JSFiddle - React, Tailwind, and code Playground

HTML

<select id="BrandNames">
   <option value="3001">KFC</option>
</select>

JavaScript

$(document).on('change', 'select#BrandNames', function(event) {
    
    alert('hii');
   
});

// 1
$('select#BrandNames').trigger('change');

// 2
//var event = jQuery.Event('change');
//event.target = $(document).find('select#BrandNames').get(0);
//$(document).trigger(event);