JSFiddle - React, Tailwind, and code Playground
HTML
<div id='main'>
<div data-id='2'>
</div>
<div data-id='3'>
</div>
</div>
JavaScript
var available_services = [];
$('#main [data-id]').each(function() {
available_services.push($(this).attr('data-id'));
});
console.log(available_services);