send POST request in javascript.

You can send POST request using XMLHttpRequest.

 var http = new XMLHttpRequest();
    var url = '/yoururl';
    var params = 'name=xyz';
    http.open('POST', url, true);
    http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
    http.onreadystatechange = function () {
      if (http.readyState == 4 && http.status == 200) {
       // Success
      }else{
     // Error      
     }
    }
    http.send(params);