3-Steps to Higher Amount Selectors on Your Shopify Theme
8 mins read

3-Steps to Higher Amount Selectors on Your Shopify Theme

There are a couple of choices in terms of e-commerce amount selectors, however an interactive aspect appears to be essentially the most user-friendly for B2C retail websites. 

A great “interactive” amount selector usually implies that the consumer doesn’t want to drag up a menu or use their keyboard, they’ll simply faucet or click on proper on the display screen. Cool, proper?

So what in case your Shopify theme simply has the default HTML enter subject? Possibly you’ve received one thing that appears a bit like this (an especially small contact space for cellular gadgets)… 

However you’re a wise cookie that’s aiming for one thing extra intuitive (and aesthetically pleasing), like this…

Only one drawback: your Shopify theme has an AJAX cart and you haven’t any thought methods to add performance for dynamically loaded components.

This walkthrough will present you methods to fully combine new amount selector buttons and enhance your default Shopify retailer. Mobile1st was simply implementing this variation for a shopper utilizing the Streamline theme, and we thought it could be useful to share these steps with you! Afterall, sharing is caring. 

Word: You’ll must have fundamental data of HTML & CSS; and an understanding of how javascript works to set off a amount change when a consumer clicks in your new buttons.


I like to recommend making a duplicate of your reside theme earlier than enhancing any code. Altering a reside theme may be very dangerous in case you’re not fully certain what you’re doing and/or making greater adjustments (like this one) that span a number of information. Working in a replica theme will permit you to confirm and take a look at your adjustments in preview mode earlier than going reside. 

STEP 1: Add buttons to the amount selector

To set this up, you’ll go into the cart template or cart-drawer template and seek for “amount” to seek out the enter aspect chargeable for updating the amount of a given line merchandise. 

We’re then going so as to add a button above and under the amount enter; these might be used to extend/lower the worth.

<button kind=’button’ worth=’-‘ class=’qtyminus’> – </button>
<enter kind=”quantity” title=”updates[]” id=”cart_updates_{{ merchandise.key }}” class=”cart__quantity” worth=”{{ merchandise.amount }}” min=”0″ data-id=”{{ merchandise.key }}” data-cart-item-input-quantity>
<button kind=’button’ worth=’+’ class=’qtyplus’> + </button>

The enter subject was left as is, however you’ll wish to take note of the button’s courses. For this tutorial, I’ve chosen the courses qtyminus and qtyplus which might be used once more later within the Javascript to find out how the amount ought to be modified. 

From right here, you would add in a little bit of Javascript to vary the amount on click on (normally). But when your cart makes use of AJAX to dynamically change the contents of the cart every time it’s up to date – you’ll see that your set off solely works on preliminary web page load. 

It’s because the AJAX is simply updating the web page content material, and never reinitializing your occasion handler. So your fancy new buttons are being destroyed and reloaded, however your occasion handler isn’t being reattached.

STEP 2: Inform your new buttons what to do

That is the place it will get enjoyable (or messy… I’m not right here to guage). 

Find a file known as theme.js and seek for one thing like “cart” or “AjaxCart” to seek out the cart’s constructor. In the event you’re enhancing the Streamline theme, that is known as “theme.AjaxCart”.

STEP 2a: Outline these variables

Search for the handler’s variable object, mostly named “selectors”. That is the place you’ll outline your “+” and “-” buttons. It is going to look one thing like this.

    var selectors = {
      kind: ‘kind.cart’,
      cartCount: ‘.cart-link__count’,
      updateBtn: ‘.update-cart’,
      itemList: ‘[data-cart-item-list]’,
      merchandise: ‘[data-cart-item]’,
      itemId: ‘[data-cart-item-id]’,
      itemHref: ‘[data-cart-item-href]’,
      itemBackgroundImage: ‘[data-cart-item-background-image]’,
      itemTitle: ‘[data-cart-item-title]’,
      itemVariantTitle: ‘[data-cart-item-variant-title]’,
      itemPropertyList: ‘[data-cart-item-property-list]’,
      itemProperty: ‘[data-cart-item-property]’,
      itemDiscountList: ‘[data-cart-item-discount-list]’,
      itemDiscount: ‘[data-cart-item-discount]’,
      itemDiscountTitle: ‘[data-cart-item-discount-title]’,
      itemDiscountAmount: ‘[data-cart-item-discount-amount]’,
      itemLabelQuantity: ‘[data-cart-item-label-quantity]’,
      itemInputQuantity: ‘[data-cart-item-input-quantity]’,

