complete shopify ajax cart solution with drawer and modal, adding and removing products - ugly AF

ajax-cart.js

const defaults = {
    cartModal: '.js-ajax-cart-modal', // classname
    cartModalContent: '.js-ajax-cart-modal-content', // classname
    cartModalClose: '.js-ajax-cart-modal-close', // classname
    cartDrawer: '.js-ajax-cart-drawer', // classname
    cartDrawerContent: '.js-ajax-cart-drawer-content', // classname
    cartDrawerClose: '.js-ajax-cart-drawer-close', // classname
    cartDrawerTrigger: '.js-ajax-cart-drawer-trigger', // classname
    cartOverlay: '.js-ajax-cart-overlay', // classname
    cartCounter: '.js-ajax-cart-counter', // classname
    addToCart: '.js-ajax-add-to-cart', // classname
    removeFromCart: '.js-ajax-remove-from-cart', //classname
    removeFromCartNoDot: 'js-ajax-remove-from-cart', //classname,
    checkoutButton: '.js-ajax-checkout-button',
};

const cartModal = document.querySelector(defaults.cartModal);
const cartModalContent = document.querySelector(defaults.cartModalContent);
const cartModalClose = document.querySelector(defaults.cartModalClose);
const cartDrawer = document.querySelector(defaults.cartDrawer);
const cartDrawerContent = document.querySelector(defaults.cartDrawerContent);
const cartDrawerClose = document.querySelector(defaults.cartDrawerClose);
const cartDrawerTrigger = document.querySelector(defaults.cartDrawerTrigger);
const cartOverlay = document.querySelector(defaults.cartOverlay);
const cartCounter = document.querySelector(defaults.cartCounter);
const addToCart = document.querySelectorAll(defaults.addToCart);
let removeFromCart = document.querySelectorAll(defaults.removeFromCart);
const checkoutButton = document.querySelector(defaults.checkoutButton);
const htmlSelector = document.documentElement;

for (let i = 0; i < addToCart.length; i++) {

    addToCart[i].addEventListener('click', function(event) {

        event.preventDefault();
        const formID = this.parentNode.getAttribute('id');
        console.log(formID);

        addProductToCart(formID);

    });

}

function addProductToCart(formID) {
    $.ajax({
        type: 'POST',
        url: '/cart/add.js',
        dataType: 'json',
        data: $('#' + formID)
            .serialize(),
        success: addToCartOk,
        error: addToCartFail,
    });
}

function fetchCart() {
    $.ajax({
        type: 'GET',
        url: '/cart.js',
        dataType: 'json',
        success: function(cart) {
            onCartUpdate(cart);

            if (cart.item_count === 0) {
                cartDrawerContent.innerHTML = 'Cart is empty';
                checkoutButton.classList.add('is-hidden');
            } else {
                renderCart(cart);
                checkoutButton.classList.remove('is-hidden');
            }

        },
    });
}

function changeItem(line, callback) {
    const quantity = 0;
    $.ajax({
        type: 'POST',
        url: '/cart/change.js',
        data: 'quantity=' + quantity + '&line=' + line,
        dataType: 'json',
        success: function(cart) {
            if ((typeof callback) === 'function') {
                callback(cart);
            } else {
                onCartUpdate(cart);
                fetchCart();
                removeProductFromCart();
            }
        },
    });
}

function onCartUpdate(cart) {
    console.log('items in the cart?', cart.item_count);
}

function addToCartOk(product) {
    cartModalContent.innerHTML = product.title + ' was added to the cart!';
    cartCounter.innerHTML = Number(cartCounter.innerHTML) + 1;
    openAddModal();
    openCartOverlay();
    fetchCart();
}

function removeProductFromCart() {
    cartCounter.innerHTML = Number(cartCounter.innerHTML) - 1;
}

function addToCartFail() {
    cartModalContent.innerHTML = 'The product you are trying to add is out of stock.';
    openAddModal();
    openCartOverlay();
}

function renderCart(cart) {

    console.log(cart);

    clearCartDrawer();

    cart.items.forEach(function(item, index) {

        //console.log(item.title);
        //console.log(item.image);
        //console.log(item.line_price);
        //console.log(item.quantity);

        const productTitle = '<div class="ajax-cart-item__title">' + item.title + '</div>';
        const productImage = '<img class="ajax-cart-item__image" src="' + item.image + '" >';
        const productPrice = '<div class="ajax-cart-item__price">' + item.line_price + '</div>';
        const productQuantity = '<div class="ajax-cart-item__quantity">' + item.quantity + '</div>';
        const productRemove = '<div class="ajax-cart-item__remove ' + defaults.removeFromCartNoDot + '"></div>';

        const concatProductInfo = '<div class="ajax-cart-item__single" data-line="' + Number(index + 1) + '">' + productTitle + productImage + productPrice + productQuantity + productRemove + '</div>';

        cartDrawerContent.innerHTML = cartDrawerContent.innerHTML + concatProductInfo;

