React TreeList Events

This section describes events raised by this widget.

adaptiveDetailRowPreparing

Raised before an adaptive detail row is rendered.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
formOptions	Object	The options of the Form widget.

Main article: onAdaptiveDetailRowPreparing

cellClick

Raised when a cell is clicked or tapped.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
jQueryEvent	jQuery.Event	Use 'event' instead. The jQuery event that caused the handler execution. Deprecated in favor of the event field.
event	Event (jQuery or EventObject)	The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.
data	Object	The data of the row to which the cell belongs. Available if the rowType is "data", "detail" or "detailAdaptive".
key	any	The row's key. Available if the rowType is "data", "detail" or "detailAdaptive". For plain data, the key value depends on the keyExpr option. For hierarchical data, the key is generated automatically or set in the underlying Store of the data source.
value	any	The cell's raw value. Available if the rowType is "data".
displayValue	any	The cell's displayed value. Available if the rowType is "data". Differs from the value field only when the cell belongs to the lookup column.
text	String	The cell's formatted value converted to a string. Available if the rowType is "data".
columnIndex	Number	The index of the column to which the cell belongs.
column	Object	This column's configuration.
rowIndex	Number	The index of the row to which the cell belongs. Refer to Column and Row Indexes for more information.
rowType	String	The row's type.
cellElement	HTMLElement \| jQuery	The cell's container. It is an HTML Element or a jQuery Element when you use jQuery.
row	TreeList Row	The row properties. Available if the rowType is "data", "detail" or "detailAdaptive".

Main article: onCellClick

cellHoverChanged

Raised when the pointer enters or leaves a cell.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
eventType	String	Indicates whether the pointer entered or left the cell. Can be either "mouseover" or "mouseout".
data	Object	The data of the row to which the cell belongs. Available if the rowType is "data", "detail" or "detailAdaptive".
key	any	The row's key. Available if the rowType is "data", "detail" or "detailAdaptive". For plain data, the key value depends on the keyExpr option. For hierarchical data, the key is generated automatically or set in the underlying Store of the data source.
value	any	The cell's raw value. Available if the rowType is "data".
text	String	The cell's formatted value converted to a string. Available if the rowType is "data".
displayValue	any	The cell's displayed value. Available if the rowType is "data". Differs from the value field only when the cell belongs to the lookup column.
columnIndex	Number	The index of the column to which the cell belongs.
rowIndex	Number	The index of the row to which the cell belongs. Refer to Column and Row Indexes for more information.
column	TreeList Column	This column's configuration.
rowType	String	The row's type.
cellElement	HTMLElement \| jQuery	The cell's container. It is an HTML Element or a jQuery Element when you use jQuery.
row	TreeList Row	The row properties. Available if the rowType is "data", "detail" or "detailAdaptive".

Main article: onCellHoverChanged

cellPrepared

Raised after a cell is created.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
data	Object	The data of the row to which the cell belongs. Available if the rowType is "data", "detail" or "detailAdaptive".
key	any	The row's key. Available if the rowType is "data", "detail" or "detailAdaptive". For plain data, the key value depends on the keyExpr option. For hierarchical data, the key is generated automatically or set in the underlying Store of the data source.
value	any	The cell's raw value. Available if the rowType is "data".
displayValue	any	The cell's displayed value. Available if the rowType is "data". Differs from the value field only when the cell belongs to the lookup column.
text	String	The cell's formatted value converted to a string. Available if the rowType is "data".
columnIndex	Number	The index of the column to which the cell belongs.
column	TreeList Column	This column's configuration.
rowIndex	Number	The row's index. Refer to Column and Row Indexes for more information.
rowType	String	The row's type.
row	TreeList Row	The row properties. Available if the rowType is "data", "detail" or "detailAdaptive".
isSelected	Boolean	Indicates whether the row is selected. Available if rowType is "data" or "detail".
isExpanded	Boolean	Indicates whether the row is expanded or collapsed. Available if rowType is "data" or "detail".
cellElement	HTMLElement \| jQuery	The cell's container. It is an HTML Element or a jQuery Element when you use jQuery.

