I'am new using reactjs and looks like I am following the tutorial with old version of react. So, I have some roles with their permissions, the problem is when I want to make changes of the role permissions I need to preview them with previous checked permission. As you can see the image below I have the permissions data, but when I try to put them into checkbox using default checked there is nothing happen.
here is my code
RoleEdit.tsx
import axios from "axios";
import { SyntheticEvent, useEffect, useState } from "react";
import { Navigate, useParams } from "react-router-dom";
import Wrapper from "../../components/Wrapper";
import { Permission } from "../../models/permissions";
const RoleEdit = (props:any) => {
const [permissions, setPermissions] = useState([]);
const [selected, setSelected] = useState([] as number[]);
const [name, setName] = useState('');
const [redirect, setRedirect] = useState(false);
const {id} = useParams();
useEffect( () => {
(
async () => {
const response = await axios.get('permissions');
setPermissions(response.data);
const {data} = await axios.get(`roles/${id}`);
setName(data.name);
setSelected(data.permissions.map((p : Permission) => p.id));
}
)();
}, [id]);
const check = (id: number) => {
if(selected.some(s => s === id)){
setSelected(selected.filter(s => s !== id));
return;
}
setSelected([...selected, id]);
}
const submit = async (e: SyntheticEvent) => {
e.preventDefault();
await axios.post('roles', {
name,
permissions: selected
});
setRedirect(true);
}
if(redirect){
return <Navigate to="/roles"/>
}
return(
<Wrapper>
<form onSubmit={submit}>
<div className="mb-3 mt-3 row">
<label className="col-sm-2 col-form-label">Role Name</label>
<div className="col-sm-10">
<input className="form-control" defaultValue={name} onChange={e => setName(e.target.value)}/>
</div>
</div>
<div className="mb-3 row">
<label className="col-sm-2 col-form-label">Permissions</label>
<div className="col-sm-10">
{permissions.map((p: Permission) => {
return(
<div className="form-check form-check-inline col-3" key={p.id}>
<input className="form-check-input" type={"checkbox"}
value={p.id}
defaultChecked={selected.some( s => s === p.id)}
onChange={()=> check(p.id)}/>
<label className="form-check-label">{p.name}</label>
</div>
)
})}
</div>
</div>
<button className="w-100 btn btn-lg btn-primary" type="submit">Save</button>
</form>
</Wrapper>
);
};
export default RoleEdit;
please help me solve the problem so I can continue the tutorial. Thankyou
Related
I'm new to react, and looks like I'm following the tutorial with an old version of react. So, I have some users with their role, and the problem is when I want to make changes to the user role I want it to select the previous user role for preview (not the default value, in this case "admin").
userEdit.tsx
import axios from "axios";
import React, { SyntheticEvent, useEffect, useState } from "react";
import { Navigate, useParams } from "react-router-dom";
import Wrapper from "../../components/Wrapper";
import { Role } from "../../models/role";
const UserEdit = (props: any) => {
const [first_name, setFirstName] = useState('');
const [last_name, setLastName] = useState('');
const [email, setEmail] = useState('');
const [role_id, setRoleId] = useState('');
const [roles, setRoles] = useState([]);
const [redirect, setRedirect] = useState(false);
const {id} = useParams();
useEffect(() => {
(
async () => {
const response = await axios.get('roles');
setRoles(response.data);
const {data} = await axios.get(`users/${id}`);
setFirstName(data.first_name);
setLastName(data.last_name);
setEmail(data.email);
setRoleId(data.role_id);
}
)()
}, [id]);
const submit = async (e: SyntheticEvent) => {
e.preventDefault();
await axios.put(`users/${id}`, {
first_name,
last_name,
email,
role_id
});
setRedirect(true)
}
if(redirect) {
return <Navigate to="/users"/>
}
return (
<Wrapper>
<form onSubmit={submit}>
<h1 className="h3 mb-3 fw-normal">Edit user</h1>
<div className="form-floating">
<input className="form-control" placeholder="First Name" defaultValue={first_name} onChange={e => setFirstName(e.target.value)} required/>
<label htmlFor="floatingInput">First Name</label>
</div>
<div className="form-floating">
<input className="form-control" placeholder="Last Name" defaultValue={last_name} onChange={e => setLastName(e.target.value)} required/>
<label htmlFor="floatingInput">Last Name</label>
</div>
<div className="form-floating">
<input type="email" className="form-control" placeholder="Email Address" defaultValue={email} onChange={e => setEmail(e.target.value)} required/>
<label htmlFor="floatingInput">Email Address</label>
</div>
<div className="form-floating">
<select className="form-control" value={role_id} onChange={e => setRoleId(e.target.value)}>
{roles.map((r: Role) => {
return (
<option key={r.id} value={r.id}>{r.name}</option>
)
})}
</select>
<label>Role</label>
</div>
<button className="w-100 btn btn-lg btn-primary" type="submit">Save</button>
</form>
</Wrapper>
);
};
export default UserEdit;
As you can see I'm using "value={role_id}" to get the previous user role, but it seems to not be working. Please help me so I can continue the tutorial.
