不能在呈现不同组件警告时更新组件

我得到这个警告在反应:

index.js:1 Warning: Cannot update a component (`ConnectFunction`) 
while rendering a different component (`Register`). To locate the 
bad setState() call inside `Register`

我去了堆栈跟踪中指出的位置，并删除了所有设置状态，但警告仍然存在。这可能发生在redux调度?

我的代码:

class Register extends Component {
  render() {
    if( this.props.registerStatus === SUCCESS) { 
      // Reset register status to allow return to register page
      this.props.dispatch( resetRegisterStatus())  # THIS IS THE LINE THAT CAUSES THE ERROR ACCORDING TO THE STACK TRACE
      return <Redirect push to = {HOME}/>
    }
    return (
      <div style = {{paddingTop: "180px", background: 'radial-gradient(circle, rgba(106,103,103,1) 0%, rgba(36,36,36,1) 100%)', height: "100vh"}}>
        <RegistrationForm/>
      </div>
    );
  }
}

function mapStateToProps( state ) {
  return {
    registerStatus: state.userReducer.registerStatus
  }
}

export default connect ( mapStateToProps ) ( Register );

函数，该函数触发了由register.js调用的registerForm组件中的警告

handleSubmit = async () => {
    if( this.isValidForm() ) { 
      const details = {
        "username": this.state.username,
        "password": this.state.password,
        "email": this.state.email,
        "clearance": this.state.clearance
      }
      await this.props.dispatch( register(details) )
      if( this.props.registerStatus !== SUCCESS && this.mounted ) {
        this.setState( {errorMsg: this.props.registerError})
        this.handleShowError()
      }
    }
    else {
      if( this.mounted ) {
        this.setState( {errorMsg: "Error - registration credentials are invalid!"} )
        this.handleShowError()
      }
    }
  }

堆栈跟踪：

当前回答

在GitHub中遇到类似的问题后，我能够解决这个问题，这让我看到了这条评论，展示了如何精确定位文件中导致错误的确切行。我不知道堆栈跟踪在那里。希望这能帮助到一些人!

请看下面我的解决方案。我只是将函数转换为使用回调。

旧的代码

function TopMenuItems() {
  const dispatch = useDispatch();

  function mountProjectListToReduxStore(projects) {
    const projectDropdown = projects.map((project) => ({
      id: project.id,
      name: project.name,
      organizationId: project.organizationId,
      createdOn: project.createdOn,
      lastModifiedOn: project.lastModifiedOn,
      isComplete: project.isComplete,
    }));
    projectDropdown.sort((a, b) => a.name.localeCompare(b.name));
    dispatch(loadProjectsList(projectDropdown));
    dispatch(setCurrentOrganizationId(projectDropdown[0].organizationId));
  }
};

新代码

function TopMenuItems() {
  const dispatch = useDispatch();

  const mountProjectListToReduxStore = useCallback((projects) => {
    const projectDropdown = projects.map((project) => ({
      id: project.id,
      name: project.name,
      organizationId: project.organizationId,
      createdOn: project.createdOn,
      lastModifiedOn: project.lastModifiedOn,
      isComplete: project.isComplete,
    }));
    projectDropdown.sort((a, b) => a.name.localeCompare(b.name));
    dispatch(loadProjectsList(projectDropdown));
    dispatch(setCurrentOrganizationId(projectDropdown[0].organizationId));
  }, [dispatch]);
};

2022-08-17 18:43:20

其他回答

如果你使用React导航并且你正在使用setParams或setOptions，你必须把这些放在类组件的componentDidMount()方法中或函数组件的useEffects()钩子中。

2022-01-12 03:35:11

我的例子。

带有错误的代码:

<Form
    initialValues={{ ...kgFormValues, dataflow: dataflows.length > 0 ? dataflows[0].df_tpl_key : "" }}
    onSubmit={() => {}}
    render={({values, dirtyFields }: any) => {
      
      const kgFormValuesUpdated = {
        proj_key: projectKey,
        name: values.name,
        description: values.description,
        public: values.public,
        dataflow: values.dataflow,
        flavours: flavoursSelected,
        skipOCR: values.skipOCR
      };

      if (!_.isEqual(kgFormValues, kgFormValuesUpdated)) {
        setNewKgFormValues(kgFormValuesUpdated);
      }

工作代码:

 <Form
    initialValues={{ ...kgFormValues, dataflow: dataflows.length > 0 ? dataflows[0].df_tpl_key : "" }}
    onSubmit={() => {}}
    render={({ values, dirtyFields }: any) => {
      useEffect(() => {
        const kgFormValuesUpdated = {
          proj_key: projectKey,
          name: values.name,
          description: values.description,
          public: values.public,
          dataflow: values.dataflow,
          flavours: flavoursSelected,
          skipOCR: values.skipOCR
        };

        if (!_.isEqual(kgFormValues, kgFormValuesUpdated)) {
          setNewKgFormValues(kgFormValuesUpdated);
        }
      }, [values]);

      return (

2021-10-20 10:13:14

请仔细阅读错误消息，我的是指向签入组件有一个坏的setState。当我检查时，我有一个不是箭头函数的onpress。

是这样的:

onPress={navigation.navigate("Home", { screen: "HomeScreen" })}

我把它改成了这样:

onPress={() => navigation.navigate("Home", { screen: "HomeScreen" }) }

我的错误信息是:

警告:不能更新组件 (ForwardRef(BaseNavigationContainer))，同时呈现一个不同的组件(SignIn)。来定位内部错误的setState()调用中所描述的堆栈跟踪 https://reactjs.org/link/setstate-in-render in SignIn(在SignInScreen.tsx:20)

2021-12-15 09:33:38

请看下面我的解决方案。我只是将函数转换为使用回调。

旧的代码

function TopMenuItems() {
  const dispatch = useDispatch();

  function mountProjectListToReduxStore(projects) {
    const projectDropdown = projects.map((project) => ({
      id: project.id,
      name: project.name,
      organizationId: project.organizationId,
      createdOn: project.createdOn,
      lastModifiedOn: project.lastModifiedOn,
      isComplete: project.isComplete,
    }));
    projectDropdown.sort((a, b) => a.name.localeCompare(b.name));
    dispatch(loadProjectsList(projectDropdown));
    dispatch(setCurrentOrganizationId(projectDropdown[0].organizationId));
  }
};

新代码

function TopMenuItems() {
  const dispatch = useDispatch();

  const mountProjectListToReduxStore = useCallback((projects) => {
    const projectDropdown = projects.map((project) => ({
      id: project.id,
      name: project.name,
      organizationId: project.organizationId,
      createdOn: project.createdOn,
      lastModifiedOn: project.lastModifiedOn,
      isComplete: project.isComplete,
    }));
    projectDropdown.sort((a, b) => a.name.localeCompare(b.name));
    dispatch(loadProjectsList(projectDropdown));
    dispatch(setCurrentOrganizationId(projectDropdown[0].organizationId));
  }, [dispatch]);
};

2022-08-17 18:43:20

我也有同样的问题。我设置了一些存储函数的状态，像这样:

// my state definition
const [onConfirm, setOnConfirm] = useState<() => void>();

// then I used this piece of code to update the state
function show(onConfirm: () => void) {
    setOnConfirm(onConfirm);
}

问题来自setOnConfirm。在React中，setState可以接受新值，也可以接受返回新值的函数。在这种情况下，React希望通过调用onConfirm来获得新的状态，这是不正确的。

改成这个解决了我的问题:

setOnConfirm(() => onConfirm);

2022-08-14 12:36:31

不能在呈现不同组件警告时更新组件

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