How to use pageinit correctly?

I have a single file for each page and i am trying to implement the pageinit event handler on every page (I think what belongs strictly to one page, should be declared there) as shown below:

<body>
    <div id="myPage" data-role="page">
        <!-- Content here -->
        <script type="text/javascript">
            $("#myPage").live('pageinit', function() {
                // do something here...
            });
        </script>
    </div>
</body>

The event is bound properly to the page, so the code is executed but - now my problem - if i go to another page and return later on the pageinit event will be executed twice. I think that is because the .live method binds the pageinit event again to the page. But shouldn't the pageinit event only called once at page initialization? What I am missing here?

Solution

I think its probably best to move your JavaScript code into another file as while your navigating around your site jQuery Mobile may cleanup (read: delete from DOM) that myPage page and therefore will have to load it in again and hense rerun that same block of code you defined and bind 2 listeners for the pageinit event.

Thats basically why they suggest using the live or on functions however it falls over if you include the binding code on the page ;)

However if you insist on having your code placed on a per page basis than use bind instead of live.

Ref: http://jquerymobile.com/demos/1.0/docs/pages/page-cache.html

jQuery Mobile therefore has a simple mechanism to keep the DOM tidy. Whenever it loads a page via Ajax, jQuery Mobile flags the page to be removed from the DOM when you navigate away from it later (technically, on the pagehide event).