Ternary Operator - Conditional Rendering Advance

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Wed Jun 21 2023 00:23:59 GMT+0000 (Coordinated Universal Time)

Saved by @sarfraz_sheth #react.js

import React from "react";
import Form from "./Form";
var isLoggedIn = false;



function App() {
return <div className="container">
{isLoggedIn === true ? <h1>Hello Men</h1> : <Form />} // one option
{isLoggedIn ? <h1>Hello Men</h1> : <Form />}  // second option due the condition is already a boolean
{isLoggedIn ? <h1>Hello Men</h1> : null} // // third option you can set the false as nothing
{isLoggedIn && <h1>Hello Men</h1>  } // // fourth option exact as above null set but the condition is a double check expresion. Condition && Expresion => False && omit or True && render the expresion
</div>;
}
// alternative method of using this is by applying styles
var condition = true;
const customStyle = {color: "red"};
<p style={condition ? customStyle : nill} show the color if true or not </P

export default App;

Inject the function and action in one single expression wich is the Ternary Operator

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@sarfraz_sheth

constat and html with JS Inlins CSS Style if condition and dynamic inline style Component Import/Export JSX ES6 props in react Devtools - insert components in components loop from list to render map, filter, reduce, find, findindex substring (cut long tex) and map to create new array arrow function Conditionaly Rendering Ternary Operator - Conditional Rendering Advance useState Hook or autoupdate elements useState auto update - Timer practice Destructuring Array Destructuring array to call a function in it as in the useState function destructuring practice - nested object item name Event handling useState over and out form button Event Input change while typing maximo uso event, components and use state complex setstate and events complex usestate - store objects to be changebales spread operator ES6 spread operator ES6 - Practice add item in array Spread operator and map - Practice Oposite of Boolean previous value - Tree concept practice fileter or delete an array list with useState add Objects in array (event useState)

#react.js #redux

Check if token expires and logout user

const [ user, setUser ] = useState(JSON.parse(localStorage.getItem('profile'))); //convert to object

const logout = () =>{
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        setUser(null);
    }

    useEffect(()=>{
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        if(token){
            const decodedToken = decode(token)
            if(decodedToken.exp*1000 < newDate().getTime()) logout();
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        setUser(JSON.parse(localStorage.getItem('profile')))
    },[location])

##javascript ##js #next.js #react.js

Animate header on scroll with Next.js & TailwindCSS

const [animateHeader, setAnimateHeader] = useState(false)

useEffect(() => {
  const listener = () =>
  window.scrollY > 140 ? setAnimateHeader(true) : setAnimateHeader(false)
  window.addEventListener('scroll', listener)
  return () => {
    window.removeEventListener('scroll', listener)
  }
}, [])

// Example usage with TailwindCSS:
<div className={`bg-header/75 transition duration-500 ease-in-out ${animateHeader && 'bg-header/[0.95]'}`}>...</div>

React Color Gradients

https://codepen.io/marcobiedermann/pen/WNGWzYR

#react.js #javascript #checkboxtoggle

javascript - How to toggle boolean state of react component? - Stack Overflow

function App() {
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    <input
      type="checkbox"
      checked={checked}
      onChange={toggleChecked}
    />
  );
}

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lowercase, uppercase, remove spaces ( trim ) , capitalize first letter

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cityCapitalized = city.charAt(0).toUpperCase() + city.slice(1);

Open new window onclick reactJS

onClick={() => window.open(url, "_blank")}

Определяет клик вне компонента

import { useEffect } from 'react';

export const useClickOutside = (ref, setIsModalOpen) => {
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};

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https://useworker.js.org/

React JSX Iterating a List/Array

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}

#javascript #react.js

Hooks at a Glance – React

import React, { useState, useEffect } from 'react';

function Example() {
  const [count, setCount] = useState(0);


  // Similar to componentDidMount and componentDidUpdate:
  useEffect(() => {
    // Update the document title using the browser API
    document.title = `You clicked ${count} times`;
  });

  return (
    <div>
      <p>You clicked {count} times</p>
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        Click me
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}

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loop in react jsx

render() {
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    items.push(<li key={index}>{value}</li>)
  }

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    <div>
      {items}
    </div>
  )
}

////////// or:

render: function() {
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  return (
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      {elements.map((value, index) => {
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      })}
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Material UI style snippet

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GRID material ui

<Grid container><Grid item></Grid></Grid>

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// A custom theme for this app
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export default theme;

#react.js #setstate

A correct way to log the current state after the update would be:

this.setState({ name: 'Matt' }, () => console.log(this.state.name))

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