Page not loading correctly via jQuery .load()

Source page is prelist_plan_levels.html, (see attached).
The link in source page:

<a href="/cmdb/public_html/Work/list_plan_levels.html" class="UpDowngrade" data-target="center_body" data-pp="Nov 2015" data-scope="PP" data-updown="UP">25</a>

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NOTE that there are 3 of these links in the page, each with different 'data-key="value"' parameters, ALL containing data-target.

Source page .ready() function is review_plan_levels(), containing event catcher

$('body').one( "click", 'a.UpDowngrade', listPlanLevelsClick ) ;

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Destination page list_plan_levels.html, (see attached).

JS listPlanLevelsClick() function is also attached.

ISSUES:
I've tried two variations of function listPlanLevelsClick(event), the one shows unsuccessfully tries to rely on 'data-target="blah"', but the page does not load in the designated DIV in my web app.  It loads in the entire window.  (See also index.html.)
When it does load, it will correctly perform the commented-out .DataTable() load.

The other variation of this function is to use the commented-out code to force loading into the DIV I desire.
It does target correctly then, but:
A) The success callback never alerts me (an issue?)
B) More importantly, even with a minimal DataTable() configuration, in the console I'm seeing

Uncaught TypeError: $(...).DataTable is not a function

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All the cdn.datatables.net  JS and CSS links were fresh as of last week.  Again, it does load a table w/ data when it incorrectly places it in the entire window.

Add'l confusion but not an issue:
Also, you'll note that I'm using  

$('body').one( "click", 'a.UpDowngrade', listPlanLevelsClick ) ;

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rather than .on(), because for some reason, maybe you'll understand why, each failed load (when correctly targeted) would retain the click, because subsequent clicks would repeatedly call listPlanLevelsClick(), once for every prior click.

See also http://plnkr.co/edit/oyaHJhYFT8hrz0UcKPR0?p=preview.  That may help, I believe it's public.

Thank you,
Ralph
prelist_plan_levels.html
list_plan_levels.html
list_plan_levels--.txt
listPlanLevelsClick--.txt
index.html