Post formdata via XMLHttpRequest object in JS ? ( cross browser)

Im trying to post a form data in js :

I have this code :

var formData = new FormData();
  formData.append("username", "Groucho");
  formData.append("accountnum", 123456);
  formData.append("afile", "2");

var xhr = new XMLHttpRequest();"POST", "http://xxxxx/xx.ashx",true);

Formdata according MDN is not available in IE ( or unknown).

When I try this in FF :

enter image description here ( i think its fine...).

when I try in IE :

enter image description here

What is the solution to post form data ( or my data but in objective way) CROSSBROWSER ?



You didn't say which version of IE you're using. The formData object is not supported in IE9 or lower. XMLHTTPRequest2 (which contains the formData object) should be supported in IE10 (

Cross-browser AJAX file upload is very hard to do right now. You could try building your own form header/boundaries in Javascript (see answer here: XMLHttpRequest POST multipart/form-data) but, personally, I don't believe it is worth the effort.


I wrote a simple wrapper that you can use to send FormData in IE (and it won't mess up anything in webkit/gecko either). Simply include the following js before you try to use FormData:

var ieFormData = function ieFormData(){
if(window.FormData == undefined)
    this.processData = true;
    this.contentType = 'application/x-www-form-urlencoded';
    this.append = function(name, value) {
        this[name] = value == undefined ? "" : value;
        return true;
    var formdata = new FormData();
    formdata.processData = false;
    formdata.contentType = false;
    return formdata;


Now simply switch all new FormData() calls to new ieFormData(), and switch

processData: false, 
contentType: false,


processData: formdata.processData,
contentType: formdata.contentType,
cache: false,

and you're all set. Of course, this won't allow you to include files (you still need the iframe hack), but it will allow you to mimic FormData in IE.


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