I have a Telerik RadGrid. The initial DataSource that is bound to the grid has 145 records. I have filering turned on in the grid as well as paging and my pagesize is 20. When I filter down to 75 records, the MasterTableView.Items collection of the grid shows 20 records. This matches what's in the grid being displayed. However, I need to perform a Mass Change on the data and need the 75 filtered records. Is there somewhere in the Grid that has the 75 filtered records? I want to avoid having to get all 145 records again and then manually filtering.
Telerik doesn't provide a server side API to access filtered data in the grid, but there are a working around provided on their forum.
The solution is to save filtered rows primary key while grid loading and then use IDs later to get your data.
bool flag = false;
protected void RadGrid1_ItemCommand(object sender, GridCommandEventArgs e)
{
if (e.CommandName == RadGrid.FilterCommandName)
{
flag = true;
}
}
protected void RadGrid1_PreRender(object sender, EventArgs e)
{
if (flag)
{
foreach (GridDataItem grdItem in RadGrid1.Items)
{
int iID = Convert.ToInt32(grdItem.GetDataKeyValue("ID").ToString());
. . . .
}
flag = false;
}
}
for more information check the following link on telerik site:
http://www.telerik.com/community/forums/aspnet/grid/how-to-get-filter-data.aspx
Related
I have an Infragistics UltraGrid and I need to know when the user adds/removes a column grouping. I see there are events for when a row is collapsed/expanded and an event for when the grid's filter changes, but I don't see any events that would fire when a column grouping is added/removed. Does anyone know of an UltraGrid event that would fire at that point? If not, are there any workarounds I might be able to use to achieve this?
I've already tried using AfterBandHiddenChanged and AfterGroupPosChanged. Neither of those seem to do what I need.
I'm using Infragistics 11.2 CLR2.0 (I know it's quite out-of-date, but it's not my call to update it)
After some digging and experimenting, I found a workaround. It's not the prettiest, but it gets the job done. If anyone has any better suggestions, I'm all ears. But here's what I came up with in case someone else is interested.
I utilize the grid's BeforeSortChanged and AfterSortChanged events. The "Before" event sets a flag to indicate whether the groupings have changed. The "After" event is where I perform the operation I need to perform if the flag was set to indicate that the groupings changed.
Here's the "Before" event:
private void Grid_BeforeSortChange(object sender, Infragistics.Win.UltraWinGrid.BeforeSortChangeEventArgs e) {
int preSort = 0;
int postSort = 0;
// This set of sorted columns are the columns that were already sorted
// before the sort change.
foreach (var col in e.Band.SortedColumns) {
if (col.IsGroupByColumn) {
preSort++;
}
}
// This set of sorted columns are the columns that will be
// sorted after the sort change is applied
foreach (var col in e.SortedColumns) {
if (col.IsGroupByColumn) {
postSort++;
}
}
// Compare the number of grouped columns before the
// sort to the number after the sort
_groupingsChangedFlag = preSort != postSort
}
And here's the "After" event:
private void Grid_AfterSortChange(object sender, Infragistics.Win.UltraWinGrid.BandEventArgs e) {
if (!_groupingsChangedFlag) {
return;
}
// Groupings changed, so do some action
}
I have a telerik radgrid where columns and detail tables are declared like:
<telerik:RadGrid>
<Columns>
<telerik:GridBoundColumn/>
<telerik:GridBoundColumn/>
</Columns>
<DetailTables>
<telerik:GridTableView
<Columns>
<telerik:GridBoundColumn/>
<telerik:GridBoundColumn/>
</Columns>
</telerik:GridTableView
</DetailTables>
</telerik:RadGrid>
Which gives a nested grid like this:
Now, what I want is to be able to specify a detail table (those sub tables) per row, programmatically.
(I cannot be sure that the columns for the nested table that comes up when I expand the line fgvbvb will be the same as the columns when expanding the line xcxcv).
