮调用该函数,则取消将不会运行。我到处都看过了,发现的唯一解决方案是我必须在useEffect()挂钩中调用我的请求,但这不是我想要做的事情。我从这里去哪里?

以下是我看过的资源:

https://github.com/axios/axios#cancellation

https://medium.com/@selvaganesh93/how-to-clean-up-subscriptions-in-react-components-using-abortcontroller-72335f19b6f7

Cant cancel Axios post request via CancelToken

1 个答案:

答案 0 :(得分:2)

要在某个位置存储行为类似于组件instance variable的变量,可以使用useRef。它是您想要的任何内容的容器。您可以在其中存储CancelToken:

function Privacy(props) {
  const source = useRef(null);

  function getSource() {
    if (source.current == null) {
      const CancelToken = axios.CancelToken;
      source.current = CancelToken.source();
    }
    return source.current;
  }

  useEffect(() => {
    return () => {
      if (source.current != null) source.current.cancel();
    }
  }, [])

  // call `getSource()` wherever you need the Axios source
}