NgClass

directive

npm Package	@angular/common
Module	import { NgClass } from '@angular/common';
Source	common/src/directives/ng_class.ts
NgModule	CommonModule

Overview

@Directive({ selector: '[ngClass]' })
class NgClass implements DoCheck {
  set klass: string
  set ngClass: string | string[] | Set<string> | {...}
  ngDoCheck(): void
}

How To Use

<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>

Selectors

[ngClass]

Inputs

Description

The CSS classes are updated as follows, depending on the type of the expression evaluation:

• string - the CSS classes listed in the string (space delimited) are added,
• Array - the CSS classes declared as Array elements are added,
• Object - keys are CSS classes that get added when the expression given in the value evaluates to a truthy value, otherwise they are removed.

Constructor

Members

set klass: string

set ngClass: string | string[] | Set<string> | { [klass: string]: any; }

ngDoCheck(): void