React State Usage in New Version - reactjs

I am new to react,
Currently we are using new version of react,
The new version of react state (Current Version):
class MyForm extends React.Component {
const [state, setState] = useState([]);
myChangeHandler = (event) => {
let nam = event.target.name;
let val = event.target.value;
setState({[nam]: val});
}
render() {
return (
<form>
<h1>Hello {state.username} {state.age}</h1>
<p>Enter your name:</p>
<input
type='text'
name='username'
onChange={myChangeHandler}
/>
<p>Enter your age:</p>
<input
type='text'
name='age'
onChange={myChangeHandler}
/>
</form>
);
}
}
How to i define it in the old React.
class MyForm extends React.Component {
constructor(props) {
super(props);
this.state = {
username: '',
age: null,
};
}
myChangeHandler = (event) => {
let nam = event.target.name;
let val = event.target.value;
this.setState({[nam]: val});
}
render() {
return (
<form>
<h1>Hello {this.state.username} {this.state.age}</h1>
<p>Enter your name:</p>
<input
type='text'
name='username'
onChange={this.myChangeHandler}
/>
<p>Enter your age:</p>
<input
type='text'
name='age'
onChange={myChangeHandler}
/>
</form>
);
}
}
I have used it similar to the old one but the age value in state is cleared when the name state is updated and viceversa

Issues
React hooks are only valid in functional components.
You are using an array for state when it's an object in old code.
Unlike class-based component's this.setState state updates are not shallowly merged, you need to manage this yourself.
There is no render method, the entire functional component body is the "render" function. Just return the JSX.
Solution
const MyForm = () => {
const [state, setState] = useState({ // <-- use object
age: null,
username: '',
});
const myChangeHandler = (event) => {
const { name, value } = event.target;
setState(state => ({
...state, // <-- copy previous state
[name]: val, // <-- update property
}));
}
return (
<form>
<h1>Hello {state.username} {state.age}</h1>
<p>Enter your name:</p>
<input
type='text'
name='username'
onChange={myChangeHandler}
/>
<p>Enter your age:</p>
<input
type='text'
name='age'
onChange={myChangeHandler}
/>
</form>
);
}

function MyForm() {
const [name, setName] = useState('');
const [age, setAge] = useState(0);
return (
<form>
<h1>Hello {state.username} {state.age}</h1>
<p>Enter your name:</p>
<input
type='text'
name='username'
onChange={(event) => setName(event.target.value)}
/>
<p>Enter your age:</p>
<input
type='text'
name='age'
onChange={(event) => setAge(event.target.value)}
/>
</form>
);
}

Related

remove the value enterd in input fild after submistion :react js [duplicate]

