How to use JSON to fill a text field?

Hi all,

We are still using OTRS 3.0. 
I want to fill TicketFreeText5 (a text field) with the phone number of the building selected in TicketFreeText6 (a select with all our possible locations).

In AgentTicketPhone.dtl, I’ve added (after dtl:block:TicketFreeText):
<!--dtl:js_on_document_complete-->
<script type="text/javascript">//<![CDATA[
    $('#TicketFreeText6').bind('change', function (Event) {
        Core.AJAX.FormUpdate($('#NewPhoneTicket'), 'BuildingAJAXUpdate', 'TicketFreeText6', ['TicketFreeText5']);
    });
//]]></script>
<!--dtl:js_on_document_complete-->

In AgentTicketPhone.pm, I’ve added the Subaction 'BuildingAJAXUpdate'. It succesfully retrieves the phone number of the building, but fails when it has to response the AJAX call. I’ve tried two ways:

- First, I tried using Layout->JSONEncode:
    $JSONContent = $Self->{LayoutObject}->JSONEncode( 
        Data => {
            TicketFreeText5 => $BuildingData{Phone},
        }
    );

- Second, I tried using Layout->BuildSelectionJSON (it isn’t a select field, but I’ve seen it used in such cases [although can’t remember where]):
    $JSONContent = $Self->{LayoutObject}->BuildSelectionJSON(
        [
            {
                Name         => 'TicketFreeText5',
                Data         => $BuildingData{Phone},
                SelectedID   => $BuildingData{Phone},
            },
        ]
    );

Either way, the JSON string sent was {"TicketFreeText5":"3"}, being 3 the phone number. So I though everything was ok, but the web broser showed ‘TicketFreeText5’ instead of ‘3’ in the text field.

Anybody can help me to correctly fill a text field using AJAX?

Kind regards,
Juan Clavero

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