try setting defaultValue = {role_id} instead of value
I'm new to React, and I'm trying to render html with a function in React.
This is my code:
import React, { Component, useRef, useState, useEffect } from 'react';
import { render } from 'react-dom';
import Searc from './search'
const HandleSearch = () => {
const [name, searchName] = useState("")
const [comments, getComments] = useState([])
const nameForm = useRef(null)
const onSubmitSearch = async(e) => {
e.preventDefault();
try {
// do something
} catch (error) {
console.log(error.message);
}
}
const displayComment = async() => {
try {
const form = nameForm.current
console.log(form['name'].value)
const name = form['name'].value
const response = await fetch(`http://localhost:5000/folder/${name.toLowerCase()}`)
const jsonData = await response.json()
getComments(jsonData)
} catch (error) {
console.log(error.message)
}
}
useEffect(() => {
displayComment()
}, [])
return(
<div className="container">
<div className="form-group">
<h1 className="text-center mt-5">SEARCH MY LANDLORD</h1>
<form ref={nameForm} className="mt-5" onSubmit={onSubmitSearch}>
<Search name={'name'}/>
<div className="d-flex justify-content-center">
<button type="submit" className="d-flex btn btn-primary" onClick={displayComment}>Search</button>
</div>
</form>
<div>
<div>
{/*<tr>
<td>Mary</td>
</tr>*/}
{comments.map(comment => (
<tr>
<td>{comment.problem}</td>
</tr>
))}
</div>
</div>
</div>
</div>
)
}
export default HandleSearch;
The issue I have is that the full list of comments appears before I trigger the displayComments function (once it's trigger it works).
<div>
{/*<tr>
<td>Mary</td>
</tr>*/}
{comments.map(comment => (
<tr>
<td>{comment.problem}</td>
</tr>
))}
</div>
Is it possible to render the above html in the displayComments function so nothing appears before I actually specified which data to display?
You need to remove the useEffect if you want the state to only be set on the button click, because as of right now the state is being set with the useEffect() which is loading when your component is first rendered.
I am trying to add the bottom shadow to the search bar on scroll in react js. it is working well until I go on the second page of my app.
When I am trying to go on the second page, it showing
Uncaught TypeError: Cannot read property 'classList' of null
Not working code :
import React, { useEffect } from 'react';
import { AiOutlineSearch } from "react-icons/ai";
const SearchBar = ({ totalPrograms, programs, setPrograms }) => {
const handleScroll = () => {
if(window.scrollY) {
document.getElementById('sb-header').classList.add('h-shadow');
}
else {
document.getElementById('sb-header').classList.remove('h-shadow');
}
}
useEffect(() => {
window.addEventListener('scroll', handleScroll);
return () => {window.removeEventListener('scroll', handleScroll)};
},[]);
const handleSubmit = (event) => {
event.preventDefault();
const searchProgramName = document.getElementById('search').value;
if(searchProgramName) {
setPrograms(
programs.filter(program =>
program.name.toLowerCase().includes(searchProgramName)
)
);
}
else {
handleClick();
}
}
const handleClick = () => {
const allPhase = document.getElementsByName('phase');
const checkedPhaseValue = [];
allPhase.forEach(phase => {
if(phase.checked) {
checkedPhaseValue.push(phase.value);
}
});
setPrograms(checkedPhaseValue.length ?