I have a form containing various input fields and two buttons; one for submitting and one for cancelling.
<form id="create-course-form">
<input type="text" name="course_Name" ref="fieldName">
<input type="text" name="course_org" ref="fieldOrg">
<input type="text" name="course_Number" ref="fieldNum">
<input type="submit" name="saveCourse" value="Create">
<input type="button" name="cancelCourse" value="cancel" onClick={this.cancelCourse}>
</form>
What I want is to empty all inputs when the cancel button is clicked. So far I've managed to do this by using each input's ref prop.
cancelCourse(){
this.refs.fieldName.value="";
this.refs.fieldorg.value="";
this.refs.fieldNum.value="";
}
However, I want to empty the input fields without having to empty each one seperately. I want something similar to this (jQuery): $('#create-course-form input[type=text]').val('');
The answer here depends on whether or not your inputs are controlled or uncontrolled. If you are unsure or need more info on this, check out what the official docs say about controlled components and uncontrolled components. Thanks #Dan-Esparza for providing the links.
Also, please note that using string literals in ref is deprecated. Use the standard callback method instead.
Clearing a form with uncontrolled fields
You can clear the entire form rather than each form field individually.
cancelCourse = () => {
document.getElementById("create-course-form").reset();
}
render() {
return (
<form id="create-course-form">
<input />
<input />
...
<input />
</form>
);
}
If your form didn't have an id attribute you could use a ref as well:
cancelCourse = () => {
this.myFormRef.reset();
}
render() {
return (
<form ref={(el) => this.myFormRef = el;}>
<input />
<input />
...
<input />
</form>
);
}
Clearing a form with controlled fields
If you are using controlled form fields, you may have to explicitly reset each component inside your form, depending on how your values are stored in the state.
If they are declared individually, you need to reset each one explicitly:
cancelCourse = () => {
this.setState({
inputVal_1: "",
inputVal_2: "",
...
inputVal_n: "",
});
}
render() {
return (
<input value={this.state.inputVal_1} onChange={this.handleInput1Change}>
<input value={this.state.inputVal_2} onChange={this.handleInput2Change}>
...
<input value={this.state.inputVal_n} onChange={this.handleInputnChange}>
);
}
Demo below:
class MyApp extends React.Component {
constructor() {
super();
this.state = {
inputVal_1: "",
inputVal_2: "",
inputVal_3: "",
inputVal_4: "",
inputVal_5: "",
inputVal_6: "",
inputVal_7: "",
inputVal_8: "",
inputVal_9: "",
inputVal_10: ""
};
}
handleInput1Change = (e) => {
this.setState({inputVal_1: e.target.value});
}
handleInput2Change = (e) => {
this.setState({inputVal_2: e.target.value});
}
handleInput3Change = (e) => {
this.setState({inputVal_3: e.target.value});
}
handleInput4Change = (e) => {
this.setState({inputVal_4: e.target.value});
}
handleInput5Change = (e) => {
this.setState({inputVal_5: e.target.value});
}
handleInput6Change = (e) => {
this.setState({inputVal_6: e.target.value});
}
handleInput7Change = (e) => {
this.setState({inputVal_7: e.target.value});
}
handleInput8Change = (e) => {
this.setState({inputVal_8: e.target.value});
}
handleInput9Change = (e) => {
this.setState({inputVal_9: e.target.value});
}
handleInput10Change = (e) => {
this.setState({inputVal_10: e.target.value});
}
cancelCourse = () => {
this.setState({
inputVal_1: "",
inputVal_2: "",
inputVal_3: "",
inputVal_4: "",
inputVal_5: "",
inputVal_6: "",
inputVal_7: "",
inputVal_8: "",
inputVal_9: "",
inputVal_10: ""
});
}
render() {
return (
<form>
<input value={this.state.inputVal_1} onChange={this.handleInput1Change} />
<input value={this.state.inputVal_2} onChange={this.handleInput2Change} />
<input value={this.state.inputVal_3} onChange={this.handleInput3Change} />
<input value={this.state.inputVal_4} onChange={this.handleInput4Change} />
<input value={this.state.inputVal_5} onChange={this.handleInput5Change} />
<input value={this.state.inputVal_6} onChange={this.handleInput6Change} />
<input value={this.state.inputVal_7} onChange={this.handleInput7Change} />
<input value={this.state.inputVal_8} onChange={this.handleInput8Change} />
<input value={this.state.inputVal_9} onChange={this.handleInput9Change} />
<input value={this.state.inputVal_10} onChange={this.handleInput10Change} />
<input type="submit" name="saveCourse" value="Create" />
<input type="button" name="cancelCourse" value="cancel" onClick={this.cancelCourse} />
</form>
);
}
}
ReactDOM.render(<MyApp />, document.getElementById("app"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="app"></div>
There is a cleaner way to do this though. Rather than having n state properties and n event handlers, one for each input, with some clever coding we can reduce the code dramatically.
In the constructor we just declare an empty object, which will be used to hold input values. We use only one input handler and pass it the index of the input element we want to change the value of. This means that the value of an individual input is generated the moment we start typing into it.
To reset the form, we only need to set our input object back to being empty again.
The input value is this.state.inputVal[i]. If i doesn't exist (we haven't typed anything yet into that input) we want the value to be an empty string (instead of null).
cancelCourse = () => {
this.setState({inputVal: {}});
}
render() {
return (
<form>
{[...Array(n)].map(
(item, i) => <input value={this.state.inputVal[i] || ""} onChange={this.handleInputChange.bind(this, i)} />
)}
</form>
);
}
Demo below:
class MyApp extends React.Component {
constructor() {
super();
this.state = {
inputVal: {}
};
}
handleInputChange = (idx, {target}) => {
this.setState(({inputVal}) => {
inputVal[idx] = target.value;
return inputVal;
});
}
cancelCourse = () => {
this.setState({inputVal: {}});
}
render() {
return(
<form>
{[...Array(10)].map( //create an array with a length of 10
(item, i) => <input value={this.state.inputVal[i] || ""} onChange={this.handleInputChange.bind(this, i)} /> //bind the index to the input handler
)}
<input type="submit" name="saveCourse" value="Create" />
<input type="button" name="cancelCourse" value="cancel" onClick={this.cancelCourse} />
</form>
);
}
}
ReactDOM.render(<MyApp />, document.getElementById("app"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="app"></div>
Very easy:
handleSubmit(e){
e.preventDefault();
e.target.reset();
}
// If using class component
<form onSubmit={this.handleSubmit.bind(this)}>
...
</form>
// If using function component
<form onSubmit={handleSubmit}>
...
</form>
Using event.target.reset() only works for uncontrolled components, which is not recommended. For controlled components you would do something like this:
import React, { Component } from 'react'
class MyForm extends Component {
initialState = { name: '' }
state = this.initialState
handleFormReset = () => {
this.setState(() => this.initialState)
}
render() {
return (
<form onReset={this.handleFormReset}>
<div>
<label htmlFor="name">Name</label>
<input
type="text"
placeholder="Enter name"
name="name"
value={name}
onChange={this.handleInputOnChange}
/>
</div>
<div>
<input
type="submit"
value="Submit"
/>
<input
type="reset"
value="Reset"
/>
</div>
</form>
)
}
}
ContactAdd.propTypes = {}
export default MyForm
You can also do it by targeting the current input, with anything.target.reset() . This is the most easiest way!
handleSubmit(e){
e.preventDefault();
e.target.reset();
}
<form onSubmit={this.handleSubmit}>
...
</form>
Here's an update to Chris's answer above, using modern React hooks.
Same high level idea; your form can be either a Controlled or Uncontrolled component.
Uncontrolled components:
Uncontrolled components leave state management up to the browser. That means you have to ask the browser to reset the form inputs. To do that, capture the form element as a ref, and then call the submit() method on that element.
export default function Form() {
const ref = React.useRef();
function reset(ev) {
ev.preventDefault();
ref.current.reset();
}
return (
<form ref={ref}>
<label htmlFor="email">Email Address</label>
<input id="email" type="email" name="email" />
<label htmlFor="message">Message</label>
<textarea id="message" name="message" />
<button type="submit">Submit</button>
<button onClick={reset}>Reset</button>
</form>
);
}
Controlled components:
With a controlled component, you manage the state in React. That means you have to create the initial state, and update it every time an input changes. In this world, resetting the form is just a matter of setting the form state back to its initial state.
