If the resources are included, a separate call like this will work (form onShow event probably):
plugins.WebClientUtils.executeClientSideJS('jQuery(function($){ $("#date").mask("99/99/9999",{placeholder:"dd/mm/yyyy"}); })')
If you wrap this in a function in the html:
'<html>\
<head>\
<script src="http://twitter.github.io/typeahead.js/js/jquery-1.10.2.min.js"></script>\
<script type="text/javascript" src="http://digitalbush.com/wp-content/uploads/2014/10/jquery.maskedinput.js"></script>\
<script type="text/javascript" src=\'http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js\'></script>\
<script>\
function maskApply() {\
jQuery(function($){\
$("#date").mask("99/99/9999",{placeholder:"dd/mm/yyyy"});\
});\
}\
</script>\
</head>\
<body>\
<input id="date" tabindex="1" type="text">\
</body>\
</html>'
This this is how you trigger the client-side function:
plugins.WebClientUtils.executeClientSideJS('maskApply()')
You don’t need to include jquery as Servoy already has it. Just need the jquery UI and masked input resources.