JSFiddle - React, Tailwind, and code Playground

HTML

<input type="file" name="file" id="confirm" onchange="checkFile()">
  <input type="file" name="file" id="approveletter" onchange="checkFile()">
      <script>
              function checkFile()
    {   
    var node_list = document.getElementsByTagName('input');
    for (var i = 0; i < node_list.length; i++) 
    {
        var node = node_list[i];
        if (node.getAttribute('type') == 'file' && node.files.length>0) 
        {
          console.log(node.files[0]);
            var sFileName = node.value;
            var sFileExtension = sFileName.split('.')[sFileName.split('.').length - 1];
            var iFileSize = node.files[0].size;
            var iConvert=(node.files[0].size/10485760).toFixed(2);
        }

        if ((sFileExtension != "pdf" && sFileExtension != "doc" && sFileExtension != "docx") || iFileSize>10485760)
        {   
            txt="File type : "+ sFileExtension+"\n\n";
            txt+="Size: " + iConvert + " MB \n\n";
            txt+="Please make sure your file is in pdf or doc format and less than 10 MB.\n\n";
            alert(txt);
        }
    }
}
      </script>