Twitter bootstrap 3 如果单击按钮组中的按钮，如何切换其颜色？

我有一组按钮在一个角度6的组成部分：

通过以下方式筛选结果：
全部的
与葡萄园
小节
组
文件

您可以执行以下操作：

<button type="submit" class="btn btn-secondary" [ngClass]="{'btn-primary' : selBtn === 'e'}" (click)="performE()">E</button>

组件ts

@Component({
  selector: 'app-my',
  templateUrl: './my.component.html',
  styleUrls: ['./my.component.css']
})
export class MyComponent implements OnInit {

  selBtn: string;

  constructor() { }

  ngOnInit() {
  }

  performA(): void {
    this.selBtn = 'a';
  }

  performB(): void {
    this.selBtn = 'b';
  }

  performC(): void {
    this.selBtn = 'c';
  }

  performD(): void {
    this.selBtn = 'd';
  }

  performE(): void {
    this.selBtn = 'e';
  }

}

模板

<div class="container">
  <div class="row">
    <div class="clearfix text-center">
      <span class="inline">Filter results by :</span>
      <div class="float-right">
        <button type="submit" class="btn {{ selBtn === 'a' ? 'btn-primary' : 'btn-secondary' }}" (click)="performA()">A</button>
        <button type="submit" class="btn {{ selBtn === 'b' ? 'btn-primary' : 'btn-secondary' }}" (click)="performB()">B</button>
        <button type="submit" class="btn {{ selBtn === 'c' ? 'btn-primary' : 'btn-secondary' }}" (click)="performC()">C</button>
        <button type="submit" class="btn {{ selBtn === 'd' ? 'btn-primary' : 'btn-secondary' }}" (click)="performD()">D</button>
        <button type="submit" class="btn {{ selBtn === 'e' ? 'btn-primary' : 'btn-secondary' }}" (click)="performE()">E</button>
      </div>
    </div>
  </div>
</div>

通过以下方式筛选结果：
A.
B
C
D
E

否则，您可以将.btn secondary分配给所有按钮，然后仅在必要时添加btn primary，如下所示：

<button type="submit" class="btn btn-secondary" [ngClass]="{'btn-primary' : selBtn === 'e'}" (click)="performE()">E</button>

E

使用此解决方案，您可能需要调整css，以确保btn主类覆盖btn次类的所有属性

<div class="container">
  <div class="row">
    <div class="clearfix text-center" >
      <span class="inline">Filter results by :</span>
      <div class="float-right">
        <button type="submit" class="btn" [ngClass]="{'btn-primary':ActiveButton=='All', 'btn-secondary':ActiveButton!='All'}" (click)="Search(searchTerm, 'All')">All</button>
        <button type="submit" class="btn" [ngClass]="{'btn-primary':ActiveButton=='Domaines', 'btn-secondary':ActiveButton!='Domaines'}" (click)="Search(searchTerm, 'Domaines')">Domaines</button>
        <button type="submit" class="btn" [ngClass]="{'btn-primary':ActiveButton=='Sections', 'btn-secondary':ActiveButton!='Sections'}" (click)="Search(searchTerm, 'Sections')">Sections</button>
        <button type="submit" class="btn" [ngClass]="{'btn-primary':ActiveButton=='Groups', 'btn-secondary':ActiveButton!='Groups'}" (click)="Search(searchTerm, 'Groups')">Groups</button>
        <button type="submit" class="btn" [ngClass]="{'btn-primary':ActiveButton=='Documents', 'btn-secondary':ActiveButton!='Documents'}" (click)="Search(searchTerm, 'Documents')">Documents</button>
      </div>
    </div>
  </div>
</div>