Refactor: navigation.js A4.1 extensibility

List of triggers fired by jquery.mobile.navigation.js @ A4.1

In function transitionPages() definition:

• from.data( "page" )._trigger( "beforehide", null, { nextPage: to } ); on L447
• to.data( "page" )._trigger( "beforeshow", null, { prevPage: from || $( "" ) } ); on L449.
  Notes
• These two triggers are co-located and occur essentially at the same juncture.
• It's widely agreed that the beforeshow trigger, implementation-named pagebeforeshow via the widget factory, needs to be moved until the page is, in fact, right before show.

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In function pageChangeComplete() definition:

• from.data( "page" )._trigger( "hide", null, { nextPage: to } ); on L482
• to.data( "page" )._trigger( "show", null, { prevPage: from || $( "" ) } ); on L485.

Notes

• These two triggers are co-located and occur essentially at the same juncture.

List of clear junctures in jquery.mobile.navigation.js @ A4.1

Because extensibility needs to happen an logical junctures to be effective, at predictable junctures to be developer-friendly.