Question

名字：

handleFirstName(e) {
      let value = e.target.value;
      this.setState(prevState => ({
        newUser: {
          ...prevState.newUser,
          name: value
        }
      }));
    }

姓氏：

handleLastName(e) {
    let value = e.target.value;
    this.setState(prevState => ({
      newUser: {
        ...prevState.newUser,
        name: value
      }
    }));
  }

如何在React js中连接名字和姓氏？有人可以帮我实现fullName的方法吗？

Answer 1

有几种获取fullName的方法，除了可以在方法中添加名称，还可以添加firstName和lastName，然后编写方法getFullName()来访问它，并确保已定义newUser处于状态

import React, { Component } from "react";

class User extends Component {
  state = {
    newUser: { firstName: "", lastName: "" }
  };
  handleFirstName(e) {
    let value = e.target.value;
    this.setState(prevState => ({
      newUser: {
        ...prevState.newUser,
        firstName: value
      }
    }));
  }
  handleLastName(e) {
    let value = e.target.value;
    this.setState(prevState => ({
      newUser: {
        ...prevState.newUser,
        lastName: value
      }
    }));
  }

  getFullName() {
    return this.state.newUser.firstName + " " + this.state.newUser.lastName;
  }

  render() {
    return (
      <div>
        <input
          type="text"
          onChange={this.handleFirstName.bind(this)}
          placeholder="Enter first Name"
        />
        <input
          type="text"
          onChange={this.handleLastName.bind(this)}
          placeholder="Enter last Name"
        />
        FullName: {this.getFullName()}
      </div>
    );
  }
}
export default User;

您可以在这里https://codesandbox.io/s/z6422kkvx4

播放

Answer 2

这也许就是您要寻找的东西：

this.setState(prevState => ({ fullName: [...prevState.fullName, { firstName: "", lastName: "" }]

请注意，fullName应该像这样：

    fullName: [{firstName: "", lastName: ""}],

如何在ReactJS中串联名字和姓氏？

2 个答案: