How to Enter Text By User Input in React JS - javascript

I am trying to get the user to input data for my TODO App instead of picking up data from a predefined array.
Below is my Parent component
import React from "react"
import TodoItem from "./TodoItem"
import todosData from "./todosData"
class App extends React.Component {
constructor() {
super()
this.state = {
name: "",
todos: todosData
}
this.handleChange = this.handleChange.bind(this)
this.nameEnter = this.nameEnter.bind(this)
}
handleChange(id) {
this.setState(prevState => {
const updatedTodos = prevState.todos.map(item => {
if (item.id === id){
return {
...item,
completed: !item.completed
}
}
return item
})
return {
todos: updatedTodos
}
})
}
nameEnter(){
var name = this.name
console.log(name)
}
render() {
const todoItems = this.state.todos.map(item => <TodoItem key={item.id} item={item}
handleChange = {this.handleChange} nameEnter= {this.nameEnter}/>)
return (
<div className="todo-list">
{todoItems}
</div>
)
}
}
export default App
This one is the child component where I have added input fields
import React from "react"
function TodoItem(props) {
return (
<div className="todo-item">
<input
type = "checkbox"
checked = {props.item.completed}
onChange = { () => props.handleChange(props.item.id) }
/>
<input type = "text" name= "name" />
<p>{props.item.text}</p>
</div>
)
}
export default TodoItem
This is how my page looks. Instead of predefined text example:"GROCERRY SHOPPING", I want the user to enter text and it should be in place of that.

Ok so here it is
<input onChange={(e)=>handleChange(e)}/>
//react hooks
const [values,setValues] = useState({inputValue: 'predefined'});
handleChange = (e)=>{
setValues({...values,[e.target.name]: e.target.value})
}
//classes
handleChange = (e)=>{
this.setState({[e.target.name]:e.target.value});
}
this generic and can apply to a number of inputs, not just one

import React from "react"
class Form extends React.Component {
constructor() {
super()
this.state = {
name: ""
}
}
onChange = (e) => {
this.setState({
[e.target.name]: e.target.value
})
}
render() {
const {name} = this.state
return (
<input type="text" name="name" value={name} onChange={this.onChange}/>
)
}
}
export default Form

changeInputVal (ev, index) {
ev.persist();
const newArr = this.state.inputArrVal;
newArr[index]=ev.target.value;
this.setState({inputArrVal:newArr, currentPage:1});
}
you need to do something like that in TodoItem --
where --
1- inputArrVal:{} is object And
2- "this.changeInputVal(event, props.item.id)}/>"

Related

ReactJS how to access content output from a component?

I'm currently working on a project that uses QuillJS for a rich text editor. I need to post the rich text content to my backend but I'm not sure how to access the QuillJS output.
In RichTextEditor.js
import React, { Component } from "react";
import ReactQuill from "react-quill";
import "react-quill/dist/quill.snow.css";
class RichTextEditor extends Component {
constructor(props) {
super(props);
// this.formats = formats;
this.state = { text: "" }; // You can also pass a Quill Delta here
this.handleChange = this.handleChange.bind(this);
}
handleChange(value) {
this.setState({ text: value });
const text = this.state;
console.log(text);
}
render() {
return (
<ReactQuill
value={this.state.text}
onChange={this.handleChange}
formats={this.formats}
modules={this.modules}
/>
);
}
}
export default RichTextEditor;
The console.log(text) basically just outputs the content of the rich text editor. Something like this "<p><em>aasdasdasd</em><strong><em>asdasdasdasd</em></strong></p>"
In Post.js
import React, { Component } from "react";
import RichTextEditor from "./RichTextEditor.js";
import "../../css/Post.css";
class Post extends Component {
constructor(props) {
super(props);
this.state = {
question: "",
};
}
onChange = (e) => {
this.setState({ [e.target.name]: e.target.value });
console.log(this.state);
};
handleSubmit = (e) => {
e.preventDefault();
const { question } = this.state;
console.log("Question");
console.log(question);
render() {
const { question } = this.state;
return (
<div className="post">
<div className="post__container">
<form onSubmit={this.handleSubmit}>
<div className="post__richTextEditor">
<RichTextEditor value={question} onChange={this.onChange} name="question" />
</div>
</form>
</div>
</div>
);
}
}
export default Post;
I'm trying to update the state of the question but it doesn't seem to be updating. console.log(question) only outputs a single string.
How can I access the same string output from RichTextEditor.js?
Your RichTextEditor component should not handle change, it should only receive props from higher component:
class RichTextEditor extends Component {
constructor(props) {
super(props);
}
render() {
return (
<ReactQuill
value={this.props.value}
onChange={this.props.onChange}
formats={this.formats}
modules={this.modules}
/>
);
}
}
export default RichTextEditor;
Then your Post component pass value and onChange props to RichTextEditor:
class Post extends Component {
constructor(props) {
super(props);
this.state = {
question: "",
};
this.onChange = this.onChange.bind(this);
}
onChange = (e) => {
this.setState({ [e.target.name]: e.target.value });
console.log(this.state);
};
handleSubmit = (e) => {
e.preventDefault();
const { question } = this.state;
console.log("Question");
console.log(question);
render() {
const { question } = this.state;
return (
<div className="post">
<div className="post__container">
<form onSubmit={this.handleSubmit}>
<div className="post__richTextEditor">
<RichTextEditor value={question} onChange={this.onChange} name="question" />
</div>
</form>
</div>
</div>
);
}
}
in RichTextEditor.js
handleChange(value) {
this.setState({ text: value });
const text = this.state;
console.log(text);
props.onChange(text); // passing the inner State to parent as argument to onChange handler
}
Now in Post.js
onChange = (newStateString) => {
//this.setState({ [e.target.name]: e.target.value });
console.log(newStateString); // you should get the string here
};

todo list app - onChange on ReactJS doesn't work?

I am new to ReactJS and I'm doing a simple to-list with it. I am working on the part of check box. What I want to do is to uncheck the box whenever i click it or vice versa. But nothing has been changed, so I am wondering if anything wrong....
Below is the App.js and index.js file
import React from 'react';
import Todolist from './Todolist';
import todoData from './todoData';
class App extends React.Component {
constructor(){
super()
this.state = {
todos: todoData //grab the raw data
}
this.handleChange = this.handleChange.bind(this)
}
handleChange (id){
console.log(id)
this.setState (prevState => {
const updatedtodos = prevState.todos.map(todo => {
if(todo.id == id) {
todo.completed = !todo.completed
}
return todo
})
return {
todos: updatedtodos
}
})
}
render() {
const TodoItem = this.state.todos.map(item => <Todolist key={item.id} item={item} handleChange={this.handleChange}/>)
return(
<div>
{TodoItem}
</div>
);
}
}
export default App;
import React from 'react';
function Todolist (props){
return(
<div className="wholelist">
<input
type="checkbox"
checked={props.item.completed}
onChange={()=> props.handleChange(props.item.id)}
/>
<label className="items">{props.item.name}</label>
</div>
);
}
export default Todolist;
Change handleChange:
handleChange(id) {
console.log(id);
const updatedtodos = this.state.todos.map(todo => {
if (todo.id === id) {
todo.completed = !todo.completed;
}
return todo;
});
this.setState({
todos: updatedtodos
});
}
you need to change two things.
firstly:
handleChange = (id) => { // I've changed this to an arrow function so it can access parent scope and you can use "this" keyword
console.log(id)
this.setState (prevState => {
const todos = this.state.todos.map(todo => {
if(todo.id === id) {
todo.completed = !todo.completed
}
return todo
})
this.setState({ todos }) // you can use object shorthand here to change todos in state to use the todos set above
})
}
secondly:
change this: handleChange={this.handleChange}
to: handleChange={() => this.handleChange(item.id)}
you said that handleChange(id) need to take an id, so we need to pass one in when we call it
let me know if that works!

Why the state is not updating in App.js after setting up this.setState?

Here is my simple to-do app program where I have made only one component which takes in the input form user and passes that input value to App.js to update items in App.js state.
todo-form.component.js
import React from 'react';
class SignInForm extends React.Component {
constructor(){
super();
this.state ={
temp: null
};
}
handleChange = (e) => {
e.preventDefault();
this.setState({
temp: e.target.value
},
console.log(this.state)
);
// this.props.addInput(e.target.value);
}
handleSubmit= (e) => {
e.preventDefault();
console.log(this.state.temp);
this.props.addInput(this.state.temp);
}
render(){
return(
<div className="container-form">
<form onSubmit={this.handleSubmit}>
<input
name="description"
type="text"
placeholder="add description"
onChange={this.handleChange}
value={this.state.input}
/>
<button type="submit">ADD</button>
</form>
</div>
);
}
}
export default SignInForm;
App.js
import React from 'react';
import './App.css';
import SignInForm from './components/todo-form/todo-form.component'
import ItemList from './components/todo-list/todo-list.component';
class App extends React.Component {
constructor(){
super();
this.state = {
input: []
};
}
addInput = (item) => {
let newInput=[...this.state.input,item];
console.log(newInput);
this.setState = ({
input: newInput
},
console.log(this.state)
);
}
render(){
return (
<div className="App">
<h1>TO-DO LIST</h1>
<SignInForm addInput={this.addInput} />
</div>
);
}
}
export default App;
On taking input the state inside todo-form.component.js is getting updated with the typed input value but on passing state.temp in handleChange function, the state inside App.js is not updating when addInput function is called.
Please help me on this issue and how my state is not getting updated in App.js??
Your setState is the problem. Have a look at my code.
App.js
class App extends React.Component {
state = {
input: [],
};
addInput = (item) => {
let newInput = [...this.state.input, item];
//setState should be this way
this.setState({
input: newInput,
});
};
render() {
return (
<div className="App">
<h1>TO-DO LIST</h1>
{this.state.input.map((el) => (
<li> {el}</li>
))}
<SignInForm addInput={this.addInput} />
</div>
);
}
}
export default App;
Login file.
class SignInForm extends React.Component {
// constructor(props) {
// super(props);
state = {
temp: null,
};
// }
handleChange = (e) => {
e.preventDefault();
this.setState({
temp: e.target.value,
});
// this.props.addInput(e.target.value);
};
handleSubmit = (e) => {
e.preventDefault();
console.log(this.state.temp);
this.props.addInput(this.state.temp);
};
render() {
return (
<div className="container-form">
<form onSubmit={this.handleSubmit}>
<input
name="description"
type="text"
placeholder="add description"
onChange={this.handleChange}
value={this.state.input}
/>
<button type="submit">ADD</button>
</form>
</div>
);
}
}
export default SignInForm;

How to pass a value to other component in React

I have a project that can add, edit or delete movies from a list. I'm having trouble with the edit part of the component, next to every movie I added a text input to edit that movie if wanted, but I don't know how to pass that value to the other component in order to change the old value for the new one. Here is what I got for now:
Movie component:
import React, {Component} from 'react';
class Movie extends Component{
constructor(props){
super(props);
this.state= {
inputValue: ''
};
}
updateInputValue(evt) {
this.setState({
inputValue: evt.target.value
});
}
render(){
return(
<div>
{this.props.text}
<button onClick={this.props.deleteMethod}>X</button>
<input value={this.props.newMovieName}
onChange={evt => this.updateInputValue(evt)}
/>
<button onClick={this.props.editMethod().bind(this.inputValue)}>edit</button>
</div>
);
}
}
export default Movie;
Add component:
import React,{Component} from 'react';
import Movie from './Movie.jsx';
class AddComponent extends Component {
constructor(props){
super(props);
this.state = {
movieText: '',
movies: [],
};
}
updateMovieText(movieText){
this.setState({movieText: movieText.target.value})
}
addMovie(){
if(this.state.movieText === ''){return}
let moviesArr = this.state.movies;
moviesArr.push(this.state.movieText);
this.setState({movieText: ''})
this.textInput.focus();
}
handleKeyPress = (event) => {//enables to add when pressing enter on keyboard
if(event.key === 'Enter'){
let moviesArr = this.state.movies;
moviesArr.push(this.state.movieText);
this.setState({movieText: ''})
}
}
deleteMovie(index) {
let movieArr = this.state.movies;
movieArr.splice(index,1);//remove the movie from array
this.setState({movies: movieArr})
}
editMovie(index,value){
let moviesArr = this.state.movies;
moviesArr[index] = value;
this.setState({movies:movieArr});
}
render(){
let movie = this.state.movies.map((val,key)=> {//prints on screen list of movies see line55
return (<Movie
key={key}
text={val}
deleteMethod={() => this.deleteMovie(key)}
editMethod={() => this.editMovie(key,this.inputValue)}
/>
);
});
return (
<div>
<input type="text"
ref={((input)=>{this.textInput = input;})}
className="textInput"
value={this.state.movieText}
onChange={movieText => this.updateMovieText(movieText)}
onKeyPress={this.handleKeyPress.bind(this)}
/>
<button onClick={this.addMovie.bind(this)}>Add</button>
{movie}
</div>
);
}
}
export default AddComponent;
I think I should use bind, but for now it isn't working
You need to bind the key in AddComponent so you can identify the movie being edited e.g.
let movie = this.state.movies.map((val,key)=> {
return (<Movie
key={key}
text={val}
deleteMethod={() => this.deleteMovie(key)}
editMethod={this.editMovie.bind(this, key)}
/>
);
Then in the Movie component you need to pass the latest input value on click, e.g.
<button onClick={() => this.props.editMethod(this.state.inputValue)}>edit</button>

