textbox.js

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

const logout = () =>{
        dispatch({type: 'LOGOUT'});
        history.push("/");
        setUser(null);
    }

    useEffect(()=>{
        const token = user?.token;

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

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>

function App() {
  const [checked, setChecked] = useState(false);
  const toggleChecked = () => setChecked(value => !value);
  return (
    <input
      type="checkbox"
      checked={checked}
      onChange={toggleChecked}
    />
  );
}

// making all uppercase
city.toUpperCase();

//removing spaces and making all lowercase
city = city.trim().toLowerCase();

//capitalizing the first letter
cityCapitalized = city.charAt(0).toUpperCase() + city.slice(1);

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

import { useEffect } from 'react';

export const useClickOutside = (ref, setIsModalOpen) => {
  useEffect(() => {
    function handleClickOutside(event) {
      if (ref.current && !ref.current.contains(event.target)) {
        setIsModalOpen(false)
      }
    }
    document.addEventListener("mousedown", handleClickOutside);
    return () => {
      document.removeEventListener("mousedown", handleClickOutside);
    };
  }, [ref]);
};

import React from 'react';
import {
  Button,
  DrawerLayoutAndroid,
  Text,
  TextInput,
  View,
} from 'react-native';

import {NavigationContainer} from '@react-navigation/native'
import {createStackNavigator} from '@react-navigation/stack'
import axios from 'axios'
import {createDrawerNavigator} from '@react-navigation/drawer'
import {createBottomTabNavigator} from '@react-navigation/bottom-tabs'
import LoginTextbox from './components/Textbox'
import Class_comp from './components/Class_comp';
import Func_comp from './components/Func_comp'
import { useState } from 'react';
// import FlatList from './components/FlatList'

// const drawer = createDrawerNavigator()
const stack = createStackNavigator()
// const tab = createBottomTabNavigator()

 
function App(){  
    return(
       <NavigationContainer>
         <stack.Navigator>
           <stack.Screen name="Login" component={Appdata}/>
           <stack.Screen name="Home" component={home}/>
         </stack.Navigator>
       </NavigationContainer>
    )
}

const Appdata = (props) =>
{
  Data = [stateupt.cardnum, stateupt.pass]
  URL1 = 'https://scrapcollector12.000webhostapp.com/cardLogin.php'
  const LoginPress2 = () => {
    Post = async (URL1, Data) => {
      return await axios.post(URL1, Data
        .then(function (response) {
          console.warn(response);
        }
        .catch(function (error) {
          console.warn(error);
        }))
        );       
      }
  }
  const [state, stateupt] = useState({cardnum:'', pass:''})
  console.warn(state)
  return(
      <View >
        <LoginTextbox 
          placeholder='Enter card Number'
          keyboardType='numeric'
          placeholderTextColor='darkgrey'
          width='60%'
          value={state.cardnum}
          onChangeText={(e) => stateupt({cardnum:e})}
        />
         <LoginTextbox 
          placeholder='Enter Your Password'
          secureTextEntry={true}
          placeholderTextColor='darkgrey'
          width='60%'
          value={state.pass}
          onChangeText={(e) => stateupt({pass:e})}
        />
       <Button style={{}} title="Login" onPress={()=> props.navigation.navigate('Home')}/> 
      </View>
  )
}
const home = (props) => {
  const data = "some data!!!"

  return (
    <View>
       <Text style={{fontSize:30}}>Functional Component!!!</Text>
       <TextInput placeholder={"Enter Your Name"} onChangeText={(e)=>{console.warn(e)} }/>
       <Button title="Go to next Screen" onPress={() => props.navigation.navigate('Detail')}/>
       <Func_comp Data={data} />
    </View>
  )
}

function Detailscr()
{
    return(
      <View>
        <Text style={{fontSize:50}}>Details screen</Text>
      </View>
    )
}
class Class_comp1 extends React.Component
{
    render()
    {
        return(
            <View>
                <Text style={{fontSize:60,}}>From Class_comp</Text>
                <Button title="Btn from class" onPress={()=> alert("from class comp")}/>
            </View>
        )
    }
}

export default App;

import React from 'react';
import {
  Button,
  DrawerLayoutAndroid,
  Text,
  placeholder,
  TextInput,
  View,
  StyleSheet
} from 'react-native';
import { NavigationContainer } from '@react-navigation/native'
import { createStackNavigator } from '@react-navigation/stack'
import { Value } from 'react-native-reanimated';
import { WHITE } from '../styles/colors/colors';

const LoginTextbox = (props) => {
  return (
    <View style={styles.flex}>
      <TextInput
        placeholder = {props.placeholder}
            keyboardType = {props.keyboardType}
            secureTextEntry = {props.secureTextEntry}
            placeholderTextColor={props.placeholderTextColor}
            width={props.width}
            value = {props.value}
            style={styles.container}
            onChangeText = {props.onChangeText}
      />
    </View>
  )
}

const styles = StyleSheet.create({
  flex:{flexDirection:'row', borderWidth:1, width: '100%'},
   container:{width: 200}
})

export default LoginTextbox;

import React from 'react';
import {
  Button,
  DrawerLayoutAndroid,
  Text,
  TextInput,
  View,
} from 'react-native';

import {NavigationContainer} from '@react-navigation/native'
import {createStackNavigator} from '@react-navigation/stack'
import axios from 'axios'
import {createDrawerNavigator} from '@react-navigation/drawer'
import {createBottomTabNavigator} from '@react-navigation/bottom-tabs'
import LoginTextbox from './components/Textbox'
import Class_comp from './components/Class_comp';
import Func_comp from './components/Func_comp'
import { useState } from 'react';
// import FlatList from './components/FlatList'

