Angular2如何将选定的值传递给其他组件 [英] Angular2 How to pass selected value to other component

问题描述

我正在尝试传递从选项之一中选择的值。
我使用了ngModel来保存值，但我不知道如何将其传递给其他组件。由于它们是连接的但不是嵌套的，因此我无法使用Eventemitter，因为我认为使用Eventemiiter，因此我应该使用子组件的选择器将组件嵌套在父组件中，而我不想这样做。

Hi I am tryng to pass value selected from one of the options. I used ngModel to save the value but I can't figure out how to pass it to other component. Since they are connected but not nested, I couldn't use Eventemitter cause I reckon to use Eventemiiter, I should use child component's selector to nest the component in the parent component which I do not want to do.

这两个组件是分开的，我想将所选值传递给另一个组件吗？我该如何实现？

These two components are seperated and I want to pass selected value to the other component? How can I achieve this?

下面是我的代码。

组件1的模板

 <div>
    <select (change)="printValue()" formControlName="dogName"  
     class="form-control"  
     class="selectionbox"
     [(ngModel)]="selected_dog" required> 

  <option *ngFor="let d of dogs" [ngValue]="d">
     {{d.dogName}}
  </option>
     </select>

Component1的组件

Component1's component

     selected_dog: string; 
     printValue () { 
     console.log (this.selected_dog)} // checked if the value is properly stored. 

现在，我想将 selected_dog值传递给Component2。
Component2

And now, I want to pass 'selected_dog' value to Component2. Component2

     value1: string; //how to pass selected_dog value to component2's value1. 

我不确定要使用什么（eventEmitter，输出/输入？/ ng含量？）

I am not sure what to use ( eventEmitter, output/ input? / ng-content?)

感谢您的帮助。

推荐答案

我建议您创建一个服务并存储变量值，在这两个组件之间使用变量。

I would suggest you to create a service and store the variable value, use the variable across those 2 components.

@Injectable()
export class AppMessageService {
    value1: string;
   constructor() { 
     this.value1="";
   }
}

setValue(data: string) {
 this.value1= data;
}

getValue() {
 return this.value1;
}

注入上述服务，并使用setValue设置第一个组件中的值和getValue在第二部分中。

Inject the above service and use setValue to set the value in 1st component and getValue in the 2nd component.

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