Allow_Remove doesn't remove the collection - php

Question

I'm setting a fieldset (collection) in my form, and i want allow add and remove elements.. So, my code is:
$hydrator = new Hydrator($this->getObjectManager(), 'Base\Entity\MyElements');
$fieldset = new MyElements();
$fieldset->setObjectManager($this->getObjectManager())
->setHydrator($hydrator)
->setObject(new \Base\Entity\MyElements())
->init();
$this->add(array(
'type' => 'Zend\Form\Element\Collection',
'name' => 'myElements',
'options' => array(
'label' => 'My Elements',
'count' => 1,
'should_create_template' => true,
'allow_add' => true,
'allow_remove' => true,
'target_element' => $fieldset
)
));
I can add elements, but, the remove button doesn't appear.. I'm doing wrong or forgetting something?
PS: My english is very poor, but i'm trying improve it. Sorry. And thanks

Answer 1

The allow_remove option doesnt add the button directly. Remeber that the allow_add also does not add the button. As you can see in the docs you have to add the button
<button onclick="return add_category()">Add a new category</button>
and the js function to add elements:
<script>
function add_category() {
var currentCount = $('form > fieldset > fieldset').length;
var template = $('form > fieldset > span').data('template');
template = template.replace(/__index__/g, currentCount);
$('form > fieldset').append(template);
return false;
}
</script>
exactly as this, you have to add the remove button
<button onclick="return remove_category()">Remove</button>
and the function:
<script>
function remove_category() {
//write your logic to remove the last, or the current element, for isntance:
$('form > fieldset > fieldset').last().remove();
return false;
}
</script>