export default function Form() {
const [state, setState] = React.useState({ email: "", message: "" });
function reset(ev) {
ev.preventDefault();
setState({ email: "", message: "" });
}
return (
<form className="Form">
<label htmlFor="email">Email Address</label>
<input
id="email"
type="email"
name="email"
value={state.email}
onChange={(ev) => {
setState({ ...state, email: ev.target.value });
}}
/>
<label htmlFor="message">Message</label>
<textarea
id="message"
name="message"
value={state.message}
onChange={(ev) => {
setState({ ...state, message: ev.target.value });
}}
/>
<button type="submit">Submit</button>
<button onClick={reset}>Reset</button>
</form>
);
}
Full example at https://codesandbox.io/s/reactformreset-10cjn3
Following code should reset the form in one click.
import React, { Component } from 'react';
class App extends Component {
constructor(props){
super(props);
this.handleSubmit=this.handleSubmit.bind(this);
}
handleSubmit(e){
this.refs.form.reset();
}
render(){
return(
<div>
<form onSubmit={this.handleSubmit} ref="form">
<input type="text" placeholder="First Name!" ref='firstName'/><br/<br/>
<input type="text" placeholder="Last Name!" ref='lastName'/><br/><br/>
<button type="submit" >submit</button>
</form>
</div>
}
}
To clear your form, admitted that your form's elements values are saved in your state, you can map through your state like that :
// clear all your form
Object.keys(this.state).map((key, index) => {
this.setState({[key] : ""});
});
If your form is among other fields, you can simply insert them in a particular field of the state like that:
state={
form: {
name:"",
email:""}
}
// handle set in nested objects
handleChange = (e) =>{
e.preventDefault();
const newState = Object.assign({}, this.state);
newState.form[e.target.name] = e.target.value;
this.setState(newState);
}
// submit and clear state in nested object
onSubmit = (e) =>{
e.preventDefault();
var form = Object.assign({}, this.state.form);
Object.keys(form).map((key, index) => {
form[key] = "" ;
});
this.setState({form})
}
This one works best to reset the form.
import React, { Component } from 'react'
class MyComponent extends Component {
constructor(props){
super(props)
this.state = {
inputVal: props.inputValue
}
// preserve the initial state in a new object
this.baseState = this.state ///>>>>>>>>> note this one.
}
resetForm = () => {
this.setState(this.baseState) ///>>>>>>>>> note this one.
}
submitForm = () => {
// submit the form logic
}
updateInput = val => this.setState({ inputVal: val })
render() {
return (
<form>
<input
onChange={this.updateInput}
type="text
value={this.state.inputVal} />
<button
onClick={this.resetForm}
type="button">Cancel</button>
<button
onClick={this.submitForm}
type="submit">Submit</button>
</form>
)
}
}
When the form is submitted, the 'event' will be passed as an argument to the handleSubmit method, and if that you can access the <form> element by typing event.target. then you just need to reset the form using .reset() form method.
https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/reset
handleSubmit = (event)=>{
event.preventDefault()
....
event.target.reset()
}
render() {
return (
<>
<form onSubmit={this.handleSubmit}>
<label htmlFor='movieTitle'>Title</label>
<input name='movieTitle' id='movieTitle' type='text' />
<input type='submit' value='Find Movie Info' />
</form>
</>
)
}
I don't know if this is still relevant. But when I had similar issue this is how I resolved it.
Where you need to clear an uncontrolled form you simply do this after submission.
this.<ref-name-goes-here>.setState({value: ''});
Hope this helps.
import React, { Component } from 'react'
export default class Form extends Component {
constructor(props) {
super(props)
this.formRef = React.createRef()
this.state = {
email: '',
loading: false,
eror: null
}
}
reset = () => {
this.formRef.current.reset()
}
render() {
return (
<div>
<form>
<input type="email" name="" id=""/>
<button type="submit">Submit</button>
<button onClick={()=>this.reset()}>Reset</button>
</form>
</div>
)
}
}
/*
See newState and use of it in eventSubmit() for resetting all the state.
I have tested it is working for me. Please let me know for mistakes
*/
import React from 'react';
const newState = {
fullname: '',
email: ''
}
class Form extends React.Component {
constructor(props) {
super(props);
this.state = {
fullname: ' ',
email: ' '
}
this.eventChange = this
.eventChange
.bind(this);
this.eventSubmit = this
.eventSubmit
.bind(this);
}
eventChange(event) {
const target = event.target;
const value = target.type === 'checkbox'
? target.type
: target.value;
const name = target.name;
this.setState({[name]: value})
}
eventSubmit(event) {
alert(JSON.stringify(this.state))
event.preventDefault();
this.setState({...newState});
}
render() {
return (
<div className="container">
<form className="row mt-5" onSubmit={this.eventSubmit}>
<label className="col-md-12">
Full Name
<input
type="text"
name="fullname"
id="fullname"
value={this.state.fullname}
onChange={this.eventChange}/>
</label>
<label className="col-md-12">
email
<input
type="text"
name="email"
id="email"
value={this.state.value}
onChange={this.eventChange}/>
</label>
<input type="submit" value="Submit"/>
</form>
</div>
)
}
}
export default Form;
the easiest way is doing it regularly with just HTML and using the button type "reset" there is no need to mess with anything in react at all, no state, no nothing.
import React, {useState} from 'react'
function HowReactWorks() {
return (
<div>
<form>
<div>
<label for="name">Name</label>
<input type="text" id="name" placeholder="name" />
</div>
<div>
<label for="password">Password</label>
<input type="password" id="password" placeholder="password" />
</div>
<button type="reset">Reset</button>
<button>Submit</button>
</form>
</div>
)
}
export default HowReactWorks
edited for the people that don't know how to include HTML in react
You can use this method as well
const resetData = (e) => {
e.preventDefault();
settitle("");
setdate("");
};
<input type="text" onChange={(e) => settitle(e.target.value)} value={title} />
<input type="date" onChange={(e) => setdate(e.target.value)} value={date} />
<button onClick={resetData}>Reset Data</button>
This is the solution that worked for me, in the case of parent component triggering reset of child controlled input components:
const ParentComponent = () => {
const [reset, setReset] = useState()
const submitHandler = (e) => {
e.preventDefault()
//do your stuff
setReset(Date.now()) // pass some value to trigger update
}
return (
<form onSubmit={submitHandler}>
<ChildInputComponent reset={reset} />
<ChildInputComponent reset={reset} />
</form>
)
}
const ChildInputComponent = ({reset}) => {
const [value, setValue] = useState()
useEffect(() => {
setValue('')
}, [reset])
return <input value={value} onChange={(e) => setValue(e.target.value)} />
}
Assuming you declared
const [inputs, setInputs] = useState([]);
As multiple parameters. You can actually reset the items using this syntax:
setInputs([]);
Just in case, this how you define handleChange.
You can use this form or any ways you want.
const handleChange = (event) => {
const name = event.target.name;
const email = event.target.email;
const message = event.target.message;
const value = event.target.value;
setInputs(values => ({...values, [name]: value, [email]: value, [message]: value}))
}
You can use this form as an example.
<form onSubmit={handleSubmit}>
<div className="fields">
<div className="field half">
<label for="name">Name</label>
<input value={inputs.name || ''} type="text" name="name" id="nameId" onChange={handleChange} maxLength="30" />
</div>
<div className="field half">
<label for="email">Email</label>
<input value={inputs.email || ''} type="text" name="email" id="emailId" onChange={handleChange} maxLength="40"/>
</div>
<div className="field">
<label for="message">Message</label>
<textarea value={inputs.message || ''} name="message" id="messageId" rows="6" onChange={handleChange} maxLength="400" />
</div>
</div>
<ul className="actions">
<li><input type="submit" value="Send Message" className="primary" /></li>
<li><input onClick={resetDetails} type="reset" value="Clear" /></li>
</ul>
</form>
This is just one of many ways to declare forms. Good luck!
const onReset = () => {
form.resetFields();
};
state={
name:"",
email:""
}
handalSubmit = () => {
after api call
let resetFrom = {}
fetch('url')
.then(function(response) {
if(response.success){
resetFrom{
name:"",
email:""
}
}
})
this.setState({...resetFrom})
}
Why not use HTML-controlled items such as <input type="reset">

