Angular 2.0形成回调和逻辑问题

Question

我对Angular非常陌生，我正努力创建一个简单的脚本来在表单输入的值更改时更新价格。 在类驱动和指令驱动的模型中使用Angular似乎有几种不同的方法。 请从主要的角度网站阅读文档，但是没有运气。

import { Component } from '@angular/core';
export class Ticket {
  ticketNumber: number;
  name: string;
  price: number;
}
@Component({
  selector: 'my-app',
  template: `
    <form name="myForm">
    <div class="ticket box_shadows">
       <div class="ticket_title">{{ticket.name}}</div>
        <input type="number" name="myInput" class="ticket_ammount" min="1" max="10" value="{{ticket.ticketNumber}}"required ng-class="updatePrice(price,ticketNumber)">
        <div class="ticket_details"><input class="ticket_details_input" type="text"  placeholder="Name:" required></div>
        <div class="ticket_details"><input class="ticket_details_input" type="email" placeholder="your@email.com" required></div>
        <div class="ticket_details"><input class="ticket_details_input" type="text"  placeholder="+852" required></div>
        <div class="ticket_price">$ <input type="number" name="price" value="{{ticket.price}}|>
        <button type="button" class="ticket_button">Book</button>
        </div>
    </div>
    </form>
    `
})
//creates the class
export class AppComponent {
  ticket: Ticket = {
    ticketNumber: 1,
    name: 'Ticket',
    price: 300 
  };
  //updates the price on a new click
  updatePrice(value, ticketN){
      value = value * ticketN;
      return value; 
      // this then needs to be passed back to the price input field. 
  }
}

-----更新-------所以我在调用两个类并尝试使它们交互时遇到问题。 我剥离了代码，然后再次开始，这就是我投入的工作。

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `
    <form>
    <div class="ticket box_shadows">
        <div class="ticket_top">
            <div class="ticket_title">{{title}}</div>
          <input type="number" name="myInput" class="ticket_ammount" min="1" max="10" [(ngModel)]="ticket" (click)="updatePrice()" required>
        </div>
        <div class="ticket_btm">
            <div class="ticket_price"><span>$</span><input type="number" [(ngModel)]="totalPrice" class="ticket_price_number" disabled></div>
            <div class="ticket_btm_spacer"></div>
            <button type="button" class="ticket_button">Book</button>
        </div>
    </div>
    </form>
    `
})
export class AppComponent {
  ticket: number = 1;
  title: string = "Ticket";
  price: number = 300;
  totalPrice: number = 300; 
  updatePrice(){
    this.totalPrice = this.price * this.ticket;
    if(this.ticket >= 2){
      this.title = "Tickets";
    }
    else{ this.title = "Ticket";}
  } 
}

Answer 1

要以两种方式将值绑定到输入，您需要使用ngModel 。

<input [(ngModel)]="ticket.price">