struts与jQuery的完美整合方式之二

 

public ActionForward test(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
	throws Exception {
		  PrintWriter out = response.getWriter();

		  String username = request.getParameter("username").trim();
		 
		  if(username!=null && isSave(username) ){//可以保存
			  out.print("{\"result\":\"success\"}");
		   }else{
		      out.print("{\"result\":\"failure\"}");
		   }
		   return null;
	}

 

 

<input type="button" name="checku" value="检查用户名是否重复" onclick="MYchecku()"/>
   <script language="javascript">
   function MYchecku(){
    alert($("#mail").val());
    if($("#mail").val()==""){
     $("#name_msg").text("请您输入用户名!"); 
    }else{
      var url="regist.do?method=test";
    
      $.ajaxSetup({cache:false});
     // alert(document.getElementById("username_error").innerHTML);
      // alert(document.getElementById("username_error").innerHTML);
     //开始调用这个方法
        $.getJSON(url,{"username":$("#mail").val()},function(json){
         if(json.result=='success'){
        $("#name_msg").text("用户名可用");
         }
         else if(json.result=='failure'){
        $("#name_msg").text("用户名已被占用");
         }
      });
    } 
   }
    
   </script>