Permanently resets the title associated with a view in a Sencha Touch Navigation View.

changeTitleInNavigationView.js

/*
DESCRIPTION
===========

Permanently resets the title associated with a view in a Sencha Touch
Navigation View.

USAGE
=====

	Ext.changeTitleInNavigationView(navView, container, newTitle);

Where:

* navView = a reference to the Navigation View
* container = a reference to the view whose title you want to change
* newTitle = the new title of the view

CAVEATS
=======

If calling navView.pop() and Ext.changeTitleInNavigationView() in the
same function, call Ext.changeTitleInNavigationView() before navView.pop().
There is some sort of race condition if you call navView.pop() first.

LICENSE
=======

This is free and unencumbered software released into the public domain.
 
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
 
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
 
For more information, please refer to <http://unlicense.org/>
*/

Ext.changeTitleInNavigationView = function(navView, container, newTitle){
	// Compute the index of the container in the navView
	var innerItems = navView.getInnerItems(),
		index = 0;
	for (; index<innerItems.length; index++) {
		if (innerItems[index] === container) {
			break;
		}
	}

	// Make sure the navView contains the container
	if (index === innerItems.length) {
		if (Ext.Logger) Ext.Logger.warn("Ext.changeTitleInNavigationView: Given container is not in the given navigation view.")
		return;
	}

	// Change the title in the internals of the navigation bar (this is the magic line)
	navView.getNavigationBar().backButtonStack[index] = newTitle;

	// Save the title in the container for good measure
	if (container.setTitle) {
		container.setTitle(newTitle);
	} else {
		container.title = newTitle;
		container.config.title = newTitle;
	}

	// Change the displayed title if necessary
	if (index === innerItems.length - 1) {
		navView.getNavigationBar().setTitle(newTitle);
	}
};