Class TreeViewEvents<TValue>

The TreeView allows us to control the component by using events.

Inheritance

System.Object

TreeViewEvents<TValue>

Namespace: Syncfusion.Blazor.Navigations

Assembly: Syncfusion.Blazor.dll

Syntax

public class TreeViewEvents<TValue> : OwningComponentBase

Type Parameters

Name	Description
TValue	"TValue parameter".

Constructors

TreeViewEvents()

Declaration

public TreeViewEvents()

Properties

Created

Gets or sets an event callback that is raised when the TreeView component is created successfully.

Declaration

public EventCallback<ActionEventArgs> Created { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<ActionEventArgs>	An event callback function.

Remarks

You can perform required actions during this component creation.

DataBound

Gets or sets an event callback that is raised when data source is populated in the TreeView.

Declaration

public EventCallback<DataBoundEventArgs<TValue>> DataBound { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<DataBoundEventArgs<TValue>>	An event callback function.

Remarks

The data can be modified or updated at this time when the component is updated with data source.

DataSourceChanged

Gets or sets an event callback that is raised when data source is changed in the TreeView. The data source will be changed after performing some operation like drag and drop, node editing, adding and removing node.

Declaration

public EventCallback<DataSourceChangedEventArgs<TValue>> DataSourceChanged { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<DataSourceChangedEventArgs<TValue>>	An event callback function.

Remarks

The data source change can be detected and the updated data can be fetched or stored in required cases.

Destroyed

Gets or sets an event callback that is raised when the TreeView control is destroyed successfully.

Declaration

public EventCallback<ActionEventArgs> Destroyed { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<ActionEventArgs>	An event callback function.

Remarks

Required actions can be performed once the component is destroyed.

NodeChecked

Gets or sets an event callback that is raised when the TreeView node is checked/unchecked successfully.

Declaration

public EventCallback<NodeCheckEventArgs> NodeChecked { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeCheckEventArgs>	An event callback function.

Remarks

The details of checked/unchecked node can be fetched and required actions can be performed using this event.

NodeChecking

Gets or sets an event callback that is raised before the TreeView node is to be checked/unchecked.

Declaration

public EventCallback<NodeCheckEventArgs> NodeChecking { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeCheckEventArgs>	An event callback function.

Remarks

Check/uncheck action can be prevented for specific nodes in required cases.

NodeClicked

Gets or sets an event callback that is raised when the TreeView node is clicked successfully.

Declaration

public EventCallback<NodeClickEventArgs> NodeClicked { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeClickEventArgs>	An event callback function.

Remarks

Required actions can be performed on node click using this event.

NodeCollapsed

Gets or sets an event callback that is raised when the TreeView node collapses successfully.

Declaration

public EventCallback<NodeExpandEventArgs> NodeCollapsed { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeExpandEventArgs>	An event callback function.

Remarks

Helps to identify that a node is collapsed and the collapsed node details can be fetched in this event.

NodeCollapsing

Gets or sets an event callback that is raised before the TreeView node collapses.

Declaration

public EventCallback<NodeExpandEventArgs> NodeCollapsing { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeExpandEventArgs>	An event callback function.

Remarks

Collapse action can be prevented for specific nodes in required cases.

NodeDropped

Gets or sets an event callback that is raised when the TreeView node is dropped on target element successfully.

Declaration

public EventCallback<DragAndDropEventArgs> NodeDropped { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<DragAndDropEventArgs>	An event callback function.

Remarks

Helps to identify the node drop action and the dropped index/target can be fetched to perform required actions.

NodeEdited

Gets or sets an event callback that is raised when the TreeView node is renamed successfully.

Declaration

public EventCallback<NodeEditEventArgs> NodeEdited { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeEditEventArgs>	An event callback function.

Remarks

Helps to identify that the node is edited successfully and the new edited text can be obtained here.

NodeEditing

Gets or sets an event callback that is raised before the TreeView node is renamed.

Declaration

public EventCallback<NodeEditEventArgs> NodeEditing { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeEditEventArgs>	An event callback function.

Remarks

Node editing can be prevented for specific nodes using this event.

NodeExpanded

Gets or sets an event callback that is raised when the TreeView node expands successfully.

Declaration

public EventCallback<NodeExpandEventArgs> NodeExpanded { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeExpandEventArgs>	An event callback function.

Remarks

Helps to identify that a node is expanded and the expanded node details can be fetched using this event.

NodeExpanding

Gets or sets an event callback that is raised before the TreeView node is to be expanded.

Declaration

public EventCallback<NodeExpandEventArgs> NodeExpanding { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeExpandEventArgs>	An event callback function.

Remarks

Expand action can be prevented for specific nodes in required cases using this event.

NodeSelected

Gets or sets an event callback that is raised when the TreeView node is selected/unselected successfully.

Declaration

public EventCallback<NodeSelectEventArgs> NodeSelected { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeSelectEventArgs>	An event callback function.

Remarks

Selected node details can be obtained here and updated to required places using this event.

NodeSelecting

Gets or sets an event callback that is raised before the TreeView node is selected/unselected.

Declaration

public EventCallback<NodeSelectEventArgs> NodeSelecting { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeSelectEventArgs>	An event callback function.

Remarks

A specific node selection can be prevented using this event.

OnActionFailure

Gets or sets an event callback that is raised while any TreeView action failed to fetch the desired results.

Declaration

public EventCallback<FailureEventArgs> OnActionFailure { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<FailureEventArgs>	An event callback function.

Remarks

You can capture this failure and throw error message for users in required cases.

OnKeyPress

Gets or sets an event callback that is raised when key press is successful.

Declaration

public EventCallback<NodeKeyPressEventArgs> OnKeyPress { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeKeyPressEventArgs>	An event callback function.

Remarks

Helps to customize the operations at key press.

OnNodeDragged

Gets or sets an event callback that is raised when the TreeView node is dragged.

Declaration

public EventCallback<DragAndDropEventArgs> OnNodeDragged { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<DragAndDropEventArgs>	An event callback function.

Remarks

Helps to identify the node drag action.

OnNodeDragStart

Gets or sets an event callback that is raised when the TreeView node drag (move) starts.

Declaration

public EventCallback<DragAndDropEventArgs> OnNodeDragStart { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<DragAndDropEventArgs>	An event callback function.

Remarks

Helps to identify the dragged node details.Dragging can be prevented for specific node in required cases.

OnNodeDragStop

Gets or sets an event callback that is raised when the TreeView node dragging (move) stops.

Declaration

public EventCallback<DragAndDropEventArgs> OnNodeDragStop { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<DragAndDropEventArgs>	An event callback function.

Remarks

Helps to identify the node drag stop action.Dropped target can be fetched and used to perform required actions.

OnNodeRender

Gets or sets an event callback that is raised before the TreeView node is appended to the TreeView element.

Declaration

public EventCallback<NodeRenderEventArgs<TValue>> OnNodeRender { get; set; }

Property Value

Type	Description
Microsoft.AspNetCore.Components.EventCallback<NodeRenderEventArgs<TValue>>	An event callback function.

Remarks

A specific node can be customized at the time of rendering using this event.

Methods

OnInitializedAsync()

Method invoked when the component is ready to start.

Declaration

protected override Task OnInitializedAsync()

Returns

Type	Description
System.Threading.Tasks.Task	A System.Threading.Tasks.Task representing any asynchronous operation.