JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/cupertino/jquery-ui.css">
<ul>
    <li class="move-img">
        <select style="width:150px;"id="modul1" onchange="$.modules.options(this,1);">
            <option value="0"></option>
            <option value="1">name</option>
            <option value="2">name2</option>
            <option value="3">name3</option>
        </select>
    </li>
    
    <li class="move-img">
        <select style="width:150px;"id="modul2" onchange="$.modules.options(this,2);">
            <option value="0"></option>
            <option value="1">name</option>
            <option value="2">name2</option>
            <option value="3">name3</option>
        </select>
    </li>
    
</ul>

JavaScript

$.modules = {

    /*  Get price for option-modules */
    options: function(module_id, show_divid) {

        var modul = $(module_id).val();

        if (modul != 0) {
            var selector = ".move-img option:selected[value=" + modul + "]";
            if ($(selector).length > 1) { // see if this value has been selected elsewhere
                alert('The value has been selected. Try again');
                $('option:eq(0)', module_id).attr('selected', 'selected');
            }
            /*
            //show price 
            $("#showprice" + show_divid).html('<div class="ajax_loader left"></div>').fadeTo(300, 0.25, function() {

                var $show_price = $(this); // div tag
                $.post('/ajax/modules/get_prices/', {
                    check_data: 'send_data',
                    get_module_prices_id: modul
                }, function(data) {
                    $show_price.fadeTo(200, 100, function() {

                        $show_price.html(data.module_price);
                    });
                }, 'json');
            });
            */
        }
    }
}