practice-time-shopping-list/main.js

document.addEventListener("DOMContentLoaded", () => {
  const list = [];

  const form = document.querySelector(".shopping-form");
  const inputItem = document.querySelector(".shopping-form-item-input");

  const quantityInput = document.querySelector(".shopping-form-quantity-input");
  const incrementBtn = document.querySelector(
    ".shopping-form-increment-button"
  );
  const decrementBtn = document.querySelector(
    ".shopping-form-decrement-button"
  );

  const items = document.querySelector(".shopping-items");

  incrementBtn.addEventListener("click", increment);
  decrementBtn.addEventListener("click", decrement);
  form.addEventListener("submit", addItemToList);

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

    quantityInput.value = newValue;
  }

  function decrement() {
    const currentValue = Number(quantityInput.value);
    const newValue = currentValue - 1;
    if (newValue > 0) {
      quantityInput.value = newValue;
    }
  }
  function addItemToList(e) {
    e.preventDefault();
    const itemName = e.target["item-name"].value; /* name do input */
    const itemQuantity = e.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() {
    inputItem.value = "";
    quantityInput.value = 1;
  }
});