Main article: onCellPrepared

contentReady

Raised when the widget's content is ready.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name

Type

Description

component

TreeList

The widget's instance.

element

HTMLElement | jQuery

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model

Object

The model data. Available only when using Knockout.

Main article: onContentReady.

contextMenuPreparing

Raised before the context menu is rendered.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
items	Array<Object>	Items to be displayed in the context menu. Their structure is described in the Default Item Template section.
target	String	The name of the element on which the context menu is invoked: "header", "content" or "footer". This field is read-only.
targetElement	HTMLElement \| jQuery	This element's container. It is an HTML Element or a jQuery Element when you use jQuery.
columnIndex	Number	The index of the column on which the context menu is invoked.
column	TreeList Column	This column's configuration.
rowIndex	Number	The index of the row on which the context menu is invoked. Refer to Column and Row Indexes for more information.
row	TreeList Row	The row properties.

Main article: onContextMenuPreparing

dataErrorOccurred

Raised when an error occurs in the data source.

Type:

Event

Function parameters:

e:

Object

Information on the occurred error.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
error	JavaScript Error Object	The standard Error object that defines the error.

Main article: onDataErrorOccurred

disposing

Raised before the widget is disposed of.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.

Name

Type

Description

component

TreeList

The widget instance.

element

HTMLElement | jQuery

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

model

Object

The model data. Available only if you use Knockout.

Main article: onDisposing

editingStart

Raised before a cell or row switches to the editing state.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if Knockout is used.
data	Object	The data of the row to be edited.
key	any	The row's key. The key of an added but not yet saved row is undefined.
cancel	Boolean	Allows you to cancel row editing.
column	Object	The configuration of the column whose cell is switching to the editing state. Available in "cell" or "batch" editing mode.

Main article: onEditingStart

editorPrepared

Raised after an editor is created.

Type:

Event

Function parameters:

options:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
parentType	String	The editor's location. One of "dataRow", "filterRow", "headerRow" or "searchPanel".
value	any	The editor's value.
setValue(newValue, newText)	any	A method that you should call to change the cell value and, optionally, the displayed value after the editor's value is changed.
updateValueTimeout	Number	Gets and sets the delay between the moment a user stops typing a filter value and the moment it is applied. Available if parentType is "filterRow" or "searchPanel".
width	Number	The editor's width; equals null for all editors except for those whose parentType equals "searchPanel".
disabled	Boolean	Indicates whether the editor is disabled.
rtlEnabled	Boolean	Indicates whether the editor uses right-to-left representation.
editorElement	HTMLElement \| jQuery	The editor's container. It is an HTML Element or a jQuery Element when you use jQuery.
readOnly	Boolean	Indicates whether the editor is read-only.
dataField	String	The name of the field that provides data for the column the editor belongs to.
row	TreeList Row	The properties of the row the editor belongs to.

Main article: onEditorPrepared

editorPreparing

Raised before an editor is created.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
parentType	String	The editor's location. One of "dataRow", "filterRow", "headerRow" or "searchPanel".
value	any	The editor's value.
setValue(newValue, newText)	any	A method that you should call to change the cell value and, optionally, the displayed value after the editor's value is changed.
updateValueTimeout	Number	Gets and sets the delay between the moment a user stops typing a filter value and the moment it is applied. Available if parentType is "filterRow" or "searchPanel".
width	Number	The editor's width; equals null for all editors except for those whose parentType equals "searchPanel".
disabled	Boolean	Indicates whether the editor is disabled.
rtlEnabled	Boolean	Indicates whether the editor uses right-to-left representation.
cancel	Boolean	Allows you to cancel creating the editor. Set it to true and implement a custom editor if your scenario requires it.
editorElement	HTMLElement \| jQuery	The editor's container. It is an HTML Element or a jQuery Element when you use jQuery.
readOnly	Boolean	Indicates whether the editor is read-only.
editorName	String	Allows you to change the editor. Accepts names of DevExtreme widgets only, for example, "dxTextBox". Import a new editor's module when using DevExtreme modules.
editorOptions	Object	Gets and sets the editor configuration.
dataField	String	The name of the field that provides data for the column the editor belongs to.
row	TreeList Row	The properties of the row the editor belongs to.

