Item Model

protected function preprocessForm(JForm $form, $data, $group = 'examplegroup')
    foreach ($data as $i => $item) {
        $field = new \SimpleXMLElement('<field />');
        $field->addAttribute('name', 'sample[' . $i . ']');
        $field->addAttribute('class', 'input-mini');
        $field->addAttribute('type', 'number');
        $form->setField($field, 'data');
        $form->setValue('sample[' . $i . ']', 'examplegroup', $item->fieldname);


<?php foreach ($this->items->data as $i => $item) : ?>
<?php echo $this->form->getInput('sample[' . $i . ], 'examplegroup'); ?>


<input type="number" name="jform[examplegroup][sample[0]]" value="6" class="input-mini">

How can I achieve getting this kind of name name="jform[examplegroup][sample][0]" ? The form needs to be generated dynamicaly and not by writing the name static into the code.


I found a solution that seams to work.

Creating the Form without the usual jform control class like this:

// $form = $this->loadForm('my_comp.examplegroup', 'examplegroup', array('control' => 'jform', 'load_data' => $loadData));
$form = $this->loadForm('my_comp.examplegroup', 'examplegroup', array('control' => '', 'load_data' => $loadData));

Then creating the fields dynamicaly with the whole name:

protected function preprocessForm(JForm $form, $data, $group = 'examplegroup')
$field = new \SimpleXMLElement('<field />');
$field->addAttribute('name', 'jform[' . $i . '][sample]');
$form->setValue('jform[' . $i . '][sample]', '', $item['sample']);
  • Undeclared variables: $i, $item['sample']. (Remember, people might be copy-pasting this stuff.) – mickmackusa Oct 2 '19 at 20:03
  • You can see at my questions that its an abstract snippet. People copy-pasting this would not understand it in the first place. – Mike Oct 2 '19 at 21:21
  • Oh, I understand completely, but other people may get tripped up. The WHOLE IDEA behind "sharing knowledge" on Stack Exchange sites is to educate and empower others -- not posting snippets that need to be decyphered. Researchers come from different experience levels and don't want to solve a second issue to solve their first one. There is no harm in either: 1. including the foreach loop declaration or 2 removing the method declaration or 3. Putting ... where the foreach line is for clarity's sake. – mickmackusa Oct 2 '19 at 21:22

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