      itemDelete: ‘[data-cart-item-delete]’,
      itemPriceContainer: ‘[data-cart-item-price-container]’,
      itemLinePriceContainer: ‘[data-cart-item-line-price-container]’,
      itemUnitPrice: ‘[data-cart-item-unit-price]’,
      itemMessage: ‘[data-item-message]’,
      itemSubscriptionName: ‘[data-cart-item-subscription-name]’,
      cartDiscountContainer: ‘[data-cart-discount-container]’,
      cartDiscountContent: ‘[data-cart-discount-content]’,
      cartDiscount: ‘[data-cart-discount]’,
      cartDiscountTitle: ‘[data-cart-discount-title]’,
      cartDiscountAmount: ‘[data-cart-discount-amount]’,
      cartNoteContainer: ‘[data-cart-note-container]’,
      cartNoteInput: ‘[data-cart-note]’,
      cartMessage: ‘[data-cart-message]’,
      cartSubtotal: ‘[data-cart-subtotal]’,
      cartSubmit: ‘[data-cart-submit]’

Highlighted in orange are the traces I’ve added. *Relying on what class you’ve given your new buttons, this may occasionally look barely completely different. 

STEP 2b: Add occasion listeners

Additional down, there ought to be a prototype perform the place the occasion listeners are being outlined. We’ll be making fairly a couple of updates right here. In orange are the traces I’ve added to pay attention for clicks on each of the buttons, and in blue is what I swapped from ‘enter’ to ‘change’.

    this.$container.on(‘click on’, selectors.itemInputMinus, this._updateQuantity);
        this.$container.on(‘click on’, selectors.itemInputPlus, this._updateQuantity);
        this.$container.on(‘click on’, selectors.itemDelete, this._onItemDelete.bind(this));
        this.$container.on(‘change‘, selectors.itemInput Amount, $.debounce
(500, this._onItemQuantityChange.bind(this)));
        this.$container.on(‘blur’, selectors.itemInputQuantity, this._onItemQuantityEmptyBlur.bind(this));
        this.$container.on(‘focus’, selectors.itemInputQuantity, this._highlightText);

STEP 2c: Flip button clicks into amount updates

Find the perform known as  “_onItemQuantityChange”, and place this subsequent perform simply above it (to maintain issues organized). 

      _updateQuantity: perform(evt){
        var $button = $(evt.goal).closest(‘button’);
        var $enter = $button.father or mother().discover(‘enter[type=”number”]’);
        var id = $enter.closest(selectors.merchandise).attr(knowledge.itemId);
        var amount = $enter.val();
        if ($button.hasClass(‘qtyplus’)) {
              amount = parseInt($enter.val()) + 1;
        } else {
          amount = parseInt($enter.val()) – 1;
        if (amount == 0) {
          var response = verify(theme.strings.cartConfirmDelete);
          if (response === false) {
        theme.cart.changeItem(id, amount);

This perform takes the occasion that simply occurred (ie. the button click on) and determines whether or not or not it ought to improve or lower the enter worth. As soon as the brand new amount has been calculated, the perform calls “changeItem” – which has already been outlined within the theme’s javascript – to set off the AJAX replace on the cart. 

And since we’ve added this to the cart’s constructor, this code will proceed to work each time the content material is loaded. 

STEP 3: Check your code and make it mini 

That is going to get wordy, so bear with me. Remark out every part in theme.min.js and paste all the contents from theme.js (briefly) – simply to keep away from minifying code that doesn’t truly work. When you’ve verified that your code is operating as meant, head over to a Javascript minifier website and paste the code you simply copied. This provides you with a minified model of the theme.js file. Minified javascript dramatically improves website velocity and accessibility (aka – a greater consumer expertise). Now you’ll return to theme.min.js, take away the unminified content material, and paste in your new minified theme code. 

Et voilà! You now have a user-friendly, aesthetically pleasing amount selector that’s fully built-in into your Shopify theme. No duct tape required.

If this tutorial was a bit out of your depth, otherwise you usually end up in want of this sort of Shopify-related improvement, we’re right here to assist! Mobile1st is essential for purchasers identical to you; the final word optimization associate that can repeatedly enhance your conversion charges. Simply sit again and let our group of licensed Shopify Specialists provide the high-converting theme of your desires.

Mobile1st is a pacesetter in advertising expertise and website optimization options. Greater than prioritizing and executing trade main CRO practices, we do what makes the cash; optimizing our Consumer’s digital commerce product towards constant monetary development and ROI. All achieved by means of excellence in Lean UX, Analytics, Analysis, Experimentation and Improvement.
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Alex Ortiz
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