What is wrong with my Angular code? I am getting the following error:
Cannot read property 'remove' of undefined at BrowserDomAdapter.removeClass
<ol>
<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>
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 options:
[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'"
You can find these examples on the the documentation page.