function createSelectMenu(){
    var dropDown=document.createElement("SELECT");
    var form=1;
    var myIndex="";
    var id="";
    var xhr=new XMLHttpRequest();
    xhr.open("GET","data/crud.php",true);
    xhr.onreadystatechange=function(){
        if(xhr.readyState==4 && xhr.status==200){
            console.log(xhr.responseText)//the console logs what i expect!!!
            var selectMenu=JSON.parse(xhr.responseText);
            console.log(selectMenu);
            if(selectMenu.success===true){
                var i = 0;
                var text = "";
                do{
                    var optionSelectMenu=document.createElement("OPTION");
                    optionSelectMenu.text+=ArrayScegliCausali[i].description;
                    optionSelectMenu.value=ArrayScegliCausali[i].code;
                    if(form===1){
                        id=selectMenu[i].id;
                        if(myArr[myArray.value].id===Number(id)){
                            myIndex=i;
                        }
                    }else{
                        id=1;
                        myIndex=0;
                    }
                    dropDown.add(optionSelectMenu);
                    i++;
                }
                while(i<selectMenu.length);
                dropDown.selectedIndex=myIndex;
                console.log(selectMenu.length)
                $(dropDown).selectmenu('refresh', true);
            }else{
                var error = document.createElement("DIV");
                error.id="input_error";
                error.className="custom_error_msg";
                var error_msg = document.createTextNode(selectMenu.error_msg);
                error.appendChild(error_msg);
                document.getElementById("formOperatori").appendChild(error);
                return false;
            }
        } else {
            console.log("error" + xhr.status + "occured in the ajax request.<br\/>");
        }
    };
    xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    xhr.send();
}