尝试通过ajax的xmlhttprequest向控制器发布多个变量

Question

In my java application. I am trying to post more two javascript variable to via a xmlhttp post request of ajax but it is returning error 400. Ordinarily, if I comment out one of the post variables, then it posts successfully but on adding it, throws error. This is my attempt:

function sendChat() {
        var message = document.getElementById('new-input').value.trim();
        var noteVal = "mp3",
                xhr = new XMLHttpRequest();

        ....

        alert(noteVal);
        xhr.send(encodeURI('message=' + message));
        xhr.send(encodeURI('noteVal=' + noteVal)); //if I comment this out then everything is fine
    }

this is the spring controller to receive the post arguments

@ResponseBody
    @RequestMapping(value = "/post-data", method = RequestMethod.POST)
    public ModelAndView postData(HttpServletRequest request,
                           HttpServletResponse response,
                           @RequestParam String message,
                           @RequestParam String noteVal,

Please how can I post more than one variables to the controller method via XMLHttpRequest

Answer 1

You can only send once, so you send both values

xhr.send('message=' + encodeURI(message) + '&noteVal=' + encodeURI(noteVal));

or sending formData

var data = new FormData();
data.append('message', message);
data.append('noteVal', noteVal);

xhr.send(data);