I’m fairly new to JS and I currently working on the front-end of a very basic ecommerce page as a personal project.
Here’s my question, all the “items” on the page are exact the same aside from their name. When I click on “buy”, I’d like to send the name of the respective item to the cart. However every time I click on any buy button, instead of sending the title of the item I just clicked, it always sends the “Item 1”.
I’ve been trying to figure this out for sometime now but no luck so far.
Thanks in advance!
–HTML–
JavaScript
x
92
92
1
<body>2
<div id="navbar">3
<p id="logo">eCommerce</p>4
<div id="cart">5
<img src="icons/shoppingcart.svg" alt="cart" id="cart-icon">6
<a href="#" id="cart-quantity"></a>7
</div>8
</div>9
10
<div id="cart-container">11
<div id="cart-content">12
<p id="cart-items">Your cart is empty</p>13
</div>14
</div>15
16
<div id="items">17
<div class="product">18
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">19
<div class="product-details">20
<p class="product-name">Item 1</p>21
<p class="product-price">Price: $100</p>22
</div>23
<button class="addToCartBtn">add to cart</button>24
</div>25
26
<div class="product">27
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">28
<div class="product-details">29
<p class="product-name">Item 2</p>30
<p class="product-price">Price: $100</p>31
</div>32
<button class="addToCartBtn">add to cart</button>33
</div>34
35
<div class="product">36
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">37
<div class="product-details">38
<p class="product-name">Item 3</p>39
<p class="product-price">Price: $100</p>40
</div>41
<button class="addToCartBtn">add to cart</button>42
</div>43
44
<div class="product">45
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">46
<div class="product-details">47
<p class="product-name">Item 4</p>48
<p class="product-price">Price: $100</p>49
</div>50
<button class="addToCartBtn">add to cart</button>51
</div>52
53
<div class="product">54
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">55
<div class="product-details">56
<p class="product-name">Item 5</p>57
<p class="product-price">Price: $100</p>58
</div>59
<button class="addToCartBtn">add to cart</button>60
</div>61
62
<div class="product">63
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">64
<div class="product-details">65
<p class="product-name">Item 6</p>66
<p class="product-price">Price: $100</p>67
</div>68
<button class="addToCartBtn">add to cart</button>69
</div>70
71
<div class="product">72
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">73
<div class="product-details">74
<p class="product-name">Item 7</p>75
<p class="product-price">Price: $100</p>76
</div>77
<button class="addToCartBtn">add to cart</button>78
</div>79
80
<div class="product">81
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">82
<div class="product-details">83
<p class="product-name">Item 8</p>84
<p class="product-price">Price: $100</p>85
</div>86
<button class="addToCartBtn">add to cart</button>87
</div>88
</div>89
90
<script src="app.js"></script>91
</body>92
–JS–
JavaScript
1
48
48
1
/* global variables */2
const itemsForSale = document.querySelector('#items')3
const cartQuantity = document.querySelector('#cart-quantity')4
const cartContent = document.querySelector('#cart-icon')5
const cartItems = document.querySelector('#cart-content');6
7
/* cart array */8
const cart = []9
10
11
/* -------------------------------------------------------- 12
functions -------------------------------------------------13
----------------------------------------------------------- */14
15
16
/* add to cart function */17
const addToCartBtn = document.querySelector('.addToCartBtn');18
19
addToCartBtn.onclick = function () {20
21
/* items in cart */22
const itemName = document.querySelector('.product-name').innerHTML;23
24
cart.push(itemName)25
console.log(cart)26
27
/* add item name to the cart */28
for(i = 0; i < cart.length; i++) {29
document.querySelector('#cart-items').textContent = `${cart[i]}`30
}31
32
/* quantity of items in cart */33
cartSum = cart.length34
cartQuantity.textContent = cartSum35
36
};37
38
39
40
/* show/hide item content */41
cartContent.addEventListener('click', function() {42
if(cartItems.style.display == 'none') {43
cartItems.style.display = 'flex';44
} else {45
cartItems.style.display = 'none';46
}47
