Web jquery表格组件 JQGrid 的使用 - 7.查询数据、编辑数据、删除数据
系列索引
Web jquery表格组件 JQGrid 的使用 - 从入门到精通 开篇及索引
Web jquery表格组件 JQGrid 的使用 - 4.JQGrid参数、ColModel API、事件及方法
Web jquery表格组件 JQGrid 的使用 - 5.Pager翻页、搜索、格式化、自定义按钮
Web jquery表格组件 JQGrid 的使用 - 6.准备工作 & Hello JQGrid
Web jquery表格组件 JQGrid 的使用 - 7.查询数据、编辑数据、删除数据
Web jquery表格组件 JQGrid 的使用 - 8.Pager、新增数据、查询、刷新、查看数据
Web jquery表格组件 JQGrid 的使用 - 全部代码
Web jquery表格组件 JQGrid 的使用 - 11.问题研究
目录
查询数据
编辑数据
删除数据
7.查询数据、编辑数据、删除数据
在ProcessRequest 函数下修改:
public void ProcessRequest(HttpContext context)
{
//查找
if (context.Request.Params.Get("_search") == "true")
{
return;
}
NameValueCollection forms = context.Request.Form;
string strOperation = forms.Get("oper");
string strResponse = string.Empty;
if (strOperation == null)
{
//排序
if (context.Request.Params.Get("sidx") != null &&
!string.IsNullOrEmpty(context.Request.Params.Get("sidx").ToString()) &&
context.Request.Params.Get("sord") != null &&
!string.IsNullOrEmpty(context.Request.Params.Get("sord").ToString()))
{
return;
}
strResponse = GetJson(GetUserDT()); //load data
}
context.Response.Write(strResponse);
}
private DataTable GetUserDT()
{
string cmdText = "SELECT UserId, UserCode, Password FROM T_User";
SQLHelper sqlhelper = new SQLHelper();
DataTable dt = sqlhelper.Selectinfo(cmdText);
return dt;
}
private string GetJson(DataTable dt)
{
JavaScriptSerializer serializer = new JavaScriptSerializer();
List<Dictionary<string, object>> rows = new List<Dictionary<string,
object>>();
Dictionary<string, object> row = null;
foreach (DataRow dr in dt.Rows)
{
row = new Dictionary<string, object>();
foreach (DataColumn col in dt.Columns)
{
string s = dr[col].ToString(); //特殊情况
if (col.ColumnName == "IsAdmin")
{
s = s == "1" ? "是" : "否";
}
if (col.ColumnName == "HasWrite")
{
s = s == "1" ? "是" : "否";
}
row.Add(col.ColumnName.Trim(), s);
}
rows.Add(row);
}
return serializer.Serialize(rows);
}
稍加留意便可发现context.Request.Params里存有大量的参数，比如第一次加载时如下所示：
{_search=false&nd=1410940615486&rows=10&page=1&sidx=&sord=asc&CNZZDATA155540=cnzz_eid%2
53D900936271-1409219704-%2526ntime%253D1409219704&ALL_HTTP=HTTP_CONNECTION%3akeepalive%
0d%0aHTTP_ACCEPT%3aapplication%2fjson%2c+text%2fjavascript%2c+*%2f*%3b+q%3d0.01%0d%0aH
TTP_ACCEPT_ENCODING%3agzip%2cdeflate%2csdch%0d%0aHTTP_ACCEPT_LANGUAGE%3azh-
CN%2czh%3bq%3d0.8%2czh-
TW%3bq%3d0.6%0d%0aHTTP_COOKIE%3aCNZZDATA155540%3dcnzz_eid%253D900936271-1409219704-
%2526ntime%253D1409219704%0d%0aHTTP_HOST%3alocalhost%3a12590%0d%0aHTTP_REFERER%3ahttp%3a%2f%
2flocalhost%3a12590%2fJQGrid2.aspx%0d%0aHTTP_USER_AGENT%3aMozilla%2f5.0+(Windows+NT+6.1)+App
leWebKit%2f537.36+(KHTML%2c+like+Gecko)+Chrome%2f37.0.2062.120+Safari%2f537.36%0d%0aHTTP_X_R
EQUESTED_WITH%3aXMLHttpRequest%0d%0a&ALL_RAW=Connection%3a+keepalive%
0d%0aAccept%3a+application%2fjson%2c+text%2fjavascript%2c+*%2f*%3b+q%3d0.01%0d%0aAccep
t-Encoding%3a+gzip%2cdeflate%2csdch%0d%0aAccept-Language%3a+zh-CN%2czh%3bq%3d0.8%2czh-
TW%3bq%3d0.6%0d%0aCookie%3a+CNZZDATA155540%3dcnzz_eid%253D900936271-1409219704-
%2526ntime%253D1409219704%0d%0aHost%3a+localhost%3a12590%0d%0aReferer%3a+http%3a%2f%2flocalh
