第42天~

这个得上一篇:https://ithelp.ithome.com.tw/articles/10258452

到cart.service.spec.ts档案

import { ProductService } from 'src/app/services/product.service';
import { TestBed } from '@angular/core/testing';

import { CartService } from './cart.service';

describe('ProductService', () => {

  beforeEach(() =>
    TestBed.configureTestingModule({}));

  it('should be created', () => {
    const service: ProductService =TestBed.get(ProductService);
    expect(service).toBeTruthy();
  });
});

app.component.spec.ts 档案:

import { TestBed } from '@angular/core/testing';

import { ProductService } from './product.service';

describe('ProductService', () => {
  beforeEach(() => TestBed.configureTestingModule({}));

  it('should be created', () => {
    // tslint:disable-next-line: deprecation
    const service: ProductService = TestBed.get(ProductService);
    expect(service).toBeTruthy();
  });
});

这里到cart-details.component.html 档案:

<div class="main-content">
  <div class="section-content section-content-p30">
      <div class="container-fluid">

          <table class="table table-bordered">
              <tr>
                  <th width="20%">Product Image</th>
                  <th width="50%">Product Detail</th>
                  <th width="30%"></th>
              </tr>

              <tr *ngFor="let tempCartItem of cartItems">
                  <td>
                      <img src="{{ tempCartItem.imageUrl }}" class="img-responsive" width="150px" />
                  </td>
                  <td>
                      <p>{{ tempCartItem.name }}</p>
                      <p>{{ tempCartItem.unitPrice | currency: 'USD' }}</p>
                  </td>
                  <td>
                      <div class="items">
                          <label>Quantity:</label> {{ tempCartItem.quantity }}
                      </div>

                      <p class="mt-2">Subtotal: {{ tempCartItem.quantity * tempCartItem.unitPrice | currency: 'USD' }}</p>
                  </td>
              </tr>

              <tr>
                  <td colspan="2"></td>
                  <td style="font-weight: bold">
                      <p>Total Quantity: {{ totalQuantity }}</p>
                      <p>Shipping: FREE</p>
                      <p>Total Price: {{ totalPrice | currency: 'USD' }}</p>
                  </td>
              </tr>

          </table>

      </div>
  </div>
</div>

这里卡在只有选书才能跳转~我来debug一下

目前是加总不准~我再回来debug
QQ

後来发现是到 cart.service.ts档案的CODE打错了~是theCartItem 而不是tempCartItem:

import { CartItem } from './../common/cart-item';
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class CartService {

  cartItems: CartItem[]=[];

  totalPrice: Subject<number> = new Subject<number>();
  totalQuantity: Subject<number> = new Subject<number>();


  constructor() { }

  addToCart(theCartItem:CartItem){


    let alreadyExistsInCart : boolean = false;
    let existingCartItem: CartItem = undefined;

    if (this.cartItems.length>0){

     existingCartItem = this.cartItems.find( tempCartItem => tempCartItem.id === theCartItem.id);

      alreadyExistsInCart =(existingCartItem != undefined);
    }

    if (alreadyExistsInCart){
      existingCartItem.quantity++;
    }
    else{
      this.cartItems.push(theCartItem);
    }

    this.computeCartTotals();


  }
  computeCartTotals() {

    let totalPriceValue: number =0;
    let totalQuantityValue: number =0;

    for(let currentCartItem of this.cartItems){
      totalPriceValue += currentCartItem.quantity * currentCartItem.unitPrice;
      totalQuantityValue += currentCartItem.quantity;
    }

    this.totalPrice.next(totalPriceValue);
    this.totalQuantity.next(totalQuantityValue);

    this.logCartData(totalPriceValue, totalQuantityValue);

      }
  logCartData(totalPriceValue: number, totalQuantityValue: number) {

    console.log('Contents of the cart');
    for (let tempCartItem of this.cartItems){
      const subTotalPrice = tempCartItem.quantity * tempCartItem.unitPrice;
      console.log(`name: ${tempCartItem.name}, quantity=${tempCartItem.quantity},unitPrice=${tempCartItem.unitPrice},subTotalPrice=${subTotalPrice}`);
    }

    console.log(`totalPrice: ${totalPriceValue.toFixed(2)}, totalQuantity: ${totalQuantityValue}`);
    console.log('----');

  }
}

按再多都会自动加总

再到app.component.html档案

从这里开始改

改成

再回到cart-details.component.html 档案

<div class="main-content">
  <div class="section-content section-content-p30">
      <div class="container-fluid">
       <div *ngIf="cartItems.length > 0">
          <table class="table table-bordered">
              <tr>
                  <th width="20%">Product Image</th>
                  <th width="50%">Product Detail</th>
                  <th width="30%"></th>
              </tr>
              <tr *ngFor="let tempCartItem of cartItems">
                  <td>
                      <img src="{{ tempCartItem.imageUrl }}" class="img-responsive" width="150px" />
                  </td>
                  <td>
                      <p>{{ tempCartItem.name }}</p>
                      <p>{{ tempCartItem.unitPrice | currency: 'USD' }}</p>
                  </td>
                  <td>
                      <div class="items">
                          <label>Quantity:</label> {{ tempCartItem.quantity }}
                      </div>

                      <p class="mt-2">Subtotal: {{ tempCartItem.quantity * tempCartItem.unitPrice | currency: 'USD' }}</p>
                  </td>
              </tr>
              <tr>
                  <td colspan="2"></td>
                  <td style="font-weight: bold">
                      <p>Total Quantity: {{ totalQuantity }}</p>
                      <p>Shipping: FREE</p>
                      <p>Total Price: {{ totalPrice | currency: 'USD' }}</p>
                  </td>
            </tr>

          </table>
      </div>
  </div>
</div>
</div>

然後再来写如果购物车是空的要显示:

<div class="main-content">
  <div class="section-content section-content-p30">
      <div class="container-fluid">
       <div *ngIf="cartItems.length > 0">
          <table class="table table-bordered">
              <tr>
                  <th width="20%">Product Image</th>
                  <th width="50%">Product Detail</th>
                  <th width="30%"></th>
              </tr>
              <tr *ngFor="let tempCartItem of cartItems">
                  <td>
                      <img src="{{ tempCartItem.imageUrl }}" class="img-responsive" width="150px" />
                  </td>
                  <td>
                      <p>{{ tempCartItem.name }}</p>
                      <p>{{ tempCartItem.unitPrice | currency: 'USD' }}</p>
                  </td>
                  <td>
                      <div class="items">
                          <label>Quantity:</label> {{ tempCartItem.quantity }}
                      </div>

                      <p class="mt-2">Subtotal: {{ tempCartItem.quantity * tempCartItem.unitPrice | currency: 'USD' }}</p>
                  </td>
              </tr>
              <tr>
                  <td colspan="2"></td>
                  <td style="font-weight: bold">
                      <p>Total Quantity: {{ totalQuantity }}</p>
                      <p>Shipping: FREE</p>
                      <p>Total Price: {{ totalPrice | currency: 'USD' }}</p>
                  </td>
            </tr>

          </table>
      </div>

     <div *ngIf="cartItems.length ==0" class="alert alert-waring col-md-12" role="alert">

      购物车是空的

     </div>



  </div>
</div>
</div>

这个得下一篇:https://ithelp.ithome.com.tw/articles/10258532