Converting a stateful component to stateless

i'm pretty new to react and redux and i'm having an issue here. It's mandatory to use only stateless components with containers whenever state handing is required. These two components are:
import React from 'react';
import DatePicker from '../DatePicker';
class DayInput extends React.Component { // eslint-disable-line react/prefer-stateless-function
constructor(props) {
super(props);
this.state = {
dateValue: new Date(),
activeDateWidget: false,
};
}
changeDate(date) {
this.setState({
dateValue: date,
});
}
changeActiveDateWidget(e) {
e.stopPropagation();
this.setState({
activeDateWidget: !this.state.activeDateWidget,
});
}
render() {
const { input, meta } = this.props;
const { dateValue, activeDateWidget } = this.state;
return (
<div>
<input
{...input}
className="form-control"
type="text"
value={dateValue}
onClick={this.changeActiveDateWidget}
// onBlur={this.changeActiveDateWidget}
/>
{activeDateWidget ? (
<div>
<DatePicker
changeActiveDateWidget={this.changeActiveDateWidget}
changeDate={this.changeDate}
dateValue={dateValue}
/>
</div>
) : (
<div />
)}
</div>
);
}
}
export default DayInput;
import React from 'react';
import 'react-day-picker/lib/style.css';
import DayPicker, { DateUtils } from 'react-day-picker';
class DatePicker extends React.Component { // eslint-disable-line react/prefer-stateless-function
constructor(props) {
super(props);
this.state = {
selectedDay: new Date(),
};
}
componentDidMount() {
if (this.input) {
this.input.focus();
}
}
handleDayClick(e, day, { disabled }) {
e.stopPropagation();
if (disabled) {
return;
}
this.setState({ selectedDay: day }, () => {
this.props.changeDate(day);
this.props.changeActiveDateWidget();
});
}
focusThisComponent(e) {
if (e) {
this.input = e;
}
}
render() {
const { changeActiveDateWidget } = this.props;
const { selectedDay } = this.state;
return (
<div
ref={this.focusThisComponent}
tabIndex="1"
>
<DayPicker
id="THISTHING"
initialMonth={selectedDay}
selectedDays={day => DateUtils.isSameDay(selectedDay, day)}
onDayClick={this.handleDayClick}
/>
</div>
);
}
}
export default DatePicker;
As you can see the first component is wrapped inside the second component. I tried to convert the first component myself like this:
const DayInput = props => {
<input
{...props.input}
type="text"
value= {new Date()}
onClick={()=>??}
/>
}
but as you can see i dont know how to handle the onclick event. Can someone help me to achieve this?
To turn your component in a stateless component, you must pass everything as properties of the component.
This will be your DayInput splitted into 2 components :
const DayInputShow = props => {
return (<input
{...props.input}
type="text"
value= {props.value}
onClick={(event)=>props.onClick()}
/>);
};
const DayInputEdit = props => {
return (<DatePicker
changeActiveDateWidget={props.changeActiveDateWidget}
changeDate={props.onChange}
dateValue={props.value}
/>);
};
DayInputShow.propTypes = {
value: PropTypes.date,
onClick: PropTypes.func,
}
DayInputEdit.propTypes = {
value: PropTypes.date,
onChange: PropTypes.func,
}
And this will be the root component (uncomplete and still statefull) :
class DatePicker extends React.Component { // eslint-disable-line react/prefer-stateless-function
constructor(props) {
super(props);
this.state = {
selectedDay: new Date(),
};
}
componentDidMount() {
if (this.input) {
this.input.focus();
}
}
handleDayClick(e, day, { disabled }) {
e.stopPropagation();
if (disabled) {
return;
}
this.setState({ selectedDay: day }, () => {
this.props.changeDate(day);
this.props.changeActiveDateWidget();
});
}
focusThisComponent(e) {
if (e) {
this.input = e;
}
}
render() {
const { changeActiveDateWidget } = this.props;
const { selectedDay } = this.state;
let dayPicker;
if (this.input) {
dayPicker = <DayPickerEdit
value={this.state.selectedDay}
onChange={(value) => {this.setState({selectedDay: value})}}
selectedDays={day => DateUtils.isSameDay(selectedDay, day)}
onDayClick={this.handleDayClick}
/>
} else {
dayPicker = <DayPickerShow
value={this.state.selectedDay}
ref={(input) => { this.inputRef = input; }} />
onClick={() => {this.focusThisComponent(this.inputRef )}}
/>
}
return (
<div
ref={this.focusThisComponent}
tabIndex="1"
>
{dayPicker }
</div>
);
}
}
export default DatePicker;

Categories