On select of option dynamicaly fetch data from DB and populate in a dropdown

Hi there,

I'm pretty new to CakePHP. I have a drop down menu, in which the data
comes from DB. Following is the code for that.
In Controller file
function step_one(){
$suppliers = $this->Supplier->find('all', array('fields' =>
'Supplier.name'));
$this->set('suppliers',$suppliers);

}
View file

$a = array();
$i=1;
foreach( $suppliers as $supplier ):
$a[$i] = $supplier['Supplier']['name'];
$i++;
endforeach;
echo $form->input('Supplier ', array('options' => $a));

This creates a drop down menu. On change I want to have another drop
down in which the data is fetched from DB.

Thanks In advance
:)

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