Reading text files with FileReader

<script>function readfile(f) { var reader = new FileReader(); reader.readAsText(f); reader.onload = function() { var text = reader.result; var out = document.getElementById(output); out.innerHTML = ''; out.appendChild(document.createTextNode(text)); } reader.onerror = function(e) { console.log(Error, e); };}</script>Select the file to display:<input type=file onchange=readfile(this.files[0])></input><pre id=output></pre>