practice-time-shopping-list-Affonso-Kopmann/scripts/app.js

document.addEventListener('DOMContentLoaded', function() {

    const list = [];

    const form = document.querySelector(".shopping-form");
    const itemInput = document.querySelector(".shopping-form-item-input");
    const quantityInput = document.querySelector(".shopping-form-quantity-input");
    const incrementButton = document.querySelector(".shopping-form-increment-button");
    const decrementButton = document.querySelector(".shopping-form-decrement-button");
    const items = document.querySelector(".shopping-items");

    incrementButton.addEventListener("click", incrementQuantity);
    decrementButton.addEventListener("click", decrementQuantity);
    form.addEventListener("submit", addItemToList);

    function incrementQuantity() {
        const currentValue = Number(quantityInput.value);
        const newValue = currentValue + 1;
        quantityInput.value = newValue;
    }

    function decrementQuantity() {
        const currentValue = Number(quantityInput.value);
        const newValue = currentValue - 1;
         if (newValue > 0) {
             quantityInput.value = newValue;
         }
    }

    function addItemToList(event){
        event.preventDefault();

        const itemName = event.target["item-name"].value;
        const itemQuantity = event.target["item-quantity"].value;

            if (itemName != "") {
                const item = {
                    name: itemName,
                    quantity: itemQuantity,
                };

                list.push(item);
                renderListItems();
                resetInputs();
            }            
    }

    function renderListItems() {
        let itemsStructure = "";

        list.forEach(function(item) {
            itemsStructure += `
                <li class="shopping-item">
                <span>${item.name}</span>
                <span>${item.quantity}</span>
                </li>
            `;
        });

        items.innerHTML = itemsStructure ;
    }

    function resetInputs(){
        itemInput.value = "";
        quantityInput.value = 1;
    
    }
});