What is wrong with my Angular code? I am getting: Cannot read property ‘remove’ of undefined at BrowserDomAdapter.removeClass …
<ol class="breadcrumb">
<li *ngClass="{active: step==='step1'}" (click)="step='step1; '">Step1</li>
<li *ngClass="{active: step==='step2'}" (click)="step='step2'">Step2</li>
<li *ngClass="{active: step==='step3'}" (click)="step='step3'">Step3</li>
</ol>
Answer
Angular version 2+ provides several ways to add classes conditionally:
type one
[class.my-class]="step === 'step1'"
type two
[ngClass]="{'my-class': step === 'step1'}"
and multiple option:
[ngClass]="{'my-class': step === 'step1', 'my-class2':step === 'step2' }"
type three
[ngClass]="{1:'my-class1',2:'my-class2',3:'my-class4'}[step]"
type four
[ngClass]="(step=='step1')?'my-class1':'my-class2'"