When running a Shopify store, creating a seamless and intuitive shopping experience is key to increasing conversions and customer satisfaction. One often-overlooked feature is the quantity selector—a simple UI element that allows shoppers to choose how many of a particular item they want to purchase before adding it to their cart.
In this post, we’ll explore why a quantity selector is important, where it makes the most sense to use it, and how it can impact your store’s performance.
Why Add a Quantity Selector?
A quantity selector gives customers more control over their purchase. Whether they want to buy multiples of a product for themselves or are purchasing items in bulk, this small feature can make the process quicker and more intuitive. It’s especially important for products that are:
- Frequently bought in multiples (e.g., food items, party supplies)
- Part of bundles or kits
- Offered at discounted rates for bulk purchases
Adding a quantity selector ensures your store looks professional and functions efficiently for customers with different buying needs.
How to Add a Quantity Selector to Your Shopify Theme
<product-detail-quantities class="prd-DetailQuantities_Rows">
<fieldset class="prd-DetailQuantities_Row" data-product-detail-quantities-el="option" data-name="menge">
<legend class="prd-DetailQuantities_Legend">
Menge:
<span class="prd-DetailQuantities_Indicator" data-product-detail-quantities-el="indicator">1</span>
</legend>
<product-detail-progress-bar class="prd-Detail_ProgressBar" aria-hidden="false">
<ul class="prd-ProgressBar" data-quantity="1" data-product-detail-progress-bar-el="list">
<li class="prd-ProgressBar_Item" data-product-detail-progress-bar-el="item" data-quantity="1" aria-current="true"></li>
<li class="prd-ProgressBar_Item" data-product-detail-progress-bar-el="item" data-quantity="2" aria-current="false">
<div class="prd-ProgressBarItem_TextContainer">
<span class="prd-ProgressBarItem_Text prd-ProgressBarItem_Text-active">
🤑 du sparst
<span data-product-progress-discount-amount>€0,00
</span>
</span>
<span class="prd-ProgressBarItem_Text prd-ProgressBarItem_Text-inactive">
Spare
<span data-product-progress-discount-amount>€0,00</span>
</span>
</div>
</li>
<li class="prd-ProgressBar_Item" data-product-detail-progress-bar-el="item" data-quantity="3" aria-current="false">
<div class="prd-ProgressBarItem_TextContainer">
<span class="prd-ProgressBarItem_Text prd-ProgressBarItem_Text-active">
🤑 du sparst
<span data-product-progress-discount-amount>€0,00
</span>
</span>
<span class="prd-ProgressBarItem_Text prd-ProgressBarItem_Text-inactive">
Spare
<span data-product-progress-discount-amount>€0,00</span>
</span>
</div>
</li>
</ul>
</product-detail-progress-bar>
<div class="prd-DetailQuantities_Options">
<div class="prd-DetailQuantities_Option prd-DetailQuantities_Option-radio" data-product-quantity-option-radio>
<input class="prd-DetailQuantities_Input"
type="radio"
id="menge-1"
name="menge"
value="1"
data-units="1"
data-discount="0"
data-default-discount="0"
data-product-detail-quantities-el="option-choice"
data-hide-recharge="false"
checked>
<label class="prd-DetailQuantities_Button" for="menge-1">
<span class="prd-DetailQuantities_Units">1 Stück</span>
</label>
</div>
<div class="prd-DetailQuantities_Option prd-DetailQuantities_Option-radio" data-product-quantity-option-radio>
<input class="prd-DetailQuantities_Input"
type="radio"
id="menge-2"
name="menge"
value="2"
data-units=""
data-discount="0.0"
data-default-discount="0.0"
data-product-detail-quantities-el="option-choice"
data-hide-recharge="false">
<label class="prd-DetailQuantities_Button" for="menge-2">
<span class="prd-DetailQuantities_Units"> Stück</span>
<div class="prd-DetailQuantities_Discount" aria-hidden="false">
<span class="prd-DetailQuantities_DiscountText">Spare</span>
<span class="prd-DetailQuantities_DiscountPercentage" data-product-quantity-discount-percentage>
%
</span>
</div>
</label>
</div>
<div class="prd-DetailQuantities_Option prd-DetailQuantities_Option-radio" data-product-quantity-option-radio>
<input class="prd-DetailQuantities_Input"
type="radio"
id="menge-3"
name="menge"
value="3"
data-units=""
data-discount="0.0"
data-default-discount="0.0"
data-product-detail-quantities-el="option-choice"