How to use the updated state after setState call with react-hook

How to use the updated state after setState call. In my below code, I am getting the previous state value.
For array below technique works.
setState(currentState => [...currentState, {name, value}]);
But for object, its not working.
import React, { useState } from "react";
export default function App() {
const [state, setState] = useState({});
const handleChange = e => {
const { name, value } = e.target;
setState(currentState => ({ ...currentState, [name]: value }));
console.log(state[name]);
};
const handleSubmit = e => {
e.preventDefault();
console.log(state);
};
return (
<div className="App">
<form onSubmit={handleSubmit}>
a
<input
type="text"
name="a"
value={state["a"] || ""}
onChange={handleChange}
/>
b
<input
type="text"
name="b"
value={state["b"] || ""}
onChange={handleChange}
/>
<button type="submit">Save</button>
</form>
</div>
);
}
You can do like: setState({ ...state, [name]: value }); it should work for object
You can make use of useEffect to do something after the state is updated.
const [state, setState] = useState({});
...
useEffect(() => {
console.log('Do something after state has changed', state);
}, [state]);
PS: This will run in the first render though.
You can take a look this code for your reference. https://codesandbox.io/s/sleepy-saha-q7h72
function App() {
const [state, setState] = React.useState({ firstName: "", lastName: "" });
const handleChange = e => {
setState({ ...state, [e.target.name]: e.target.value });
};
return (
<div className="App">
<input
type="text"
placeholder="first name"
onChange={handleChange}
value={state.firstName}
name="firstName"
/>
<br />
<input
type="text"
placeholder="last name"
onChange={handleChange}
value={state.lastName}
name="lastName"
/>
<hr />
{state.firstName}--{state.lastName}
</div>
);
}

