Intercepting Polymer events

Question

To intercept browser event one can write something like this:

<input type="radio" onChange="alert('on change!')">

What would be the easiest way to intercept POLYMER component event? Like this one:

 <paper-radio-button   on-iron-change="alert('on-iron-change!!')" />

Thank you!

Answer 1

<paper-radio-button   on-iron-change="someFunctionOnTheCustomElement" />

otherwise you can imperatively add an event listener

document.querySelector('paper-radio-button')
    .addEventListener('iron-change', (e) { alert('on-iron-change'); }