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  6. extendFieldsBefore

backend.form.extendFieldsBefore

Triggered in Backend\Widgets\Form.

Called before the form fields are defined

Example usage:

Event::listen('backend.form.extendFieldsBefore', function ((\Backend\Widgets\Form) $widget) {
    // You should always check to see if you're extending correct model/controller
    if (!$widget->model instanceof \Foo\Example\Models\Bar) {
        return;
    }

    // Add a new field named example_field
    $widget->addField('example_field', [
        'label' => 'Example field',
        'comment' => 'Your example field',
        'type' => 'text'
    ]);
});

Or

$formWidget->bindEvent('form.extendFieldsBefore', function () use ((\Backend\Widgets\Form $formWidget)) {
    // You should always check to see if you're extending correct model/controller
    if (!$widget->model instanceof \Foo\Example\Models\Bar) {
        return;
    }

    // Add a new field named example_field
    $widget->addField('example_field', [
        'label' => 'Example field',
        'comment' => 'Your example field',
        'type' => 'text'
    ]);
});