Capitalise validatebox in datagrid

[vid]

Hi Guys
I want to configure a validatebox in a datagrid so that all entries are capitalised. How does one do that?
The table column is defined using:

<th field="entity_code" width="50" editor="{type:'validatebox',options:{required:true}}">Code</th>

What do I add for capitalisation?
Many thanks

[jarry]

You should extend new validation rules and then apply them to your code. Please refer to https://www.jeasyui.com/documentation/validatebox.php

[vid]

Thanks jarry but this would display an error if lowercase letters were entered. I would like lowercase to be automatically capitaised.