JSFiddle - React, Tailwind, and code Playground

by userdude

HTML

<select name="category">
    <option value="0">None</option>
    <option value="1" rel="accessories">Cellphones</option>
    <option value="2" rel="sports">Sports</option>
    <option value="3" rel="cars">Cars</option>
</select>
<select name="items" class="cascade">
    <option value="3" class="accessories">Smartphone</option>
    <option value="8" class="accessories">Charger</option>
    <option value="1" class="sports">Basketball</option>
    <option value="4" class="sports">Volleyball</option>
    <option value="6" class="cars">Corvette</option>
    <option value="2" class="cars">Monte Carloe</option>
</select>

CSS

.cascade {
    display: none;
}

JavaScript

$(document).ready(function(){
    var $cat = $('select[name=category]'),
        $items = $('select[name=items]');

    $cat.change(function(){
        var $this = $(this).find(':selected'),
            rel = $this.attr('rel'),
            $set = $items.find('option.' + rel);
        
        if ($set.size() < 0) {
            $items.hide();
            return;
        }
        
        $items.show().find('option').hide();
        
        $set.show().first().prop('selected', true);
    });
});