Web/API/FileReader/onload

The FileReader.onload property contains an event handler executed when the load event is fired, when content read with readAsArrayBuffer, readAsBinaryString, readAsDataURL or readAsText is available.

Example

// Callback from a <input type="file" onchange="onChange(event)">
function onChange(event) {
  var file = event.target.files[0];
  var reader = new FileReader();
  reader.onload = function(e) {
    // The file's text will be printed here
    console.log(e.target.result)
  };

  reader.readAsText(file);
}

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
onload	Chrome Full support 7	Edge Full support 12	Firefox Full support 3.6	IE Full support 10	Opera Full support 11	Safari Full support 6	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 32	Opera Android Full support 11	Safari iOS Full support 6.1	Samsung Internet Android Full support 1.0

Legend

Full support  

Full support

FileReader.onload by Mozilla Contributors is licensed under CC-BY-SA 2.5.