javascript todo list

자바스크립트를 이용해서 todo list app을 만들어 보았다.

가장 기본적인 appendChild부터 classList 또한 localstorage 까지 이용해서 구현해보았다.

//Selecter
const todoInput = document.querySelector(".todo-input");
const todoButton = document.querySelector(".todo-button");
const todoList = document.querySelector(".todo-list");

//Event
document.addEventListener("DOMContentLoaded", getTodos);
todoButton.addEventListener("click", addTodo);
todoList.addEventListener("click", deleteTodo);

//Functions
function addTodo(e) {
  // 새로고침 방지
  e.preventDefault();

  // todo Div 만들기
  const todoDiv = document.createElement("div");
  todoDiv.classList.add("todo");

  // todo li 붙여주기
  const newTodo = document.createElement("li");
  newTodo.innerText = todoInput.value;

  // 로컬스토리지에 저장
  saveLocalTodos(todoInput.value);

  newTodo.classList.add("todo-item");
  todoDiv.appendChild(newTodo);
  todoInput.value = "";

  // 완료버튼 생성
  const completedButton = document.createElement("button");
  completedButton.innerHTML = `<i class="fas fa-check"></i>`;
  completedButton.classList.add("complete-btn");
  todoDiv.appendChild(completedButton);

  // 삭제버튼 생성
  const trashButton = document.createElement("button");
  trashButton.innerHTML = `<i class="fas fa-trash"></i>`;
  trashButton.classList.add("trash-btn");
  todoDiv.appendChild(trashButton);

  todoList.appendChild(todoDiv);
}

function deleteTodo(e) {
  const item = e.target;

  // 삭제버튼일때
  if (item.classList[0] === "trash-btn") {
    const todo = item.parentElement;
    todo.classList.add("fall");

    removeLocalTodos(todo);
    todo.addEventListener("transitionend", e => {
      todo.remove();
    });
  }

  // 완료버튼일때
  if (item.classList[0] === "complete-btn") {
    const todo = item.parentElement;
    todo.classList.toggle("completed");
    console.log(todo);
  }
}

// 로컬스토리지 관려작업
function saveLocalTodos(todo) {
  let todos;
  if (localStorage.getItem("todos") === null) {
    todos = [];
  } else {
    todos = JSON.parse(localStorage.getItem("todos"));
  }
  todos.push(todo);
  localStorage.setItem("todos", JSON.stringify(todos));
}
function removeLocalTodos(todo) {
  let todos;
  if (localStorage.getItem("todos") === null) {
    todos = [];
  } else {
    todos = JSON.parse(localStorage.getItem("todos"));
  }
  const todoIndex = todo.children[0].innerText;
  todos.splice(todos.indexOf(todoIndex), 1);
  localStorage.setItem("todos", JSON.stringify(todos));
}

// 실행시에 로컬스토리지에 데이터가있으면 가져온다.
function getTodos() {
  let todos;
  if (localStorage.getItem("todos") === null) {
    todos = [];
  } else {
    todos = JSON.parse(localStorage.getItem("todos"));
  }
  todos.forEach(function(todo) {
    
    const todoDiv = document.createElement("div");
    todoDiv.classList.add("todo");

    const newTodo = document.createElement("li");
    newTodo.innerText = todo;
    newTodo.classList.add("todo-item");
    todoDiv.appendChild(newTodo);
    todoInput.value = "";

    const completedButton = document.createElement("button");
    completedButton.innerHTML = `<i class="fas fa-check"></i>`;
    completedButton.classList.add("complete-btn");
    todoDiv.appendChild(completedButton);

    const trashButton = document.createElement("button");
    trashButton.innerHTML = `<i class="fas fa-trash"></i>`;
    trashButton.classList.add("trash-btn");
    todoDiv.appendChild(trashButton);
    //attach final Todo
    todoList.appendChild(todoDiv);
  });
}

html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>TodoList</title>
    <link
      href="https://fonts.googleapis.com/css?family=Poppins&display=swap"
      rel="stylesheet"
    />
    <link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/all.min.css"
      integrity="sha256-mmgLkCYLUQbXn0B1SRqzHar6dCnv9oZFPEC1g1cwlkk="
      crossorigin="anonymous"
    />
    <link rel="stylesheet" href="./style.css" />
  </head>
  <body>
    <header>
      <h1>Todo List</h1>
    </header>
    <form>
      <input type="text" class="todo-input" />
      <button class="todo-button" type="submit">
        <i class="fas fa-plus-square"></i>
      </button>
    </form>
    <div class="todo-container">
      <ul class="todo-list"></ul>
    </div>
    <script src="./app.js"></script>
  </body>
</html>

css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-image: linear-gradient(120deg, #4356be 0%, #3d59b4 100%);
  color: white;
  font-family: "Poppins", sans-serif;
  min-height: 100vh;
}
header {
  font-size: 2rem;
}

header,
form {
  min-height: 20vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
form input,
form button {
  padding: 0.5rem;
  font-size: 2rem;
  border: none;
  background: white;
}
form button {
  color: #4356be;
  background: #fff;
  cursor: pointer;
  transition: all 0.3s ease;
}
form button:hover {
  background: #4356be;
  color: white;
}
.todo-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.todo-list {
  min-width: 30%;
  list-style: none;
}

.todo {
  margin: 0.5rem;
  background: white;
  font-size: 1.5rem;
  color: black;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all .2s ease;
}
.filter-todo {
  padding: 1rem;
}
.todo li {
  flex: 1;
}

.trash-btn,
.complete-btn {
  background: #1f2e85;
  color: white;
  border: none;
  padding: 1rem;
  cursor: pointer;
  font-size: 1rem;
}
.complete-btn {
  background: #1f2e85;
}
.todo-item {
  padding: 0rem 0.5rem;
}

.fa-trash,
.fa-check {
  pointer-events: none;
}

.completed {
  text-decoration: line-through;
  opacity: 0.5;
}

.fall { 
  display: none;
}

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javascript todo list

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