AJAX异步取缓存数据(先挖个坑，留着以后再用)
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javascript
///通过AJAX得到数据
function GetDataFromServer(pageIndex) { // by xu
var ItemCode = $("#txtItemCode").val();
var ItemDesc = $("#txtDesc").val();
var PageType = ""; //E,C
var ItemType = ""; //QO,PB......
var isStore = 1; //1?
if ($("#<%= rbRequestType.ClientID%>").find("input[CHECKED]").val() == "Opex") {
PageType = "E";
}
else {
PageType = "C";
}
if ($("#<%= rbFormType.ClientID%>").find("input[CHECKED]").val() == "Store") {
isStore = 1;
}
else {
isStore = 0;
}
if ($("#<%= rbPRStorePurpose.ClientID%>").find("input[CHECKED]").val() == "Daily") {
ItemType = "";
}
else if ($("#<%= rbPRStorePurpose.ClientID%>").find("input[CHECKED]").val() == "QuarterlyOrder") {
ItemType = "QO";
}
else if ($("#<%= rbPRStorePurpose.ClientID%>").find("input[CHECKED]").val() == "PaperBag") {
ItemType = "PB";
}
$.ajax({
type: "Get",
dataType: "json",
url: "GetItemCode.aspx",
data: { ItemCode: ItemCode, Desc: ItemDesc, ItemType: ItemType, sItemStart: PageType, pageIndex: pageIndex, isStore: isStore },
beforeSend: function () {
//清除老数据。
$("#loading").show();
},
success: function (jsonList) {
if (!jsonList) {
alert("There are no avaliable item data");
}
else {
ReadJSON(eval(jsonList));
}
},
error: function (message) {
alert("Loading item failed:" + message);
},
complete: function () {
$("#loading").hide();
$("#Currentpage").text(pageIndex);
}
});
}
//读取从服务器端返回的json并将数据拼成html格式。
function ReadJSON(jsonList) { // by xu
var ItemHTML = "";
for (var i in jsonList.ItemCode) {
var TRHTML = "
if (i % 2 == 0) {
TRHTML = "
}
else {
TRHTML = "
}
TRHTML += CreateTD("TDData", jsonList.ItemCode[i]["Title"]);
TRHTML += CreateTD("TDData", jsonList.ItemCode[i]["ItemType"]);
TRHTML += CreateTD("TDData", jsonList.ItemCode[i]["Description"]);
TRHTML += CreateTD("TDData", jsonList.ItemCode[i]["Unit"]);
TRHTML += CreateTD("TDData", jsonList.ItemCode[i]["AssetClass"]);
TRHTML += CreateTD("hidden", jsonList.ItemCode[i]["VendorID"]);
TRHTML += CreateTD("hidden", jsonList.ItemCode[i]["DeliveryPeriod"]);
TRHTML += CreateTD("hidden", jsonList.ItemCode[i]["UnitPrice"]);
TRHTML += CreateTD("hidden", jsonList.ItemCode[i]["TaxValue"]);
TRHTML += CreateTD("hidden", jsonList.ItemCode[i]["IsAccpetDecimal"]);
TRHTML += CreateTD("hidden", jsonList.ItemCode[i]["Currency"]);
TRHTML += CreateTD("hidden", jsonList.ItemCode[i]["ItemScope"]);
TRHTML += CreateTD("hidden", jsonList.ItemCode[i]["PackagedRegulation"]);
TRHTML += "
ItemHTML += TRHTML;
}
ClearItemData();
$(ItemHTML).insertAfter("#TRTitle");
SetPrveNextStatus(jsonList.TotalCount[0]["Count"]);
}
//设置下一页和上一页的显示状态
function SetPrveNextStatus(totalCount) {
if (CurrentPageIndex * PageSize < totalCount) {
$("#Next").show();
}
else {
$("#Next").hide();
}
if (CurrentPageIndex > 1) {
$("#Prev").show();
}
else {
$("#Prev").hide();
}
// alert("TotalCount:" + totalCount + "CurrentIndex:" + CurrentPageIndex);
}
C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Microsoft.SharePoint;
using System.Data;
using System.Text;
namespace CA.WorkFlow.UI.PurchaseRequest
{
public partial class GetItemCode : System.Web.UI.Page//CAWorkFlowPage//
{
///
/// Itemcode缓存的Key
///
internal string sItemCacheKey = "ItemCode";
internal TimeSpan tsCache = TimeSpan.FromMinutes(PurchaseRequestCommon.GetPRCacheMinutes());
int iPageSize = 10;
protected void Page_Load(object sender, EventArgs e)
{
try
{
string sItemCode = Context.Request.QueryString["ItemCode"].ToString();
string sDecription = Context.Request.QueryString["Desc"].ToString();
string sItemTyp = Context.Request.QueryString["ItemType"].ToString();// QO,PB......