I have tried, without luck in the OnDataBound handler of the radgrid (in which I omitted <DetailTables>) to access the data structure for nested tables like this:
protected void OnRadGridDataBound(object sender, EventArgs e)
{
foreach (GridDataItem item in grdActivitiesToCopy.MasterTableView.Items)
{
var dg = item.ChildItem.NestedTableViews[0];
}
}
This will overindex the array NestedTableViews because it is empty. Also, item.ChildItem.NestedTableViews has no setter.
How do I populate each row with a detail table one by one manually?
According to Telerik:
RadGrid does not support mixing declarative grid columns with grid
columns added dynamically at runtime. You should either create all the
columns in the grid programmatically, or else define them all in the
ASPX file. When creating Detail tables, it should be created in the
PageInit event.
Creating a Hierarchical Grid Programmatically:
You should follow these basic steps in order to create hierarchical
RadGrid programmatically in the code-behind (having a data source
control for data content generation):
Create the grid dynamically in the Page_Init handler of the page by
calling its constructor.
Specify the preferred settings for your grid instance through its
properties.
Create columns for the grid dynamically. Keep in mind that you have to
first set their properties and then add them to the
MasterTableView/GridTableView collection (discussed in the first
paragraph of this same topic). Thus, their ViewState will be properly
persisted (as LoadViewState is raised after the Init event of the
page).
Set the proper ParentTableRelations for the GridTableViews (along with
their MasterKeyField and DetailKeyField attributes) and DataKeyNames
for the MasterTableView/GridTableViews in the code-behind of the page.
Assign data sources (through the DataSourceID attribute) for each
table in the grid hierarchy.If you do not want to use declarative
relations, generate the data in the NeedDataSource/DetailTableDataBind
handlers of the grid. On DetailTableDataBind you can determine which
data source should be related to the currently bound GridTableView by
checking its Name/DataSourceID property. Here, the Name property must
have a unique value for each detail table (this value has to be
defined previously by the developer) and the DataSourceID is the ID of
the DataSource control responsible for the corresponding detail table
content generation.
Code Sample:
RadGrid RadGrid1 = new RadGrid();
RadGrid1.DataSourceID = "SqlDataSource1";
RadGrid1.MasterTableView.DataKeyNames = new string[] { "CustomerID" };
RadGrid1.Skin = "Default";
RadGrid1.Width = Unit.Percentage(100);
RadGrid1.PageSize = 15;
RadGrid1.AllowPaging = true;
RadGrid1.AutoGenerateColumns = false;
//Add columns
GridBoundColumn boundColumn;
boundColumn = new GridBoundColumn();
boundColumn.DataField = "CustomerID";
boundColumn.HeaderText = "CustomerID";
RadGrid1.MasterTableView.Columns.Add(boundColumn);
boundColumn = new GridBoundColumn();
boundColumn.DataField = "ContactName";
boundColumn.HeaderText = "Contact Name";
RadGrid1.MasterTableView.Columns.Add(boundColumn);
//Detail table - Orders (II in hierarchy level)
GridTableView tableViewOrders = new GridTableView(RadGrid1);
tableViewOrders.DataSourceID = "SqlDataSource2";
tableViewOrders.DataKeyNames = new string[] { "OrderID" };
GridRelationFields relationFields = new GridRelationFields();
relationFields.MasterKeyField = "CustomerID";
relationFields.DetailKeyField = "CustomerID";
tableViewOrders.ParentTableRelation.Add(relationFields);
RadGrid1.MasterTableView.DetailTables.Add(tableViewOrders);
Please refer to this help article for more details:
http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/defining-structure/creating-a-radgrid-programmatically#creating-a-hierarchical-grid-programmatically
First of all , because of the life cicle of a asp page. You can't access to a event on a detail table.
If you need to access detail tables , items etc ..
You need to add an method to the PreRender in the MasterTableView like this:
<MasterTableView DataSourceID="myDataSource"
AllowMultiColumnSorting="True"
DataKeyNames="Key1,Key2,KeyN"
HierarchyDefaultExpanded="True"
OnPreRender="Unnamed_PreRender" >
The method will recursively iterate through the grid.
