Filtering data on load in a RadGrid FilterTemplate - radgrid

Question

I have a RadGrid which has a FilterTemplate using a RadComboBox. When I load the data in RadGrid, I want to show the user filtered data. Here is my column:
<telerik:GridTemplateColumn FilterControlAltText="Filter tclmArrangement column"
HeaderText="Arrangement" UniqueName="tclmArrangement" DefaultInsertValue="-"
DataField="IsDemoAssigned">
<HeaderStyle Width="2%" />
<ItemTemplate>
<asp:Repeater ID="rptchkarrangement" runat="server"
DataSource='<%# IIf(DataBinder.Eval(Container, "DataItem.IsDEmoAssigned") = 0,
DataBinder.Eval(Container, "DataItem.Employees"), Nothing)%> '>
<ItemTemplate>
<table>
<tr class="clsParent">
<input type="checkbox" class="clsEmployee" id="cbSelect"
checked='<%# DataBinder.Eval(Container, "DataItem.IsAssigned")%>'
runat="server" />
</tr>
</table>
</ItemTemplate>
</asp:Repeater>
</ItemTemplate>
<FilterTemplate>
<telerik:RadComboBox ID="RadComboBoxAssignmentStatus" Height="80px" Width="80px"
AppendDataBoundItems="true" runat="server"
OnClientSelectedIndexChanged="AssignmentStatusIndexChanged">
</telerik:RadComboBox>
<telerik:RadScriptBlock ID="rsbAssignmentStatus" runat="server">
<script type="text/javascript">
function AssignmentStatusIndexChanged(sender, args) {
var tableView = $find("<%# TryCast(Container,GridItem)
.OwnerTableView.ClientID %>");
var selectedValue = sender.get_value();
if (selectedValue) {
if (parseInt(selectedValue) < 0) {
tableView.filter("tclmArrangement", selectedValue, "NoFilter");
}
else {
tableView.filter("tclmArrangement", selectedValue, "EqualTo");
}
}
}
</script>
</telerik:RadScriptBlock>
</FilterTemplate>
</telerik:GridTemplateColumn>
The filter works fine when the complete data is displayed initially using All option. Filter has values (All, Assigned and UnAssigned). How do I show data in the RadGrid which falls under UnAssigned category?

Answer 1

Not sure is this what you want but I filter through the GridTemplateColumn DataFields. I have removed the repeater.
I hope this help you
.aspx
<telerik:RadGrid ID="rg" runat="server" AutoGenerateColumns="false"
OnNeedDataSource="rg_NeedDataSource" AllowFilteringByColumn="true">
<MasterTableView>
<Columns>
<telerik:GridTemplateColumn DataField="IsAssigned" DefaultInsertValue="-"
UniqueName="tclmArrangement">
<HeaderStyle Width="2%" />
<ItemTemplate>
<asp:CheckBox ID="chk" runat="server"
Checked='<%# Eval("IsAssigned") %>' />
<asp:Label ID="lbl" runat="server" Text='<%# Eval("EmployeeName") %>'>
</asp:Label>
</ItemTemplate>
<FilterTemplate>
<telerik:RadComboBox ID="rcbAssignmentStatus" Height="80px" Width="80px"
runat="server"
OnClientSelectedIndexChanged="AssignmentStatusIndexChanged"
SelectedValue='<%# ((GridItem)Container)
.OwnerTableView
.GetColumn("tclmArrangement").CurrentFilterValue %>'>
<Items>
<telerik:RadComboBoxItem Text="All" Value="" />
<telerik:RadComboBoxItem Text="All Assigned" Value="true" />
<telerik:RadComboBoxItem Text="Unassigned" Value="false" />
</Items>
</telerik:RadComboBox>
<telerik:RadCodeBlock ID="rcb" runat="server">
<script type="text/javascript">
function AssignmentStatusIndexChanged(sender, args) {
var tableView = $find('<%# ((GridItem)Container)
.OwnerTableView.ClientID %>');
var value = sender.get_selectedItem().get_value();
if (value != "")
tableView.filter('tclmArrangement', args.get_item()
.get_value(), 'EqualTo');
else
tableView.filter('tclmArrangement', args.get_item()
.get_value(), 'NoFilter')
}
</script>
</telerik:RadCodeBlock>
</FilterTemplate>
</telerik:GridTemplateColumn>
</Columns>
</MasterTableView>
</telerik:RadGrid>
.cs
protected void Page_Load(object sender, EventArgs e)
{
// Check
if (!IsPostBack)
{
// Variable
DataTable dt = new DataTable();
dt.Columns.Add("IsAssigned", typeof(bool));
dt.Columns.Add("EmployeeName", typeof(string));
string[] employeeName = { "Patrick", "Bucky", "Henry", "Jesus", "Linda" };
int[] isAssigned = { 1, 1, 0, 0, 0 };
// Loop
for (int i = 0; i < employeeName.Length; i++)
dt.Rows.Add(isAssigned[i], employeeName[i]);
ViewState["Data"] = dt;
rg.DataSource = dt;
rg.DataBind();
dt.Dispose();
}
}
protected void rg_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
rg.DataSource = ViewState["Data"] as DataTable;
}

Answer 2

This link helped me.
http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/functionality/filtering/how-to/apply-default-filter-on-initial-load
One thing which is not specified in the link is to set "EnableLinqExpression=false"
I chose to take "Setting the initial filter in the code-behind" approach. Filter expressions can be formed as follows.
http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/functionality/filtering/how-to/operate-with-the-filterexpression-manually