data-hide-recharge="false">
<label class="prd-DetailQuantities_Button" for="menge-3">
<span class="prd-DetailQuantities_Units"> Stück</span>
<div class="prd-DetailQuantities_Discount" aria-hidden="false">
<span class="prd-DetailQuantities_DiscountText">Spare</span>
<span class="prd-DetailQuantities_DiscountPercentage" data-product-quantity-discount-percentage>
%
</span>
</div>
</label>
</div>
</div>
</fieldset>
</product-detail-quantities>
<style>
.prd-DetailQuantities_Rows {
display: block;
margin-bottom: 20px;
margin-top: 15px
}
.prd-DetailQuantities_Row {
border: 0;
margin: 0;
padding: 0
}
.prd-DetailQuantities_RowTop {
align-items: center;
display: flex;
justify-content: space-between
}
.prd-DetailQuantities_Legend {
grid-gap: 5px;
align-items: baseline;
color: #000;
display: flex;
gap: 5px;
line-height: 1;
padding-left: 0;
padding-right: 0
}
.prd-DetailQuantities_Legend .prd-DetailQuantities_Indicator,.prd-DetailQuantities_Legend .prd-DetailQuantities_Title {
color: var(--text-color);
display: block;
font-family: Gordita Bold;
font-size: 14px
}
.prd-DetailQuantities_Options {
grid-gap: 10px;
align-items: center;
display: grid;
gap: 10px;
grid-template-columns: repeat(3,1fr);
margin-top: 15px;
position: relative
}
.prd-DetailQuantities_Option {
height: 100%
}
.prd-DetailQuantities_Option input {
display: none
}
.prd-DetailQuantities_Button {
grid-gap: 2px;
align-items: center;
background-color: #fff;
border: 1px solid #ddd;
border-radius: 50px;
cursor: pointer;
display: flex;
flex-direction: column;
font-size: .8em;
gap: 2px;
height: 100%;
justify-content: center;
min-width: 60px;
padding: 10px;
position: relative;
text-align: center;
transition: border-color .3s ease
}
.prd-DetailQuantities_Button:hover {
border-color: #1c1c1c
}
.prd-DetailQuantities_Button-soldOut {
background-color: #f4f4f5;
border: 1px solid #d8d8d8
}
.prd-DetailQuantities_Units {
display: block;
font-size: 11px;
line-height: 1;
text-transform: capitalize
}
.prd-DetailQuantities_Discount {
grid-gap: 5px;
display: flex;
gap: 5px;
line-height: 1
}
.prd-DetailQuantities_Discount[aria-hidden=true] {
display: none
}
.prd-DetailQuantities_Discount-reversed {
flex-direction: row-reverse
}
.prd-DetailQuantities_DiscountPercentage,.prd-DetailQuantities_DiscountText {
color: #008B13;
display: flex;
font-size: 11px;
line-height: 1;
text-transform: capitalize
}
.prd-DetailQuantities_Input:checked+.prd-DetailQuantities_Button {
border-color: #1c1c1c
}
.prd-DetailQuantities_Input:checked+.prd-DetailQuantities_Button:before {
background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg width='18' height='18' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Crect width='18' height='18' rx='9' fill='%23000'/%3E%3Cpath d='M7.333 12.5 4 9.521 5.167 8.48l2.166 1.936 5.5-4.915L14 6.543 7.333 12.5Z' fill='%23fff'/%3E%3C/svg%3E");
content: "";
height: 18px;
position: absolute;
right: 0;
top: -8px;
width: 18px;
z-index: 1
}
.prd-Detail_ProgressBar {
display: block;
margin-bottom: 15px;
margin-top: 15px
}
.prd-Detail_ProgressBar[aria-hidden=true] {
display: none
}
.prd-ProgressBar {
grid-gap: 10px;
align-items: center;
background-color: #e8e8e8;
border-radius: 5px;
display: grid;
gap: 10px;
grid-template-columns: repeat(3,1fr);
height: 4px;
list-style: none;
margin-top: 15px;
position: relative
}
.prd-ProgressBar[data-quantity="1"]:after {
width: calc(33.33333% - 8px)
}
.prd-ProgressBar[data-quantity="2"]:after {
width: calc(66.66667% - 5px)
}
.prd-ProgressBar[data-quantity="3"]:after {
width: 100%
}
.prd-ProgressBar:after {
background-color: #008B12;
border-radius: 5px;
content: "";
height: 4px;
left: 0;
position: absolute;
top: 0;
transition: inline-size .1s ease-in-out
}
.prd-ProgressBar_Item {
position: relative
}
.prd-ProgressBar_Item:after,.prd-ProgressBar_Item:before {
content: "";
left: 50%;
opacity: 0;
position: absolute;
transition: opacity .2s ease-in-out
}
.prd-ProgressBar_Item:before {
border-bottom: 12px solid #008B13;
bottom: 0
}
.prd-ProgressBar_Item:after,.prd-ProgressBar_Item:before {
border-left: 6px solid transparent;
border-right: 6px solid transparent;
transform: translate(-50%)
}
.prd-ProgressBar_Item:after {
border-top: 12px solid #e8e8e8;
top: 0
}
