基于语义用户界面的表单验证

Question

我正在使用官方的语义用户界面反应组件来创建一个web应用程序。我的注册页面上有一个表单，其中包含一个电子邮件字段、一个密码字段和一个确认密码字段。

import {Component} from 'react';
import {Button, Form, Message} from 'semantic-ui-react';
import {signUp} from '../../actions/auth';

class SignUp extends Component {
    constructor(props) {
        super(props);
        this.handleSubmit = this.handleSubmit.bind(this);
    }
    handleSubmit(e, {formData}) {
        e.preventDefault();

        //
        // Potentially need to manually validate fields here?
        //

        // Send a POST request to the server with the formData
        this.props.dispatch(signUp(formData)).then(({isAuthenticated}) => {
            if (isAuthenticated) {
                // Redirect to the home page if the user is authenticated
                this.props.router.push('/');
            }
        }
    }
    render() {
        const {err} = this.props;

        return (
            <Form onSubmit={this.handleSubmit} error={Boolean(err)}>
                <Form.Input label="Email" name="email" type="text"/>
                <Form.Input label="Password" name="password" type="password"/>
                <Form.Input label="Confirm Password" name="confirmPassword" type="password"/>

                {err &&
                    <Message header="Error" content={err.message} error/>
                }

                <Button size="huge" type="submit" primary>Sign Up</Button>
            </Form>
        );
    }
}

现在，我已经习惯了常规的语义UI库，它有一个形式验证副词。通常，我会像这样在一个单独的JavaScript文件中定义规则

$('.ui.form').form({
    fields: {
        email: {
            identifier: 'email',
            rules: [{
                type: 'empty',
                prompt: 'Please enter your email address'
            }, {
                type: 'regExp',
                value: "[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?",
                prompt: 'Please enter a valid email address'
            }]
        },
        password: {
            identifier: 'password',
            rules: [{
                type: 'empty',
                prompt: 'Please enter your password'
            }, {
                type: 'minLength[8]',
                prompt: 'Your password must be at least {ruleValue} characters'
            }]
        },
        confirmPassword: {
            identifier: 'confirmPassword',
            rules: [{
                type: 'match[password]',
                prompt: 'The password you provided does not match'
            }]
        }
    }
});

是否有类似的方法使用语义UI React组件来验证表单？我对文档进行了搜索，但没有任何成功，而且似乎没有使用这个语义UI React库进行验证的例子。

我是否需要手工验证handleSubmit函数中的每个字段？解决这个问题的最好方法是什么？谢谢你的帮助！

Answer 1

我们甚至还有一个更好的选择，尽管语义用户界面-react -> 福米克 + 是的没有提供这种选项。

Formik:帮助管理表单状态Yup:帮助验证该状态

我有下面的组件，它基本上是使用语义-ui-react创建的编辑表单。

import React, { Component } from "react";
import { Button, Form, Modal, Message, Divider } from "semantic-ui-react";
import { Formik } from "formik";
import * as yup from "yup";


class EditAboutGrid extends Component {

  render() {
    const {
      userBasic,
      editBasicModal,
      closeModal
    } = this.props;

    return (
      <Formik
        initialValues={{
          firstName: userBasic.firstName,
          lastName: userBasic.lastName,
          bio: userBasic.bio,
        }}
        validationSchema={yup.object().shape({
          firstName: yup
            .string()
            .required("Name cannot be empty"),
          lastName: yup
            .string()
            .required("Name cannot be empty"),
          bio: yup
            .string()
            .max(1000, "Maximum characters exceed 1000")
            .nullable()
        })}
        onSubmit={(values, actions) => {
          //do your stuff here like api calls
        }}
        render={({
          values,
          errors,
          handleChange,
          handleSubmit,
          isSubmitting,
          dirty,
          setFieldValue
        }) => (
          <Modal open={editBasicModal} size="small">
            <Modal.Header>Your basic details</Modal.Header>
            <Modal.Content scrolling>
              {errors.firstName && <Message error content={errors.firstName} />}
              {errors.lastName && <Message error content={errors.lastName} />}
              {errors.bio && <Message error content={errors.bio} />}

              <Form loading={isSubmitting}>
                <Form.Group inline widths="equal">
                  <Form.Input
                    required
                    label="First Name"
                    fluid
                    type="text"
                    name="firstName"
                    value={values.firstName}
                    onChange={handleChange}
                    error={errors.firstName !== undefined}
                  />
                  <Form.Input
                    required
                    label="Last Name"
                    fluid
                    type="text"
                    name="lastName"
                    value={values.lastName}
                    onChange={handleChange}
                    error={errors.lastName !== undefined}
                  />
                </Form.Group>
                <Form.TextArea
                  label="Bio"
                  type="text"
                  name="bio"
                  value={values.bio}
                  onChange={handleChange}
                  rows={3}
                  error={errors.bio !== undefined}
                />
              </Form>
            </Modal.Content>
            <Modal.Actions open={true}>
              <Button
                onClick={() => (dirty ? closeModal(true) : closeModal(false))}>
                Cancel
              </Button>
              <Button
                primary
                type="submit"
                onClick={handleSubmit}
                loading={isSubmitting}
                disabled={isSubmitting || !isEmpty(errors) || !dirty}>
                Update
              </Button>
            </Modal.Actions>
          </Modal>
        )}
      />
    );
  }
}

