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NgClass

Adds and removes CSS classes on an HTML element.

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NgModule

Selectors

Properties

Property Description
@Input('class')
klass: string
Write-only.
@Input()
ngClass: any
Write-only.

Inherited from NgClassBase

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.
<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>
      
      <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>
    

Methods

ngDoCheck()
      
      ngDoCheck()
    
Parameters

There are no parameters.

Inherited from NgClassBase