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Methods

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

beginUpdate()

Prevents the widget from refreshing until the endUpdate() method is called.

The beginUpdate() and endUpdate() methods prevent the widget from excessive updates when you are changing multiple widget settings at once. After the beginUpdate() method is called, the widget does not update its UI until the endUpdate() method is called.

See Also

clearSelection()

Deselects all nodes in the widget.

To deselect a particular node, call its select(state) method.

dispose()

Disposes of all the resources allocated to the TreeMap instance.

The following code disposes of an TreeMap instance that corresponds to the element ID (or reference variable in Angular) and removes the element from the DOM:

jQuery
JavaScript
$("#myTreeMap").dxTreeMap("dispose");
$("#myTreeMap").remove();
Angular
HTML
<dx-tree-map #treeMapVar id="myTreeMap"></dx-tree-map>
TypeScript
import { ..., ViewChild } from "@angular/core";
import { DxTreeMapComponent } from "devextreme-angular";
// ...
export class AppComponent {
    @ViewChild("treeMapVar") treeMap: DxTreeMapComponent;

    removeTreeMap (e) {
        this.treeMap.instance.dispose();
        document.getElementById("myTreeMap").remove();
    }
}

drillUp()

Drills one level up.

To learn how to implement the drill down functionality, see the drillDown() method description.

element()

Gets the root widget element.

Return Value:

Element (jQuery or HTML)

An HTML element or a jQuery element when you use jQuery.

See Also

endUpdate()

Refreshes the widget after a call of the beginUpdate() method.

Main article: beginUpdate()

See Also

exportTo(fileName, format)

Exports the widget.

Parameters:
fileName:

String

The name of the file to which the widget is about to be exported.

format:

String

The file's format. One of 'PNG', 'PDF', 'JPEG', 'SVG' and 'GIF'.
PNG is used if the browser does not support exporting to the specified format.

NOTE
Safari on Mac OS does not implement an API for saving files, but you can set up a server-side proxy.

View Demo

See Also

getCurrentNode()

Gets the current node.

Return Value:

TreeMap Node

The Node object.

NOTE
If the drill down feature is not implemented, this method returns the root node.
See Also

getDataSource()

Gets the DataSource instance.

Return Value:

DataSource

The DataSource instance.

NOTE
This method returns the DataSource instance even if the widget's dataSource option was given a simple array.
See Also

getInstance(element)

Gets the instance of a widget found using its DOM node.

Parameters:
element:

DOM Node

|

jQuery

The widget's container.

Return Value:

Object

The widget's instance.

getInstance is a static method that the widget class supports. The following code demonstrates how to get the TreeMap instance found in an element with the myTreeMap ID:

// Modular approach
import TreeMap from "devextreme/viz/tree_map";
...
let element = document.getElementById("myTreeMap");
let instance = TreeMap.getInstance(element) as TreeMap;

// Non-modular approach
let element = document.getElementById("myTreeMap");
let instance = DevExpress.viz.dxTreeMap.getInstance(element);
See Also

getRootNode()

Gets the root node.

Return Value:

TreeMap Node

The root node; described in the Node section.

See Also

getSize()

Gets the current widget size.

Return Value:

Size

The current widget size.

Returns an object with the following fields.

  • width
    The width of the widget in pixels.
  • height
    The height of the widget in pixels.
See Also

hideLoadingIndicator()

Hides the loading indicator.

Although the loading indicator hides automatically once the widget is ready, you can hide it from code at the required moment using this method.

See Also

hideTooltip()

Hides the tooltip.

Use this and showTooltip() methods to change the visibility of the tooltip programmatically.

See Also

instance()

Gets the widget's instance. Use it to access other methods of the widget.

Return Value:

TreeMap

This widget's instance.

See Also

off(eventName)

Detaches all event handlers from a single event.

Parameters:
eventName:

String

The event's name.

Return Value:

TreeMap

The object for which this method is called.

See Also

off(eventName, eventHandler)

Detaches a particular event handler from a single event.

Parameters:
eventName:

String

The event's name.

eventHandler:

Function

The event's handler.

Return Value:

TreeMap

The object for which this method is called.

See Also

on(eventName, eventHandler)

Subscribes to an event.

Parameters:
eventName:

String

The event's name.

eventHandler:

Function

The event's handler.

Return Value:

TreeMap

The object for which this method is called.

Use this method to subscribe to one of the events listed in the Events section.

See Also

on(events)

Subscribes to events.

Parameters:
events:

Object

Events with their handlers: { "eventName1": handler1, "eventName2": handler2, ...}

Return Value:

TreeMap

The object for which this method is called.

Use this method to subscribe to several events with one method call. Available events are listed in the Events section.

See Also

option()

Gets all widget options.

Return Value:

Object

The widget's options.

See Also

option(optionName)

Gets the value of a single option.

Parameters:
optionName:

String

The option's name or full path.

Return Value: any

This option's value.

See Also

option(optionName, optionValue)

Updates the value of a single option.

Parameters:
optionName:

String

The option's name or full path.

optionValue: any

This option's new value.

See Also

option(options)

Updates the values of several options.

Parameters:
options:

Object

Options with their new values.

See Also

print()

Opens the browser's print window.

View Demo

See Also

render()

Redraws the widget.

Normally, the widget redraws itself automatically after the browser window is resized. But on rare occasions, you may need to request the redrawing, for example, after the widget's container is resized. For this purpose, call the render() method.

See Also

resetDrillDown()

Resets the drill down level.

Calling this method makes the root level the current one. If you need to drill one level up or down, use the drillUp() method of the widget or the drillDown() method of a node.

See Also

showLoadingIndicator()

Shows the loading indicator.

See Also

svg()

Gets the widget's SVG markup.

Return Value:

String

The widget's SVG markup.

See Also