Easy Profile - Joomla Extension

Yes, but it is not so simple.

You can fill hidden field by creating a simple plugin:
- Download, Install and Enable Skeleton Plugin (you will find it at http://docs.easy-profile.com/index.php/article/triggers)
- Open file /plugins/jsn/skeleton/skeleton.php
- Remove samples functions: triggerFieldAvatarUpdate, triggerProfileUpdate
- add function like this:

public function triggerProfileUpdate($user, &$data, $changed, $isNew)

{

    $data[ 'search' ] = $data[ 'field1' ] . ' ' . $data[ 'field2' ] . ' ' . $data[ 'field3' ] ;

}

Something like this can work with Text, Textarea, Phone, Email....BUT....
problem 1
Fields like checkboxes, select and radio store value and not text in DB, so for example for a field like radio you have these options:
opt1|Art
opt2|Music
then $data[ 'radio_field' ] is equal to opt1 or opt2 and not equal to Art or Music
problem 2
Fields like checkboxes or select (with multiple value enabled) store values in JSON format, so you need to decode values in a first step

Is it possible to fill in a hidden custom field bij several other custom fields.

I want to add a hidden field with name 'search'

than fill this field with 'Field a' + 'Field b' + 'Field c', so with this workaround I can do a search on all te data.

Hi,
Easy Profile Search module allow you to search by a Hidden custom field type

Is it otherwise possible to search a hidden field?

Sorry, but Easy Profile does not have this feature.