无法在IE9中提交表单

Question

I have the following code which is doing a javscript post using an XmlHttpRequest:

var request = new XMLHttpRequest();
var postedFile = document.getElementById("file").files[0];
var formElement = document.getElementById("formID");
var form = new FormData(formElement);

form.append('postedFile', postedFile);
request.open("POST", "/Admin/SaveQuestion/", true);
request.send(form);

This code is working in Chrome, Firefox, IE10, IE11 but I cannot seem to get it to work on IE9. Would this have something to do with the posted file or does my issue lie with the XmlHttpRequest?

Answer 1

FormData is not supported in IE9. https://developer.mozilla.org/en-US/docs/Web/API/FormData