JSFiddle - React, Tailwind, and code Playground

by synz izynz

HTML

<select name='test' class='myclass' id='myid' data-n="q34234">
    <option value="2" selected='selected'>2</option>
    <option value="9999">lain-lain</option>
</select>


<input class='myinp'>

JavaScript

$.fn.test = function(){
   
     var myval = $(this).val();
    
    if(myval==='9999')
        $('.myinp').show();
    else
         $('.myinp').hide();
};

$('#myid').on('change',function(){
    $(this).test();
});

$('#myid').test();