totalPrograms.filter(
program => checkedPhaseValue.includes(program.phase.toLowerCase())
)
: totalPrograms
);
}
return (
<header id='sb-header' className="container header-sb">
<form className="container container-center" onSubmit={handleSubmit}>
<div className="type-search">
<AiOutlineSearch className="icon"/>
<input id="search" type="search" placeholder="search by program name"/>
</div>
<div className="checkbox-container">
<div className="d-inline">
<input type="checkbox" onClick={handleClick} name="phase" id="open_application" value="application_open"/>
<label htmlFor="open_application">Open Application</label>
</div>
<div className="d-inline">
<input type="checkbox" onClick={handleClick} name="phase" id="application_in_review" value="application_review"/>
<label htmlFor="application_in_review">Application in Review</label>
</div>
<div className="d-inline">
<input type="checkbox" onClick={handleClick} name="phase" id="in_progress" value="in_progress"/>
<label htmlFor="in_progress">in Progress</label>
</div>
<div className="d-inline">
<input type="checkbox" onClick={handleClick} name="phase" id="completed" value="completed"/>
<label htmlFor="completed">Completed</label>
</div>
</div>
</form>
</header>
)
}
export default SearchBar;
On the second page, I am going by clicking on the Details button. Code for that :
import React from 'react';
import { Link } from 'react-router-dom';
import { FaAngleDoubleRight } from 'react-icons/fa';
import * as ROUTES from '../Constants/routes';
const ProgramCards = ({ program }) => {
return (
<div className="card">
<div className="card-header">
<h1 className="p-name">{program.name}</h1>
</div>
<div className="card-body">
<h3 className="p-category">{program.category}</h3>
<small className="p-phase">{(program.phase).replace('_', ' ')}</small>
<p className="p-description">{program.shortDescription}</p>
</div>
<div>
<div className="date-duration">
<small className="p-date">Start Date: {program.startDate}</small>
<small className="p-duration">Duration: {program.duration}</small>
</div>
<Link to={ROUTES.PROGRAM_DETAILS}>
<button className="card-button">
Details <FaAngleDoubleRight className="icon angled-icon" />
</button>
</Link>
</div>
</div>
)
}
export default ProgramCards;
My question is, why it is not working?
After this, I tried a different approach. And it is working well.
Working code :
import React, { useEffect, useState } from 'react';
import { AiOutlineSearch } from "react-icons/ai";
const SearchBar = ({ totalPrograms, programs, setPrograms }) => {
const [ scrolled, setScrolled ] = useState(false);
const handleScroll = () => {
if(window.scrollY > 10) {
setScrolled(true);
}
else {
setScrolled(false);
}
}
useEffect(() => {
window.addEventListener('scroll', handleScroll);
return () => {window.removeEventListener('scroll', handleScroll)};
},[]);
const handleSubmit = (event) => {
event.preventDefault();
const searchProgramName = document.getElementById('search').value;
if(searchProgramName) {
setPrograms(
programs.filter(program =>
program.name.toLowerCase().includes(searchProgramName)
)
);
}
else {
handleClick();
}
}
const handleClick = () => {
const allPhase = document.getElementsByName('phase');
const checkedPhaseValue = [];
allPhase.forEach(phase => {
if(phase.checked) {
checkedPhaseValue.push(phase.value);
}
});
setPrograms(checkedPhaseValue.length ?