The way you do it can change depending on your HieararchyLoadMode.
So this is my way to do it, easiest way exist if you are on Client or Serverbind mode.
Traversing and load mode by the telerik doc .
I'm pretty sure you don't want to :
"populate each row with a detail table one by one manually"
You want to have Multiple table at a Sub Level in your grid and display the rigth one programmatically.
And this is can be done in two easy step:
1/. Create every Detail table in your apsx page.
Please refer to this documentation for more information :
Several tables at a level
2/. Handle the display:
protected void Unnamed_PreRender(object sender, EventArgs e)
{
if (!IsPostBack) myControler(MASTERGRID.MasterTableView);
}
private void myControler(GridTableView gridTableView)
{
GridItem[] nestedViewItems = gridTableView.GetItems(GridItemType.NestedView);
foreach (GridNestedViewItem nestedViewItem in nestedViewItems)
{
foreach (GridTableView nestedView in nestedViewItem.NestedTableViews)
{
if (nestedView.Name == "mytable12" && nestedView.Items.Count == 0)
{ HideExpandColumn(nestedView, nestedView.ParentItem["ExpandColumn"]); }
else if (nestedView.Name == "mytable23")
{
if (nestedView.Items.Count == 0)//
HideExpandColumn(nestedView, nestedView.ParentItem["ExpandColumn"]);
else
{ }
}
if (nestedView.HasDetailTables)
{ myControler(nestedView); }
}
}
}
private void HideExpandColumn(GridTableView _GNVI, TableCell _cell)
{
if (_cell.Controls.Count > 0)
{
_cell.Controls[0].Visible = false;
_cell.Text = " ";
}
_GNVI.Visible = false;
}
You can hide a detail table using :
HideExpandColumn(nestedView, nestedView.ParentItem["ExpandColumn"]);
Or you can hide the parent of the detail table you tested using the detail table that is in param of the controler :
HideExpandColumn(gridTableView, nestedView.ParentItem["ExpandColumn"]);
HideExpandColumn will hide the expand control that stay sometimes even if you hide th detail table.
Bonus: If you need to access to a control in a detail table.
You can use this:
public static class ControlExtensions
{
public static Control FindIt(this Control control, string id)
{
if (control == null) return null;
Control ctrl = control.FindControl(id);
if (ctrl == null)
{
foreach (Control child in control.Controls)
{
ctrl = FindIt(child, id);
if (ctrl != null) break;
}
}
return ctrl;
}
}
Calling it in your controler like this :
else if (nestedView.Name == "DetailPV")
{
if (nestedView.Items.Count == 0)
HideExpandColumn(gridTableView, nestedView.ParentItem["ExpandColumn"]);
else
{
RadLabel ctrl = (RadLabel)this.FindIt("RadLabel11");
ctrl.Text += "<b>" + nestedView.Items.Count.ToString() + "</b>";
}
I have done grouping of the grid by giving groupindex to a particular column in aspxgridview.
For example, if I am grouping by means of persons name and the orders details made by that particular person would come in the detailed content when the arrow is clicked to view the content.
When I click on the header fields to sort, it is sorting the data inside the groupContent but it is not used for sorting the data of groupsummary
I am showing all the totals as a part of group summary besides the person's name.
For example if you see in the below link:
https://demos.devexpress.com/ASPxGridViewDemos/Summary/GroupSortBySummary.aspx
If you sort by company name, the content would be sorted, but the summary showing the country and sum has no means to get sorted at outside level.
Please do suggest me options to work out this problem.
Thanks.
Here is workaround, based on this example.
The main idea is to create summary item which shows the minimum or maximum value of Country column inside City group and sort City group by this summary values. For this BeforeColumnSortingGrouping event is used to change the sorting behavior.
Here is example:
<dx:ASPxGridView ...
