Sometimes I need the "change" event to be triggered even when elements that are not changed directly by the user, this works good so far.

detect_remote_change.js

var t = 200;    // The interval at which new change ares detected

jQuery( document ).ready( function() {
	// Detect remote change
	$( 'input, textarea' ).each( function() {
		var $this = $( this );
		$this.data( 'value', $this.val() );
		setInterval( function() {
			if( $this.val() !== $this.data( 'value' ) ) {
				// Do not trigger if element does not have focus
				if( $this.not( ':focus' ) ) {
					$this.change();
				}
				$this.data( 'value', $this.val() );
			}
		}, t );
	} );
} );