antd4 form表单使用

antd4.x form使用实例：

// AntdForm4.js class组件形式
import React, { Component, useEffect } from "react";
import { Form, Input, Button } from "antd";
const FormItem = Form.Item;
const nameRules = { required: true, message: "请输入姓名" };
const passwordRules = { required: true, message: "请输入密码" };

export default class AntdFormPage extends Component {
  formRef = React.createRef();
  componentDidMount() {
    this.formRef.current.setFieldsValue({ name: "default name" });
  }
  onReset = () => {
    this.formRef.current.resetFields();
  };
  onFinish = (val) => {
    console.log("onfinish", val);
  };
  onFinishFailed = (val) => {
    console.log("onfinishfailed", val);
  };
  render() {
    console.log("antd render", this.formRef.current);
    return (
      <div>
        <Form
          ref={this.formRef}
          onFinish={this.onFinish}
          onFinishFailed={this.onFinishFailed}
          onReset={this.onReset}
        >
          <FormItem label="姓名" name="name" rules={[nameRules]}>
            <Input placeholder="name" />
          </FormItem>
          <FormItem label="密码" name="password" rules={[passwordRules]}>
            <Input placeholder="password" />
          </FormItem>
          <FormItem>
            <Button type="primary" size="large" htmlType="submit">
              submit
            </Button>
          </FormItem>
          <FormItem>
            <Button type="default" size="large" htmlType="reset">
              reset
            </Button>
          </FormItem>
        </Form>
      </div>
    );
  }
}

　　

// AntdForm4.js function组件形式
import React, { Component, useEffect } from "react";
import { Form, Input, Button } from "antd";
const FormItem = Form.Item;
const nameRules = { required: true, message: "姓名" };
const passwordRules = { required: true, message: "Mim " };
export default function AntdFormPage(props) {
  const [form] = Form.useForm();
  const onFinish = (val) => {
    console.log("onfinish", val);
  };
  const onFinishFailed = (val) => {
    console.log("onFinishFailed", val);
  };
  useEffect(() => {
    console.log("form", form);
    form.setFieldsValue({ name: "default name" });
  }, []);
  return (
    <div>
      <h3>AntdFormPage</h3>
      <Form form={form} onFinish={onFinish} onFinishFailed={onFinishFailed}>
        <FormItem label="姓名" name="name" rules={[nameRules]}>
          <Input placeholder="name" />
        </FormItem>
        <FormItem label="密码" name="password" rules={[passwordRules]}>
          <Input placeholder="password" />
        </FormItem>
        <FormItem>
          <Button type="primary" size="large" htmlType="submit">
            submit
          </Button>
        </FormItem>
      </Form>
    </div>
  );
}

　　

// App.js
import React from "react";
import AntdFormPage from "./pages/AntdForm4.js";

function App() {
  return (
    <div className="App">
      <AntdFormPage />
    </div>
  );
}

export default App;