Nativescript在TextField上检测焦点更改-背后的代码

Question

So I am creating a textField through code behind in Nativescript Javascript.

I wanna create an event so when the focus on a field changes I can detect it.

I have tried:

textFieldName.focus = "onFocus";

function onfocus(args){
    console.log("Ping");
}

But nothing happens.

How do I bind the focus event through javascript, so I can detect when a field gets focus and loses focus?

Thanks

Answer 1

You have use addEventListener / on to add listener and removeEventListener / off to remove a listener.

textFieldObj.on(textFieldModule.focusEvent, onFocusFn);

Here are the docs .