JSFiddle - React, Tailwind, and code Playground

HTML

<input type="file" id="fl" name="fl" onchange="preview()" />

JavaScript

function preview()
{
    //var dc = document.getElementById("fl").files;
    document.getElementById("fl").on('change', function () {
        fileElement = $(this);
        alert(fileElement[0].files.lenght);
       if(fileElement.length == 0)
       {
          alert("no file selected");
              //Get count of selected files
              var countFiles = fileElement[0].files.length;
       }
     });
}