Template doesn't react to the change of variable React

I have a component in which I want to display another component after form submit.
When I'm running function on form submit I'm changing submitted value to true and if I do console.log(submitted) it changes to true but in the template it is still false so Alert component doesn't show up.
I'm trying to learn hooks and maybe the problem with how I'm using them?
My component looks like this
export const SignupForm = () => {
let name:any = handleUserInput('');
let email:any = handleUserInput('');
let password:any = handleUserInput('');
let submitted:any = false;
function registerUser(event: React.FormEvent<HTMLFormElement>): void {
event.preventDefault();
submitted = true;
const registerInfo = Object.assign({}, {
email: email.value,
password: password.value,
name: name.value
});
axios.post('/register', registerInfo)
.then(response => {
errors = response.data.errors
})
.catch(error => console.log(error))
}
function handleUserInput(initialValue: string): object {
const [value, setValue] = useState(initialValue);
function handleChange(event: Event): void {
let element = event.target as HTMLInputElement;
setValue(element.value);
}
return {
value,
onChange: handleChange
}
}
return (
<div>
<div dangerouslySetInnerHTML={{__html: submitted}}></div>
{submitted ? <Alert /> : ''}
<div className="form-holder">
<form action="POST" className="form" onSubmit={(e) => registerUser(e)}>
<label htmlFor="Email">Email</label>
<input type="text" id="email" className="form__input" {...email} required />
<label htmlFor="password">Password</label>
<input type="password" id="password" className="form__input" {...password} required />
<label htmlFor="name">Name</label>
<input type="text" id="name" className="form__input" {...name} required />
<button type="submit" className="form__button">Signup</button>
</form>
</div>
</div>
);
}
submitted local variable is assigned asynchronously. This won't result in component update.
It should be:
...
const [submitted, setSubmitted] = useState(false);
function registerUser(event: React.FormEvent<HTMLFormElement>): void {
event.preventDefault();
setSubmitted(true);
...

Unable to use onClick event ReactJS

I am trying to send data in a form using onClick. Below is my Form
import React from 'react';
const form = props => (
<form>
<input type = "text" name = "name" placeholder="name" />
<input type = "text" name = "lastname" placeholder="last name" />
<input type = "text" name = "id" placeholder="email address" />
<button onClick = {props.clickHandler}>Send</button>
</form>
);
export default form;
Below is my App.js
import React, { Component } from 'react';
import './App.css';
import Form from './Components/Form';
class App extends Component {
clickHandler = async(e) =>{
e.preventDefault();
const name = e.target.value;
console.log(name + 'was typed');
}
render() {
return (
<div className="App">
<h1>I am a React App </h1>
<Form form = {this.Form}/>
</div>
);
}
}
export default App;
I am not sure why the value is not being visible on console. Any help is appreciated.
First of all name your components as starting with a capital letter.
For this kind of situations, you can keep the values in your main component's state, then update them via your callback functions which are being passed to the child component.
class App extends React.Component {
state = {
name: "",
lastName: "",
email: ""
};
clickHandler = e => {
e.preventDefault();
const { name, lastName, email } = this.state;
const data = `Data is: ${name}-${lastName}-${email}`;
alert(data);
};
changeHandler = e => {
e.preventDefault();
const { name, value } = e.target;
this.setState({
[name]: value
});
};
render() {
console.log(this.state);
const { clickHandler, changeHandler } = this;
return (
<div className="App">
<h1>I am a React App </h1>
<Form clickHandler={clickHandler} changeHandler={changeHandler} />
</div>
);
}
}
const Form = props => (
<form>
<input
onChange={props.changeHandler}
type="text"
name="name"
placeholder="name"
/>
<input
onChange={props.changeHandler}
type="text"
name="lastName"
placeholder="last name"
/>
<input
onChange={props.changeHandler}
type="text"
name="email"
placeholder="email address"
/>
<button onClick={props.clickHandler}>Send</button>
</form>
);
ReactDOM.render(<App />, document.getElementById("root"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>
For the inputs, you need an onChange handler, for your button you need an onClick handler as you thought. You can see the changing state in the console. When you hit the button it creates an object using your state values then fires the alert.
You need to pass down the clickHandler as a prop to your Form component
render() {
return (
<div className="App">
<h1>I am a React App </h1>
<Form onSubmit={this.clickHandler} />
</div>
)
}
Your are using React Uncontrolled form inputs so you need to handle the form onSubmit event
import React from "react"
const form = props => (
<form
onSubmit={e => {
e.preventDefault()
this.props.onSubmit(e)
}}
>
<input type="text" name="name" placeholder="name" />
<input type="text" name="lastname" placeholder="last name" />
<input type="text" name="id" placeholder="email address" />
<input type="submit" value="Send" />
</form>
)
export default form
And in the clickHandleryou can now retrieve all values from the submit event like so
clickHandler = async e => {
e.preventDefault()
const name = e.target.elements[0]
console.log(name + "was typed")
}
Edit: Added a way to see form values
import React, { Component } from 'react';
import './App.css';
import Form from './Components/Form';
class App extends Component {
clickHandler = (data) => {
console.log('data::', data );
}
render() {
return (
<div className="App">
<h1>I am a React App </h1>
<Form clickHandler = {this.clickHandler}/>
</div>
);
}
}
export default App;
import React, { PureComponent } from 'react';
export class Form extends PureComponent {
state = {
name: '',
lastname: '',
id: ''
}
onNameChange = (event) => {
this.setState({
name: event.target.value
})
}
onLastNameChange = (event) => {
this.setState({
lastname: event.target.value
})
}
onEmailChange = (event) => {
this.setState({
id: event.target.value
})
}
render() {
return (
<form>
<input type = "text" name = "name" placeholder="name" onChange={this.onNameChange} />
<input type = "text" name = "lastname" placeholder="last name" onChange={this.onLastNameChange} />
<input type = "text" name = "id" placeholder="email address" onChange={this.onEmailChange}/>
<button onClick = {props.clickHandler.bind(null, this.state)}>Send</button>
</form>
);
}
}

