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Using Input Controls Inside Data-Bound Controls

You can embed RadInput controls in a data-bound control and use it for editing. When the data-bound controlcreates the RadTextBox, RadNumericTextBox, RadDateInput, or RadMaskedTextBox control as part of its own rendering, it can extract the input values.

When embedding RadInput controls inside a data-bound control, you must use a data-binding expression to bind the value of the input control to the data source of the parent control. Data-binding expressions are contained within <%# and %> delimiters and use the Eval and Bind functions. The Eval function is used to define one-way (read-only) binding. The Bind function is used for two-way (updatable) binding.

note

In addition to calling Eval and Bind methods to perform data binding in a data-binding expression, you can call any publicly scoped code within the <%# and %> delimiters to execute that code and return a value during page processing.

The following table shows the properties of the various RadInput controls to bind when using them within a data-bound control:

 

RadInput control Bindable property
RadTextBox Text
RadNumericTextBox DbValue
RadMaskedTextBox Text
RadDateInput DbSelectedDate
caution

With RadNumericTextbox and RadDateInput , use the DbValue and DbSelectedDate properties rather than the Value and SelectedDate properties. The "Db" properties differ from the counterparts you usually use in that they do not throw an exception if the new value is null, string, or DBNull. Setting a DbNull value will internally revert the DbNull to an empty value.

The following example shows how to use the different RadInput controls inside a databound control (in this case, RadGrid):

        <telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server" DataSourceID="SqlDataSource1" GridLines="None">
            <MasterTableView AutoGenerateColumns="False" DataKeyNames="id" AllowAutomaticDeletes="true"
                AllowAutomaticInserts="true" AllowAutomaticUpdates="true" DataSourceID="SqlDataSource1">
                <RowIndicatorColumn CurrentFilterFunction="NoFilter" FilterListOptions="VaryByDataType"
                    Visible="False">
                </RowIndicatorColumn>
                <Columns>
                    <telerik:GridEditCommandColumn CurrentFilterFunction="NoFilter" FilterListOptions="VaryByDataType">
                    </telerik:GridEditCommandColumn>
                    <telerik:GridTemplateColumn HeaderText="TextData" UniqueName="TextData">
                        <ItemTemplate>
                            <telerik:RadTextBox RenderMode="Lightweight" Text='<%# Eval("TextData") %>' ID="DisplayTextBox" runat="server"
                                ReadOnly="true">
                            </telerik:RadTextBox>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <telerik:RadTextBox RenderMode="Lightweight" Text='<%# Bind("TextData") %>' ID="EditTextBox" runat="server">
                            </telerik:RadTextBox>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                    <telerik:GridTemplateColumn HeaderText="NumericData" UniqueName="NumericData">
                        <ItemTemplate>
                            <telerik:RadNumericTextBox RenderMode="Lightweight" DbValue='<%# Eval("NumericData") %>' ID="DisplayNumericTextBox"
                                runat="server" ReadOnly="true">
                            </telerik:RadNumericTextBox>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <telerik:RadNumericTextBox RenderMode="Lightweight" DbValue='<%# Bind("NumericData") %>' ID="EditNumericTextBox"
                                runat="server">
                            </telerik:RadNumericTextBox>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                    <telerik:GridTemplateColumn HeaderText="MaskedData" UniqueName="MaskedData">
                        <ItemTemplate>
                            <telerik:RadMaskedTextBox RenderMode="Lightweight" Text='<%# Eval("MaskedData") %>' ID="DisplayMaskedTextBox"
                                runat="server" Mask="###-####" ReadOnly="true">
                            </telerik:RadMaskedTextBox>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <telerik:RadMaskedTextBox RenderMode="Lightweight" Text='<%# Bind("MaskedData") %>' Mask="###-####" ID="EditMaskedTextBox"
                                runat="server">
                            </telerik:RadMaskedTextBox>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                    <telerik:GridTemplateColumn HeaderText="DateData" UniqueName="DateData">
                        <ItemTemplate>
                            <telerik:RadDateInput RenderMode="Lightweight" DbSelectedDate='<%# Eval("DateData") %>' ID="DisplayDateInput"
                                runat="server" ReadOnly="true">
                            </telerik:RadDateInput>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <telerik:RadDateInput RenderMode="Lightweight" DbSelectedDate='<%# Bind("DateData") %>' ID="EditDateInput"
                                runat="server">
                            </telerik:RadDateInput>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                </Columns>
            </MasterTableView></telerik:RadGrid>

See Also