Main article: onEditorPreparing

initialized

Raised only once, after the widget is initialized.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name

Type

Description

component

TreeList

The widget's instance.

element

HTMLElement | jQuery

The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.

Main article: onInitialized

initNewRow

Raised before a new row is added to the widget.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
data	Object	The data of the inserted row; initially empty.

Main article: onInitNewRow

keyDown

Raised when the widget is in focus and a key has been pressed down.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
jQueryEvent	jQuery.Event	Use 'event' instead. The jQuery event that caused the handler execution. Deprecated in favor of the event field.
event	Event (jQuery or EventObject)	The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.
handled	Boolean	Indicates whether the widget has already handled this event.

Main article: onKeyDown

nodesInitialized

Raised after the loaded nodes are initialized.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
root	TreeList Node	The root node.

Main article: onNodesInitialized

optionChanged

Raised after a widget option is changed.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
name	String	The option's short name.
model	Object	The model data. Available only if you use Knockout.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
component	TreeList	The widget's instance.
fullName	String	The option's full name.
value	any	The option's new value.

Main article: onOptionChanged

rowClick

Raised when a row is clicked or tapped.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
jQueryEvent	jQuery.Event	Use 'event' instead. The jQuery event that caused the handler execution. Deprecated in favor of the event field.
event	Event (jQuery or EventObject)	The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.
data	Object	The row's data.
key	any	The row's key. Available if the rowType is "data", "detail" or "detailAdaptive". For plain data, the key value depends on the keyExpr option. For hierarchical data, the key is generated automatically or set in the underlying Store of the data source.
values	Array<Object>	Values displayed in the row cells.
columns	Array<Object>	All column configurations.
rowIndex	Number	The row's index. Refer to Column and Row Indexes for more information.
rowType	String	The row's type.
isSelected	Boolean	Indicates whether the row is selected. Available if rowType is "data" or "detail".
isExpanded	Boolean	Indicates whether the row is expanded or collapsed. Available if rowType is "data" or "detail".
rowElement	HTMLElement \| jQuery	The row's container. It is an HTML Element or a jQuery Element when you use jQuery.
handled	Boolean	Indicates whether internal widget handlers have already handled the event.

Main article: onRowClick

rowCollapsed

Raised after a row is collapsed.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
key	any	The key of the row.

Main article: onRowCollapsed

rowCollapsing

Raised before a row is collapsed.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
key	any	The key of the row.
cancel	Boolean	Allows you to cancel row collapsing.

Main article: onRowCollapsing

rowExpanded

Raised after a row is expanded.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
key	any	The key of the row.

Main article: onRowExpanded

rowExpanding

Raised before a row is expanded.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
key	any	The key of the group or master row.
cancel	Boolean	Allows you to cancel row expansion.

Main article: onRowExpanding

rowInserted

Raised after a new row has been inserted into the data source.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
data	Object	The data of the row.
key	any	The key of the row. If a field providing keys is not specified in the data source, the whole data object is considered the key.
error	JavaScript Error Object	The standard Error object defining an error that may occur during insertion.

Main article: onRowInserted

rowInserting

Raised before a new row is inserted into the data source.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
data	Object	The data of the row that should be inserted.
cancel	Boolean \| Promise<void> (jQuery or native)	true, a Promise resolved with true, or a rejected Promise stops row insertion. false or a Promise resolved with false or undefined continues row insertion.

Main article: onRowInserting

rowPrepared

Raised after a row is created.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
data	Object	The row's data. Available if the rowType is "data", "detail" or "detailAdaptive".
key	any	The row's key. Available if the rowType is "data", "detail" or "detailAdaptive". For plain data, the value of the key depends on the keyExpr option. For hierarchical data, the key is generated automatically or set in the underlying Store of the data source.
values	Array<Object>	Values displayed in the row cells.
columns	Array<TreeList Column>	All column configurations.
rowIndex	Number	The row's index. Refer to Column and Row Indexes for more information.
rowType	String	The row's type.
isSelected	Boolean	Indicates whether the row is selected. Available if rowType is "data" or "detail".
isExpanded	Boolean	Indicates whether the row is expanded or collapsed. Available if rowType is "data" or "detail".
rowElement	HTMLElement \| jQuery	The row's container. It is an HTML Element or a jQuery Element when you use jQuery.

