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  • ajax 失焦点局部刷新 判断是否存在

    jsp代码

    <input type="text" name="productname" id="productname" value="" onblur="javascript:myCheck()"/>

    js 代码

    var xmlHttp = newXMLHttpRequest();    

    function newXMLHttpRequest() {     

              var xmlreq;    

              if (window.XMLHttpRequest) {     

                    xmlreq = new XMLHttpRequest();    

              } else if (window.ActiveXObject) {      

              try {      

                     xmlreq = new ActiveXObject("Msxml2.XMLHTTP");      

              } catch(e1) {      

              try {        

                   xmlreq = new ActiveXObject("Microsoft.XMLHTTP");       

              } catch(e2) {}      

          }    

    }    

     return xmlreq;   

    }

       //检查_入口    

    function myCheck(){     

            var name = $("#productname").val();    

            if(name == "" || name == null ){            

                alert("名不能为空");                      

                document.forms['giftdetailform'].productname.focus();           

           }else{       

                 var url='giftDetail.do?method=checkName&productname='+encodeURI(name);       

                 xmlHttp.open("GET", url);         

                 xmlHttp.onreadystatechange = checkName; //回调函数         

                 xmlHttp.send(null);      

            }    

    }    

    //检查_ajax方法    

    function checkName(){   

             if (xmlHttp.readyState == 4) {      

                  if (xmlHttp.status == 200) {       

                         var json = eval("(" + xmlHttp.responseText + ")");       

                          if(json.res == 1){       

                                   alert("名已经存在");       

                                   document.forms['giftdetailform'].productname.focus();          

                         }      

                  }    

           }    

    }

    Action 方法

    public ActionForward checkName(ActionMapping mapping, ActionForm form,
       HttpServletRequest request, HttpServletResponse response) throws Exception{
        response.setContentType("application/json");// 设置返回数据类型为xml格式
        response.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();
        StringBuffer buf = new StringBuffer();
        JSONObject jsonResult = new JSONObject();
        String name = request.getParameter("productname");
        List<GiftDetailForm> listgdf = giftDetailManager.findByName(name.trim());// 查询方法
        if (listgdf.isEmpty()) {
           buf.append(0);
        }else{
           buf.append(1);
        }
        jsonResult.put("res",buf.toString());
        out.print(jsonResult.toString());
        out.close();
        return null;
     }

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  • 原文地址:https://www.cnblogs.com/bailuobo/p/2573205.html
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