[6.1] Support class and additional attribute for optgroup

[HLeithner]

Summary of Changes

Allow to add class attribute and additional attributes to select.groupedlist htmlhelper.
This allows the optgroup the same attributes like select.options

Testing Instructions

create a HTMLHelper::_('select.groupedlist'); which includes group.class and group.attr entries.

Example:

$data = [];
$data[0]['items'][''] = Text::_('JSELECT');
$data['group1'] = [
  'label' => 'I'm group 1',
  'items' => [
    'value1' => 'text1',
    'value2' => 'text2',
  ]
  'class' => 'niceclass',
  'attr' => 'data-additional="information"'
];

echo \Joomla\CMS\HTML\HTMLHelper::_('select.groupedlist', $data, 'testname' , [
  'group.items' => 'items',
  'group.label' => 'label',
  'group.class' => 'class',
]);

Actual result BEFORE applying this Pull Request

<select name="testname">
  <option value="" selected="selected">Auswählen</option>
  <optgroup label="I am group 1">
    <option value="value1">text1</option>
    <option value="value2">text2</option>
  </optgroup>
</select>

Expected result AFTER applying this Pull Request

<select name="testname">
  <option value="" selected="selected">Auswählen</option>
  <optgroup label="I am group 1" class="niceclass" data-additional="information">
    <option value="value1">text1</option>
    <option value="value2">text2</option>
  </optgroup>
</select>

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[dgrammatiko]

@HLeithner although this is nice enhancement it falls quite sort for the upcoming (already available in the chromium supported browsers) <select> changes:
Docs: whatwg/html#10548

Video: https://www.youtube.com/shorts/6yFm0BLI2hk

[HLeithner]

I like it @dgrammatiko but I think we are not there yet https://caniuse.com/selectlist (all read and behind feature flag) since 2022.

Anyway we would need another approach for this kind of customization, maybe finally a layout for the htmlhelper.select.xxx but I think we will not be the first supporting this ;-)

[VaishnaviSidral]

I have tested this item ✅ successfully on 5dd1b89

I tested this issue, and it was tested successfully.

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[nadjak77]

I have tested this item ✅ successfully on 5dd1b89

There are two faults in the example data:

• the ' has to be escaped in "I'm group 1"
• in line 8 is a missing , after the ]

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[hamby]

I have tested this item ✅ successfully on 5dd1b89

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[tecpromotion]

RTC

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[bembelimen]

Thanks