JSFiddle - React, Tailwind, and code Playground

by Yuriy Petrichenko

HTML

<input type="file" onchange="previewFile()">
<img src="" height="200" alt="Image preview...">

CSS

img{
  width:100px;
  height:100px;
  border-radius:50%;
}

JavaScript

function previewFile() {
  var preview = document.querySelector('img');
  var file    = document.querySelector('input[type=file]').files[0];
  var reader  = new FileReader();

  reader.onloadend = function () {
    preview.src = reader.result;
  }

  if (file) {
    reader.readAsDataURL(file);
  } else {
    preview.src = "";
  }
}