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The DetailsView control can be displayed in three modes, depending on the value of the DetailsViewMode enumeration ReadOnly, Insert, or Edit. The read-only mode is the default display mode, in which users see only the contents of the record. To edit or add a new record, users must click the corresponding button (if any) on the command bar. Each mode has an associated style. The current mode is tracked by the CurrentMode read-only property. Other state properties are listed in Table 7-14.
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Table 7-14 DetailsView State Properties
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Property BottomPagerRow CurrentMode
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Description Returns a DetailsViewRow object that represents the bottom pager of the control. Gets the current mode for the control any of the values in the DetailsViewMode enumeration. The property determines how bound fields and templates are rendered. Returns the DataKey object for the currently displayed record. The DataKey object contains the key values corresponding to the key fields specified by DataKeyNames. An array specifying the primary key fields for the records being displayed. These keys are used to uniquely identify an item for update and delete operations. Returns a DetailsViewRow object that represents the footer of the control. Returns a DetailsViewRow object that represents the header of the control. Returns the total number of items in the underlying data source bound to the control. Returns the 0-based index for the currently displayed record in the control. The index is relative to the total number of records in the underlying data source. Returns the collection of DataControlField objects for the control that was used to generate the Rows collection. Returns a collection of DetailsViewRow objects representing the individual rows within the control. Only data rows are taken into account. Returns the value of the key for the current record as stored in the DataKey object. Returns a DetailsViewRow object that represents the top pager of the control.
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FooterRow HeaderRow PageCount PageIndex
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Rows Rows
SelectedValue TopPagerRow
C07620245.fm Page 234 Tuesday, June 8, 2004 6:23 PM
Part II
Data Access
If you re not satisfied with the default control rendering, you can use certain templates to better adapt the user interface to your preferences. Table 7-15 details the supported templates.
Table 7-15
DetailsView Template Properties
Description The template for rendering the control when it is bound to an empty data source. If set, this property overrides the EmptyDataText property. The template for rendering the footer row of the control. The template for rendering the header of the control. The template for rendering the pager of the control. If set, this property overrides any existing pager settings.
Property EmptyDataTemplate
FooterTemplate HeaderTemplate PagerTemplate
As you can see, the table lists templates related to the layout of the control and doesn t include templates that influence the rendering of the current record. This is by design. For properties such as InsertTemplate or ItemTemplate, you should resort to the FormView control, which is just a fully templatized version of the DetailsView control. The DetailsView control has only one method, ChangeMode. As the name suggests, the ChangeMode method is used to switch from one display mode to the next.
public void ChangeMode(DetailsViewMode newMode)
This method is used internally to change view when a command button is clicked.
Events of the DetailsView
The DetailsView control exposes several events that enable the developer to execute custom code at various times in the life cycle. The event model is similar to GridView in terms of supported events and because of the pre/post pair of events that characterize each significant operation. Table 7-16 details the supported events. The ItemCommand event fires only if the original click event is not handled by a predefined method. This typically occurs if you define custom buttons in one of the templates. You do not need to handle this event to intercept any clicking on the Edit or Insert buttons.
C07620245.fm Page 235 Tuesday, June 8, 2004 6:23 PM
7
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Table 7-16 Events of the DetailsView Control
Event PageIndexChanging, PageIndexChanged ItemCommand
Description Both events occur when the control moves to another record. They fire before and after the display change occurs. Occurs when any of the clickable elements in the user interface is clicked. This doesn t include standard buttons (such as Edit, Delete, and Insert), which are handled internally, but it does include custom buttons defined in the templates. Occurs after all the rows are created. Both events occur when the current record is deleted. They fire before and after the record is deleted. Both events occur when a new record is inserted. They fire before and after the insertion. Both events occur when the current record is updated. They fire before and after the row is updated. Both events occur when the control switches to a different display mode. They fire before and after the mode changes.
ItemCreated ItemDeleting, ItemDeleted ItemInserting, ItemInserted ItemUpdating, ItemUpdated ModeChanging, ModeChanged
The PageIndexChanging event allows you to execute custom code before the PageIndex actually changes (before the control moves to a different record). As with the GridView events, you can cancel the event by setting the Cancel property of the event argument class to true.
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