// const drawer = createDrawerNavigator()
const stack = createStackNavigator()
// const tab = createBottomTabNavigator()

 
function App(){  
    return(
       <NavigationContainer>
         <stack.Navigator>
           <stack.Screen name="Login" component={Appdata}/>
           <stack.Screen name="Home" component={home}/>
         </stack.Navigator>
       </NavigationContainer>
    )
}

const Appdata = (props) =>
{
 const [state, stateupt] = useState({cardnum:'', pass:''})
 const LoginPress2 = () => {
    // URL1 = 'https://scrapcollector12.000webhostapp.com/cardLogin.php'
    // Post = async (URL1, Data) => {
     
    //   return await axios.post(URL1, Data
    //     .then(function (response) {
    //       console.warn(response);
    //     }
    //     .catch(function (error) {
    //       console.warn(error);
    //     }))
    //     );       
    //   }
    var cardno = state.cardnum
    var password = state.pass
    if(cardno.length == 0 || password.length == 0)
    {
      alert("Required Fields Missing!")
    }else 
    {
      let URL = 'https://scrapcollector12.000webhostapp.com/cardLogin.php'
      var headers = {
          'Accept' : 'application/json',
          'Content-Type': 'application.json' 
      }
      var Data =
      {
        cardno: cardno,
        password: password
      }
      fetch(URL, {
        method: 'POST',
        headers: headers,
        body: JSON.stringify(Dat)
      })
      .then((response)=> response.json())
      .then((response) => 
      {
        alert(response[0].Message)
      })
      .catch(error =>
        {
          alert("Error" + error)
        }
      )
      // axios.post('https://scrapcollector12.000webhostapp.com/cardLogin.php', {
          
      // })
      // .then(function (response) {
      //   console.warn(response);
      // })
      // .catch(function (error) {
      //   console.warn(error);
      // });
    }
  }
  console.warn(state)
  return(
      <View >
        <LoginTextbox 
          placeholder='Enter card Number'
          keyboardType='numeric'
          placeholderTextColor='darkgrey'
          width='60%'
          value={state.cardnum}
          onChangeText={(e) => stateupt({...state, cardnum:e})}
        />
         <LoginTextbox 
          placeholder='Enter Your Password'
          secureTextEntry={true}
          placeholderTextColor='darkgrey'
          width='60%'
          value={state.pass}
          onChangeText={(e) => stateupt({...state,pass:e})}
        />
        <Text>{state.cardnum}</Text>
        <Text>{state.pass}</Text>
       <Button style={{}} title="Login" onPress={()=> {LoginPress2} /*(props.navigation.navigate('Home')*/}/> 
      </View>
  )
}
const home = (props) => {
  const data = "some data!!!"

  return (
    <View>
       <Text style={{fontSize:30}}>Functional Component!!!</Text>
       <TextInput placeholder={"Enter Your Name"} onChangeText={(e)=>{console.warn(e)} }/>
       <Button title="Go to next Screen" onPress={() => props.navigation.navigate('Detail')}/>
       <Func_comp Data={data} />
    </View>
  )
}

function Detailscr()
{
    return(
      <View>
        <Text style={{fontSize:50}}>Details screen</Text>
      </View>
    )
}
class Class_comp1 extends React.Component
{
    render()
    {
        return(
            <View>
                <Text style={{fontSize:60,}}>From Class_comp</Text>
                <Button title="Btn from class" onPress={()=> alert("from class comp")}/>
            </View>
        )
    }
}

export default App;

this.state = {
	zombies:[
    {
    	name: 'Zombie'
    },{
    	name: 'Zombie'
    } {
    	name: 'Zombie'
    } {
    	name: 'Zombie'
    } {
    	name: 'Zombie'
    }
    ]
}

render() {
	return (
    	<div>
        {
        	this.state.zombies.map(zombie => <h1>{zombie.name}</h1>)
        }
        
        </div>
    )
}

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>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

render() {
  const elements = ['one', 'two', 'three'];

  const items = []

  for (const [index, value] of elements.entries()) {
    items.push(<li key={index}>{value}</li>)
  }

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

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

render: function() {
  const elements = ['one', 'two', 'three'];
  return (
    <ul>
      {elements.map((value, index) => {
        return <li key={index}>{value}</li>
      })}
    </ul>
  )
}

const useStyles = makeStyles((theme) => ({}));