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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              body {
  margin: 1em;
}
            
          
!
            
              class MasterForm extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      currentStep: 1,
      email:  '',
      username: '',
      password: '',
      comment: '',
      passwordConfirmation:'',
      formErrors: {
        email: '',
        username:'', 
        password: '', 
        passwordConfirmation: '',
      },
      formValidity: {
        email: false,
        username: false, 
        password: false, 
        passwordConfirmation: false,
      },
      canSubmit: false,
    }
    this.handleChange = this.handleChange.bind(this)
    this._next = this._next.bind(this)
    this._prev = this._prev.bind(this)
  }

  _next() {
    let currentStep = this.state.currentStep
    currentStep = currentStep >= 2? 3: currentStep + 1
    this.setState({
      currentStep: currentStep
    })
  }
   
  _prev() {
    let currentStep = this.state.currentStep
    currentStep = currentStep <= 1? 1: currentStep - 1
    this.setState({
      currentStep: currentStep
    })
  }

  handleChange(event) {
    const {name, value} = event.target
    this.setState({
      [name]: value
    }, function(){ this.validateField(name, value)})
    
  }

  validateField(name, value) {
    if(Object.keys(this.state.formErrors).includes(name)){
      const fieldValidationErrors = this.state.formErrors
      const validity = this.state.formValidity
      const isEmail = name === "email"
      const isPassword = name === "password"
      const isPasswordConfirmation = name === "passwordConfirmation"
      const label = name === "passwordConfirmation"? 'password confirmation' : name
      const emailTest = /^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/i
  
      validity[name] = value.length >0
      fieldValidationErrors[name] = validity[name] ? '': `${label} is required and cannot be empty`
  
      if(validity[name]) {
        if(isPassword){
          validity[name] = value.length >= 5
          fieldValidationErrors[name] = validity[name] ? '': `${label} should be 5 characters or more`
        }
        if(isEmail){
          validity[name] = emailTest.test(value)
          fieldValidationErrors[name] = validity[name] ? '' : `${label} should be a valid email address`
        }
        if(isPasswordConfirmation){
          validity[name] = value === this.state.password
          fieldValidationErrors[name] = validity[name] ? '' : `${label} should match password`
        }
      }
    
      this.setState({
        formErrors: fieldValidationErrors,
        formValidity: validity,
      }, () => this.canSubmit())
    }
  }

  canSubmit() {
    this.setState({canSubmit: this.state.formValidity.email && this.state.formValidity.username && this.state.formValidity.password && this.state.formValidity.passwordConfirmation})
  }

  errorClass(error) {
    return(error.length === 0 ? '' : 'is-invalid')
  }
   
  handleSubmit = (event) => {
    event.preventDefault()
    const { email, username, password } = this.state
    alert(`Your registration detail: \n 
           Email: ${email} \n 
           Username: ${username} \n
           Password: ${password}`)
  }

  get previousButton(){
    let currentStep = this.state.currentStep
    if(currentStep !==1){
      return (
        <button className="btn btn-secondary" type="button" onClick={this._prev}>Previous</button>
      )
    }
    return null
  }

  get nextButton(){
    let currentStep = this.state.currentStep
    if(currentStep <3){
      return (
        <button className="btn btn-primary float-right" type="button" onClick={this._next}>Next</button>        
      )
    }
    return null
  }
  
  render() {    
    return (
      <React.Fragment>
      <h1>A Wizard Form!</h1>
      <p>Step {this.state.currentStep} </p> 
       
      <form onSubmit={this.handleSubmit}>
        <Step1 
          currentStep={this.state.currentStep} 
          handleChange={this.handleChange}
          errorEmailClass={this.errorClass(this.state.formErrors.email)}
          email={this.state.email}
          errorEmail={this.state.formErrors.email}
          errorUsernameClass={this.errorClass(this.state.formErrors.username)}
          username={this.state.username}
          errorUsername={this.state.formErrors.username}
        />
        <Step2 
        currentStep={this.state.currentStep} 
        handleChange={this.handleChange}
        errorPasswordClass={this.errorClass(this.state.formErrors.password)}
        password={this.state.password}
        errorPassword={this.state.formErrors.password}
        errorPasswordConfirmationClass={this.errorClass(this.state.formErrors.passwordConfirmation)}
        passwordConfirmation={this.state.passwordConfirmation}
        errorPasswordConfirmation={this.state.formErrors.passwordConfirmation}
        />
        <Step3 
          currentStep={this.state.currentStep} 
          handleChange={this.handleChange}
          comment={this.state.comment}
          canSubmit={this.state.canSubmit}
        />
        {this.previousButton}
        {this.nextButton}
        

      </form>
      </React.Fragment>
    )
  }
}

class Step1 extends React.Component {
  render() {
    if (this.props.currentStep !== 1) {
      return null
    } 
    return(
      <React.Fragment>
      <div className="form-group">
        <label htmlFor="email">Email address</label>
        <input
          className={`form-control ${this.props.errorEmailClass}`}
          id="email"
          name="email"
          type="text"
          placeholder="Enter email"
          value={this.props.email}
          onChange={this.props.handleChange}
        />
        <div className="invalid-feedback">{this.props.errorEmail}</div>
      </div>
      <div className="form-group">
      <label htmlFor="username">Username</label>
      <input
        className={`form-control ${this.props.errorUsernameClass}`}
        id="username"
        name="username"
        type="text"
        placeholder="Enter username"
        value={this.props.username}
        onChange={this.props.handleChange}
      />
      <div className="invalid-feedback">{this.props.errorUsername}</div>
    </div>
    </React.Fragment>
   )
 }
}

class Step2 extends React.Component {
  render() {
    if (this.props.currentStep !== 2) {
      return null
    } 
    return(
    <React.Fragment>
    <div className="form-group">
        <label htmlFor="password">Password</label>
        <input
          className={`form-control ${this.props.errorPasswordClass}`}
          id="password"
          name ="password"
          type="password"
          placeholder="Enter password"
          value={this.props.password}
          onChange={this.props.handleChange}
        />
        <div className="invalid-feedback">{this.props.errorPassword}</div>
      </div> 

      <div className="form-group">
        <label htmlFor="passwordConfirmation">Password Confirmation</label>
        <input
          className={`form-control ${this.props.errorPasswordConfirmationClass}`}
          id="passwordConfirmation"
          name ="passwordConfirmation"
          type="password"
          placeholder="Enter password again"
          value={this.props.passwordConfirmation}
          onChange={this.props.handleChange}
        />
        <div className="invalid-feedback">{this.props.errorPasswordConfirmation}</div>
      </div>
    </React.Fragment>
  )
 }
}

class Step3 extends React.Component {
  render() {
    if (this.props.currentStep !== 3) {
      return null
    } 
    return(
    <React.Fragment>
      <div className="form-group">
        <label htmlFor="comment"> Comment:</label>
          <textarea 
          className="form-control"
          id="comment"
          name="comment" 
          value={this.props.comment} 
          onChange={this.props.handleChange} />
      </div>       
      <button className="btn btn-success btn-block" disabled={!this.props.canSubmit}>Sign up</button>
    </React.Fragment>
  )
 }
}

ReactDOM.render(<MasterForm />, document.getElementById('root'))
            
          
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