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Read Text File In Javascript Using Filereader






Text File




Picture showing the sample text file



Read Text File




  1. Add a file upload control.
  2. Add a reference to jQuery.
  3. Add file upload change event.
  4. Use FileReader object to read text file.


<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
    <script>
         $(document).ready(function () {
             $("#upload").change(function (evt) {
                 for (var i = 0, f; f = evt.target.files[i]; i++) {
                     var reader = new FileReader();
                     reader.onload = function (evt) {
                         alert(evt.target.result);
                     };
                     reader.readAsText(f);
                 }
             });
         });
    </script>
</head>
<body>
    <form>
        <input type="file" id="upload" />
    </form>
</body>
</html>



Output




Picture showing the output of reading the text file in JavaScript using FileReader



Posted By  -  Karan Gupta
 
Posted On  -  Sunday, February 5, 2017

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