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HTML 

              
                <header>
	jquery-data-api
	<span>para harcama örneği</span>
</header>

<div class="container">

	<div class="total-money" data-class="[$state.money - $state.total === 0, 'empty']" data-block>
		<div data-show="$state.money - $state.total !== 0">
			Harcamak için {moneyFormat($state.money - $state.total)} paranız var!
		</div>
		<div data-show="$state.money - $state.total === 0">
			Paran bitti, parasız insan boş insandır!
		</div>
	</div>

	<ul data-for="items" data-as="item" class="items">
		<template>
			<li>
				<div class="title">
					{item.name}
				</div>
				<div class="price">
					{moneyFormat(item.price)}
				</div>
				<div class="actions">
					<button data-disabled="!$state.basket.find(i => i.id === {item.id})" onclick="removeBasket({item})" class="sell-btn">Sat</button>
					<div class="amount" data-expression="$state.basket.find(item => item.id === {item.id})?.amount || 0"></div>
					<button data-disabled="$state.total + {item.price} > $state.money" onclick="addBasket({item})" class="buy-btn">Al</button>
				</div>
			</li>
		</template>
	</ul>

	<div class="basket" data-show="$state.basket && $state.basket.length">
		<h3>Alışveriş Detayları</h3>
		<ul data-for="basket" data-as="item">
			<template>
				<li class="basket-item">
					{getProduct(item.id).name} <span>x {item.amount}</span>
				</li>
			</template>
		</ul>
		<div class="total" data-block>
			Toplam: {moneyFormat($state.total)}
		</div>
		<button class="basket-reset-btn" onClick="resetBasket()">Sepeti Sıfırla</button>
	</div>

</div>

<script>
const moneyFormat = (price) => {
		return new Intl.NumberFormat('tr-TR', { style: 'currency', currency: 'TRY' }).format(price);
}
</script>
!

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);
}

.items {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}
.items li {
    width: calc(50% - 15px);
}
.items li .title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 5px;
}
.items li .price {
    color: rgb(39, 74, 230);
}

.items li .actions {
    display: flex;
    margin-top: 10px;
    align-items: center;
}
.items li .actions .amount {
    min-width: 50px;
    text-align: center;
}
.items li .actions button {
    flex: 1;
    height: 30px;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
}
.items li .actions button.sell-btn {
    background: #ccc;
}
.items li .actions button.buy-btn {
    background: #61dafb;
}

[disabled] {
    opacity: .4;
    pointer-events: none;
}

.total-money {
    background: linear-gradient(to bottom, #20b820, #14be2a);
    padding: 15px;
    text-align: center;
    color: #fff;
    margin-bottom: 25px;
    border-radius: 4px;
}
.total-money.empty {
    background: red
}

.basket {
    padding-top: 20px;
    margin-top: 20px;
    border-top: 1px solid #ddd;
}
.basket h3 {
    margin-bottom: 15px;
}
.basket ul {
    padding-bottom: 15px;
    margin-bottom: 15px;
    border-bottom: 1px solid #ddd;
}
.basket ul li {
    margin-bottom: 5px;
}
.basket ul li span {
    color: #999;
}
.basket .total {
    font-size: 18px;
    font-weight: bold;
    text-align: right;
    color: #179b17;
}
.basket .basket-reset-btn {
    background: #61dafb;
    height: 40px;
    padding: 0 20px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
}
!

JS 

              
                const getAmount = (id) => {
    const find = $state.basket.find(item => item.id === id)
    if (find) {
        return find.amount;
    }
    return 0;
}

const addBasket = (product) => {
    const checkBasket = $state.basket.find(item => item.id === product.id)

    // ürün daha önce eklenmiş
    if (checkBasket) {
        checkBasket.amount += 1
        updateState('basket', [...$state.basket.filter(item => item.id !== product.id), checkBasket])
    } else {
        updateState('basket', [...$state.basket, {
            id: product.id,
            amount: 1
        }])
    }
}

const removeBasket = (product) => {
    const currentBasket = $state.basket.find(item => item.id === product.id)
    const basketWithoutCurrent = $state.basket.filter(item => item.id !== product.id)
    currentBasket.amount -= 1
    if (currentBasket.amount === 0) {
        updateState('basket', [...basketWithoutCurrent])
    } else {
        updateState('basket', [...basketWithoutCurrent, currentBasket])
    }
}

const resetBasket = () => {
    updateState('basket', []);
}

const getProduct = (id) => {
    return $state.items.find(p => p.id === id)
}

setState('basket', []);
setState('total', 0);
setState('money', 750000);
const items = [
	{
		id: 1,
		name: 'Ekmek',
		price: 1
	},
	{
		id: 2,
		name: 'Ayakkabı',
		price: 50
	},
	{
		id: 3,
		name: 'Tişört',
		price: 25
	},
	{
		id: 4,
		name: 'Motor',
		price: 5500
	},
	{
		id: 5,
		name: 'Araba',
		price: 100000
	}
];
setState('items', items);

stateEffect((basket) => {
	updateState(
		'total',
		basket.reduce((acc, item) => {
			return acc + (item.amount * ($state.items.find(product => product.id === item.id).price))
		}, 0)
	)
}, ['basket'])

// eğer etkilenecek state varsa diğer stateEffect'ten önce tanımlamak gerekiyor
// bu örnekte basket stateini güncelleyip yukarıda ise güncellenen değeri alabiliyoruz
stateEffect(() => {
	const basket = [
		{
			id: 3,
			amount: 2
		}
	];
	updateState('basket', basket);
});
!
999px

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