jQuery AJAX导航为POST

I want a web page, which when a button is pressed, the browser navigates to a URL with method POST, and some xml data as the request content. The response will also be xml. My question is similar to JQuery AJAX Post - pass variable and navigate URL , but the answers to that question do an ajax POST, followed by navigation to a GET of the URL, whereas I want a direct navigation via POST.

What I have tried so far?

<html>
  <head>
    <title>Entry page</title>
    <script src="js/lib/jquery/jquery-3.1.0.min.js"></script>
<script>
function LogIn() {
  $.ajax({
    url: "http://localhost:8080/Login/" + $( "#User" ).val(),
    data: '<m:password xmlns:m="http://acme.com">' + $( "#Password" ).val()  + "</m:password>",
    method: 'POST',
    type: "POST",
    contentType: "application/xml",
    dataType: "xml",
    success :function()
      {
        alert('Ok');
        window.location="http://localhost:8080/Login/" + $( "#User" ).val();
      },
      error : function (xhr, ajaxOptions, thrownError){
       console.log(xhr.status);
       console.log(thrownError);
} });
}
</script>
  </head>
 <body>
<form>
  <label>User<input id="User" type="text" value="Sean" name="User"/></label>
  <label>Password<input id="Password" type="password" name="Password"/></label>
</form>

<button onclick="LogIn()">Try it</button>

</body>
</html>

Cross Domain

I realise that this is cross domain. The server has been configured to allow this, and the cross-domain bit works perfectly well.

What is the issue?

The $.ajax() call simply invokes the POST, it doesn't navigate to it. Setting the window.location doesn't help, because this is a content-less GET, not a data-loaded POST.

Please advise.

The post request is posting the data to:

http://localhost:8080/Login/" + $( "#User" ).val()

This is on you local host so you should have a server side route on you application to catch this ajax post request and send a success/message back back. Try passing in a "data" parameter into your success function and see what it logs.

Solved thanks to https://formkeep.com/guides/submit-form-with-ajax

<html>
<head>
  <title>Entry page</title>
  <script src="js/lib/jquery/jquery-3.1.0.min.js"></script>

  <script>
// Thanks to https://formkeep.com/guides/submit-form-with-ajax
$(function() {
  $('#form3').submit(function(event) {
    var formEl = $(this);
    var submitButton = $('input[type=submit]', formEl);
    var url = "http://localhost:8080/Login/" + $( "#User" ).val();
    var datum = '<m:password xmlns:m="http://acme.com">' + $( "#Password" ).val()  + "</m:password>";

    $('#x').val(datum);
    $("#form3").attr("action", url);

    $.ajax({
      type: 'POST',
      url: url,
      data: datum,
      dataType: "xml",
      contentType: "application/xml",
      beforeSend: function() {
        submitButton.prop('disabled', 'disabled');
      },
      error   :function (xhr, ajaxOptions, thrownError)
        {
        console.log(xhr.status);
        console.log(thrownError);
        },
      done: function() {
        submitButton.prop('disabled', false);
      }
      });
  });
});
  </script>
</head>



<body>

<form id="form3" action="set-dynamically" method="POST">
  <label>User<input id="User" type="text" value="Sean" name="User"/></label>
  <label>Password<input id="Password" type="password" name="Password"/></label>
  <textarea style="display:none" name="x" id="x">
    <m:password xmlns:m="http://acme.com">Password</m:password>
  </textarea>
  <input value="Submit" type="submit">
</form>


</body>
</html>