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CSS

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HTML 

              
                <header>
	jquery-data-api
	<span>todo örneği</span>
</header>

<div class="container">
	<form onsubmit="return false">
		<div class="flex-container">
			<div class="flex-item flex-auto">
				<input type="text" data-state="todo" placeholder="Todo başlığınızı yazın">
			</div>
			<div class="flex-item">
				<label>
					<input type="checkbox" data-state="done" value="1">
					Yapıldı olarak işaretle
				</label>
			</div>
			<div class="flex-item flex-button">
				<button type="submit" onclick="addTodo()">Ekle</button>
			</div>
		</div>
	</form>

	<div data-show="$state.todos && $state.todos.length > 0" class="todos">
		<h3>Todo Listesi</h3>
		<ul data-for="todos" data-as="todo">
			<template>
				<li class="{todo.done ? 'done' : ''}" onclick="updateTodo({todo})">
					<span>
						{todo.content}
					</span>
					<button onclick="deleteTodo('{todo.id}', event)">Sil</button>

				</li>
			</template>
		</ul>
		<div class="flex-container" data-show="$state.todos && $state.todos.length > 1">
			<div class="flex-item flex-button">
				<button onclick="reverseTodo()">Sırayı Tersine Çevir</button>
			</div>
		</div>
	</div>
</div>
!

CSS 

              
                * {
    padding: 0;
    margin: 0;
    list-style: none;
    border: 0;
    box-sizing: border-box;
    text-decoration: none;
}

body {
    background: #eee;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif
}

header {
    height: 60px;
    background: #fff;
    border-bottom: 1px solid #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}
header span {
    margin-left: 15px;
    padding-left: 15px;
    border-left: 1px solid #ddd;
    color: rgb(39, 74, 230);
}

.container {
    width: 800px;
    max-width: 100%;
    margin: 0 auto;
    background: #fff;
    padding: 15px;
    border-radius: 3px;
    box-shadow: 3px 5px 10px 0 rgba(0,0,0,.1);
}

input[type="text"] {
    width: 100%;
    height: 50px;
    border: 1px solid #ddd;
    padding: 0 15px;
    font-size: 16px;
    border-radius: 3px;
}

.flex-container {
    display: flex;
    gap: 10px;
    align-items: center;
}
.flex-item {
    flex: 1;
}
.flex-auto {
    flex: auto;
}

.flex-button button {
    width: 100%;
    height: 50px;
    background: rgb(39, 74, 230);
    border-radius: 3px;
    font-size: 16px;
    color: #fff;
    cursor: pointer;
}

.todos {
    padding: 15px;
    background: rgba(39, 74, 230, 0.027);
    margin-top: 15px
}

.todos h3 {
    margin-bottom: 10px;
}

.todos ul li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 50px;
    border-bottom: 1px solid #ddd;
}

.todos ul li button {
    height: 35px;
    padding: 0 15px;
    background: rgb(39, 74, 230);
    border-radius: 3px;
    color: #fff;
    cursor: pointer;
}

.todos ul li span {
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
}


.todos ul li.done {
    box-shadow: 3px 0 0 0 green inset;
    padding-left: 10px;
}

.todos ul li.done span {
    text-decoration: line-through;
}
!

JS 

              
                let s4 = () => {
    return Math.floor((1 + Math.random()) * 0x10000)
        .toString(16)
        .substring(1);
  }

setState('todos', []);

const addTodo = () => {
    if (!$state.todo) {
        alert('Lütfen bir todo başlığı belirtin!');
    } else {

        const find = $state.todos.find(t => t.content === $state.todo);
        if (find) {
            alert('Böyle bir todo zaten ekli!');
        } else {

            const newTodo = {
                id: s4(),
                content: $state.todo,
                done: $state.done
            };
            updateState('todos', [newTodo, ...$state.todos]);
            updateState('todo', '')
            updateState('done', false)

        }
    }
}

const deleteTodo = (id, e) => {
    e.stopPropagation();
    updateState('todos', $state.todos.filter(t => t.id !== id));
}

const updateTodo = (todo) => {
    updateState('todos', $state.todos.map(t => {
        if (t.id === todo.id) {
            t.done = !todo.done;
        }
        return t
    }))
}

const reverseTodo = () => {
    updateState('todos', $state.todos.reverse());
}
!
999px

Console