p.location-badge. exported from angular2/forms defined in angular2/src/forms/directives/default_value_accessor.ts (line 5) :markdown The default accessor for writing a value and listening to changes that is used by the NgModel, NgFormControl, and NgControlName directives. # Example ``` ``` .l-main-section h2 Members .l-sub-section h3 constructor pre.prettyprint code. constructor(cd: NgControl, renderer: Renderer, elementRef: ElementRef) :markdown .l-sub-section h3 value :markdown .l-sub-section h3 onChange :markdown .l-sub-section h3 onTouched :markdown .l-sub-section h3 cd :markdown .l-sub-section h3 renderer :markdown .l-sub-section h3 elementRef :markdown .l-sub-section h3 writeValue pre.prettyprint code. writeValue(value) :markdown .l-sub-section h3 registerOnChange pre.prettyprint code. registerOnChange(fn) :markdown .l-sub-section h3 registerOnTouched pre.prettyprint code. registerOnTouched(fn) :markdown