我的Angular代码出了什么问题?我得到以下错误:
无法读取BrowserDomAdapter.removeClass中未定义的属性“remove”
<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>
当前回答
在下面的例子中，你可以使用IF ELSE
<p class="{{condition ? 'checkedClass' : 'uncheckedClass'}}">
<p [ngClass]="condition ? 'checkedClass' : 'uncheckedClass'">
<p [ngClass]="[condition ? 'checkedClass' : 'uncheckedClass']">
其他回答
这对我来说很管用:
[ngClass]="{'active': dashboardComponent.selected_menu == 'profile'}"
<div class="collapse in " [ngClass]="(active_tab=='assignservice' || active_tab=='manage')?'show':''" id="collapseExampleOrganization" aria-expanded="true" style=""> <ul> <li class="nav-item" [ngClass]="{'active': active_tab=='manage'}"> <a routerLink="/main/organization/manage" (click)="activemenu('manage')"> <i class="la la-building-o"></i> <p>Manage</p></a></li> <li class="nav-item" [ngClass]="{'active': active_tab=='assignservice'}"><a routerLink="/main/organization/assignservice" (click)="activemenu('assignservice')"><i class="la la-user"></i><p>Add organization</p></a></li> </ul></div>
代码是ngClass if else条件的好例子。
[ngClass]="(active_tab=='assignservice' || active_tab=='manage')?'show':''"
[ngClass]="{'active': active_tab=='assignservice'}"
另一个解决方案是使用[class.active]。
例子:
<ol class="breadcrumb">
<li [class.active]="step=='step1'" (click)="step='step1'">Step1</li>
</ol>
此外，您可以添加与方法函数:
在HTML中
<div [ngClass]="setClasses()">...</div>
在component.ts
// Set Dynamic Classes
setClasses() {
let classes = {
constantClass: true,
'conditional-class': this.item.id === 1
}
return classes;
}
ngClass的正常结构是:
[ngClass]="{'classname' : condition}"
所以在你的情况下，就像这样使用它……
<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>