totalPrograms.filter(
program => checkedPhaseValue.includes(program.phase.toLowerCase())
)
: totalPrograms
);
}
return (
<header className={`container header-sb ${scrolled && 'h-shadow'}`}>
<form className="container container-center" onSubmit={handleSubmit}>
<div className="type-search">
<AiOutlineSearch className="icon"/>
<input id="search" type="search" placeholder="search by program name"/>
</div>
<div className="checkbox-container">
<div className="d-inline">
<input type="checkbox" onClick={handleClick} name="phase" id="open_application" value="application_open"/>
<label htmlFor="open_application">Open Application</label>
</div>
<div className="d-inline">
<input type="checkbox" onClick={handleClick} name="phase" id="application_in_review" value="application_review"/>
<label htmlFor="application_in_review">Application in Review</label>
</div>
<div className="d-inline">
<input type="checkbox" onClick={handleClick} name="phase" id="in_progress" value="in_progress"/>
<label htmlFor="in_progress">in Progress</label>
</div>
<div className="d-inline">
<input type="checkbox" onClick={handleClick} name="phase" id="completed" value="completed"/>
<label htmlFor="completed">Completed</label>
</div>
</div>
</form>
</header>
)
}
export default SearchBar;
Your second approach is the better and the react way to do it. It is generally discouraged to query the DOM managed by react yourself. Use ref's if you need the DOM node.
The first example is not working because handleScroll will be recreated every time the component re-renders. Therefore removing the listener will not remove the original listener as the function referenced by handleScroll has changed.
Therefore when your component unmounts the listener will not be removed correctly but react will remove the DOM node. Next time you scroll the handler will still be called but the node you are trying to query isn't there anymore.
You have to create the listener inside of useEffect so that your removeEventListener references the correct function:
useEffect(() => {
const handleScroll = () => setScrolled(window.scrollY > 10);
window.addEventListener('scroll', handleScroll);
return () => window.removeEventListener('scroll', handleScroll);
},[]);
Alternatively you could use useRef to create a stable reference to you listener function.
I'm working with reactjs typescript and cannot seem to prevent this error when trying to display JSON data from the server:
import React, { useRef, useState } from "react";
import useHttp from "../hooks/usehttp";
const HomePage: React.FC = () => {
const [links, setLinks] = useState([]);
const ref = useRef<HTMLInputElement>(null);
const { request } = useHttp();
const pressHandler = async (event: React.KeyboardEvent) => {
if (event.key === "Enter") {
try {
const data = await request(
"http://localhost:5000/api/link/generate-guest",
"POST",
{ from: ref.current!.value },
{}
);
alert(data.message);
console.log(data.link.to); // the link => localhost:5000/jshdadsa
setLinks(data.link.to);
console.log(links); // shows undefined ?????
} catch (error) {
alert(error);
}
}
};
return (
<>
<div className="row">
<div className="col s8 offset-s2" style={{ paddingTop: "2rem" }}>
<div className="input-field">
<input
placeholder="Enter link"
id="link"
type="text"
ref={ref}
onKeyPress={pressHandler}
/>
<label htmlFor="link">Enter link</label>
</div>
<div>
{ {links.map((link: any) => {
return (
<ul className="collection with-header">
<li className="collection-item">{link}</li>
</ul>
);
})} }
</div>
</div>
</div>
</>
);
};
export default HomePage;
Not sure what i am missing.
Use this code in order to update the array of link in your example:
setLinks([...links, data.link.to])
React JS
I'm new to react js
In my api there is username and password. If the user login, have to validate from my json value
handleSubmit(e) {
fetch('https://randomuser.me/api?results=1')
.then((response) => {
return response.json()
.then((json) => {
if (response.ok) {
return Promise.resolve(json)
}
return Promise.reject(json)
})
})
alert(json) not working to check the result.
How can i fetch the username and password in the response?
And how to take this next page if the user was logged in successfully ?