});48
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Answer
This is because querySelector returns the first instance of the element in the DOM that corresponds to the class you are looking for. To fix this, first of all, I listened to the event of clicking all the buttons with querySelectorAll, and in the function itself, I searched for .product-name according to the parent closest to the button that has the class product
JavaScript
1
49
49
1
/* global variables */2
const itemsForSale = document.querySelector('#items')3
const cartQuantity = document.querySelector('#cart-quantity')4
const cartContent = document.querySelector('#cart-icon')5
const cartItems = document.querySelector('#cart-content');6
7
/* cart array */8
const cart = []9
10
11
/* -------------------------------------------------------- 12
functions -------------------------------------------------13
----------------------------------------------------------- */14
/* add to cart function */15
const addToCartBtn = document.querySelectorAll('.addToCartBtn');16
17
addToCartBtn.forEach(btn => {18
btn.onclick = function (e) {19
20
/* items in cart */21
const itemName = e.target.closest('.product').querySelector('.product-name').innerHTML;22
23
cart.push(itemName)24
console.log(cart)25
26
/* add item name to the cart */27
for(i = 0; i < cart.length; i++) {28
document.querySelector('#cart-items').textContent = `${cart[i]}`29
}30
31
/* quantity of items in cart */32
cartSum = cart.length33
cartQuantity.textContent = cartSum34
35
};36
})37
38
39
40
41
42
/* show/hide item content */43
cartContent.addEventListener('click', function() {44
if(cartItems.style.display == 'none') {45
cartItems.style.display = 'flex';46
} else {47
cartItems.style.display = 'none';48
}49
});JavaScript
1
91
91
1
<body>2
<div id="navbar">3
<p id="logo">eCommerce</p>4
<div id="cart">5
<img src="icons/shoppingcart.svg" alt="cart" id="cart-icon">6
<a href="#" id="cart-quantity"></a>7
</div>8
</div>9
10
<div id="cart-container">11
<div id="cart-content">12
<p id="cart-items">Your cart is empty</p>13
</div>14
</div>15
16
<div id="items">17
<div class="product">18
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">19
<div class="product-details">20
<p class="product-name">Item 1</p>21
<p class="product-price">Price: $100</p>22
</div>23
<button class="addToCartBtn">add to cart</button>24
</div>25
26
<div class="product">27
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">28
<div class="product-details">29
<p class="product-name">Item 2</p>30
<p class="product-price">Price: $100</p>31
</div>32
<button class="addToCartBtn">add to cart</button>33
</div>34
35
<div class="product">36
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">37
<div class="product-details">38
<p class="product-name">Item 3</p>39
<p class="product-price">Price: $100</p>40
</div>41
<button class="addToCartBtn">add to cart</button>42
</div>43
44
<div class="product">45
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">46
<div class="product-details">47
<p class="product-name">Item 4</p>48
<p class="product-price">Price: $100</p>49
</div>50
<button class="addToCartBtn">add to cart</button>51
</div>52
53
<div class="product">54
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">55
<div class="product-details">56
<p class="product-name">Item 5</p>57
<p class="product-price">Price: $100</p>58
</div>59
<button class="addToCartBtn">add to cart</button>60
</div>61
62
<div class="product">63
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">64
<div class="product-details">65
<p class="product-name">Item 6</p>66
<p class="product-price">Price: $100</p>67
</div>68
<button class="addToCartBtn">add to cart</button>69
</div>70
71
<div class="product">72
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">73
<div class="product-details">74
<p class="product-name">Item 7</p>75
<p class="product-price">Price: $100</p>76
</div>77
<button class="addToCartBtn">add to cart</button>78
</div>79
80
<div class="product">81
<img src="http://mattgreenhalgh.com/wp-content/uploads/2017/02/Placeholder_1080p.png" alt="product-img">82
<div class="product-details">83
<p class="product-name">Item 8</p>84
<p class="product-price">Price: $100</p>85
</div>86
<button class="addToCartBtn">add to cart</button>87
</div>88
</div>89
90
<script src="app.js"></script>91
</body>