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Angular: conditional class with *ngClass

发布于 2020-03-31 22:55:10

What is wrong with my Angular code? I am getting:

Cannot read property 'remove' of undefined at BrowserDomAdapter.removeClass ...

HTML

<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>
Questioner
daniel
Viewed
26
675 2020-02-19 13:13

Angular version 2,...,9 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'"