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Example Using Hooks useEffect

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mouaadBch answered on April 3, 2020 Popularity 9/10 Helpfulness 2/10

answer Example Using Hooks useEffect

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Example Using Hooks useEffect

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

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

  useEffect(() => {
    document.title = `You clicked ${count} times`;
  });

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: reactjs.org

Tags: javascript use-effect using

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Contributed on Sep 12 2022

mouaadBch

0 Answers Avg Quality 2/10

Closely Related Answers

useEffectOnce react hook

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import { EffectCallback, useEffect } from 'react'

function useEffectOnce(effect: EffectCallback) {
  // eslint-disable-next-line react-hooks/exhaustive-deps
  useEffect(effect, [])
}

export default useEffectOnce

Popularity 9/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: hook

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Contributed on Feb 10 2023

Mehedi Islam Ripon

0 Answers Avg Quality 2/10

useeffect react example

Comment

import React, { useEffect, useState } from "react";
import ReactDOM from "react-dom";

function Reddit() {
  // Initialize state to hold the posts
  const [posts, setPosts] = useState([]);

  // effect functions can't be async, so declare the
  // async function inside the effect, then call it
  useEffect(() => {
    async function fetchData() {
      // Call fetch as usual
      const res = await fetch(
        "https://www.reddit.com/r/reactjs.json"
      );

      // Pull out the data as usual
      const json = await res.json();

      // Save the posts into state
      // (look at the Network tab to see why the path is like this)
      setPosts(json.data.children.map(c => c.data));
    }

    fetchData();
  }); // <-- we didn't pass a value. what do you think will happen?

  // Render as usual
  return (
    <ul>
      {posts.map(post => (
        <li key={post.id}>{post.title}</li>
      ))}
    </ul>
  );
}

ReactDOM.render(
  <Reddit />,
  document.querySelector("#root")
);

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: daveceddia.com

Tags: javascript j

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Contributed on Jan 04 2022

Akmal

0 Answers Avg Quality 2/10

how to use useeffect

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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>
  );
}

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: reactjs.org

Tags: javascript j

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Contributed on Aug 23 2020

Testy Tarsier

0 Answers Avg Quality 2/10

React useEffect Hook

Comment

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

const App = () => {
  const [color, setColor] = useState("black");

  useEffect(() => {
    const changeColorOnClick = () => {
      if (color === "black") {
        setColor("red");
      } else {
        setColor("black");
      }
    };
    
    document.addEventListener("click", changeColorOnClick);

    return () => {
      document.removeEventListener("click", changeColorOnClick);
    };
  }, [color]);

  return (
    <div>
      <div
        id="myDiv"
        style={{
          color: "white",
          width: "100px",
          height: "100px",
          position: "absolute",
          left: "50%",
          top: "50%",
          backgroundColor: color,
        }}
      >
        This div can change color. Click on me!
      </div>
    </div>
  );
};

export default App;

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: www.theodinproject.com

Tags: hook

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Contributed on Apr 18 2022

Andrea Maiolo

0 Answers Avg Quality 2/10

React useEffect Hooks

Comment

import { useState, useEffect } from "react";
import ReactDOM from "react-dom/client";

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

  useEffect(() => {
    setTimeout(() => {
      setCount((count) => count + 1);
    }, 1000);
  });

  return <h1>I've rendered {count} times!</h1>;
}

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<Timer />);

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 24 2022

naly moslih

0 Answers Avg Quality 2/10

how to use React useEffect Hook

Comment

most common cases how useEffect implementation: 
- fetch data from API, 
- directly updating the DOM, 
- use timers and real-time data displays (such as BTC current price)
- validating input field
- trigger animation on new array value
- 

// 1- EVERY RERENDER
useEffect( () => {
  console.log("It runs everytime this component rerenders")
  });

// 2- ON MOUNT
useEffect( () => {
   console.log("It Only runs once (When the component gets mounted)")
   }, []);

// 3- DEPENDING ON CONDITION
useEffect( () => {
   console.log("It runs everytime the condition is changed")
   }, [condition]); //basically the dependency array determines when the rerender happens

// 4- DEPENDING ON CONDITION, BUT WITH "clean up"
useEffect( () => {
	console.log("It runs everytime my condition is changed")
	return () => {
    	console.log("Use this return as a 'clean up tool' (it runs before the actual code)")
        }
    }, [condition]);

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: hook

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Contributed on Aug 31 2022

Gabriele Orlandi

0 Answers Avg Quality 2/10

react hook useeffect

Comment

//This is a basic example, carefully read the docs as
//useEffect it's like componentDidMount/WillUnmount
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>
  );
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: it.reactjs.org

Tags: hook

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Contributed on Apr 03 2020

POG

0 Answers Avg Quality 2/10

useEffect Hook in React

Comment

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

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

//The effect runs after each render since no dependencies are specified.
//run each render
useEffect(() => {
	console.log("no depencies, no test");
})

//The effect runs once after the initial render due to the empty dependency array.
//only run start
useEffect(() => {
	console.log("include depencies, no test");
},[])

//The effect runs after the initial render and whenever the count state variable changes.
//run start render and when changing count
useEffect(() => {
	console.log("include depencies and test");
},[count])

return(
<div classsName="container">
	<h2>{count}</h2>
<button onClick={() => setCount(count + 1)} > click </button>
</div>

Popularity 9/10 Helpfulness 2/10 Language whatever

Source: Grepper

Tags: hook

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Contributed on May 07 2023

WinMaw

0 Answers Avg Quality 2/10

React useEffect, useState

Comment

function useFriendStatus(friendID) {
  const [isOnline, setIsOnline] = useState(null);

  // ...

  return isOnline;
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: reactjs.org

Tags: javascript j

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Contributed on Nov 01 2021

Crowded Cormorant

0 Answers Avg Quality 2/10

when to use useEffect

Comment

What does useEffect do? By using this Hook, you tell React that 
your component needs to do something after render. 
React will remember the function you passed (we’ll refer to it 
as our “effect”), and call it later after performing the DOM updates.

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: Grepper

Tags: use-effect u

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Contributed on Aug 27 2022

ABDELLATIF ANAFLOUS

0 Answers Avg Quality 2/10

Example Using Hooks useEffect

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Example Using Hooks useEffect

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