Form in react

React text input onchange

class NameForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {value: ''};
    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChange(event) {    this.setState({value: event.target.value});  }
  handleSubmit(event) {
    alert('A name was submitted: ' + this.state.value);
    event.preventDefault();
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <label>
          Name:
          <input type="text" value={this.state.value} onChange={this.handleChange} />        </label>
        <input type="submit" value="Submit" />
      </form>
    );
  }
}

Source: reactjs.org

Html select react

class FlavorForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {value: 'coconut'};
    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChange(event) {    this.setState({value: event.target.value});  }
  handleSubmit(event) {
    alert('Your favorite flavor is: ' + this.state.value);
    event.preventDefault();
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <label>
          Pick your favorite flavor:
          <select value={this.state.value} onChange={this.handleChange}>            <option value="grapefruit">Grapefruit</option>
            <option value="lime">Lime</option>
            <option value="coconut">Coconut</option>
            <option value="mango">Mango</option>
          </select>
        </label>
        <input type="submit" value="Submit" />
      </form>
    );
  }
}

Source: reactjs.org

Form react

<form>
  <label>
    Nome:
    <input type="text" name="name" />
  </label>
  <input type="submit" value="Enviar" />
</form>

Source: pt-br.reactjs.org

Form in react

  const [inputs, setInputs] = useState({});

  const handleChange = (event) => {
    const name = event.target.name;
    const value = event.target.value;
    setInputs(values => ({...values, [name]: value}))
  }

React Form

import React from "react"

export default function Form() {
    const [formData, setFormData] = React.useState(
        {
            firstName: "", 
            lastName: "", 
            email: "", 
            comments: "", 
            isFriendly: true,
            employment: "",
            favColor: ""
        }
    )
    
    function handleChange(event) {
        const {name, value, type, checked} = event.target
        setFormData(prevFormData => {
            return {
                ...prevFormData,
                [name]: type === "checkbox" ? checked : value
            }
        })
    }
    
    function handleSubmit(event) {
        event.preventDefault()
        // submitToApi(formData)
        console.log(formData)
    }
    
    return (
        <form onSubmit={handleSubmit}>
            <input
                type="text"
                placeholder="First Name"
                onChange={handleChange}
                name="firstName"
                value={formData.firstName}
            />
            <input
                type="text"
                placeholder="Last Name"
                onChange={handleChange}
                name="lastName"
                value={formData.lastName}
            />
            <input
                type="email"
                placeholder="Email"
                onChange={handleChange}
                name="email"
                value={formData.email}
            />
            <textarea 
                value={formData.comments}
                placeholder="Comments"
                onChange={handleChange}
                name="comments"
            />
            <input 
                type="checkbox" 
                id="isFriendly" 
                checked={formData.isFriendly}
                onChange={handleChange}
                name="isFriendly"
            />
            <label htmlFor="isFriendly">Are you friendly?</label>
            <br />
            <br />
            
            <fieldset>
                <legend>Current employment status</legend>
                <input 
                    type="radio"
                    id="unemployed"
                    name="employment"
                    value="unemployed"
                    checked={formData.employment === "unemployed"}
                    onChange={handleChange}
                />
                <label htmlFor="unemployed">Unemployed</label>
                <br />
                
                <input 
                    type="radio"
                    id="part-time"
                    name="employment"
                    value="part-time"
                    checked={formData.employment === "part-time"}
                    onChange={handleChange}
                />
                <label htmlFor="part-time">Part-time</label>
                <br />
                
                <input 
                    type="radio"
                    id="full-time"
                    name="employment"
                    value="full-time"
                    checked={formData.employment === "full-time"}
                    onChange={handleChange}
                />
                <label htmlFor="full-time">Full-time</label>
                <br />
            </fieldset>
            <br />
            
            <label htmlFor="favColor">What is your favorite color?</label>
            <br />
            <select 
                id="favColor" 
                value={formData.favColor}
                onChange={handleChange}
                name="favColor"
            >
                <option value="red">Red</option>
                <option value="orange">Orange</option>
                <option value="yellow">Yellow</option>
                <option value="green">Green</option>
                <option value="blue">Blue</option>
                <option value="indigo">Indigo</option>
                <option value="violet">Violet</option>
            </select>
            <br />
            <br />
            <button>Submit</button>
        </form>
    )
}

React forms

https://dmitripavlutin.com/react-forms-tutorial/

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