Dynamic drop down box change depend on database in CakePHP - php

Question

I am new to CakePHP, the problem is I need to create the dynamic values to drop down box the values which are come from mysql.the following is code which i used in controller:
$wires = $this->wire->find('all',array('conditions'=>array('wire_id'=>$wire_id)));
foreach($wires as $key=>$gs) {
$options[$gs['wires']['type_of_wire']] = $gs['wires']['type_of_wire'];
$options1[$gs['wires']['length']] = $gs['wires']['length'];
$options2[$gs['wires']['color']] = $gs['wires']['color'];
}
In ctp
echo $this->Form->input('wire', array('type' => 'select', 'class'=>'dropdn', 'options'=> $options, 'selected'=> $options, 'div'=>false, 'label'=>false,'id'=>'metal'));
echo $this->Form->input('wire', array('type' => 'select', 'class'=>'dropdns', 'options'=> $options1, 'selected'=> $options, 'div'=>false, 'label'=>false,'id'=>'metal'));
echo $this->Form->input('wire', array('type' => 'select', 'class'=>'dropdned', 'options'=> $options1, 'selected'=> $options, 'div'=>false, 'label'=>false,'id'=>'metal'));
Here I create three drop down boxes, but the problem is if I changed the drop down box value type of wire means its dynamically change its correct length and color for rest of the drop down box.
I also tried it ob onchange but I can't.

Answer 1

Use AJAX calling for dynamic drop down list. something like this in your layout/ where you have jquery defined..
$('#metal').change(function() {
var wire= $(this).val();
$.ajax({
type: "POST",
url: "HERE GIVE URL TO YOUR ACTION WHERE YOU FETCH DATA FROM TABLE",
data: { wire: wire , submit: "submit" },
success: function(result){
$("#metal").html(result);
}
});
});
})
Then in your controller, action for ajax call--
public function get_wires()
{
$this->autoRender=false;
$value=$_POST['wire'];
$wire_length = $this->wire->find('list',array('fields' => array('wire_length'),'conditions' => array('wire'=>$value)));
foreach($wire_length as $q)
{
$data[]="<option>".$q."</option>";
}
print_r($data);
}
Then post this value you get into your form in view.ctp page.