另一个组件上的Angular 2样式组件按钮单击

时间:2018-04-28 12:45:38

标签: angular styles

我在一个触发功能的组件上有按钮:

<button class="btn-main" (click)="hideElement()"></button>

在弹出窗口的另一个组件中(没有父子连接),我有3个像这样的div

 <div class="element1"></div>

当我点击父级中的按钮时,我希望隐藏一个(设置具有可见性的类:隐藏)。当我用那个按钮打开弹出框时,如何隐藏该div?

2 个答案:

答案 0 :(得分:0)

子模板中的

people$students
子组件中的

people$teachers
在父母的

<div class="element1" #element1 ></div>

答案 1 :(得分:0)

方法1 - 亲子关系

您可以使用hideDiv属性隐藏或显示子组件中的div,并使该属性可用于与@Input装饰器进行数据绑定。该属性可以直接切换visibility样式或将类应用于div:

@Component({
  selector: 'child-component',
  template: `
    <div></div>
    <div [class.hiddenClass]="hideDiv"></div>
    <div [style.visibility]="hideDiv ? 'hidden' : 'visible'"></div>
    <div></div>
  `,
  styles: [`.hiddenClass { visibility: hidden; }`]
})
export class ChildComponent {
  @Input() hideDiv = false;
}

然后,当您单击父组件中的按钮时,您将使用数据绑定对其进行修改:

@Component({
  selector: 'parent-component',
  template: `
    <button (click)="hideChildDiv = !hideChildDiv">Toggle div visibility</button>
    <child-component [hideDiv]="hideChildDiv" ></child-component>
  `
})
export class ParentComponent {
  hideChildDiv = false;
}

您可以在this stackblitz中测试代码。

方法2 - 具有服务的两个组件之间的通信

您可以使用服务允许两个单独的组件相互通信或共享一些信息。有关演示,请参阅this stackblitz

<强>服务

import { Injectable } from "@angular/core"

@Injectable()
export class VisibilityService {
  hideDiv = false;
}

父组件

@Component({
  selector: 'app-root',
  template: `
    <child1></child1>
    <child2></child2>
  `
})
export class AppComponent {
}

Child1组件

import { VisibilityService } from "./visibility.service";

@Component({
  selector: 'child1',
  template: `
    <button (click)="hideDiv = !hideDiv">Toggle div visibility</button>
  `
})
export class Child1Component {

  public get hideDiv(): boolean {
    return this.visibilityService.hideDiv;
  }

  public set hideDiv(value: boolean) {
    this.visibilityService.hideDiv = value;
  }

  constructor(private visibilityService: VisibilityService) { }
}

Child2组件

import { VisibilityService } from "./visibility.service";

@Component({
  selector: 'child2',
  template: `
    <div class="div1"></div>
    <div class="div1" [class.hiddenClass]="hideDiv"></div>
    <div class="div1"></div>
    <div class="div1" [style.visibility]="hideDiv ? 'hidden' : 'visible'"></div>
    <div class="div1"></div>
  `
})
export class Child2Component {

  public get hideDiv(): boolean {
    return this.visibilityService.hideDiv;
  }

  constructor(private visibilityService: VisibilityService) { }
}

<强>模块

...

import { AppComponent } from './app.component';
import { Child1Component } from './child1.component';
import { Child2Component } from './child2.component';
import { VisibilityService } from "./visibility.service";

@NgModule({
  declarations: [ 
    AppComponent,
    Child1Component,
    Child2Component
  ],
  providers: [
    VisibilityService
  ],
  ...
})
export class AppModule { }