Question

I have search a lot and found several methods about how to call page specific javascript with external files.

The best method i found is call one-line function in HTML page like

frontEnd.ContactPageLoad();

But this requires to have in-page javascript..

Other method is to have an id /attribute at body or at <script> tag and this to call what you want.

What should i do for this case?

EDIT
This is what i want..
http://paulirish.com/2009/markup-based-unobtrusive-comprehensive-dom-ready-execution/

Answer 1

According to the way you formulated your question :

how can js know where it should start?

Javascript is a scripting langage , it means it will evaluate line by line everything written in a script.

so if you put myFunction() at the beginning or the end of a file it doesnt matter , provided myFunction is defined. nothing requires to have javascript inside your html except a few framework perhaps.

write a a script called myscript.js then put a script tag in your html page :

<script src='myscript.js' type='text/javascript></script>

have you tried this ?