Angular 2 Heroes Tutorial缺少重复值

时间:2016-06-18 13:50:48

标签: angular typescript

我试图跟随Angular 2" Tour of Heroes"教程,但我遇到了问题。宣布" onSelect" (点击)事件的方法,英雄的英雄列表'空白。这就是我到目前为止所做的:

app.component.ts:

import {Component} from '@angular/core';
import {MyComponent} from './my-component';



@Component({
    selector: 'my-app',
    template: `

        <h1>{{title}}</h1>
        <h2>My Heroes</h2>
        <ul class = 'heroes'>
            <li *ngFor="let hero of heroes" (click)='onSelect(hero)'>
                <span class='badge'>{{hero.id}}</span>
                {{hero.name}}
            </li>
        </ul>
        <h2>{{selectedHero.name}} details!</h2>
        <div><label>id: </label>{{selectedHero.id}}</div>
        <div>
            <label>name: </label><input [(ngModel)] ='selectedHero.name' placeholder = 'name'>
        </div>

        `,

    directives: [MyComponent]

    styles: [`
      .selected {
        background-color: #CFD8DC !important;
        color: white;
      }
      .heroes {
        margin: 0 0 2em 0;
        list-style-type: none;
        padding: 0;
        width: 15em;
      }
      .heroes li {
        cursor: pointer;
        position: relative;
        left: 0;
        background-color: #EEE;
        margin: .5em;
        padding: .3em 0;
        height: 1.6em;
        border-radius: 4px;
      }
      .heroes li.selected:hover {
        background-color: #BBD8DC !important;
        color: white;
      }
      .heroes li:hover {
        color: #607D8B;
        background-color: #DDD;
        left: .1em;
      }
      .heroes .text {
        position: relative;
        top: -3px;
      }
      .heroes .badge {
        display: inline-block;
        font-size: small;
        color: white;
        padding: 0.8em 0.7em 0 0.7em;
        background-color: #607D8B;
        line-height: 1em;
        position: relative;
        left: -1px;
        top: -4px;
        height: 1.8em;
        margin-right: .8em;
        border-radius: 4px 0 0 4px;
      }
      `]

})
export class AppComponent { 

    title = 'Tour of Heroes';

    public heroes = HEROES;

    selectedHero: Hero;

    function onSelect(hero: Hero) {
        selectedHero: hero;
    }

}



export class Hero {
    id: number;
    name: string;
}

const HEROES: Hero[] = [
    { id: 11, name: 'Mr. Nice' },
    { id: 12, name: 'Narco' },
    { id: 13, name: 'Bombasto' },
    { id: 14, name: 'Celertitas' },
    { id: 15, name: 'Megneta' },
    { id: 16, name: 'Rubberman' },
    { id: 17, name: 'Dynama' },
    { id: 18, name: 'Dr IQ' },
    { id: 19, name: 'Magma' },
    { id: 20, name: 'Tornado' }

];

我在终端上遇到的错误:

  

app / app.component.ts(28,2):错误TS1005:&#39;,&#39;预期

     

app / app.component.ts(87,2):错误TS1068:意外的令牌。一个   期望构造函数,方法,访问器或属性。

     

app / app.component.ts(91,1):错误TS1128:声明或声明   预期

2 个答案:

答案 0 :(得分:1)

我根据你得到的错误猜测是:

- 1 add comma after directives array declaration on line 28
- 2 remove 'function' before your onSelect on line 87
- 3 assign value to var selectedHero like this on line 88 
        selectedHero = hero;

答案 1 :(得分:1)

正如您的错误堆栈跟踪告诉您:

  1. directives: [MyComponent],

  2. 之后添加逗号
  3. function功能声明中删除onSelect关键字。

  4. hero函数中将this.selectedHero变量分配给selectedHero而不只是onSelect

  5. 请注意,即使您执行了所有这些操作,在运行代码时您也不会看到英雄列表,因为您应该从教程中实现额外的步骤以显示列表正常。所以,解决所有这些问题,然后在你的教程中进一步发挥作用。