OnBeforeColumnSortingGrouping="gridCustomers_BeforeColumnSortingGrouping">
private void SortByCountry()
{
gridCustomers.GroupSummary.Clear();
gridCustomers.GroupSummarySortInfo.Clear();
var sortOrder = gridCustomers.DataColumns["Country"].SortOrder;
SummaryItemType summaryType = SummaryItemType.None;
switch (sortOrder)
{
case ColumnSortOrder.None:
return;
break;
case ColumnSortOrder.Ascending:
summaryType = SummaryItemType.Min;
break;
case ColumnSortOrder.Descending:
summaryType = SummaryItemType.Max;
break;
}
var groupSummary = new ASPxSummaryItem("Country", summaryType);
gridCustomers.GroupSummary.Add(groupSummary);
var sortInfo = new ASPxGroupSummarySortInfo();
sortInfo.SortOrder = sortOrder;
sortInfo.SummaryItem = groupSummary;
sortInfo.GroupColumn = "City";
gridCustomers.GroupSummarySortInfo.AddRange(sortInfo);
}
protected void Page_Load(object sender, EventArgs e)
{
SortByCountry();
}
protected void gridCustomers_BeforeColumnSortingGrouping(object sender, ASPxGridViewBeforeColumnGroupingSortingEventArgs e)
{
SortByCountry();
}
When you group by a column devexpress automatically uses that column to sort. Without sorting the data the grouping is not possible. To overcome this issue we have sorted the datasource itself then applied that datasource to the grid.
How do I show a custom message in the table wizard when table has no data. I am working with Telerik Reports Q1 2011.
There is NoDataMessage property of table item. You can add epression and the message will be displayed. Also, you can give styling to NoDataMessage. Or go to itemdatabound event of table item and then set the value for no data message.
private void table1_ItemDataBound(object sender, EventArgs e)
{
//Take the Telerik.Reporting.Processing.DataItem instance
Telerik.Reporting.Processing.Table tbl = Telerik.Reporting.Processing.DataItem)sender;
//Check if data is retrieved by graph or not.
if (table1.Items.Count == 0)
{
//If no data retrieved, then set the NoDataMessage property.
tbl.NoDataMessage = "No Data Found";
}
}
Link:
http://www.telerik.com/help/reporting/report-structure-dataitem-set-no-data-message.html
well the problem is that i am trying to get DDL to:
1. Recive catagories from a DB tabel - working
2. OnChange select from a different table the products by the item in the DDL - working
had a problem with No1 but fixed that problem. i found out that to get No1 working i have to use postback. did that and every thing in that part is working well and actualy every thing is working...but my hug problem (and i cant find any good answer for it) is that every time i change the item i a getting all the times all over again(i have initialy 8 item - secont time 16 - 24 etc....)
tried to use: ddlCatagories.Items.Clear();
when i use that i am not getting any duplicates but then, i am not getting any thing, it takes the first catagory from the list every time, no matter what i chose in the list..
trying to figure it out for the past week...please help :-)
public partial class selectNamesFromCatagories : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
ddlCatagories.Items.Clear();
SqlDataReader dr = DbHelper.ExecuteReader(
sqlConn1.home,
"spSelectNamesFromCatagories");
while (dr.Read())
{
ListItem li = new ListItem(dr["CategoryName"].ToString());
ddlCatagories.Items.Add(li);
}
dr.Close();
}
protected void ddlCatagories_SelectedIndexChanged(object sender, EventArgs e)
{
SqlDataReader dr = DbHelper.ExecuteReader(
sqlConn1.home,
"spProductsByCatagoryID",
new SqlParameter("#catName", ddlCatagories.Text)
);
while (dr.Read())
{
TableRow tr = new TableRow();
for (int i = 0; i < dr.FieldCount; i++)
{
TableCell td = new TableCell();
td.Text = dr[i].ToString();
tr.Controls.Add(td);
}
tblProductsByCatagories.Controls.Add(tr);
}
}
}
Only populate the DropDownList on first load by checking whether the page has not posted back ie.
if (!Page.IsPostBack)
{
// Populate list
}
I agree with Dan and would add the following as well if you have any ajax enabled controls as they may generate callbacks.
if (!Page.IsPostBack && !Page.IsCallBack)
{
// Populate list
}