Additional attributes in select options - php

Question

In createForm.php I have code:
$this->add([
'type' => Element\Select::class,
'name' => 'subcategory_id',
'options' =>[
'label' => 'Subcategory',
'empty_option' => 'Select...',
'value_options' => $subcategoriesTable->fetchAllSubcategories(),
],
'attributes' => [
'required' => false,
'class' => 'custom-select',
],
]);
In SubcategoriesTable.php
public function fetchAllSubcategories()
{
$sqlQuery = $this->sql->select()->order('sub_name ASC');
$sqlStmt = $this->sql->prepareStatementForSqlObject($sqlQuery);
$handler = $sqlStmt->execute();
$row = [];
foreach($handler as $tuple){
$row[$tuple['subcategory_id']] = $tuple['sub_name'];
}
return $row;
}
And generated records from my database to my form:
<option value="1">Name1</option>
How I can change my code for making additional attribute like this?
<option value="1" data-chained="parent_name">Name1</option>
parent name value is from another select. Also generated in the same way.

Answer 1

You'll have to make a few changes.
Inside SubcategoriesTable, you'll have to retrieve the parent's name (I used parent_name as key, since we don't know what the exact column's name..):
public function fetchAllSubcategories()
{
$sqlQuery = $this->sql->select()->order('sub_name ASC');
$sqlStmt = $this->sql->prepareStatementForSqlObject($sqlQuery);
$handler = $sqlStmt->execute();
$row = [];
foreach($handler as $tuple){
$row[$tuple['subcategory_id']] = [
'sub_name' => $tuple['sub_name'],
'parent_name' => $tuple['parent_name']
];
}
return $row;
}
Then, in CreateForm:
$valueOptions = [];
foreach($subcategoriesTable->fetchAllSubcategories() as $subcategoryId => $subcategory){
$valueOptions[] = [
'value' => $subcategoryId,
'label' => $subcategory['sub_name'],
'attributes' => [
'data-chained' => $subcategory['parent_name']
]
];
}
$this->add([
'type' => Element\Select::class,
'name' => 'subcategory_id',
'options' =>[
'label' => 'Subcategory',
'empty_option' => 'Select...',
'value_options' => $valueOptions,
],
'attributes' => [
'required' => false,
'class' => 'custom-select',
],
]);
Re-reading your question, I saw that you need this value for another select. I suggest you to add parent's ID instead of parent's name, it would be easier to handle thing.
As exemple:
public function formAction() {
$subcagetoryForm = new Form();
$subcagetoryForm->add([
'type' => Select::class,
'name' => 'subcategory_id',
'options' => [
'label' => 'Subcategory',
'empty_option' => 'Select...',
'value_options' => [
[
'value' => 1,
'label' => 'Name 1',
'attributes' => [
'data-chained' => 'parent 1'
]
],
[
'value' => 2,
'label' => 'Name 2',
'attributes' => [
'data-chained' => 'parent 2'
]
]
],
],
'attributes' => [
'required' => false,
'class' => 'custom-select',
],
]);
return [
'subcagetoryForm' => $subcagetoryForm
];
}
In the view:
<?= $this->formElement($this->subcagetoryForm->get('subcategory_id')); ?>
Result:
[]
However, I'll suggest you to create a custom element to remove all this logic from the form. The custom element will be helpful if you'll need it inside another form. You can take a look at this question