core/dev.fritz2.core/Listener

Listener

value class Listener<X : Event, out T : EventTarget>(events: Flow<X>) : Flow<X>

Encapsulates the Flow of the Event.

Acts as a marker class in order to keep the type of the element, so we can offer dedicated methods to extract values from some specific events.

See also

Constructors

constructor(events: Flow<X>)

Properties

val Flow<MessageEvent>.arrayBuffer: Flow<ArrayBuffer>

gives the MessageEvent.data as Flow of ArrayBuffer

val Flow<MessageEvent>.blob: Flow<Blob>

gives the MessageEvent.data as Flow of Blob

val Flow<MessageEvent>.body: Flow<String>

gives the MessageEvent.data as Flow of String

val Flow<MessageEvent>.data: Flow<Any?>

gives the MessageEvent.data as Flow of Any

val <M : ValidationMessage> Flow<List<M>>.valid: Flow<Boolean>

Checks if a Flow of a List of ValidationMessages is valid.

Functions

open suspend override fun collect(collector: FlowCollector<X>)

fun Listener<*, HTMLInputElement>.files(): Flow<FileList?>

Extracts a FileList from the Event.target.

fun Listener<*, HTMLSelectElement>.selectedIndex(): Flow<Int>

Extracts the HTMLSelectElement.selectedIndex from the Event.target.

fun Listener<*, HTMLSelectElement>.selectedText(): Flow<String>

Extracts the HTMLOptionElement.text from the selected HTMLOptionElement.

fun Listener<*, HTMLSelectElement>.selectedValue(): Flow<String>

Extracts the HTMLOptionElement.value from the selected HTMLOptionElement.

fun Listener<*, HTMLInputElement>.states(): Flow<Boolean>

Extracts the HTMLInputElement.checked state from the Event.target.

fun Listener<*, HTMLFieldSetElement>.values(): Flow<String>

fun Listener<*, HTMLInputElement>.values(): Flow<String>

Extracts the HTMLInputElement.value from the Event.target.

fun Listener<*, HTMLSelectElement>.values(): Flow<String>

Extracts the HTMLSelectElement.value from the Event.target.

fun Listener<*, HTMLTextAreaElement>.values(): Flow<String>

Extracts the HTMLTextAreaElement.value from the Event.target.

fun <T> Flow<T>.whenever(condition: Flow<Boolean>): Flow<T?>

This extension method takes a boolean Flow that controls the forwarding of an initial flow: If it is true the current value will be passed further on the result flow, if it is false a null will appear instead.