Clear and reset form input fields

I have a form containing various input fields and two buttons; one for submitting and one for cancelling.
<form id="create-course-form">
<input type="text" name="course_Name" ref="fieldName">
<input type="text" name="course_org" ref="fieldOrg">
<input type="text" name="course_Number" ref="fieldNum">
<input type="submit" name="saveCourse" value="Create">
<input type="button" name="cancelCourse" value="cancel" onClick={this.cancelCourse}>
</form>
What I want is to empty all inputs when the cancel button is clicked. So far I've managed to do this by using each input's ref prop.
cancelCourse(){
this.refs.fieldName.value="";
this.refs.fieldorg.value="";
this.refs.fieldNum.value="";
}
However, I want to empty the input fields without having to empty each one seperately. I want something similar to this (jQuery): $('#create-course-form input[type=text]').val('');
The answer here depends on whether or not your inputs are controlled or uncontrolled. If you are unsure or need more info on this, check out what the official docs say about controlled components and uncontrolled components. Thanks #Dan-Esparza for providing the links.
Also, please note that using string literals in ref is deprecated. Use the standard callback method instead.
Clearing a form with uncontrolled fields
You can clear the entire form rather than each form field individually.
cancelCourse = () => {
document.getElementById("create-course-form").reset();
}
render() {
return (
<form id="create-course-form">
<input />
<input />
...
<input />
</form>
);
}
If your form didn't have an id attribute you could use a ref as well:
cancelCourse = () => {
this.myFormRef.reset();
}
render() {
return (
<form ref={(el) => this.myFormRef = el;}>
<input />
<input />
...
<input />
</form>
);
}
Clearing a form with controlled fields
If you are using controlled form fields, you may have to explicitly reset each component inside your form, depending on how your values are stored in the state.
If they are declared individually, you need to reset each one explicitly:
cancelCourse = () => {
this.setState({
inputVal_1: "",
inputVal_2: "",
...
inputVal_n: "",
});
}
render() {
return (
<input value={this.state.inputVal_1} onChange={this.handleInput1Change}>
<input value={this.state.inputVal_2} onChange={this.handleInput2Change}>
...
<input value={this.state.inputVal_n} onChange={this.handleInputnChange}>
);
}
Demo below:
class MyApp extends React.Component {
constructor() {
super();
this.state = {
inputVal_1: "",
inputVal_2: "",
inputVal_3: "",
inputVal_4: "",
inputVal_5: "",
inputVal_6: "",
inputVal_7: "",
inputVal_8: "",
inputVal_9: "",
inputVal_10: ""
};
}
handleInput1Change = (e) => {
this.setState({inputVal_1: e.target.value});
}
handleInput2Change = (e) => {
this.setState({inputVal_2: e.target.value});
}
handleInput3Change = (e) => {
this.setState({inputVal_3: e.target.value});
}
handleInput4Change = (e) => {
this.setState({inputVal_4: e.target.value});
}
handleInput5Change = (e) => {
this.setState({inputVal_5: e.target.value});
}
handleInput6Change = (e) => {
this.setState({inputVal_6: e.target.value});
}
handleInput7Change = (e) => {
this.setState({inputVal_7: e.target.value});
}
handleInput8Change = (e) => {
this.setState({inputVal_8: e.target.value});
}
handleInput9Change = (e) => {
this.setState({inputVal_9: e.target.value});
}
handleInput10Change = (e) => {
this.setState({inputVal_10: e.target.value});
}
cancelCourse = () => {
this.setState({
inputVal_1: "",
inputVal_2: "",
inputVal_3: "",
inputVal_4: "",
inputVal_5: "",
inputVal_6: "",
inputVal_7: "",
inputVal_8: "",
inputVal_9: "",
inputVal_10: ""
});
}
render() {
return (
<form>
<input value={this.state.inputVal_1} onChange={this.handleInput1Change} />
<input value={this.state.inputVal_2} onChange={this.handleInput2Change} />
<input value={this.state.inputVal_3} onChange={this.handleInput3Change} />
<input value={this.state.inputVal_4} onChange={this.handleInput4Change} />
<input value={this.state.inputVal_5} onChange={this.handleInput5Change} />
<input value={this.state.inputVal_6} onChange={this.handleInput6Change} />
<input value={this.state.inputVal_7} onChange={this.handleInput7Change} />
<input value={this.state.inputVal_8} onChange={this.handleInput8Change} />
<input value={this.state.inputVal_9} onChange={this.handleInput9Change} />
<input value={this.state.inputVal_10} onChange={this.handleInput10Change} />
<input type="submit" name="saveCourse" value="Create" />
<input type="button" name="cancelCourse" value="cancel" onClick={this.cancelCourse} />
</form>
);
}
}
ReactDOM.render(<MyApp />, document.getElementById("app"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="app"></div>
There is a cleaner way to do this though. Rather than having n state properties and n event handlers, one for each input, with some clever coding we can reduce the code dramatically.
In the constructor we just declare an empty object, which will be used to hold input values. We use only one input handler and pass it the index of the input element we want to change the value of. This means that the value of an individual input is generated the moment we start typing into it.
To reset the form, we only need to set our input object back to being empty again.
The input value is this.state.inputVal[i]. If i doesn't exist (we haven't typed anything yet into that input) we want the value to be an empty string (instead of null).
cancelCourse = () => {
this.setState({inputVal: {}});
}
render() {
return (
<form>
{[...Array(n)].map(
(item, i) => <input value={this.state.inputVal[i] || ""} onChange={this.handleInputChange.bind(this, i)} />
)}
</form>
);
}
Demo below:
class MyApp extends React.Component {
constructor() {
super();
this.state = {
inputVal: {}
