Angular How to toggle the color of a button wich is inside a button group if it is clicked?

问题

I have a group of buttons in an angular 6 component:

<div class="container">
    <div class="row">
      <div class="clearfix text-center" [hidden]="!searchTerm">
        <span class="inline">Filter results by :</span>
        <div class="float-right">
          <button type="submit" class="btn btn-primary" (click)="performSearch(searchTerm)">All</button>
          <button type="submit" class="btn btn-secondary" (click)="domainesFilter(searchTerm)">Domaines</button>
          <button type="submit" class="btn btn-secondary" (click)="sectionsFilter(searchTerm)">Sections</button>
          <button type="submit" class="btn btn-secondary" (click)="groupsFilter(searchTerm)">Groups</button>
          <button type="submit" class="btn btn-secondary" (click)="documentFilter(searchTerm)">Documents</button>
     
        </div>
      </div>
    </div>
  </div>

I want to change the color of the button to primary if it is clicked and set the color of the other buttons to secondary, how can I achieve that?

回答1:

You can do something like this:

Component 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';
  }

}

Template

<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>

Otherwise you could assign .btn-secondary to all your buttons, then adding btn-primary only if necessary like this:

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

With this solution you may need to adjust your css to be sure that btn-primary class overrides all of the properties of btn-secondary class

回答2:

<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>

And js code is like this.

 Search(searchTerm, btn) {
    this.ActiveButton = btn;
    switch ( btn ) {
      case 'All':
      console.log('All');
      break;
      case 'Domaines':
      console.log('Domaines');
      break;
      case 'Sections':
      console.log('Sections');
      break;
      case 'Groups':
      console.log('Groups');
      break;
      case 'Documents':
      console.log('Documents');
      break;
    }
  }

来源：https://stackoverflow.com/questions/50640024/angular-how-to-toggle-the-color-of-a-button-wich-is-inside-a-button-group-if-it