.prd-ProgressBar_Item[data-quantity="2"]:after,.prd-ProgressBar_Item[data-quantity="2"]:before,.prd-ProgressBar_Item[data-quantity="3"]:after,.prd-ProgressBar_Item[data-quantity="3"]:before {
opacity: 0
}
.prd-ProgressBar_Item[data-quantity="2"][aria-current=true],.prd-ProgressBar_Item[data-quantity="2"][aria-current=true]:before,.prd-ProgressBar_Item[data-quantity="3"][aria-current=true],.prd-ProgressBar_Item[data-quantity="3"][aria-current=true]:before {
opacity: 1
}
.prd-ProgressBar_Item[data-quantity="2"][aria-current=true]:after,.prd-ProgressBar_Item[data-quantity="3"][aria-current=true]:after {
opacity: 0
}
[data-quantity="1"] .prd-ProgressBar_Item[data-quantity="2"],[data-quantity="1"] .prd-ProgressBar_Item[data-quantity="3"] {
opacity: 1
}
[data-quantity="1"] .prd-ProgressBar_Item[data-quantity="2"]:before,[data-quantity="1"] .prd-ProgressBar_Item[data-quantity="3"]:before {
opacity: 0
}
[data-quantity="1"] .prd-ProgressBar_Item[data-quantity="2"]:after,[data-quantity="1"] .prd-ProgressBar_Item[data-quantity="3"]:after,[data-quantity="2"] .prd-ProgressBar_Item[data-quantity="2"][data-quantity="3"]:after,[data-quantity="2"] .prd-ProgressBar_Item[data-quantity="3"][data-quantity="3"]:after {
opacity: 1
}
[data-quantity="3"] .prd-ProgressBar_Item[data-quantity="2"][data-quantity="2"],[data-quantity="3"] .prd-ProgressBar_Item[data-quantity="3"][data-quantity="2"] {
opacity: 0
}
.prd-ProgressBarItem_TextContainer {
bottom: 32px;
left: 0;
opacity: 0;
position: absolute;
transition: opacity .2s ease-in-out;
width: 100%
}
.prd-ProgressBarItem_TextContainer .prd-ProgressBarItem_Text {
display: block;
font-size: 10px;
height: 0;
left: 50%;
opacity: 0;
position: absolute;
text-align: center;
top: 50%;
transform: translate(-50%,-50%);
width: -webkit-max-content;
width: -moz-max-content;
width: max-content
}
.prd-ProgressBarItem_TextContainer .prd-ProgressBarItem_Text-inactive,[aria-current=true] .prd-ProgressBarItem_TextContainer,[aria-current=true] .prd-ProgressBarItem_TextContainer .prd-ProgressBarItem_Text-active {
opacity: 1
}
[aria-current=true] .prd-ProgressBarItem_TextContainer .prd-ProgressBarItem_Text-inactive {
opacity: 0
}
[aria-current=false] .prd-ProgressBarItem_TextContainer {
opacity: .5
}
</style>
<script>
// Option 1: Using DOMContentLoaded
document.addEventListener('DOMContentLoaded', () => {
class ProductDetailQuantities extends HTMLElement {
constructor() {
super();
this.init();
}
init() {
const inputs = this.querySelectorAll('[data-product-detail-quantities-el="option-choice"]');
const indicator = this.querySelector('[data-product-detail-quantities-el="indicator"]');
const progressItems = this.querySelectorAll('[data-product-detail-progress-bar-el="item"]');
const progressBar = this.querySelector('[data-product-detail-progress-bar-el="list"]');
const form = document.querySelector('form[action="/cart/add"]');
let quantityInput = form.querySelector('input[name="quantity"]');
if (!quantityInput) {
quantityInput = document.createElement('input');
quantityInput.type = 'hidden';
quantityInput.name = 'quantity';
quantityInput.value = '1';
form.appendChild(quantityInput);
}
inputs.forEach(input => {
input.addEventListener('change', () => {
if (input.checked) {
if (indicator) {
indicator.textContent = input.dataset.units;
}
if (progressBar) {
progressBar.setAttribute('data-quantity', input.value);
}
progressItems.forEach(item => {
const isCurrentItem = item.dataset.quantity === input.value;
item.setAttribute('aria-current', isCurrentItem);
});
if (quantityInput) {
quantityInput.value = input.dataset.units;
quantityInput.dispatchEvent(new Event('change', { bubbles: true }));
}
document.querySelectorAll('form[action="/cart/add"]').forEach(cartForm => {
let formQuantityInput = cartForm.querySelector('input[name="quantity"]');
if (!formQuantityInput) {
formQuantityInput = document.createElement('input');
formQuantityInput.type = 'hidden';
formQuantityInput.name = 'quantity';
cartForm.appendChild(formQuantityInput);
}
formQuantityInput.value = input.dataset.units;
formQuantityInput.dispatchEvent(new Event('change', { bubbles: true }));
});
}
});
});
}
}
customElements.define('product-detail-quantities', ProductDetailQuantities);
});
</script>
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