Angular TreeMap API

The TreeMap is a UI component that displays hierarchical data by using nested rectangles.

import { DxTreeMapModule } from "devextreme-angular"
Selector: dx-tree-map

In the TreeMap UI component, hierarchical data is represented by a set of nested rectangles whose sizes are proportional to the visualized values. TreeMap operates with plain and hierarchical data sources. Also, it can visualize a hierarchy reconstructed from a flat data source.

TreeMap provides three layout algorithms out-of-the-box along with the capability to implement your own algorithm. In addition, the UI component includes API methods that enable you to implement the drill down feature. Moreover, TreeMap supports all interactive features available in other DevExtreme Data Visualization Widgets: click, hover and selection.

View Demo

See Also

Properties

This section describes properties that configure the contents, behavior and appearance of the TreeMap UI component.

Name Description
childrenField

Specifies the name of the data source field that provides nested items for a group. Applies to hierarchical data sources only.
colorField

Specifies the name of the data source field that provides colors for tiles.
colorizer

Manages the color settings.
dataSource

Binds the UI component to data.
disabled

Specifies whether the UI component responds to user interaction.
elementAttr

Specifies the global attributes to be attached to the UI component's container element.
export

Configures the exporting and printing features.
group

Configures groups.
hoverEnabled

Specifies whether tiles and groups change their style when a user pauses on them.
idField

Specifies the name of the data source field that provides IDs for items. Applies to plain data sources only.
interactWithGroup

Specifies whether the user will interact with a single tile or its group.
labelField

Specifies the name of the data source field that provides texts for tile and group labels.
layoutAlgorithm

Specifies the layout algorithm.
layoutDirection

Specifies the direction in which the items will be laid out.
loadingIndicator

Configures the loading indicator.
maxDepth

Specifies how many hierarchical levels must be visualized.
onClick

A function that is executed when a node is clicked or tapped.
onDisposing

A function that is executed before the UI component is disposed of.
onDrawn

A function that is executed when the UI component's rendering has finished.
onDrill

A function that is executed when a user drills up or down.
onExported

A function that is executed after the UI component is exported.
onExporting

A function that is executed before the UI component is exported.
onFileSaving

A function that is executed before a file with exported UI component is saved to the user's local storage.
onHoverChanged

A function that is executed after the pointer enters or leaves a node.
onIncidentOccurred

A function that is executed when an error or warning occurs.
onInitialized

A function used in JavaScript frameworks to save the UI component instance.
onNodesInitialized

A function that is executed only once, after the nodes are initialized.
onNodesRendering

A function that is executed before the nodes are displayed and each time the collection of active nodes is changed.
onOptionChanged

A function that is executed after a UI component property is changed.
onSelectionChanged

A function that is executed when a node is selected or selection is canceled.
parentField

Specifies the name of the data source field that provides parent IDs for items. Applies to plain data sources only.
pathModified

Notifies the UI component that it is embedded into an HTML page that uses a tag modifying the path.
redrawOnResize

Specifies whether to redraw the UI component when the size of the parent browser window changes or a mobile device rotates.
rtlEnabled

Switches the UI component to a right-to-left representation.
selectionMode

Specifies whether a single or multiple nodes can be in the selected state simultaneously.
size

Specifies the UI component's size in pixels.
theme

Sets the name of the theme the UI component uses.
tile

Configures tiles.
title

Configures the UI component's title.
tooltip

Configures tooltips - small pop-up rectangles that display information about a data-visualizing UI component element being pressed or hovered over with the mouse pointer.
valueField

Specifies the name of the data source field that provides values for tiles.

See Also

Methods

This section describes methods that can be called to manipulate the TreeMap UI component.

Name Description
beginUpdate()

Prevents the UI component from refreshing until the endUpdate() method is called.
clearSelection()

Deselects all nodes in the UI component.
dispose()

Disposes of all the resources allocated to the TreeMap instance.
drillUp()

Drills one level up.
element()

Gets the root UI component element.
endUpdate()

Refreshes the UI component after a call of the beginUpdate() method.
exportTo(fileName, format)

Exports the UI component.
getCurrentNode()

Gets the current node.
getDataSource()

Gets the DataSource instance.
getInstance(element)

Gets the instance of a UI component found using its DOM node.
getRootNode()

Gets the root node.
getSize()

Gets the current UI component size.
hideLoadingIndicator()

Hides the loading indicator.
hideTooltip()

Hides the tooltip.
instance()

Gets the UI component's instance. Use it to access other methods of the UI component.
off(eventName)

Detaches all event handlers from a single event.
off(eventName, eventHandler)

Detaches a particular event handler from a single event.
on(eventName, eventHandler)

Subscribes to an event.
on(events)

Subscribes to events.
option()

Gets all UI component properties.
option(optionName)

Gets the value of a single property.
option(optionName, optionValue)

Updates the value of a single property.
option(options)

Updates the values of several properties.
print()

Opens the browser's print window.
render()

Redraws the UI component.
resetDrillDown()

Resets the drill down level.
resetOption(optionName)

Resets a property to its default value.
showLoadingIndicator()

Shows the loading indicator.
svg()

Gets the UI component's SVG markup.

See Also

Events

This section describes events fired by this UI component.

Name Description
click

Raised when a node is clicked or tapped.
disposing

Raised before the UI component is disposed of.
drawn

Raised when the UI component's rendering has finished.
drill

Raised when a user drills up or down.
exported

Raised after the UI component is exported.
exporting

Raised before the UI component is exported.
fileSaving

Raised before a file with exported UI component is saved to the user's local storage.
hoverChanged

Raised after the pointer enters or leaves a node.
incidentOccurred

Raised when an error or warning occurs.
initialized

Raised only once, after the UI component is initialized.
nodesInitialized

Raised only once, after the nodes are initialized.
nodesRendering

Raised before the nodes are displayed and each time the collection of active nodes is changed.
optionChanged

Raised after a UI component property is changed.
selectionChanged

Raised when a node is selected or selection is canceled.

See Also

Node

This section describes the Node object, which represents a treemap node.

import { DxTreeMapTypes } from "devextreme-angular/ui/tree-map"

Node objects are accessible within certain event handlers, for example, onNodesInitialized, onNodesRendering, etc. Also, you can obtain these objects using the getRootNode() and getCurrentNode() methods.