string sItemStart = Context.Request.QueryString["sItemStart"].ToString();//E,X
string sIsStore = Context.Request.QueryString["isStore"].ToString();//
int iPageIndex = int.Parse(Context.Request.QueryString["pageIndex"].ToString());
string sJson = SearchItemCode(sItemCode, sDecription, sItemTyp, sItemStart, iPageIndex, sIsStore == "1" ? true : false);
Response.Clear();
Response.Write(sJson);
}
catch (Exception ex)
{
CommonUtil.logError("CA.WorkFlow.UI.PurchaseRequest.GetItemCode has an error:" + ex.ToString());
}
Response.End();
}
string SearchItemCode(string sItemCode, string sDecription, string sItemTyp, string sItemStart, int iPageIndex, bool isStore)
{
string sJson = string.Empty;
DataTable dtResult = new DataTable();
DataTable dt = new DataTable();
dt = PurchaseRequestCommon.GetActiveItemCode();/得到所有的可用的ItemCode数据
EnumerableRowCollection
where (string.IsNullOrEmpty(sItemCode) || AsString(dr["Title"]).StartsWith(sItemCode, StringComparison.CurrentCultureIgnoreCase))
&& (string.IsNullOrEmpty(sDecription) || AsString(dr["Description"]).Contains(sDecription))
&& (isStore ? AsString(dr["ItemScope"]).Trim().Equals(sItemTyp, StringComparison.CurrentCultureIgnoreCase) : true) //QO,PB......
&& (AsString(dr["Title"]).StartsWith(sItemStart, StringComparison.CurrentCultureIgnoreCase) || AsString(dr["Title"]).StartsWith("X", StringComparison.CurrentCultureIgnoreCase))//E,C
select dr;
DataTable dt10 = drColle.CopyToDataTable();
int iCount = dt10.Rows.Count;
if (iCount > 0)
{
int iCurrentRow = (iPageIndex - 1) * iPageSize;
List
int iMaxRowIndex = iCurrentRow + iPageSize;
if (iCount < iPageSize)///当结果行数少于每页显示的行数
{
iMaxRowIndex = iCount;
}
if (iMaxRowIndex > iCount)//请求的最后一页所要求的行数大于所在行数。
{
iMaxRowIndex = iCount;
}
for (int i = iCurrentRow; i < iMaxRowIndex; i++)
{
listDr.Add(dt10.Rows[i]);
}
dtResult = listDr.CopyToDataTable();
sJson = PurchaseRequestCommon.DataTableToJson("ItemCode", dtResult, iCount);
}
return sJson;
}
///
/// 得到可用的ItemCode的数据（从缓存中读取。）
///
///
public DataTable GetActiveItemCode()
{
DataTable dt = new DataTable();
dt = HttpContext.Current.Cache[sItemCacheKey] as DataTable;
if (dt == null)///缓存过期或缓存中没有
{
SPQuery query = new SPQuery();
query.Query = @"
///query.RowLimit = 10;
query.ViewFields = GetQueryFiled();
dt = SPContext.Current.Web.Lists["Item Codes"].GetItems(query).GetDataTable();
HttpContext.Current.Cache.Insert(sItemCacheKey, dt, null, System.Web.Caching.Cache.NoAbsoluteExpiration, tsCache);
}
return dt;
}
///
///
///
///
string GetQueryFiled()
{
StringBuilder sb = new StringBuilder();
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
sb.Append("
return sb.ToString();
}
string AsString(object o)
{
if (o == null)
{
return string.Empty;
}
else
{
return o.ToString();
}
}
}
}