React?? ? ? ?? ???

??? ?????? ??? To-Do List ?? ??? ?? React ????? ??????. ? ????? ?? React ??, ?? ?? ? ??? ??? ?? ??? ????? ??? ???? ???? ?? ?? ???? ??? ??? ? ?????.

?? ??? ??? ??? ??????.

1. ???? ??
?? ??? ?? useState ??? ????? ToDoList.jsx? ??????. ?? ?? ?? ??? ???? ?????? ???? ? ?????. ??? ?? ??? ?? ?? ?????.

import React, { useState } from 'react';

export default function ToDoList() {
  const [tasks, setTasks] = useState([]);
  const [newTask, setNewTask] = useState("");

  function handleInputChange(event) {
    setNewTask(event.target.value); // Enables us to see what we type
  }

  function addTask() {
    if (newTask.trim() !== "") {
      setTasks(t => [...t, newTask]); // Adds the new task to the task list
      setNewTask(""); // Resets the input field
    }
  }
}

2. ?? ?? ? ??
??? ???? ???? ?? ??? ???? ??? ?????. addTask ??? ??? ???? ?? ??? ???? ???? ??, deleteTask? ???? ???? ?? ??? ?????.

function deleteTask(index) {
  const updatedTasks = tasks.filter((_, i) => i !== index); // Removes the task at the given index
  setTasks(updatedTasks);
}

3. ??? ???? ??
????? ?? ?? ??? ?? ???? ???? ??????. moveTaskUp ? moveTaskDown ??? ???? ???? ??? ??????.

function moveTaskUp(index) {
  if (index > 0) {
    const updatedTasks = [...tasks];
    [updatedTasks[index], updatedTasks[index - 1]] = [updatedTasks[index - 1], updatedTasks[index]];
    setTasks(updatedTasks);
  }
}

function moveTaskDown(index) {
  if (index < tasks.length - 1) {
    const updatedTasks = [...tasks];
    [updatedTasks[index], updatedTasks[index + 1]] = [updatedTasks[index + 1], updatedTasks[index]];
    setTasks(updatedTasks);
  }
}

4. CSS? ??? ??
?? ????? ????? ??? ?? index.css? ??? ?? ???? ??????. ?? ??? ??? ????.

?? ???:

button {
  font-size: 1.7rem;
  font-weight: bold;
  padding: 10px 20px;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.5s ease;
}
.add-button {
  background-color: hsl(125, 47%, 54%);
}
.add-button:hover {
  background-color: hsl(125, 47%, 44%);
}

?? ?? ????:

li {
  font-size: 2rem;
  font-weight: bold;
  padding: 15px;
  background-color: hsl(0, 0%, 97%);
  margin-bottom: 10px;
  border: 3px solid hsla(0, 0%, 85%, 0.75);
  border-radius: 5px;
  display: flex;
  align-items: center;
}

5. ???? ? ? ??
ToDoList.jsx ?? ???? ?? ?? ??? ?????? ??? ????.

return (
  <div className='to-do-list'>
    <h1>To-Do List</h1>
    <div>
      <input 
        type='text'
        placeholder='Enter a task...'
        value={newTask}
        onChange={handleInputChange}
      />
      <button className='add-button' onClick={addTask}>
        Add
      </button>
    </div>

    <ol>
      {tasks.map((task, index) => (
        <li key={index}>
          <span className='text'>{task}</span>
          <button className='delete-button' onClick={() => deleteTask(index)}>Delete</button>
          <button className='move-button' onClick={() => moveTaskUp(index)}>??</button>
          <button className='move-button' onClick={() => moveTaskDown(index)}>?</button>
        </li>
      ))}
    </ol>
  </div>
);

?? ???

1. React ??: useState ??? ?? ?? ?? ??? ???? ???? ?????.
2. ??? ??: handlerInputChange, addTask ? deleteTask? ?? ??? ??? ?? ??? UI? ????? ? ?? ??? ?????.
3. ?? ?? ???: ??? ???? ??? ???? ?? ???? ??? ???? ???.
4. ???? ?? ??: CSS ?? ??? ??? ???? ??? ??? ?????.

????

????
GitHub?? ? ????? ?? ?? ??? ???? ? ????.
? ? ? ?? React ? ???

????? ???? ???? ???? ??? ???!

? ??? ?? React ??: 28??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!