jQuery - trigger not produce the expected result

Question

In my app, while page load i initiate my init function for 3 things,

1. trigger and sending a page no. (i would like to pass page default as 1)

Answer 1

It's because you lose the this context. jQuery passes the DOM element as the context, not whatever the original context was.

You need to bind the context of the function to your existing this:

$(document).on("newMessage", this.onPageChange.bind(this));