dynamic dropdown get in zf2? - zend-framework2

Question

I want to put a dropdown in my project which is made in zf2... I wasted all day but I only got a static dropdown, not dynamic. Can anyone help me with this problem??
UserForm.php
$this->add(array(
'name' => 'group_name',
'type' => 'select',
'attributes' => array(
'id'=>'group_name',
'class'=>'large',
'options' => array('1=>php','2'=>'java'),
),
'options' => array(
'label' => '',
),
));
Thanks in advance for your valuabe answer.

Answer 1

Try this:
$this->add(array(
'name' => 'group_name',
'type' => 'select',
'attributes' => array(
'id'=>'group_name',
'class'=>'large',
),
'options' => array(
'label' => '',
'value_options' => array(
'1' => 'php',
'2' => 'java'
),
),
));

Answer 2

This is what i did:
In my constructor for my form
$this->add(array(
'type' => 'Zend\Form\Element\Select',
'name' => 'color',
'options' => array(
'empty_option' => 'Select a Color',
'value_options' => self::getColors(),
'label' => 'Color',
),
));
In the form class yet, i created this method:
public static function getColors() {
// access database here
//example return
return array(
'blue' => 'Blue',
'red' => 'Red',
);
}
In my view script:
<div class="form_element">
<?php $element = $form->get('color'); ?>
<label>
<?php echo $element->getOption('label'); ?>
</label>
<?php echo $this->formSelect($element); ?>
</div>

Answer 3

Think about it from a abstract level.
You have one Form
The Form needs Data from the outside
So ultimately your Form has a Dependency. Since we've learned from the official docs, there's two types of Dependency-Injection aka DI. Setter-Injection and Constructor-Injection. Personally(!) i use one or the other in those cases:
Constructor-Injection if the dependency is an absolute requirement for the functionality to work
Setter-Injection if the dependencies are more or less optional to extend already working stuff
In the case of your Form, it is a required dependency (because without it there is no populated Select-Element) hence i'll be giving you an example for Constructor-Injection.
Some action of your controller:
$sl = $this->getServiceLocator();
$dbA = $sl->get('Zend\Db\Adapter\Adapter');
$form = new SomeForm($dbA);
That's all for the form. The population now happens inside your Form. This is only an example and may need some fine-tuning, but you'll get the idea:
class SomeForm extends \Zend\Form
{
public function __construct(\Zend\Db\Adapter\Adapter $dbA)
{
parent::__construct('my-form-name');
// Create all the form elements and stuff
// Get Population data
$popData = array();
$result = $dbA->query('SELECT id, title FROM Categories', $dbA::QUERY_MODE_EXECUTE)->toArray();
foreach ($result as $cat) {
$popData[$cat['id'] = $cat['title'];
}
$selectElement = $this->getElement('select-element-name');
$selectElement->setValueOptions($popData);
}
}
Important: I HAVE NO CLUE ABOUT Zend\Db the above code is only for how i think it would work going by the docs! This is the part that would need some optimization probably. But all in all you'll get the idea of how it's done.

Answer 4

In your controller you can do something like below;
On my first example assuming that you have a Group Table. Then we're going to fetchAll the data in group table;
We need the id and name to be display in select options;
public function indexAction()
{
$groupTable = new GroupTable();
$groupList = $groupTable->fetchAll();
$groups = array();
foreach ($groupList as $list) {
$groups[$list->getId()] = $list->getName();
}
$form = new UserForm();
$form->get('group_name')->setAttributes(array(
'options' => $groups,
));
}
OR
in this example the grouplist is hardcoded;
public function indexAction()
{
$groupList = array('1' => 'PHP', '2' => 'JAVA', '3' => 'C#');
$groups = array();
foreach ($groupList as $id => $list) {
$groups[$id] = $list;
}
$form = new UserForm();
$form->get('group_name')->setAttributes(array(
'options' => $groups,
));
}
Then in your view script;
<?php
$form = $this->form;
echo $this->formRow($form->get('group_name'));
?>
Or you can right a controller helper, you may check this link http://www.resourcemode.com/me/?p=327

Answer 5

Just came across the same problem and had to take a look into zf2 source.
Here's a more OOP solution:
Inside the form constructor:
$this->add(array(
'name' => 'customer',
'type' => 'Zend\Form\Element\Select',
'attributes' => array(
'options' => array(
0 => 'Kunde',
)
),
'options' => array(
'label' => 'Kunde'
)));
inside the controller:
$view->form = new SearchForm();
$customers = $view->form->get('customer')->getValueOptions();
$customers[] = 'Kunde1';
$customers[] = 'Kunde2';
$customers[] = 'Kunde3';
$customers[] = 'Kunde4';
$view->form->get('customer')->setValueOptions($customers);