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3-Steps to Higher Amount Selectors on Your Shopify Theme

There are a couple of choices in the case of e-commerce amount selectors, however an interactive factor appears to be probably 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 area? Possibly you’ve acquired 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 downside: your Shopify theme has an AJAX cart and you don’t have any thought the best way to add performance for dynamically loaded components.

This walkthrough will present you the best way 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 will be useful to share these steps with you! Afterall, sharing is caring. 

Observe: You’ll have to have fundamental information 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 modifying any code. Altering a reside theme will be very dangerous when you’re not completely certain what you’re doing and/or making greater modifications (like this one) that span a number of recordsdata. Working in a replica theme will will let you confirm and check your modifications 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 factor liable for updating the amount of a given line merchandise. 

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

<button kind=’button’ worth=’-‘ class=’qtyminus’> – </button>
<enter kind=”quantity” identify=”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 area 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 can be used once more later within the Javascript to find out how the amount ought to be modified. 

From right here, you might add in a little bit of Javascript to alter 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 just 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 modifying 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 would look one thing like this.

    var selectors = {
      type: ‘type.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 strains I’ve added. *Relying on what class you’ve given your new buttons, this may occasionally look barely totally 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 strains I’ve added to hear 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 = $‘enter[type=”number”]’);
        var id = $enter.closest(selectors.merchandise).attr(information.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 enhance 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: Take a look at your code and make it mini 

That is going to get wordy, so bear with me. Remark out every little thing 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 gives you 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 typically end up in want of this sort of Shopify-related improvement, we’re right here to assist! Mobile1st is vital for purchasers identical to you; the final word optimization associate that may constantly enhance your conversion charges. Simply sit again and let our staff of licensed Shopify Consultants provide the high-converting theme of your goals.

Mobile1st is a frontrunner in advertising and marketing expertise and website optimization options. Greater than prioritizing and executing business main CRO practices, we do what makes the cash; optimizing our Consumer’s digital commerce product towards constant monetary progress and ROI. All achieved by means of excellence in Lean UX, Analytics, Analysis, Experimentation and Growth.
Contact Mobile1st Consultants Now!

Alex Ortiz
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