React-Apollo

Question

我有一个包含用户验证表单的组件。该组件在挂载时运行 graphql 查询。在 Verification 组件中，我需要使用 graphql 查询中的数据来设置状态，以便我可以使用它来更新任何值，然后将它们与表单一起提交。从那以后，我了解到 getDerivedStateFromProps 并且正在努力从该数据填充新状态。但是，数据在 DOM 中不可用。就好像 render 在 getDerivedStateFromProps.

之前被调用一样

组件如下：

class Verification extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            company: {
                legalName: ''
            },
            openCorporatesCompany: {}
        };
    }

    handleLegalNameChange = (legalName) => {
        let company = _.cloneDeep(this.state.company);
        company.legalName = legalName;
        this.setState({
            company
        })
    };

    static getDerivedStateFromProps(next, prev) {
        let newState = _.cloneDeep(prev);
        let {openCorporates: {getEntityAttribute}} = next;

        if (getEntityAttribute && getEntityAttribute.value) {
            let openCorporatesCompany = JSON.parse(getEntityAttribute.value);
            let company = _.cloneDeep(newState.company);
            company.legalName = openCorporatesCompany.name;
            newState.openCorporatesCompany = openCorporatesCompany;
            newState.company = company;

            return newState;
        }

        return null;
    }

    render() {
        console.log(this.state);

        return (
                    <Input
                        label='Legal Name'
                        placeholder='Legal entity name...'
                        type='text'
                        subtext='Use the name your customers or clients will recognize'
                        onChange={this.handleLegalNameChange}
                        value={this.state.legalName}
                    />
        );
    }
}

export const VerificationContainer = compose(
    connect(mapStateToProps, mapDispatchToProps)
    graphql(GetEntityAttributeQuery, {
        name: "openCorporates",
        options: (props) => ({
            variables: {
                entityId: props.currentEntity.id,
                type: EntityAttributes.TypeOpenCorporates
            }
        })
    })
)(Verification);

render 中 console.log(this.state) 的控制台输出如下所示：

如您所见，字段在 company.legalName 中的状态得到更新。但是，它永远不会填充到输入框中：

为什么输入没有更新为新状态？就好像渲染在 getDerivedStateFromProps.

之前被调用一样

Answer 1

我知道你在 React 和组件更新方面的挣扎，但我想没有绝对的方法可以摆脱它； 80% 我猜你应该尝试任何不同的生命周期方法。过去有 componentWillReceiveProps 用于异步调用，但由于它被标记为不安全（我猜）你应该尝试 getDerivedStateFromProps(props, state)

getDerivedStateFromProps(props, state) {
  console.log("*************** PROPS:",  props);

  let { openCorporates: { getEntityAttribute  } } = props;

  if (getEntityAttribute  &&  getEntityAttribute.value) {
      let openCorporatesCompany = JSON.parse(getEntityAttribute.value);
      let company = _.cloneDeep(this.state.company);

      company.legalName = openCorporatesCompany.name;
      this.setState({
          openCorporatesCompany,
          company
      })
  }
}

考虑到我没有运行代码段。

Answer 2

感谢@Charlie 的回答：

static getDerivedStateFromProps(props, state) {
    let newState = _.cloneDeep(state);
    let { openCorporates: { getEntityAttribute  } } = props;

    if (getEntityAttribute  &&  getEntityAttribute.value) {
        let openCorporatesCompany = JSON.parse(getEntityAttribute.value);
        let company = _.cloneDeep(newState.company);
        company.legalName = openCorporatesCompany.name;
        newState.openCorporatesCompany = openCorporatesCompany;
        newState.company = company;
    }

    return newState;
}

React-Apollo - 渲染在 getDerivedStateFromProps 之前被调用

React-Apollo - render getting called before getDerivedStateFromProps

reactjs

graphql