    });

    // document.querySelectorAll('.js-ajax-remove-from-cart')
    //     .forEach((element) => {
    //         element.addEventListener('click', function() {
    //             const lineID = this.parentNode.getAttribute('data-line');
    //             console.log('aa');
    //         });
    //     });

    removeFromCart = document.querySelectorAll(defaults.removeFromCart);

    for (let i = 0; i < removeFromCart.length; i++) {
        removeFromCart[i].addEventListener('click', function() {
            const line = this.parentNode.getAttribute('data-line');
            console.log(line);
            changeItem(line);
        });
    }

}

function openCartDrawer() {
    cartDrawer.classList.add('is-open');
}

function closeCartDrawer() {
    cartDrawer.classList.remove('is-open');
}

function clearCartDrawer() {
    cartDrawerContent.innerHTML = '';
}

function openAddModal() {
    cartModal.classList.add('is-open');
}

function closeAddModal() {
    cartModal.classList.remove('is-open');
}

function openCartOverlay() {
    cartOverlay.classList.add('is-open');
    htmlSelector.classList.add('is-locked');
}

function closeCartOverlay() {
    cartOverlay.classList.remove('is-open');
    htmlSelector.classList.remove('is-locked');
}

cartModalClose.addEventListener('click', function() {
    closeAddModal();
    closeCartOverlay();
});

cartDrawerClose.addEventListener('click', function() {
    closeCartDrawer();
    closeCartOverlay();
});
// cart is empty stanje
cartOverlay.addEventListener('click', function() {
    closeAddModal();
    closeCartDrawer();
    closeCartOverlay();
});

cartDrawerTrigger.addEventListener('click', function(event) {
    event.preventDefault();
    //fetchCart();
    openCartDrawer();
    openCartOverlay();
});

document.addEventListener('DOMContentLoaded', function() {
    fetchCart();
});

ajax-cart.liquid

<!--ajax cart modal-->
<div class="ajax-cart__modal js-ajax-cart-modal">

    <div class="ajax-cart-modal">

        <!--ajax cart modal close-->
        <div class="ajax-cart-modal__close js-ajax-cart-modal-close">
            {% include 'icon-close' %}
        </div>
        <!--end ajax cart modal close-->

        <!--ajax cart modal content-->
        <div class="ajax-cart-modal__content js-ajax-cart-modal-content"></div>
        <!--end ajax cart modal content-->

    </div>

</div>
<!--end ajax cart modal-->

<!--ajax cart drawer-->
<div class="ajax-cart__drawer js-ajax-cart-drawer">

    <div class="ajax-cart-drawer">

        <!--ajax cart drawer close-->
        <div class="ajax-cart-drawer__close js-ajax-cart-drawer-close">
            {% include 'icon-close' %}
        </div>
        <!--end ajax cart drawer close-->

        <!--ajax cart drawer content-->
        <div class="ajax-cart-drawer__content js-ajax-cart-drawer-content"></div>
        <!--end ajax cart drawer content-->

        <!--ajax cart drawer buttons-->
        <div class="ajax-cart-drawer__buttons">

            <a href="/cart/" class="button button--black button--full-width js-button">
                <span>Go to cart</span>
            </a>

            <a href="/checkout/" class="button button--black button--full-width js-button js-ajax-checkout-button">
                <span>Proceed to checkout</span>
            </a>

        </div>
        <!--end ajax cart drawer buttons-->

    </div>

</div>
<!--end ajax cart drawer-->

<!--ajax cart overlay-->
<div class="ajax-cart__overlay js-ajax-cart-overlay"></div>
<!--end ajax cart overlay-->

ajax-cart.scss

.ajax-cart {

    &__modal {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        z-index: 40;
        max-width: 575px;
        background: getColor('white', 'default');
        border: 1px solid #e9e9e9;
        padding: 50px 65px;
        opacity: 0;
        visibility: hidden;
        will-change: opacity, visibility;

        &.is-open {
            opacity: 1;
            visibility: visible;
        }

    }

    &__overlay {
        position: fixed;
        z-index: 30;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        background-color: getColor('black-40', 'variations');
        opacity: 0;
        visibility: hidden;
        will-change: opacity, visibility;

        &.is-open {
            opacity: 1;
            visibility: visible;
        }

    }

    &__drawer {
        transition: getTransition();
        position: fixed;
        z-index: 40;
        right: -400px;
        top: 0;
        width: 400px;
        height: 100%;
        background: #f6f6f6;
        will-change: transform;
        border-left: 1px solid #e9e9e9;

        &.is-open {
            transform: translateX(-100%);
        }

    }

}

.ajax-cart-modal {
    position: relative;

    &__close {
        position: absolute;
        right: 10px;
        top: 10px;
    }

    &__content {
        padding: 20px;
    }

}

.ajax-cart-drawer {
    position: relative;
    height: 100%;