这个表单的名称是：

  <EditAboutGrid
    editBasicModal={this.state.editBasicModal}
    userBasic={this.state.user.basic}
    closeModal={this.closeModal}
  />

initialValues是事情开始的地方。在这里，您将初始/默认值传递给表单的输入。values(在表单中)将从此默认值中选择数据值。

validationSchema是使用yup进行所有验证的地方。

提交表单时将调用onSubmit。

使用Formik + yup处理表单非常容易。我很喜欢它。

Answer 2

在大多数情况下，您必须手工验证表单。然而，RSUI包含了一些工具来使事情变得更简单，特别是在<Form>和<Form.Input>上的错误道具。

下面是我最近整理的一个表格的例子。它可以使用一些重构，但它的基本工作方式是将每个输入与一个onChange()函数绑定到状态，并将一个回调传递给submit函数，该函数控制加载屏幕的可见性和表单的“成功”。谢谢您提交表单的部分。

export default class MeetingFormModal extends Component {

  constructor(props) {
    super(props)

    this.state = {
      firstName: '',
      lastName: '',
      email: '',
      location: '',
      firstNameError: false,
      lastNameError: false,
      emailError: false,
      locationError: false,
      formError: false,
      errorMessage: 'Please complete all required fields.',
      complete: false,
      modalOpen: false
    }

    this.submitMeetingForm = this.submitMeetingForm.bind(this);
    this.successCallback = this.successCallback.bind(this);
  }


  successCallback() {
    this.setState({
      complete: true
    })
    setTimeout( () => {this.setState({modalOpen: false})}, 5000);
    this.props.hideLoading();
  }

  handleClose = () => this.setState({ modalOpen: false })
  handleOpen = () => this.setState({ modalOpen: true })

  submitMeetingForm() {

    let error = false;

    if (this.state.studentFirstName === '') {
      this.setState({firstNameError: true})
      error = true
    } else {
      this.setState({firstNameError: false})
      error = false
    }
    if (this.state.studentLastName === '') {
      this.setState({lastNameError: true})
      error = true
    } else {
      this.setState({lastNameError: false})
      error = false
    }
    if (this.state.email === '') {
      this.setState({emailError: true})
      error = true
    } else {
      this.setState({emailError: false})
      error = false
    }
    if (this.state.location === '') {
      this.setState({locationError: true})
      error = true
    } else {
      this.setState({locationError: false})
      error = false
    }

    if (error) {
      this.setState({formError: true})
      return
    } else {
      this.setState({formError: false})
    }


    let meeting = {
      first_name: this.state.firstName,
      last_name: this.state.lastName,
      email: this.state.email,
      location: this.state.location,

    this.props.createMeeting(meeting, this.successCallback)
    this.props.showLoading();
  }

  capitalize(string) {
    return string.charAt(0).toUpperCase() + string.slice(1);
  }

  render() {
    return(
      <Modal
        trigger={<Button onClick={this.handleOpen} basic color='blue'>Schedule Now</Button>}
        open={this.state.modalOpen}
        onClose={this.handleClose}
        closeIcon={true}
      >
        <Modal.Header>Schedule Your Interview</Modal.Header>
        <Modal.Content>
          {!this.state.complete ?
          <Modal.Description>
            <Form error={this.state.formError}>
              <Form.Group widths='equal'>
                <Form.Field>
                  <Form.Input required={true} onChange={(e) => this.setState({firstName: e.target.value})} label='First Name' placeholder="First Name..." error={this.state.firstNameError}/>
                </Form.Field>
                <Form.Field>
                  <Form.Input required={true} onChange={(e) => this.setState({lastName: e.target.value})} label='Last Name' placeholder="Last Name..." error={this.state.lastNameError}/>
                </Form.Field>
              </Form.Group>
              <Form.Field >
                <Form.Input required={true} onChange={(e) => this.setState({email: e.target.value})} label='Email' placeholder="Email..." error={this.state.emailError}/>
              </Form.Field>
              <Form.Field>
                <Form.Input required={true} onChange={(e) => this.setState({location: e.target.value})} label='Location' placeholder='City, State/Province, Country...' error={this.state.locationError}/>
              </Form.Field>
            </Form>
          </Modal.Description>
          : 
            <div className='modal-complete'>
              <Image src='/images/check.png' />
              <p>Thanks for scheduling a meeting, {this.capitalize(this.state.name)}. We've received your information and we'll be in touch shortly.</p>
            </div>
          }
        </Modal.Content>
        {!this.state.complete ?
        <Modal.Actions>
          <Button color='red' onClick={this.handleClose}>Close</Button>
          <Button positive icon='checkmark' labelPosition='right' content="Submit" onClick={this.submitMeetingForm} />
        </Modal.Actions>
        : null }
      </Modal>
    )
  }
}

希望这能帮上忙！

Answer 3

我知道这个问题有好几年的历史了，但这是我在使用(相对的)较新的和Hooks时遇到的困难。在我的例子中，我只想验证用户输入是否是一个有效的电子邮件地址。最后，我得到了我正在寻找的行为与下面的代码。

import React, {useState} from 'react';
import { Form } from 'semantic-ui-react'
import EmailValidator from 'email-validator';


function MyFormComponentExample() {
    const [emailInput, setEmail] = useState("");
    const [validEmail, validateEmail] = useState(true);

    return (
    <Form>
        <Form.Input
            icon='envelope'
            iconPosition='left'
            label='Email'
            placeholder='Email Address'
            required
            value={emailInput}
            onChange={e => {
                setEmail(e.target.value);                               
                validateEmail(EmailValidator.validate(e.target.value));
            }}
            error={validEmail ? false : {
                content: 'Please enter a valid email address.',
                pointing: 'below'
            }}
        />
    </Form>
    );
}

export default MyFormComponentExample;

一旦我明白了，我认为这个结构很简单，但是如果有人对更好的模式或方法有反馈，我很想听听！