Urlencode deep in dart - list

Question

I've similar question like Urlencoding in Dart. I can encode Map, by HttpRequest.postFormData. But JQuery post method can encode Map<String, dynamic>. JQuery example:
$.post("controller",
{actualTime: 1357089552, events: [{priceInsert: 1.32128, priceExecution: 1.32128}]},
function(data) {/*handle*/});
Firebug HttpRequest post view:
actualTime 1357089552
events[0][priceExecution] 1.32128
events[0][priceInsert] 1.32128
Payload source is:
actualTime=1357089552&events%5B0%5D%5BpriceInsert%5D=1.32128&events%5B0%5D%5BpriceExecution%5D=1.32128
Dart can't do it easily. Someone has this problem solved?
PHP with nette requires to set some header:
X-Requested-With:XMLHttpRequest
Content-Type:application/x-www-form-urlencoded; charset=UTF-8

Answer 1

I've some dirty quick fix. Not complete, not tested, working for me:
Map<String, dynamic> data = {"actualTime": 1357089552, "events": [{"priceInsert": 1.32128, "priceExecution": 1.32128}]};
StringBuffer urlData = new StringBuffer("");
bool first = true;
void urlEncode(dynamic sub, String path){
if(sub is List){
for(int i = 0;i<sub.length;i++){
urlEncode(sub[i], "$path%5B$i%5D");
}
}else if(sub is Map){
sub.forEach((k,v){
if(path == ""){
urlEncode(v, "${Uri.encodeQueryComponent(k)}");
}else{
urlEncode(v, "$path%5B${Uri.encodeQueryComponent(k)}%5D");
}
});
}else{
if(!first){
urlData.write("&");
}
first = false;
urlData.write("$path=${Uri.encodeQueryComponent(sub.toString())}");
}
}
urlEncode(data, "");
HttpRequest xhr = new HttpRequest();
xhr
..open('POST', url)
..onLoadEnd.listen((ProgressEvent event){/*handle success*/}, onError: (){/*handle error*/})
..setRequestHeader("X-Requested-With", "XMLHttpRequest")
..setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8")
..send(urlData.toString());