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

这对我来说很管用:

[ngClass]="{'active': dashboardComponent.selected_menu == 'profile'}"

其他回答

让,YourCondition是你的条件或布尔属性,然后像这样做

[class.yourClass]="YourCondition"

ngClass让:

[ngClass]="{'classname' : conditionFlag}"

你可以这样用:

<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>

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;
  }

在Angular 7中。X

根据表达式求值的类型,CSS类的更新如下:

string -添加字符串中列出的CSS类(空格分隔) Array—添加声明为Array元素的CSS类 对象键是CSS类,当值中给出的表达式计算为真值时添加,否则将删除它们。

<some-element [ngClass]="'first second'">...</some-element>

<some-element [ngClass]="['first', 'second']">...</some-element>

<some-element [ngClass]="{'first': true, 'second': true, 'third': false}">...</some-element>

<some-element [ngClass]="stringExp|arrayExp|objExp">...</some-element>

<some-element [ngClass]="{'class1 class2 class3' : true}">...</some-element>