JSFiddle - React, Tailwind, and code Playground

HTML

<select name="webmenu" id="webmenu">
<option value="UK" id="UK_button" title="assets/images/uk_flag.png">eqwe&nbsp;</option>
<option value="US" id="US_button" title="assets/images/us_flag.png" >wqeqwe&nbsp;</option>
<option value="EU" id="EU_button" title="assets/images/euro_flag.png" >3211231&nbsp;</option>
</select>

JavaScript

$('#webmenu').change(function(){
    
var temp=$(this).children(":selected").val();
    switch(temp)
    {
        case 'UK':
            alert('Hello UK');
            break;
        case "EU":
            alert("HEllo EU");
            break;
    }

});