@angular/forms

RadioControlValueAccessor

directive

The ControlValueAccessor for writing radio control values and listening to radio control changes. The value accessor is used by the FormControlDirective, FormControlName, and NgModel directives.

  
    class RadioControlValueAccessor {}

Using radio buttons with reactive form directives

The follow example shows how to use radio buttons in a reactive form. When using radio buttons in a reactive form, radio buttons in the same group should have the same formControlName. Providing a name attribute is optional.

onChange

() => void

The registered callback function called when a change event occurs on the input element. Note: we declare onChange here (also used as host listener) as a function with no arguments to override the onChange function (which expects 1 argument) in the parent BaseControlValueAccessor class.

name

string

Tracks the name of the radio input element.

formControlName

string

Tracks the name of the FormControl bound to the directive. The name corresponds to a key in the parent FormGroup or FormArray.

value

any

Tracks the value of the radio input element

writeValue

void

Sets the "checked" property value on the radio input element.

@paramvalueany

@returnsvoid

registerOnChange

void

Registers a function called when the control value changes.

@paramfn(_: any) => {}

@returnsvoid

setDisabledState

void

@paramisDisabledboolean

@returnsvoid

fireUncheck

void

Sets the "value" on the radio input element and unchecks it.

@paramvalueany

@returnsvoid

onTouched

() => void

The registered callback function called when a blur event occurs on the input element.

setProperty

void

Helper method that sets a property on a target element using the current Renderer implementation.

@paramkeystring

@paramvalueany

@returnsvoid

registerOnTouched

void

Registers a function called when the control is touched.

@paramfn() => void

@returnsvoid