In my vue components I have two array called categories and product which is coming from the DB. The categories array is an array of object like its have id, type, name, value and products array also have id , type, name, parent_id, value. parent_id in products is the id of categories . I want to show the products based on categories in select option. like If categoris type A then products will be B,C,D or If categoris type B then products will be X,Y,Z. How can i do that?

CodePudding user response：

Step 1: Create an html template with select option

 <template>
  <div id="app">
    <div class="row">
      <label>Category </label>
      <select @change="onChangeCategory" v-model="selectedCategory">
        <option value="">Select Category</option>
        <option
          v-for="(category, index) in categories"
          :key="index"
          :value="category">
          {{ category.name }}
        </option>
      </select>
    </div>
    <div class="row">
      <label>Product </label>
      <select v-model="selectedProduct">
        <option value="">Select Product</option>
        <option
          v-for="(product, index) in filteredProducts"
          :key="index"
          :value="product">
          {{ product.name }}
        </option>
      </select>
    </div>
    <p v-if="selectedCategory">Selected Category {{ selectedCategory }}</p>
    <p v-if="selectedProduct">Selected Product {{ selectedProduct }}</p>
  </div>
</template>

Step 2: Create an model data

data() {
  return {
    selectedCategory: "",
    selectedProduct: "",
    filteredProducts: [],
    categories: [
      {
        id: 1,
        type: "Food",
        name: "Food",
        value: "Food",
      },
      {
        id: 2,
        type: "Drinks",
        name: "Drinks",
        value: "Drinks",
      },
    ],
    products: [
      {
        id: 1,
        type: "Food",
        name: "Chiken 65",
        parent_id: 1,
        value: "001",
      },
      {
        id: 2,
        type: "Food",
        name: "Magie",
        parent_id: 1,
        value: "002",
      },
      {
        id: 3,
        type: "Food",
        name: "Mutton Roast",
        parent_id: 1,
        value: "003",
      },
      {
        id: 4,
        type: "Drinks",
        name: "Pepsi",
        parent_id: 2,
        value: "004",
      },
      {
        id: 5,
        type: "Drinks",
        name: "Beer",
        parent_id: 2,
        value: "005",
      },
      {
        id: 6,
        type: "Drinks",
        name: "7Up",
        parent_id: 2,
        value: "006",
      },
    ],
  };
},

Step 3: Add an onChange event for category

methods: {
  onChangeCategory() {
    this.selectedProduct = "";
    this.filteredProducts = this.products.filter((item) => {
      return item.parent_id === this.selectedCategory.id;
    });
  },
},

DEMO