Ajax的简单请求案例

         $.ajax({
                 url : rootPath +'/jasframework/choosepilecontrol/querySubsytem.do',
                 type : "POST",
                 dataType : "json",
                 success:function(data){
                     if(data.subsystem!=null){
                         var length = data.subsystem.length;
                         var option = new Option('-----请选择-----','');
                         subsystemSelectObj.add(option);
                         if(length>0){
                             for(var i=0;i<data.subsystem.length;i++){//循环数组,添加子节点
                                 var eventid = data.subsystem[i].EVENTID;
                                 var name = data.subsystem[i].SUBSYSTEMNAME;
                                 var option = new Option(name,eventid);
                                 subsystemSelectObj.add(option);
                             }
                             subsystemSelectObj.options[0].selected=true;
                             if(callback){
                                 callback();//调用页面传递进来的回调函数，主要用于修改页面设置分区值
                             }
                         }
                     }
                 }
             });

3.在请求前进行操作

     $.ajax({
             type: "put",
             url: szURL,
             async: false,
             timeout: 15000,
             processData: false,
             data: xmlDoc,
             beforeSend: function(xhr) {
                 xhr.setRequestHeader("If-Modified-Since", "0");
                 xhr.setRequestHeader("Authorization", "Basic " + g_oCommon.m_szUserPwdValue);
             },
             error:function(xhr, textStatus, errorThrown) {
                 that.setState(xhr);
             }
         });

当含有请求失败时候的案例

         $("#btnendsave").click(function(){
             $.ajax({
                 url : rootPath +'/jasframework/choosepilecontrol/queryMarkerById.do?MarkerId='+$('#endMarkerId1').val(),
                 type : 'POST',
                 success : function(data) {
                     var objJson = JSON.parse(data);
                     if($('#endMarkerPostion1').val()!=''){
                         $('#'+endMarkerTextId).val(objJson[0].markername+"+"+$('#endMarkerPostion1').val()+"m");
                     }else{
                         $('#'+endMarkerTextId).val(objJson[0].markername);
                     }

                 },
                 error : function(data) {
                     top.showAlert('错误', '查询出错', 'error');
                 }
             });