My full Code
App.js
import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import CSSTransitionGroup from 'react-transition-group/CSSTransitionGroup';
const ReactCSSTG = CSSTransitionGroup;
class App extends Component {
constructor(props) {
super(props);
this.state = {
isVisible: true
}
// Bindings
this.handleSubmit = this.handleSubmit.bind(this);
this.handleRemount = this.handleRemount.bind(this);
}
handleSubmit(e) {
alert("dsa");
fetch('https://randomuser.me/api?results=1')
.then((response) => {
return response.json()
.then((json) => {
if (response.ok) {
return Promise.resolve(json)
}
return Promise.reject(json)
})
})
}
handleRemount(e) {
this.setState({
isVisible: true
}, function () {
console.log(this.state.isVisible)
});
e.preventDefault();
}
render() {
// const for React CSS transition declaration
let component = this.state.isVisible ? <Modal onSubmit={this.handleSubmit} key='modal' /> : <ModalBack onClick={this.handleRemount} key='bringitback' />;
return <ReactCSSTG transitionName="animation" transitionAppear={true} transitionAppearTimeout={500} transitionEnterTimeout={500} transitionLeaveTimeout={300}>
{component}
</ReactCSSTG>
}
}
// Modal
class Modal extends React.Component {
render() {
return <div className='Modal'>
<Logo />
<form onSubmit={this.props.onSubmit}>
<Input type='text' name='username' placeholder='username' />
<Input type='password' name='password' placeholder='password' />
<button> Sign In</button>
</form>
<a href='#'>Lost your password ?</a>
</div>
}
}
// Generic input field
class Input extends React.Component {
render() {
return <div className='Input'>
<input type={this.props.type} name={this.props.name} placeholder={this.props.placeholder} required />
<label htmlFor={this.props.name}></label>
</div>
}
}
// Fake logo
class Logo extends React.Component {
render() {
return <div className="logo">
<i><img src={logo} className="App-logo" alt="logo" /></i>
<span> Test </span>
</div>
}
}
// Button to brind the modal back
class ModalBack extends React.Component {
render() {
return (
<button className="bringitback" onClick={this.props.onClick} key={this.props.className}>Back to login page!</button>
);
}
}
export default App;
Thanks in Advance!
If you just want to catch data for now this will do the trick
fetch('https://randomuser.me/api?results=1')
.then(function(response) {
return response.json();
})
.then(function(myJson) {
console.log(JSON.stringify(myJson));
});
fetch('https://randomuser.me/api?results=1')
.then((response) => {
// check for status code from service if success
// set response in state such as login success
this.route.navigate(['/']);
})
.catch(error =>{
console.log(error);
});
})
Taking user to next page. Use react router for achieving this.
Step 1: Wrap your <App /> inside <BrowserRouter />
Now validate response if username/password are correct using service call.
Then this.route.navigate(['/']);
This will navigate user to home page of app after successful login.
Heres What I did, keep in mind I set up my backend with express/node.
I used Axios to fetch from my api.
onSubmit = (e) => {
e.preventDefault();
axios.get('API_PATH')
.then(res => {
const user = res.data[0].username;
const password = res.data[0].password;
const username = this.state.username;
const passwordEntered = this.state.password;
if(username === '' && passwordEntered === ''){
document.getElementById('status').innerHTML = '<p>Please Enter A Valid Username and Password</p>';
}else if(user === username && passwordEntered === password){
document.getElementById('status').innerHTML = '';
console.log(user, password)
}else{
document.getElementById('status').innerHTML = '<p>Please Enter A Valid Username and Password</p>';
}
})
.catch(error => {
console.log(error);
});
}
Here is the form I used.
<Form
>
<Form.Row>
<Form.Group as={Col}>
<Form.Label>Username</Form.Label>
<Form.Control
type="text"
name="username"
id="username"
value={this.state.value}
onChange={this.handleChange}
>
</Form.Control>
</Form.Group>
<Form.Group as={Col}>
<Form.Label>Password</Form.Label>
<Form.Control
type="text"
id="password"
name="password"
value={this.state.value}
onChange={this.handleChange}
/>
</Form.Group>
</Form.Row>
<Button className="btn btn-sm btn-light" onClick={this.onSubmit}>
<i style={redColor} className="fas fa-sign-in-alt"></i> Login
</Button>
</Form>