Main article: onRowPrepared

rowRemoved

Raised after a row has been removed from the data source.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
data	Object	The data of the row.
key	any	The key of the row. If a field providing keys is not specified in the data source, the whole data object is considered the key.
error	JavaScript Error Object	The standard Error object defining an error that may occur during removal.

Main article: onRowRemoved

rowRemoving

Raised before a row is removed from the data source.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
data	Object	The data of the row that should be removed.
key	any	The row's key.
cancel	Boolean \| Promise<void> (jQuery or native)	true, a Promise resolved with true, or a rejected Promise stops row removal. false or a Promise resolved with false or undefined continues row removal.

Main article: onRowRemoving

rowUpdated

Raised after a row has been updated in the data source.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
data	Object	The updated data of the row; contains only those fields that have been updated.
key	any	The key of the row. If a field providing keys is not specified in the data source, the whole data object is considered the key.
error	JavaScript Error Object	The standard Error object defining an error that may occur during updating.

Main article: onRowUpdated

rowUpdating

Raised before a row is updated in the data source.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
oldData	Object	The row's old data.
newData	Object	The row's updated data.
key	any	The row's key.
cancel	Boolean \| Promise<void> (jQuery or native)	true, a Promise resolved with true, or a rejected Promise stops row updating. false or a Promise resolved with false or undefined continues row updating.

Main article: onRowUpdating

rowValidating

Raised after cells in a row are validated against validation rules.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
brokenRules	Array<RequiredRule \| NumericRule \| RangeRule \| StringLengthRule \| CustomRule \| CompareRule \| PatternRule \| EmailRule>	An array of broken rules. The structure of rule objects is described in the Validation Rules section.
isValid	Boolean	Indicates whether data in all cells of the row satisfies the validation rules.
key	any	The key of the row. If a field providing keys is not specified in the data source, the whole data object is considered the key.
newData	Object	The data of the validated row after changes.
oldData	Object	The data of the validated row before changes.
errorText	String	An error message to be displayed.

Main article: onRowValidating

selectionChanged

Raised after selecting a row or clearing its selection.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
currentSelectedRowKeys	Array<any>	The keys of the rows that have been selected.
currentDeselectedRowKeys	Array<any>	The keys of the rows whose selection has been cleared.
selectedRowKeys	Array<any>	The keys of all selected rows.
selectedRowsData	Array<Object>	The data of all selected rows. Does not include calculated values.

Main article: onSelectionChanged

toolbarPreparing

Raised before the toolbar is created.

Type:

Event

Function parameters:

e:

Object

Information about the event.

Object structure:

Name	Type	Description
component	TreeList	The widget's instance.
element	HTMLElement \| jQuery	The widget's container. It is an HTML Element or a jQuery Element when you use jQuery.
model	Object	The model data. Available only if you use Knockout.
toolbarOptions	Toolbar Configuration	The options of the toolbar.

Main article: onToolbarPreparing

React TreeList Events

See Also

adaptiveDetailRowPreparing

See Also

cellClick

See Also

cellHoverChanged

See Also

cellPrepared

See Also

contentReady

See Also

contextMenuPreparing

See Also

dataErrorOccurred

See Also

disposing

See Also

editingStart

See Also

editorPrepared

See Also

editorPreparing

See Also

initialized

See Also

initNewRow

See Also

keyDown

See Also

nodesInitialized

See Also

optionChanged

See Also

rowClick

See Also

rowCollapsed

See Also

rowCollapsing

See Also

rowExpanded

See Also

rowExpanding

See Also

rowInserted

See Also

rowInserting

See Also

rowPrepared

See Also

rowRemoved

See Also

rowRemoving

See Also

rowUpdated

See Also

rowUpdating

See Also

rowValidating

See Also

selectionChanged

See Also

toolbarPreparing

See Also