datePicker not working when not logged as an admin

I have been building a website that requires a datepicker field.
I added this to my view file
<?php echo Core::make('helper/form/date_time')->date('claimdate', $date_field); ?>

Tested it and all worked well,

Logged out and back in as a non-admin user only to find that the datepicker has stopped working. After some digging and dropping the one line of code into a test site running
elemental I came across this error in firebug

TypeError: $(...).datepicker is not a function

By making the user am administrator the datepicker worked again and when a user again it stopped.
I have checked that JQuery is loading, that it is declared in registerAssets.
I can see jquery is loaded in firebug.
So now I am at a loss as to why this is happening, any suggesting most welcome

This is running on a ubuntu 1404 server, using nginx and running C5.7.4.2 with no other add-ons on the page.


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WillemAnchor replied on at Permalink Reply
Is that bit of javascript your own, or generated ?

if so, try it within a $(document).ready()
FaganSystems replied on at Permalink Reply
HI I wish I could say, hey yes you are right , yes a great idea but sadily, I have only contributed the one line of php to create the datepicker, everything else is part of the core product.

I have a gut feeling its permissions somewhere but I am at a loss as to where
MrKDilkington replied on at Permalink Best Answer Reply

I think the core date picker might require jQuery UI.

If so, you can try requiring it in your page_theme.php:
- in registerAssets()
$this->requireAsset('javascript', 'jquery/ui');
FaganSystems replied on at Permalink Reply
@MrKDilkington You are spot on, I added

$this->requireAsset('css', 'jquery/ui');
$this->requireAsset('javascript', 'jquery/ui');

into the page_theme.php of the elemental theme and the datepicker started working again

Thank you for your help