如何將ngModel值傳遞給Angular 6中的組件

Question

我正在研究Angular 6電子商務項目並將PayPal付款整合到其中。 我在html中添加了paypal按鈕，我在[（ngModel）]中獲得金額，但是，我要在組件文件中傳遞它，以便可以在paypal配置中讀取它。 任何更好或替代的解決方案都受到高度贊揚

以下是文件：

1. 購物推車-summary.html

<div *ngIf="cart$ | async as cart">
  <input type="number" [(ngModel)]="cart.totalPrice">
  <div id="paypal-checkout-btn"></div> 
</div>

2. 購物推車，summary.ts

totalPrice: number;

public ngAfterViewChecked(): void {
  const elementExists: boolean = !!document.getElementById('paypal-checkout-btn');
  if(elementExists && !this.addScript) {
    this.addPaypalScript().then(() => {
      paypal.Button.render({
        client: {
            sandbox: 'My sandbox API',
        },
        payment: (data, actions) => {
            return actions.payment.create({
                payment: {
                  transactions: [
                    {
                        amount: {
                            total:    this.totalPrice,
                            currency: 'USD'
                        },
                        payee:{email:'My Email ID'},
                    }
                ]
                }
            });
        },
        commit: true,
        locale: 'en_US',
        style: {
            size:   'medium', // tiny, small, medium
            color:  'blue', // orange, blue, silver
            shape:  'pill'    // pill, rect
        },
        env: 'sandbox', // Optional: specify 'sandbox' or 'production'
        onAuthorize: (data, actions) => {
            return actions.payment.execute().then((payment) => {
                console.log('payment 1 completed!');
            });
        },
        onCancel: (data) => {
            console.log('payment 1 was cancelled!');
        }
    }, '#paypal-checkout-btn');
      this.paypalLoad = false;
    });
  }
}

我在[（ngModel）]中獲得的值為$ 182，我想在組件文件中傳遞它，那么怎么做呢？ 有什么建議么？？

以下是產品總價的截圖

Answer 1

而不是totalPrice：number; 在你的component.ts中使用cert = {“totalPrice”：0}; 否則，在component.html中使用totalPrice而不是cert.totalPrice。

Answer 2

由於cart$是一個可觀察的，您將需要訂閱它以獲取值或在可管道運算符中使用它。

嘗試這個：

cart$: Observable<any>;
totalPrice: number;

public ngAfterViewChecked(): void {
    const elementExists: boolean = !!document.getElementById('paypal-checkout-btn');

    cart$.subscribe((cart: any) => {
        this.totalPrice = cart.totalPrice;
    })

  if(elementExists && !this.addScript && this.totalPrice) {
    this.addPaypalScript().then(() => {
        paypal.Button.render({
            client: {
                sandbox: 'My sandbox API',
            },
            payment: (data, actions) => {
                return actions.payment.create({
                    payment: {
                        transactions: [
                            {
                                amount: {
                                    total: this.totalPrice,
                                    currency: 'USD'
                                },
                                payee: { email: 'My Email ID' },
                            }
                        ]
                    }
                });
            },
            commit: true,
            locale: 'en_US',
            style: {
                size: 'medium', // tiny, small, medium
                color: 'blue', // orange, blue, silver
                shape: 'pill'    // pill, rect
            },
            env: 'sandbox', // Optional: specify 'sandbox' or 'production'
            onAuthorize: (data, actions) => {
                return actions.payment.execute().then((payment) => {
                    console.log('payment 1 completed!');
                });
            },
            onCancel: (data) => {
                console.log('payment 1 was cancelled!');
            }
        }, '#paypal-checkout-btn');
        this.paypalLoad = false;
    });
}