};
}
handleInputChange = (idx, {target}) => {
this.setState(({inputVal}) => {
inputVal[idx] = target.value;
return inputVal;
});
}
cancelCourse = () => {
this.setState({inputVal: {}});
}
render() {
return(
<form>
{[...Array(10)].map( //create an array with a length of 10
(item, i) => <input value={this.state.inputVal[i] || ""} onChange={this.handleInputChange.bind(this, i)} /> //bind the index to the input handler
)}
<input type="submit" name="saveCourse" value="Create" />
<input type="button" name="cancelCourse" value="cancel" onClick={this.cancelCourse} />
</form>
);
}
}
ReactDOM.render(<MyApp />, document.getElementById("app"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="app"></div>
Very easy:
handleSubmit(e){
e.preventDefault();
e.target.reset();
}
// If using class component
<form onSubmit={this.handleSubmit.bind(this)}>
...
</form>
// If using function component
<form onSubmit={handleSubmit}>
...
</form>
Using event.target.reset() only works for uncontrolled components, which is not recommended. For controlled components you would do something like this:
import React, { Component } from 'react'
class MyForm extends Component {
initialState = { name: '' }
state = this.initialState
handleFormReset = () => {
this.setState(() => this.initialState)
}
render() {
return (
<form onReset={this.handleFormReset}>
<div>
<label htmlFor="name">Name</label>
<input
type="text"
placeholder="Enter name"
name="name"
value={name}
onChange={this.handleInputOnChange}
/>
</div>
<div>
<input
type="submit"
value="Submit"
/>
<input
type="reset"
value="Reset"
/>
</div>
</form>
)
}
}
ContactAdd.propTypes = {}
export default MyForm
You can also do it by targeting the current input, with anything.target.reset() . This is the most easiest way!
handleSubmit(e){
e.preventDefault();
e.target.reset();
}
<form onSubmit={this.handleSubmit}>
...
</form>
Here's an update to Chris's answer above, using modern React hooks.
Same high level idea; your form can be either a Controlled or Uncontrolled component.
Uncontrolled components:
Uncontrolled components leave state management up to the browser. That means you have to ask the browser to reset the form inputs. To do that, capture the form element as a ref, and then call the submit() method on that element.
export default function Form() {
const ref = React.useRef();
function reset(ev) {
ev.preventDefault();
ref.current.reset();
}
return (
<form ref={ref}>
<label htmlFor="email">Email Address</label>
<input id="email" type="email" name="email" />
<label htmlFor="message">Message</label>
<textarea id="message" name="message" />
<button type="submit">Submit</button>
<button onClick={reset}>Reset</button>
</form>
);
}
Controlled components:
With a controlled component, you manage the state in React. That means you have to create the initial state, and update it every time an input changes. In this world, resetting the form is just a matter of setting the form state back to its initial state.
export default function Form() {
const [state, setState] = React.useState({ email: "", message: "" });
function reset(ev) {
ev.preventDefault();
setState({ email: "", message: "" });
}
return (
<form className="Form">
<label htmlFor="email">Email Address</label>
<input
id="email"
type="email"
name="email"
value={state.email}
onChange={(ev) => {
setState({ ...state, email: ev.target.value });
}}
/>
<label htmlFor="message">Message</label>
<textarea
id="message"
name="message"
value={state.message}
onChange={(ev) => {
setState({ ...state, message: ev.target.value });
}}
/>
<button type="submit">Submit</button>
<button onClick={reset}>Reset</button>
</form>
);
}
Full example at https://codesandbox.io/s/reactformreset-10cjn3
Following code should reset the form in one click.
import React, { Component } from 'react';
class App extends Component {
constructor(props){
super(props);
this.handleSubmit=this.handleSubmit.bind(this);
}
handleSubmit(e){
this.refs.form.reset();
}
render(){
return(
<div>
<form onSubmit={this.handleSubmit} ref="form">
<input type="text" placeholder="First Name!" ref='firstName'/><br/<br/>
<input type="text" placeholder="Last Name!" ref='lastName'/><br/><br/>
<button type="submit" >submit</button>
</form>
</div>
}
}
To clear your form, admitted that your form's elements values are saved in your state, you can map through your state like that :
// clear all your form
Object.keys(this.state).map((key, index) => {
this.setState({[key] : ""});
});
If your form is among other fields, you can simply insert them in a particular field of the state like that:
state={
form: {
name:"",
email:""}
}
// handle set in nested objects
handleChange = (e) =>{
e.preventDefault();
const newState = Object.assign({}, this.state);
newState.form[e.target.name] = e.target.value;
this.setState(newState);
}
// submit and clear state in nested object
onSubmit = (e) =>{
e.preventDefault();
var form = Object.assign({}, this.state.form);
Object.keys(form).map((key, index) => {
form[key] = "" ;
});
this.setState({form})
}
This one works best to reset the form.
import React, { Component } from 'react'
class MyComponent extends Component {
constructor(props){
super(props)
this.state = {
inputVal: props.inputValue
}
// preserve the initial state in a new object
this.baseState = this.state ///>>>>>>>>> note this one.
}
resetForm = () => {
this.setState(this.baseState) ///>>>>>>>>> note this one.
}
submitForm = () => {
// submit the form logic
}
updateInput = val => this.setState({ inputVal: val })
render() {
return (
<form>
<input
onChange={this.updateInput}
type="text
value={this.state.inputVal} />
<button
onClick={this.resetForm}
type="button">Cancel</button>
<button
onClick={this.submitForm}
type="submit">Submit</button>
</form>
)
}
}