    &__close {
        position: absolute;
        right: 10px;
        top: 5px;
    }

    &__content {
        padding: 25px 25px 190px;
        height: 100%;
        overflow: hidden;
        overflow-y: scroll;
    }

    &__buttons {
        position: absolute;
        z-index: 10;
        left: 0;
        bottom: 0;
        width: 100%;
        height: 190px;
        background: #f6f6f6;
        padding: 20px;
        display: flex;
        flex-direction: column;
        justify-content: flex-end;

        .button {

            &:last-child {
                margin-top: auto;
            }

        }

    }

}

.ajax-cart-item {

    &__single {
        position: relative;
        margin-bottom: 20px;
        border-bottom: 2px solid red;
    }

    &__title {
    }

    &__image {
        width: 100px;
    }

    &__price {
    }

    &__quantity {
    }

    &__remove {
        @include center(vertical);
        right: 5px;
        width: 15px;
        height: 15px;
        background: url('data:image/svg+xml;base64,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') center no-repeat;
        background-size: cover;
        cursor: pointer;
    }

}

drawer-trigger-liquid

<!--cart-->
            <div class="header__cart">

                <a class="js-ajax-cart-drawer-trigger" href="/cart">
                    {% include 'icon-cart' %}
                    <span class="js-ajax-cart-counter">{{ cart.item_count }}</span>
                </a>

            </div>
            <!--end cart-->

single-product-form.liquid

<!--product form-->
            <form action="/cart/add" method="post" enctype="multipart/form-data" id="add-to-cart-{{ product.handle }}">

                <!--product variants-->
                {% unless product.has_only_default_variant %}

                    {% for option in product.options_with_values %}

                        <div class="single-product__option-wrapper js">

                            {% assign option-name = option.name | downcase %}

                            <div class="js-single-product-option-{{ option-name }} single-product-option-{{ option-name }}"
                                 id="SingleOptionSelector-{{ forloop.index0 }}">

                                {% for value in option.values %}

                                    {% assign product-handle = product.handle %}

                                    {% assign is_color = false %}

                                    {% assign stripped-value = value | split: ' ' | last | handle %}

                                    {% if option-name contains 'color' or option-name contains 'colour' %}

                                        {% assign is_color = true %}

                                    {% endif %}

                                    {% if is_color %}

                                        <input type="radio" name="{{ option-name }}-{{ product-handle }}"
                                               class="single-option-selector single-product-option-{{ option-name }}__input js-radio-button"
                                               data-single-option-selector
                                               data-index="option{{ option.position }}"
                                               value="{{ value | escape }}"
                                               data-color="{{ value | handleize }}"
                                               {% if option.selected_value == value %}checked="checked"{% endif %}
                                               id="variant_{{ option-name }}-{{ product-handle }}-{{ forloop.index0 }}"/>

                                        <label for="variant_{{ option-name }}-{{ product-handle }}-{{ forloop.index0 }}"
                                               class="single-product-option-{{ option-name }}__label {% if stripped-value contains 'white' %}single-product-option-{{ option-name }}__label--white{% endif %}"
                                               style="background-color: {{ stripped-value }};">

                                            {% include 'icon-check' %}

                                        </label>

                                    {% else %}

                                        <input type="radio" name="{{ option-name }}-{{ product-handle }}"
                                               class="single-option-selector single-product-option-{{ option-name }}__input"
                                               data-single-option-selector
                                               data-index="option{{ option.position }}"
                                               value="{{ value | escape }}"
                                               {% if option.selected_value == value %}checked="checked"{% endif %}
                                               id="variant_{{ option-name }}-{{ product-handle }}-{{ forloop.index0 }}"/>

                                        <label for="variant_{{ option-name }}-{{ product-handle }}-{{ forloop.index0 }}"
                                               class="single-product-option-{{ option-name }}__label">{{ value }}</label>

                                    {% endif %}

                                {% endfor %}

                            </div>

                        </div>

                    {% endfor %}

                {% endunless %}

                <select name="id" class="no-js" data-product-select>
                    {% for variant in product.variants %}
                        <option
                                {% if variant == current_variant %}selected="selected"{% endif %}
                                {% unless variant.available %}disabled="disabled"{% endunless %}
                                value="{{ variant.id }}">
                            {{ variant.title }}
                        </option>
                    {% endfor %}
                </select>
                <!--end product variants-->

                <!--product add to cart-->
                <button
                        class="single-product__add-to-cart u-b6 js-ajax-add-to-cart"
                        type="submit"
                        name="add"
                        data-add-to-cart
                        {% unless current_variant.available %}disabled="disabled"{% endunless %}>

                    <span data-add-to-cart-text>
                        {% if current_variant.available %}
                            {{ 'products.product.add_to_cart' | t }}
                        {% else %}
                            {{ 'products.product.sold_out' | t }}
                        {% endif %}
                    </span>

                </button>
                <!--end product add to cart-->

            </form>
            <!--end product form-->