<form method="post" action="registration.php">

<input name="username" type="text" placeholder="Username" id="name" />
<input name="password" type="password" placeholder="Password" id="password" />
<input name="confirmpassword" type="password" placeholder="Confirm Password" id="confirmpassword" />
<input name="email" type="text" placeholder="Email" id="email" />
<input name="phonenumber" type="text" placeholder="Phone number" id="phonenumber" />
<input name="submit" type="submit" value="Register"/>

</form>

function signUp(){
    var credsArr = {};
    credsArr["username"] = document.myform.username.value;
    credsArr["password"] = document.myform.password.value;
    credsArr["email"] = document.myform.password.value;
    credsArr["phonenumber"] = document.myform.password.value;
    var xmlhttp = new XMLHttpRequest();
    var url = "http://127.0.0.1:58889/phonegap/registration.php?username=" + credsArr["username"] + "&password=" + credsArr["password"] + "&email="+credsArr["email"] + "&phonenumber="+ credsArr["phonenumber"];
    xmlhttp.onreadystatechange=function() {
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
            myFunction(xmlhttp.responseText);
        }  else if (xmlhttp.status == 404) {
            intel.xdk.notification.alert("Web Service Doesn't Exist!", "Error");
        }
    };
    xmlhttp.open("POST", "http://127.0.0.1:58889/phonegap/registration.php", false);
    xmlhttp.send();
    function myFunction(response) {
        var arr = JSON.parse(response);
        if (arr.success == 1) {
            intel.xdk.notification.alert("Registered successful!");
        } else {
            intel.xdk.notification.alert(arr.success + " " + arr.message);
        }
    }
    return(true);

}

var url = "http://127.0.0.1:58889/phonegap/registration.php";

    var JSONObject= {
         "username":credsArr["username"],
         "password":credsArr["password"],
         "email:":credsArr["email"],
         "phonenumber:":credsArr["phonenumber"],
    };

    $.ajax({
        url: url,
        type: 'GET',
        data: JSONObject,
        dataType: 'json',
        contentType: "application/json; charset=utf-8",
        success: function (arr) {
           //do something
        },
        error: function () {
          //do something
        }
    });

/* button  #botRunAjax */
 $(document).on("click", "#botRunAjax", function (evt) {
     console.log("function started");
     var wpost = "e=132&c=abcdef&s=demoBASICA";
     $.ajax({
         type: "POST",
         crossDomain: true, //;paf; see http://stackoverflow.com/a/25109061/2914328
         url: "http://your.server.url/address",
         data: wpost,
         dataType: 'json',
         timeout: 10000
     })
     .always(function (retorno, textStatus, jqXHR) { //;paf; see http://stackoverflow.com/a/19498463/2914328
         console.log("jQuery version: " + $.fn.jquery) ;
         console.log("arg1:", retorno) ;
         console.log("arg2:", textStatus) ;
         console.log("arg3:", jqXHR) ;
         if( parseInt($.fn.jquery) === 1 ) {
             switch (retorno.status) {
                case 0:
                case 200:
                    console.log("exit OK");
                    console.log(JSON.stringify(retorno.responseJSON));
                    break;
                case 404:
                    console.log("exit by FAIL");
                    console.log(JSON.stringify(retorno.responseJSON));
                    break;
                default:
                    console.log("default switch happened") ;
                    console.log(JSON.stringify(retorno.responseJSON));
                    break ;
             }
         }
         if( (parseInt($.fn.jquery) === 2) && (textStatus === "success") ) {
             switch (jqXHR.status) {
                case 0:
                case 200:
                    console.log("exit OK");
                    console.log(JSON.stringify(jqXHR.responseJSON));
                    break;
                case 404:
                    console.log("exit by FAIL");
                    console.log(JSON.stringify(jqXHR.responseJSON));
                    break;
                default:
                    console.log("default switch happened") ;
                    console.log(JSON.stringify(jqXHR.responseJSON));
                    break ;
             }
         }
         else {
            console.log("unknown") ;
         }
     });
 });