ost%3a12590%2fJQGrid2.aspx%0d%0aUser-
Agent%3a+Mozilla%2f5.0+(Windows+NT+6.1)+AppleWebKit%2f537.36+(KHTML%2c+like+Gecko)+Chrome%2f
37.0.2062.120+Safari%2f537.36%0d%0aX-Requested-
With%3a+XMLHttpRequest%0d%0a&APPL_MD_PATH=%2fLM%2fW3SVC%2f17%2fROOT&APPL_PHYSICAL_PATH=c%3a%
5cusers%5cjhl%5cdocuments%5cvisual+studio+2013%5cProjects%5cJqGrid%5cJqGrid%5c&AUTH_TYPE=&AU
TH_USER=&AUTH_PASSWORD=&LOGON_USER=&REMOTE_USER=&CERT_COOKIE=&CERT_FLAGS=&CERT_ISSUER=&CERT_
KEYSIZE=&CERT_SECRETKEYSIZE=&CERT_SERIALNUMBER=&CERT_SERVER_ISSUER=&CERT_SERVER_SUBJECT=&CER
T_SUBJECT=&CONTENT_LENGTH=0&CONTENT_TYPE=&GATEWAY_INTERFACE=CGI%2f1.1&HTTPS=off&HTTPS_KEYSIZE=&HTTPS_SECRETKEYSIZE=&HTTPS_SERVER_ISSUER=&HTTPS_SERVER_SUBJECT=&INSTANCE_ID=17&INSTANCE_M
ETA_PATH=%2fLM%2fW3SVC%2f17&LOCAL_ADDR=%3a%3a1&PATH_INFO=%2fWebService%2fUserHandler.ashx&PA
TH_TRANSLATED=c%3a%5cusers%5cjhl%5cdocuments%5cvisual+studio+2013%5cProjects%5cJqGrid%5cJqGr
id%5cWebService%5cUserHandler.ashx&QUERY_STRING=_search%3dfalse%26nd%3d1410940615486%26rows%
3d10%26page%3d1%26sidx%3d%26sord%3dasc&REMOTE_ADDR=%3a%3a1&REMOTE_HOST=%3a%3a1&REMOTE_PORT=1
1798&REQUEST_METHOD=GET&SCRIPT_NAME=%2fWebService%2fUserHandler.ashx&SERVER_NAME=localhost&S
ERVER_PORT=12590&SERVER_PORT_SECURE=0&SERVER_PROTOCOL=HTTP%2f1.1&SERVER_SOFTWARE=Microsoft-
IIS%2f8.0&URL=%2fWebService%2fUserHandler.ashx&HTTP_CONNECTION=keepalive&
HTTP_ACCEPT=application%2fjson%2c+text%2fjavascript%2c+*%2f*%3b+q%3d0.01&HTTP_ACCEPT_E
NCODING=gzip%2cdeflate%2csdch&HTTP_ACCEPT_LANGUAGE=zh-CN%2czh%3bq%3d0.8%2czh-
TW%3bq%3d0.6&HTTP_COOKIE=CNZZDATA155540%3dcnzz_eid%253D900936271-1409219704-
%2526ntime%253D1409219704&HTTP_HOST=localhost%3a12590&HTTP_REFERER=http%3a%2f%2flocalhost%3a
12590%2fJQGrid2.aspx&HTTP_USER_AGENT=Mozilla%2f5.0+(Windows+NT+6.1)+AppleWebKit%2f537.36+(KH
TML%2c+like+Gecko)+Chrome%2f37.0.2062.120+Safari%2f537.36&HTTP_X_REQUESTED_WITH=XMLHttpReque
st} System.Collections.Specialized.NameValueCollection {System.Web.HttpValueCollection}
搜索时_search=true
增删改时有参数oper。第一次加载时可以看出这个参数为null。此时就要加载数据了。查询出一个
datatable序列化后返回就好了，前端自会处理。
增加时oper=add
修改时oper=edit
删除时oper=del
数据加载完成后有个事件loadComplete，在这里可以进行一些操作比如遍历表格修改一些显示。
比如下面这个例子，遍历所有行，把每行的UserCode修改为行号：
loadComplete: function (xhr) {
var users = $(grid_selector).jqGrid('getDataIDs');
if (users) {
for (var i = 0, j = users.length; i < j; i++) {
ParkId = $(grid_selector).jqGrid('getCell', users[i],
'UserCode');
$(grid_selector).jqGrid('setRowData', users[i], {'UserCode':
i});
}
}
},
需要在colNames里新增一列为第一列，值自定义或为空即可，colNames: [' ', 'Id', '用户名',
'密码'],对应的，colModel里需要增加这些内容：
{
name: 'myac', index: '', width: 80, fixed: true, sortable:
false, resize: false,
formatter: 'actions',
formatoptions: {
keys: true,
//editbutton: true,
editformbutton: true,
// extraparam: { oper: 'edit' },
editOptions: { //编辑操作，这个很重要，实现编辑时传送参数
什么的。
reloadAfterSubmit: true,
//editData: {
// editkey: function () {
// var sel_id =
$(grid_selector).jqGrid('getGridParam', 'selrow');
// var value = $(grid_selector).jqGrid('getCell',
sel_id, 'UserId');
// return value;
// }
//},
