convert pdf to base64 javascript

1// Check for the File API support.
2if (window.File && window.FileReader && window.FileList && window.Blob) {
3  document.getElementById('files').addEventListener('change', handleFileSelect, false);
4} else {
5  alert('The File APIs are not fully supported in this browser.');
6}
7
8function handleFileSelect(evt) {
9  var f = evt.target.files[0]; // FileList object
10  var reader = new FileReader();
11  // Closure to capture the file information.
12  reader.onload = (function(theFile) {
13    return function(e) {
14      var binaryData = e.target.result;
15      //Converting Binary Data to base 64
16      var base64String = window.btoa(binaryData);
17      //showing file converted to base64
18      document.getElementById('base64').value = base64String;
19      alert('File converted to base64 successfuly!\nCheck in Textarea');
20    };
21  })(f);
22  // Read in the image file as a data URL.
23  reader.readAsBinaryString(f);
24}