背景

隔壁 zym 共事遇到了一个问题，在编辑表格时，每输出一个字符后都会失去焦点，须要从新点击聚焦后能力持续输出，如图：

​

起因

归根结底，是对于 key 的问题。
原先的代码中，components 在 render 中，然而在每次 setState 后都会触发 render，因而相当于每次 components 都是一个新变量、新组件。

import "./styles.css";
import React from "react";
import {Table, Input} from "antd";
import "antd/dist/antd.css";

export default class App extends React.Component {
  state = {
    tableInput: "",
    dataSource: [
      {
        name: "blueju",
        password: "blueju",
        type: 1
      }
    ]
  };

  handleInputChange = (e, text, index) => {const dataSource = JSON.parse(JSON.stringify(this.state.dataSource));
    dataSource[index].name = e.target.value;
    this.setState({dataSource});
  };

  render() {
    const components = {table(props) {return <table>{props.children}</table>;
      }
    };
    return (
      <div className="App">
        <h1>Hello CodeSandbox</h1>
        <h2>Start editing to see some magic happen!</h2>
        <Table dataSource={this.state.dataSource} components={components}>
          <Table.Column
            dataIndex="name"
            title="name"
            render={(text, record, index) => {if (record.type === 1) {
                return (
                  <Input
                    // key={index}
                    value={this.state.tableInput}
                    onChange={(e) => {// this.handleInputChange(e, text, index);
                      this.setState({tableInput: e.target.value});
                    }}
                  />
                );
              }
              if (record.type === 2) {return text;}
            }}
          />
        </Table>
        <Input.TextArea
          value={JSON.stringify(this.state.dataSource, null, 2)}
          autoSize
        />
      </div>
    );
  }
}

批改后：

将 components 提到组件外，当然如果不须要被其余组件共享，你也能够提到组件外部。

import "./styles.css";
import React from "react";
import {Table, Input} from "antd";
import "antd/dist/antd.css";

const components = {table(props) {return <table>{props.children}</table>;
  }
};

export default class App extends React.Component {
  state = {
    tableInput: "",
    dataSource: [
      {
        name: "blueju",
        password: "blueju",
        type: 1
      }
    ]
  };

  handleInputChange = (e, text, index) => {const dataSource = JSON.parse(JSON.stringify(this.state.dataSource));
    dataSource[index].name = e.target.value;
    this.setState({dataSource});
  };

  render() {
    return (
      <div className="App">
        <h1>Hello CodeSandbox</h1>
        <h2>Start editing to see some magic happen!</h2>
        <Table dataSource={this.state.dataSource} components={components}>
          <Table.Column
            dataIndex="name"
            title="name"
            render={(text, record, index) => {if (record.type === 1) {
                return (
                  <Input
                    // key={index}
                    value={this.state.tableInput}
                    onChange={(e) => {// this.handleInputChange(e, text, index);
                      this.setState({tableInput: e.target.value});
                    }}
                  />
                );
              }
              if (record.type === 2) {return text;}
            }}
          />
        </Table>
        <Input.TextArea
          value={JSON.stringify(this.state.dataSource, null, 2)}
          autoSize
        />
      </div>
    );
  }
}

批改后效果图：

Github

https://github.com/blueju/BlogCodeSandBox/tree/master/input-onblur-in-antd-table