ASPxTreeList.ClientLayout Event
Enables you to save and restore the previously saved layout of the ASPxTreeList.
Namespace: DevExpress.Web.ASPxTreeList
Assembly: DevExpress.Web.ASPxTreeList.v23.1.dll
NuGet Package: DevExpress.Web
Declaration
Event Data
The ClientLayout event's data class is ASPxClientLayoutArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| LayoutData | Gets or sets the layout data. |
| LayoutMode | Indicates whether a control’s layout should be saved or restored. |
Remarks
Handle the ClientLayout event to save and restore the tree list’s layout from a data store.
Save Layout
The event parameter’s ASPxClientLayoutArgs.LayoutMode property returns ClientLayoutMode.Saving. The ASPxClientLayoutArgs.LayoutData property contains the tree list’s current layout that should be saved, for example, to a database.
To control what information on the layout can be saved, use the options provided by the ASPxTreeList.SettingsCookies property. For example, use the SettingsCookies‘ TreeListSettingsCookies.StoreColumnsVisiblePosition property to store visible columns position:
Restore Layout
The ASPxClientLayoutArgs.LayoutMode property returns ClientLayoutMode.Loading. Read the tree list’s layout data from a data store and assign it to the ASPxClientLayoutArgs.LayoutData property.
You can also save and restore the tree list’s layout by using the ASPxTreeList.SaveClientLayout and ASPxTreeList.LoadClientLayout methods.
Example
This example shows how to save/restore the ASPxTreeList’s layout to/from a data store.
protected void ASPxTreeList1_ClientLayout(object sender,
DevExpress.Web.ASPxClientLayoutArgs e) {
if (e.LayoutMode == DevExpress.Web.ClientLayoutMode.Saving) {
SaveUserLayoutToDatabase(userID, "AccountTreeList", e.LayoutData);
}
else {
if (System.IO.File.Exists(fileName))
e.LayoutData = RestoreUserLayoutFromDatabase(userID, "AccountTreeList");
}
}