Controls / TreeList / Control Lifecycle
This article elaborates on the event sequence of the RadTreeList control in the cases when ViewState is enabled or disabled.
- RadTreeList with EnableViewState set to true (default value)
| First page load: |
| Page.Load |
| NeedDataSource |
| Foreach Item in RadTreeList: |
| ItemCreated |
| ItemDataBound |
| Page.PreRender |
| Normal postback from a control outside of RadTreeList: |
| For each Item in RadTreeList: |
| ItemCreated |
| Page.Load |
| Postback Events |
| Page.PreRender |
| On server selection from TreeListSelectColumn/LinkButton/PushButton/ImageButton with CommandName Select or Deselect (part of the RadTreeList body): |
| For each Item in RadTreeList: |
| ItemCreated |
| Page.Load |
| ItemCommand |
| Other postback events |
| Page.PreRender |
| On server selection from TreeListSelectColumn/LinkButton/PushButton/ImageButton with CommandName Select or Deselect (part of the RadTreeList body) when AllowRecursiveSelection="true" : |
| For each Item in RadTreeList: |
| ItemCreated |
| Page.Load |
| ItemCommand |
| NeedDataSource |
| Foreach Item in RadTreeList: |
| ItemCreated |
| ItemDataBound |
| Other postback events |
| Page.PreRender |
| On expand/collapse action and paging/sorting operation or Edit/InitInsert/Cancel/Delete/Update/PerformInsert command |
| For each Item: |
| ItemCreated |
| Page.Load |
| ItemCommand |
| PageIndexChanged/PageSizeChanged/Sorting/ItemCommand |
| NeedDataSource |
| For each Item: |
| ItemCreated |
| ItemDataBound |
| Page.PreRender |
- RadTreeList with EnableViewState set to false
| First page load: |
| Page.Load |
| NeedDataSource |
| Foreach Item in RadTreeList: |
| ItemCreated |
| ItemDataBound |
| Page.PreRender |
| Normal postback from a control outside of RadTreeList: |
| Page.Load |
| NeedDataSource |
| For each Item in RadTreeList: |
| ItemCreated |
| ItemDataBound |
| Postback Events |
| Page.PreRender |
| On server selection/recursive selection from TreeListSelectColumn/LinkButton/PushButton/ImageButton with CommandName Select or Deselect (part of the RadTreeList body): |
| Page.Load |
| NeedDataSource |
| For each Item in RadTreeList: |
| ItemCreated |
| ItemDataBound |
| ItemCommand |
| Other postback events |
| Page.PreRender |
| On expand/collapse action or paging/sorting operation or Edit/InitInsert/Cancel/Delete/Update/PerformInsert command |
| Page.Load |
| NeedDataSource |
| For each Item in RadTreeList: |
| ItemCreated |
| ItemDataBound |
| ItemCommand |
| PageIndexChanged/PageSizeChanged/Sorting/ItemCommand |
| NeedDataSource |
| For each Item in RadTreeList: |
| ItemCreated |
| ItemDataBound |
| Page.PreRender |