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<!DOCTYPE html>
<html>
<body>
​
<form action="https://www.w3schools.com/action_page.php">
  Select a file: <input type="file" id="myFile" name="usr_file" required>
  <input type="submit">
</form>
​
<p>Click the "Try it" button to find out if a file in the file upload field must be selected before submitting the form.</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myFile").required;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_fileupload_required by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:46:59 GMT -->
</html>
​
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