Why is .on('load', function () { not working for a button?

Question

Working .on('click'

There is no problem.

myApp.onPageAfterAnimation('about', function (page) {
$$('#button1').on('click', function () {
alert('test');

---

Not Working .on('load'

Why?

myApp.onPageAfterAnimation('about', function (page) {
$$('#button1').on('load', function () {
alert('test');

Answer 1

onload event only supported HTML tags:

body, frame, iframe, img, input type="image", link, script, style