Angular:带 *ngClass 的条件类 [英] Angular: conditional class with *ngClass
本文介绍了Angular:带 *ngClass 的条件类的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我的 Angular 代码有什么问题?我收到以下错误:
<块引用>无法读取 BrowserDomAdapter.removeClass 中未定义的属性remove"
<li *ngClass="{active: step==='step1'}";(click)="step='step1'">Step1<li *ngClass="{active: step==='step2'}";(click)="step='step2'">Step2<li *ngClass="{active: step==='step3'}";(click)="step='step3'">Step3</ol>
解决方案
Angular version 2+ 提供了几种有条件地添加类的方法:
输入一个
[class.my_class] = "step === 'step1'";
类型二
[ngClass]={'my_class': step === 'step1'}";
和多个选项:
[ngClass]={'my_class': step === 'step1', 'my_class2' : step === 'step2' }";
类型三
[ngClass]={1 : 'my_class1', 2 : 'my_class2', 3 : 'my_class4'}[step]";
类型四
[ngClass]="step == 'step1' ?'my_class1' : 'my_class2'"
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>
解决方案
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'"
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