NgClass

Adds and removes CSS classes on an HTML element.

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NgModule

• CommonModule

Selectors

• [ngClass]

Properties

Property	Description
@Input('class')klass: string	Write-only.
@Input()ngClass: string | string[] | Set<string> | { [klass: string]: any; }	Write-only.

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>

Methods

ngDoCheck()
ngDoCheck(): void Parameters There are no parameters. Returns void