What would be the semantically equivalent syntax in typescript to the following line in javascript
// Some knockout event handler
myFunc(data: string, evt: Event) {
// If enter or tab key up were detected add the excuse to the collection
if (evt.enterKey || evt.which == 9) {
// Do Something
}
}
The trouble I'm having here is unlike regular javascript event, typescript Event class does not have a property enterKey or which. So how do I detect which key is being pressed without getting typescript compile error and the ugly red wiggly underline?
You need to use the more specialised event type KeyboardEvent, as shown below:
myFunc(data : string, evt : KeyboardEvent)
If you want to also remove errors for evt.enterKey you'll need to add it by extending the interface - although I'm not aware that this is a real property as it isn't technical a control key, like CTRL, SHIFT or ALT, which all have properties on the event:
interface KeyboardEvent {
enterKey: boolean;
}