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');
                }
            });