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
这个例子有点大，但是触发一个类而不是输入内联是我首选的方法。 通过这种方式，您可以在元素中添加尽可能多的可能性。 对于那些想要将多个[ngClass]绑定到单个元素的人来说，可能有一种方法。
<span class="inline-flex items-center font-medium" [ngClass]="addClass">{{ badge.text }}</span>
import { ChangeDetectionStrategy, Component, Input } from '@angular/core';
type Badge = {
size?: 'basic' | 'large';
shape?: 'basic' | 'rounded';
color?: 'gray' | 'red' | 'yellow' | 'green' | 'blue' | 'indigo' | 'purple' | 'pink';
dot?: boolean;
removeButton?: false;
text?: string;
}
@Component({
selector: 'bio-badge',
templateUrl: './badge.component.html',
styleUrls: ['./badge.component.scss'],
changeDetection: ChangeDetectionStrategy.OnPush,
})
export class BioBadgeComponent {
@Input() badge!: Badge;
get addClass() {
return {
'px-2.5 py-0.5 text-sx': this.badge.size === 'basic',
'px-3 py-0.5 text-sm': this.badge.size === 'large',
'rounded-full': this.badge.shape === 'basic',
'rounded': this.badge.shape === 'rounded',
'bg-gray-100 text-gray-800': this.badge.color === 'gray',
'bg-red-100 text-red-800': this.badge.color === 'red',
'bg-yellow-100 text-yellow-800': this.badge.color === 'yellow',
'bg-green-100 text-green-800': this.badge.color === 'green',
'bg-blue-100 text-blue-800': this.badge.color === 'blue',
'bg-indigo-100 text-indigo-800': this.badge.color === 'indigo',
'bg-purple-100 text-purple-800': this.badge.color === 'purple',
'bg-pink-100 text-pink-800': this.badge.color === 'pink',
}
}
}
其他回答
Angular version 2+提供了几种有条件地添加类的方法:
1型
[class.my_class] = "step === 'step1'"
两个类型
[ngClass]="{'my_class': step === 'step1'}"
并有多种选择:
[ngClass]="{'my_class': step === 'step1', 'my_class2' : step === 'step2' }"
三个类型
[ngClass]="{1 : 'my_class1', 2 : 'my_class2', 3 : 'my_class4'}[step]"
四个类型
[ngClass]="step == 'step1' ? 'my_class1' : 'my_class2'"
您可以在文档页上找到这些示例
<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'}"
这个例子有点大，但是触发一个类而不是输入内联是我首选的方法。 通过这种方式，您可以在元素中添加尽可能多的可能性。 对于那些想要将多个[ngClass]绑定到单个元素的人来说，可能有一种方法。
<span class="inline-flex items-center font-medium" [ngClass]="addClass">{{ badge.text }}</span>
import { ChangeDetectionStrategy, Component, Input } from '@angular/core';
type Badge = {
size?: 'basic' | 'large';
shape?: 'basic' | 'rounded';
color?: 'gray' | 'red' | 'yellow' | 'green' | 'blue' | 'indigo' | 'purple' | 'pink';
dot?: boolean;
removeButton?: false;
text?: string;
}
@Component({
selector: 'bio-badge',
templateUrl: './badge.component.html',
styleUrls: ['./badge.component.scss'],
changeDetection: ChangeDetectionStrategy.OnPush,
})
export class BioBadgeComponent {
@Input() badge!: Badge;
get addClass() {
return {
'px-2.5 py-0.5 text-sx': this.badge.size === 'basic',
'px-3 py-0.5 text-sm': this.badge.size === 'large',
'rounded-full': this.badge.shape === 'basic',
'rounded': this.badge.shape === 'rounded',
'bg-gray-100 text-gray-800': this.badge.color === 'gray',
'bg-red-100 text-red-800': this.badge.color === 'red',
'bg-yellow-100 text-yellow-800': this.badge.color === 'yellow',
'bg-green-100 text-green-800': this.badge.color === 'green',
'bg-blue-100 text-blue-800': this.badge.color === 'blue',
'bg-indigo-100 text-indigo-800': this.badge.color === 'indigo',
'bg-purple-100 text-purple-800': this.badge.color === 'purple',
'bg-pink-100 text-pink-800': this.badge.color === 'pink',
}
}
}
像这样试试。
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>
