jquery - Html include another Html with onclick javascript is not working after page load

For example, Having 1st Page HTML Include header Page HTML

Page 1 javascript

Header page

Booking


    
New Booking
    
Cancellation
    
My Booking

So my problem is, in my header page HTML I having a menu drop-down-list. During the page is loading, I am able to click the menu to drop down the list. Once the page is complete loaded to the page 1, the menu is malfunctioned and not response after I click.