JSFiddle - React, Tailwind, and code Playground

HTML

<select id="combo" name="comboname">
    <option value="_"></option>
    <option value="somevalue">somename</option>
    <option value="somevalue1">somename1</option>
</select>
<div id="textbox">
</div>

JavaScript

$("#combo").change(function () { 
        if (this.value != '_') {  
            $("#textbox").empty().append("<input type='text' id='text1'/>");
        } 
        else { 
            $("#textbox").hide(); 
        } 
    });