Maps API for JavaScript Developer's Guide

H.map.DataModel

Class Summary

Extends: H.util.OList

The class represents data model of the map. It holds list of layers that are rendered by map's RenderEngine. The class listens to 'update' events from layers and dispatches them to the RenderEngine.

[ For full details, see the Class Details ]

Method Summary

Table 1. Methods
Methods

add (layer, opt_idx)

This method adds layer to the data model, which will result in displaying the layer on the map respecting the order in which they were added.

set (idx, layer) : {H.map.layer.Layer}

removeAt (idx) : {H.map.layer.Layer}

This method removes layer with the given index. This will effectively remove the layer from the map.

remove (layer) : {boolean}

This method removes a given layer. This will effectively remove the layer from the map.

flush ()

This method removes all layers from data model.

indexOf (entry) : {number}

This method retrieves the index of the first object in this list that is identical with the object supplied by the caller.

get (idx) : {?}

To get the entry at the specified index.

getLength () : {number}

This method returns the length of the list.

asArray () : {Array<*>}

This method returns all list's entries as an array.

addEventListener (type, handler, opt_capture, opt_scope)

This method allows to listen for specific event triggered by the object. Keep in mind, that you must removeEventListener manually or dispose an object when you no longer need it. Otherwise memory leak is possible.

removeEventListener (type, handler, opt_capture, opt_scope)

This method will removed previously added listener from the event target

dispatchEvent (evt)

This method will dispatch event on the event target object

dispose ()

Removes listeners from this object. Classes that extend EventTarget may need to override this method in order to remove references to DOM Elements and additional listeners.

addOnDisposeCallback (callback, opt_scope)

This method adds callback which is triggered when the object is being disposed

Events Summary

Table 2. Events
Events

add : {H.util.OList.Event}

Fired when an entry was added to the list.

remove : {H.util.OList.Event}

Fired when an entry was removed from the list.

set : {H.util.OList.Event}

Fired when an entry was set in the list.

move : {H.util.OList.Event}

Fired when an entry was moved within the list.

Class Description

The class represents data model of the map. It holds list of layers that are rendered by map's RenderEngine. The class listens to 'update' events from layers and dispatches them to the RenderEngine.

Constructor Details

H.map.DataModel(opt_layers)

Parameters:
 
opt_layers:
{Array=} [optional]
 
array of layers to be added to the data model

Method Details

add (layer, opt_idx)

This method adds layer to the data model, which will result in displaying the layer on the map respecting the order in which they were added.

Parameters:
 
layer:
{H.map.layer.Layer}
 
The Layer to add
opt_idx:
{number=} [optional]
 
index where the new element should be inserted

set (idx, layer) : {H.map.layer.Layer}

Parameters:
 
idx:
{number}
 
layer:
{H.map.layer.Layer}
 
Returns:
 
{H.map.layer.Layer}

removeAt (idx) : {H.map.layer.Layer}

This method removes layer with the given index. This will effectively remove the layer from the map.

Parameters:
 
idx:
{number}
 
index of the layer to be removed
Returns:
 
{H.map.layer.Layer}

remove (layer) : {boolean}

This method removes a given layer. This will effectively remove the layer from the map.

Parameters:
 
layer:
{H.map.layer.Layer}
 
The layer to be removed
Returns:
 
{boolean}
signals if the layer could be found in the list and is removed

flush ()

This method removes all layers from data model.

indexOf (entry) : {number}

This method retrieves the index of the first object in this list that is identical with the object supplied by the caller.

Parameters:
 
entry:
{?}
 
The entry for which to return the index.
Returns:
 
{number}
The index of the first matching entry in this list or -1 if the entry provided by the caller is not found in the list

get (idx) : {?}

To get the entry at the specified index.

Parameters:
 
idx:
{number}
 
The index of the entry to get a negative index is treated as being relative from the end of the list
Returns:
 
{?}
The element at the given index

getLength () : {number}

This method returns the length of the list.

Returns:
 
{number}

asArray () : {Array<*>}

This method returns all list's entries as an array.

Returns:
 
{Array<*>}
The list as an array

addEventListener (type, handler, opt_capture, opt_scope)

This method allows to listen for specific event triggered by the object. Keep in mind, that you must removeEventListener manually or dispose an object when you no longer need it. Otherwise memory leak is possible.

Parameters:
 
type:
{string}
 
name of event
handler:
{!Function}
 
event handler function
opt_capture:
{boolean=} [optional]
 
if set to true will listen in the capture phase (bubble otherwise)
opt_scope:
{Object=} [optional]
 
scope for the handler function

removeEventListener (type, handler, opt_capture, opt_scope)

This method will removed previously added listener from the event target

Parameters:
 
type:
{string}
 
name of event
handler:
{!Function}
 
previously added event handler
opt_capture:
{boolean=} [optional]
 
if set to true will listen in the capture phase (bubble otherwise)
opt_scope:
{Object=} [optional]
 
scope for the handler function

dispatchEvent (evt)

This method will dispatch event on the event target object

Parameters:
 
evt:
{(H.util.Event | string)}
 
event object or event name

dispose ()

Removes listeners from this object. Classes that extend EventTarget may need to override this method in order to remove references to DOM Elements and additional listeners.

addOnDisposeCallback (callback, opt_scope)

This method adds callback which is triggered when the object is being disposed

Parameters:
 
callback:
{!Function}
 
The callback function.
opt_scope:
{Object=} [optional]
 
An optional scope to call the callback in.

Event Details

add: {H.util.OList.Event}

Fired when an entry was added to the list.

remove: {H.util.OList.Event}

Fired when an entry was removed from the list.

set: {H.util.OList.Event}

Fired when an entry was set in the list.

move: {H.util.OList.Event}

Fired when an entry was moved within the list.

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