Inspecting Browser-Supplied MIME-Types

index.html

<form method="post" enctype="multipart/form-data" id="form" onSubmit="return runIt();">
  <label for="fileInput">Select a File</label>
  <input multiple="true" type="file" id="fileInput" name="fileInput" />
  <input type="submit" name="submit" value="Check!" />
</form>

inspecting-browser-supplied-mime-types.markdown

Inspecting Browser-Supplied MIME-Types

A Pen by Michael D Stemle Jr on CodePen.

License.

script.js

function runIt() {
  console.log("HERE")
  try {
    alert("MIME-type: " + document.getElementById('fileInput').files[0].type);
  } catch (err) {
    console.error(err);
  }
  return false;
}