There is a form with a checkbox. Here the data from the database - areas.

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And there is also a form with a checkbox with zones of these areas.

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Between the tables are connected by key. And such a query finds zones that correspond to the desired area.

<?= $form->field($objects, 'options_zones_cities')->checkboxList(ArrayHelper::map(\common\models\zones\CityRegionsZone::find() ->where(['city_region_id' => '86']) ->all(), 'id','name'))->label('Зоны районов Одессы') ?>

Here you need to substitute the necessary id - each zone has a district id

The ids themselves are in option

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How do I get the id of the selected area, then show the zones that correspond to them (upon request). The ajax form itself, i.e. id, you can choose dynamically

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Here 86.87 is the id of the selected items.

The question is how to use js - 1) to get id 2) to transfer id to request 3) to show zones, according to districts (upon request)

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