Saving AJAX Fields

Hi all together,

i have a problem and i don´t know how i can solve this.
in a form i have a select box. when i select one of this values, ajax will get the requested data over the "data_interface.ctp" the values are vissible and clickable.
But i can´t save the checkboxed values...

Here´s my code

edit.ctp

$select_value = array();
$select_value[null] = '-- Keine Auswahl --';
foreach($places as $place) {
    $key     = $place['Place']['id'];
    $value   = $place['Place']['stadt'];
    $select_value[$key]    = $value;
}
$mydata = $this->data;
if (  $mydata['Event']['place_id'] != null ) {
    foreach ( $select_value as $k => $v ) {
        if ( $mydata['Event']['place_id'] == $k ) {
            $this_is_selected =  $k;
        }
    }
} else {
$this_is_selected = 0;    
}
echo $this->Js->Form->select('place_id', $select_value);
echo $this->Js->writeBuffer();

echo $this->Html->div(null, '', array('id' => 'target-div')); ?>

...

<script typ="text/javascript">
    $("#EventPlaceId").click(function(){
        var selectedValue = $("#EventPlaceId").val();
        $.get("/events/data_interface/"+ selectedValue,
        function(data) {
            $('#target-div').fadeOut("fast", function() {
                $('#target-div').html(data);
                $('#target-div').fadeIn("fast");
            });
        });
        return false;
    });
</script>
 

data_interface.ctp

$select_value = array();       
    foreach($locations as $location) {
        $key    = $location['Location']['id'];
        $value  = $location['Location']['name'];
        $select_value[$key]    = $value;
    }
    echo $this->Form->select('location_id', $select_value, array('label'=> false, 'multiple' => 'checkbox'));
 

EventsController.php

public $helpers = array('Js' => array('Jquery'));
public $components = array('RequestHandler');
...
public function data_interface($place_id) {
    $locations = $this->Event->Location->findAllByPlaceId($place_id);
    $this->set('locations', $locations);
}
 

When i click on the "Save" button, cake stores all data without "location_id" to the events table.
But how can I teach cake to store the values​​, which are set for "location_id" ?

Any ideas ?

Nice Greetings and thanks for help

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