closeAfterEdit: true,
afterSubmit: function (response, postdata) {
if (response.responseText != "") {
alert(response.responseText);
$(this).jqGrid('setGridParam', { datatype:
'json' }).trigger('reloadGrid');
return [true, response.responseText]
}
},
},
delOptions: { //删除操作，这个很重要，实现删除时传送参数什
么的。 这处网上没有例子的。
reloadAfterSubmit: true,
delData: {
delId: function () {
var sel_id =
$(grid_selector).jqGrid('getGridParam', 'selrow');
var value = $(grid_selector).jqGrid('getCell',
sel_id, 'UserId');
return value;
}
},
afterSubmit: function (response, postdata) {
if (response.responseText != "") {
alert(response.responseText);
$(this).jqGrid('setGridParam', { datatype:
'json' }).trigger('reloadGrid');
return [true, response.responseText]
}
}
},
}
},
Formatoptions下有delbutton和editbutton，可以设置为true或false。默认为true。一般不要管就
好了。
Width只能为数字不能为百分比，grid会根据全部列自己计算比例。
Fixed表示不会随下面的滚动轴一起滚动。
Sortable表示能否排序。
Editformbutton表示是在弹出窗口中编辑还是行编辑。
editOptions和delOptions为设置编辑或删除时的一些参数。reloadAfterSubmit为操作完成后是否
重新加载表格数据，一般数据变动后必须重新加载一次的：
$(this).jqGrid('setGridParam', { datatype: 'json' }).trigger('reloadGrid');
closeAfterEdit为弹出窗体编辑时，提交后是否关闭编辑框。
editData和delData很重要，这里可以向http handler传递一些参数，比如获取行id传给处理函数：
var sel_id = $(grid_selector).jqGrid('getGridParam', 'selrow');
var value = $(grid_selector).jqGrid('getCell', sel_id, 'UserId');
以上两行代码实现的是获取选择行的'UserId'。
多个选择需要遍历：
var sel_id = [];
sel_id = $(grid_selector).jqGrid('getGridParam',
'selarrrow');
var value = '';
for (var i = 0; i < sel_id.length; i++) {
value = value + ',' + $(grid_selector).jqGrid('getCell',
sel_id[i], 'ParkId');
}
if (value.charAt(0) == ',') {
value = value.substr(1);
}
http handler处理程序：
if (strOperation == "edit")
{
user.UserId = int.Parse(forms.Get("UserId").ToString());
if (CheckUserExist(user.UserCode, user.UserId.ToString()))
{
strResponse = "用户名重复，请确认！";
}
else
{
strResponse = UpdateUser(user) ? "用户更新成功！" : "用户更新失败，
请确认！";
}
context.Response.Write(strResponse);
}
/// <summary>
/// 更新用户信息
/// </summary>
/// <param name="objuser"></param>
/// <returns>更新成功与否</returns>
private bool UpdateUser(User objuser)
{
string sql = "UPDATE T_User SET UserCode = '" + objuser.UserCode +
"',Password = '" + objuser.Password + "' WHERE UserId=" + objuser.UserId;
SQLHelper sqlhelper = new SQLHelper();
return sqlhelper.AddDelUpdate(sql) > 0;
}
private bool CheckUserExist(string UserCode, string UserId)
{
string sql = "select * from T_User where UserCode = '" + UserCode + "' and
UserId <> " + UserId;
SQLHelper sqlhelper = new SQLHelper();
DataTable dt = sqlhelper.Selectinfo(sql);
return dt == null || (dt != null && dt.Rows.Count == 1);
}
代码参考编辑数据即可。
http handler处理程序：
if (strOperation == "del")
{
strResponse = DeleteUser(forms.Get("delId").ToString()) ? "删除成功！" :
"删除失败，请确认！";
}
context.Response.Write(strResponse);
private bool DeleteUser(string userId)
{
bool flag = true;
string[] idlist = userId.Split(',');
foreach (var sid in idlist)
{
string sql = "DELETE FROM T_User WHERE UserId=" + userId;
SQLHelper sqlhelper = new SQLHelper();
flag = sqlhelper.AddDelUpdate(sql) > 0;
}
return flag;
}
