JSFiddle - React, Tailwind, and code Playground

HTML

<input type="file" name="this">

JavaScript

function handleFile(e) {
    var reader = new FileReader();
    reader.onload = function (event) {
    alert("reader.onload called"); //<-----
        var img = new Image();
        img.onload = function () {
            clickedImg.src = img.src;
        }
        img.src = event.target.result;
    }
    reader.readAsDataURL(e.target.files[0]);
}

$('input').on('change', function(e){
    handleFile(e);
});