js__vue_mastery/main.js

const DISABLED = "disabledButton";

const tpl = `    <div class="product">
      <div class="product-image">
        <a :href="link">
          <!-- bind the src attribute to the "image" property -->
          <img
            v-bind:src="image"
            :alt="description" :title="description"
          /><!-- :attr is shortcut for v-bind:attr -->
        </a>
      </div>
      <div class="product-info">
        <h1 v-cloak>{{ title }}</h1>

        <h2>Available?</h2>
        <p v-cloak v-show="inStock">In stock</p>
        <p v-cloak v-show="!inStock">Out of stock</p>
        <p>Shipping: {{ shipping }}</p>
        <h2>Details</h2>
        <ul>
          <li v-for="detail in details">{{ detail }}</li>
        </ul>

        <h2>Colors</h2>
        <ul>
          <li v-for="(variant, index) in variants"
              v-bind:key="variant.variantId"
              @mouseover="updateImage(index)"
              class="color-box"
              :style="{ backgroundColor: variant.variantColor }"
          /><!-- @ est le raccourci de v-on: -->
        </ul>

        <h2>Sizes</h2>
        <ul>
          <li v-for="size in sizes" :key="size">{{ size }}</li>
        </ul>

        <button v-on:click="addToCart"
                :disabled="!inStock"
                :class="{ disabledButton: !inStock }"
        >Add to cart</button>
        <div class="cart">
          <p>Cart({{cart}})</p>
        </div>
      </div>
    </div>
`;

Vue.component("product", {
    props: {
      isPremium: {
          type: Boolean,
          required: true,
      }
    },
    template: tpl,
    // Computer properties are cached until dependencies change.
    // => cheaper than methods.
    computed: {
        image() {
            const image = this.variants[this.selectedVariant].variantImage;
            return image;
        },
        inStock() {
            return this.variants[this.selectedVariant].variantQuantity > 0;
        },
        shipping() {
            if (this.isPremium) {
                return "Free";
            }
            return "2.99 €";
        },
        title() {
            return [this.brand, this.product].join(' ');
        }
    },
    data() {
        return {
            brand: "Vue Mastery",
            cart: 0,
            description: "Chaussettes montantes",
            details: [
                "80% cotton",
                "20% polyester",
                "Gender-neutral",
            ],
            inventory: 15,
            link: "https://www.google.com/search?q=vuejs+socks",
            product: "Socks",
            selectedVariant: 0,
            sizes: [34, 36, 38, 40, 42, 44, 46],
            variants: [
                {
                    variantId: 2234,
                    variantColor: "green",
                    variantImage: "./assets/img/vmSocks-green-onWhite.jpg",
                    variantQuantity: 10,
                },
                {
                    variantId: 2235,
                    variantColor: "blue",
                    variantImage: "./assets/img/vmSocks-blue-onWhite.png",
                    variantQuantity: 0,
                },
            ]
        }
    },
    methods: {
        addToCart(mouseEvent) {
            if (this.variants[this.selectedVariant].variantQuantity < 0) {
                this.variants[this.selectedVariant].variantQuantity = 0;
                return;
            }
            this.variants[this.selectedVariant].variantQuantity--;
            this.cart++;
            if (this.variants[this.selectedVariant].variantQuantity <= 0) {
                this.variants[this.selectedVariant].variantQuantity = 0;
            }
        },
        updateImage(index) {
            this.selectedVariant = index;
        }
    },
});

const app = new Vue({
    el: "#app",
    data: {
        isPremium: false,
    }
});