JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text">
<input id="btn-search" type="button" value="Button">
<select>
    <option value="20">20</option>
    <option value="21,30">21</option>
    <option value="22">22</option>
    <option value="23">23</option>
</select>

JavaScript

$('input[type="button"]').on('mousedown', function() {

    var search_str = $('input[type="text"]').val()
    
    var selector = document.getElementById('btn-search');
    var values = selector[selector.selectedIndex].value;

    $('option').each(function() {
        if(values == search_str)
        {
            alert ("true");
        }else if(values != search_str){
        		alert ("false");
        }
    });
});