在两个组件之间传递变量而没有继承角度2

时间:2017-10-09 22:33:48

标签: angular inheritance

我试图将单个变量从一个组件传递到另一个组件。它是一个数组,声明如下。

@Component({
  selector: 'component1',
  templateUrl: './component1.component.html',
  styleUrls: ['./component1.css'],
})
export class Component1 implements OnInit{
  ......
  columnVars = Object.keys(this.settings.columns);
  ......
}

所以我设置了我的第二个组件来扩展我的第一个组件并像这样引用变量,它就像预期的那样工作。

<table>
  <thead>
    <tr>
      <th>Column</th>
      <th>Description</th>
    </tr>
  </thead>
    <tbody *ngFor="let col of columnVars">
      <tr>
        <td>{{settings.columns[col]['title']}}</td>
        <td>{{settings.columns[col]['description']}}</td>
      </tr>
    </tbody>
</table>

第二个组件看起来像这样,这就是问题所在。

@Component({
  selector: 'component2',
  templateUrl: './component2.html',
  styleUrls: ['./component2.css']
})

export class Component2 extends Component1 implements OnInit {

  buttonObjList = {
    headendsButton: {
      title: 'Back to headends',
      route: '/headends',
    }
  };
}

我收到错误

ERROR in /home/grady/honeybadger-mat/src/app/column-info/column-info.component.ts (9,14): Class 'ColumnInfoComponent' incorrectly extends base class 'IngestViewComponent'.

  Types of property 'buttonObjList' are incompatible.
    Type '{ headendsButton: { title: string; route: string; }; }' is not assignable to type '{ columnInfo: { title: string; route: string; }; }'.
      Property 'columnInfo' is missing in type '{ headendsButton: { title: string; route: string; }; }'.

哪个有道理。所以现在我的问题是有没有办法将一个变量传递给另一个没有继承的组件或一种覆盖特定的继承变量如buttonObjList的方法?先感谢您。

编辑:为了澄清我不需要在我的第一个组件中显示第二个组件。所以看来@input指令在这种情况下对我没有好处。如果我错了,请纠正我。

1 个答案:

答案 0 :(得分:1)

you can Achieve following way.

First Method:-(Global Variable Set and Get Example)

Step 1:
Declare a Global Variable in app.component.ts

export class AppComponent  {
    public static dataNavigate;
}
Step2:
import a App Component in Your Value Set Component(first.component.ts)

import {AppComponent} from '../app.component.ts';

AppComponent.columnVars = Object.keys(this.settings.columns);
//Your Value Set here

Now you can access every component in your app.
second.component.ts
import {AppComponent} from './app.component';

constructor(){
  console.log(AppComponent.columnVars);
}



Second Method:-(Common Service)

Step 1:
      Create a Service
dataService.ts
---------
import { Injectable } from '@angular/core';

@Injectable()
export class DataService {
constructor(){

}
public columnVars:any;
}

Step 2:
Import app.module.ts file

import {DataService} from './data.service';

providers:[DataService]

Step 3:
Set the Value to the Common Service Variable

first.component.ts
import {DataService} from './data.service';

constructor(dataService:DataService){
  this.dataService.columnVars="whatever maybe json or object etc..";
}

Step 4:
Access that you can do same way step3
second.component.ts
import {DataService} from './data.service';

constructor(dataService:DataService){
  console.log(this.dataService.columnVars);
}

其他方式也可以将变量设置为某个会话或localstorage并使用它 进一步访问 Local storage in Angular 2

我相信它很有用。