When the form is submitted, the 'event' will be passed as an argument to the handleSubmit method, and if that you can access the <form> element by typing event.target. then you just need to reset the form using .reset() form method.
https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/reset
handleSubmit = (event)=>{
event.preventDefault()
....
event.target.reset()
}
render() {
return (
<>
<form onSubmit={this.handleSubmit}>
<label htmlFor='movieTitle'>Title</label>
<input name='movieTitle' id='movieTitle' type='text' />
<input type='submit' value='Find Movie Info' />
</form>
</>
)
}
I don't know if this is still relevant. But when I had similar issue this is how I resolved it.
Where you need to clear an uncontrolled form you simply do this after submission.
this.<ref-name-goes-here>.setState({value: ''});
Hope this helps.
import React, { Component } from 'react'
export default class Form extends Component {
constructor(props) {
super(props)
this.formRef = React.createRef()
this.state = {
email: '',
loading: false,
eror: null
}
}
reset = () => {
this.formRef.current.reset()
}
render() {
return (
<div>
<form>
<input type="email" name="" id=""/>
<button type="submit">Submit</button>
<button onClick={()=>this.reset()}>Reset</button>
</form>
</div>
)
}
}
/*
See newState and use of it in eventSubmit() for resetting all the state.
I have tested it is working for me. Please let me know for mistakes
*/
import React from 'react';
const newState = {
fullname: '',
email: ''
}
class Form extends React.Component {
constructor(props) {
super(props);
this.state = {
fullname: ' ',
email: ' '
}
this.eventChange = this
.eventChange
.bind(this);
this.eventSubmit = this
.eventSubmit
.bind(this);
}
eventChange(event) {
const target = event.target;
const value = target.type === 'checkbox'
? target.type
: target.value;
const name = target.name;
this.setState({[name]: value})
}
eventSubmit(event) {
alert(JSON.stringify(this.state))
event.preventDefault();
this.setState({...newState});
}
render() {
return (
<div className="container">
<form className="row mt-5" onSubmit={this.eventSubmit}>
<label className="col-md-12">
Full Name
<input
type="text"
name="fullname"
id="fullname"
value={this.state.fullname}
onChange={this.eventChange}/>
</label>
<label className="col-md-12">
email
<input
type="text"
name="email"
id="email"
value={this.state.value}
onChange={this.eventChange}/>
</label>
<input type="submit" value="Submit"/>
</form>
</div>
)
}
}
export default Form;
the easiest way is doing it regularly with just HTML and using the button type "reset" there is no need to mess with anything in react at all, no state, no nothing.
import React, {useState} from 'react'
function HowReactWorks() {
return (
<div>
<form>
<div>
<label for="name">Name</label>
<input type="text" id="name" placeholder="name" />
</div>
<div>
<label for="password">Password</label>
<input type="password" id="password" placeholder="password" />
</div>
<button type="reset">Reset</button>
<button>Submit</button>
</form>
</div>
)
}
export default HowReactWorks
edited for the people that don't know how to include HTML in react
You can use this method as well
const resetData = (e) => {
e.preventDefault();
settitle("");
setdate("");
};
<input type="text" onChange={(e) => settitle(e.target.value)} value={title} />
<input type="date" onChange={(e) => setdate(e.target.value)} value={date} />
<button onClick={resetData}>Reset Data</button>
This is the solution that worked for me, in the case of parent component triggering reset of child controlled input components:
const ParentComponent = () => {
const [reset, setReset] = useState()
const submitHandler = (e) => {
e.preventDefault()
//do your stuff
setReset(Date.now()) // pass some value to trigger update
}
return (
<form onSubmit={submitHandler}>
<ChildInputComponent reset={reset} />
<ChildInputComponent reset={reset} />
</form>
)
}
const ChildInputComponent = ({reset}) => {
const [value, setValue] = useState()
useEffect(() => {
setValue('')
}, [reset])
return <input value={value} onChange={(e) => setValue(e.target.value)} />
}
Assuming you declared
const [inputs, setInputs] = useState([]);
As multiple parameters. You can actually reset the items using this syntax:
setInputs([]);
Just in case, this how you define handleChange.
You can use this form or any ways you want.
const handleChange = (event) => {
const name = event.target.name;
const email = event.target.email;
const message = event.target.message;
const value = event.target.value;
setInputs(values => ({...values, [name]: value, [email]: value, [message]: value}))
}
You can use this form as an example.
<form onSubmit={handleSubmit}>
<div className="fields">
<div className="field half">
<label for="name">Name</label>
<input value={inputs.name || ''} type="text" name="name" id="nameId" onChange={handleChange} maxLength="30" />
</div>
<div className="field half">
<label for="email">Email</label>
<input value={inputs.email || ''} type="text" name="email" id="emailId" onChange={handleChange} maxLength="40"/>
</div>
<div className="field">
<label for="message">Message</label>
<textarea value={inputs.message || ''} name="message" id="messageId" rows="6" onChange={handleChange} maxLength="400" />
</div>
</div>
<ul className="actions">
<li><input type="submit" value="Send Message" className="primary" /></li>
<li><input onClick={resetDetails} type="reset" value="Clear" /></li>
</ul>
</form>
This is just one of many ways to declare forms. Good luck!
const onReset = () => {
form.resetFields();
};
state={
name:"",
email:""
}
handalSubmit = () => {
after api call
let resetFrom = {}
fetch('url')
.then(function(response) {
if(response.success){
resetFrom{
name:"",
email:""
}
}
})
this.setState({...resetFrom})
}
Why not use HTML-controlled items such as <input type="reset">

Resources