JQuery asynchronously verifies that the sample code exists for the username

One requirement now is to asynchronously verify that the username exists. The techniques used are jQuery asynchronous validation and struts2 (the same goes for springMVC, which is just a controller).

Form:

 
<input class="width150" maxlength="32" type="text" id="dept_name" name="dept.dept_name" 
value="${dept.dept_name}" onchange="tocheckname()"/> 

Js code:

 
function tocheckname() 
{ 
var deptName= $("#dept_name").val(); 
$.ajax({ 
type:"POST", 
cache:false, 
url : "${rootPath}/dept/checkdeptname.htm", 
dataType : "text", 
data:{"dept.id":"${dept.id}","dept.dept_name":deptName}, 
async:false, 
success : function(data){ 
if(0<parseInt(data)){ 
alert(" This section already exists "); 
$("#dept_name").attr("value",""); 
$("#dept_name").focus(); 
} 
} 
}); 
} 

Background code:

 
 
public String checkdeptname() throws Exception { 
if (UtilAPI.isNull(dept)) { 
dept = new Dept(); 
} 
int count = this.deptService.checkdeptname(dept.getId(), dept.getDept_name()); //If there is a return 1, there is no return 0
try { 
response.getOutputStream().print(count); 
} 
catch (IOException e) { 
e.printStackTrace(); 
} 
return Action.NONE; 
}