NgClass

What it does

Adds and removes CSS classes on an HTML element.

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>

Selectors

[ngClass]

Class Description

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

• string - the CSS classes listed in a string (space delimited) are added,
• Array - the CSS classes (Array elements) are added,
• Object - keys are CSS class names that get added when the expression given in the value

         evaluates to a truthy value, otherwise class are removed.
  

Constructor

constructor(_iterableDiffers: IterableDiffers, _keyValueDiffers: KeyValueDiffers, _ngEl: ElementRef, _renderer: Renderer)