ALKMaps.Format.KML

Read/Write KML. Create a new instance with the ALKMaps.Format.KML constructor.

Inherits from

ALKMaps.Format.XML

Summary

ALKMaps.Format.KML	Read/Write KML.
Properties
namespaces	{Object} Mapping of namespace aliases to namespace URIs.
kmlns	{String} KML Namespace to use.
placemarksDesc	{String} Name of the placemarks.
foldersName	{String} Name of the folders.
foldersDesc	{String} Description of the folders.
extractAttributes	{Boolean} Extract attributes from KML.
kvpAttributes	{Boolean} Only used if extractAttributes is true.
extractStyles	{Boolean} Extract styles from KML.
extractTracks	{Boolean} Extract gx:Track elements from Placemark elements.
trackAttributes	{Array} If extractTracks is true, points within gx:Track elements will be parsed as features with when, heading, tilt, and roll attributes.
internalns	{String} KML Namespace to use -- defaults to the namespace of the Placemark node being parsed, but falls back to kmlns.
features	{Array} Array of features
styles	{Object} Storage of style objects
styleBaseUrl	{String}
fetched	{Object} Storage of KML URLs that have been fetched before in order to prevent reloading them.
maxDepth	{Integer} Maximum depth for recursive loading external KML URLs Defaults to 0: do no external fetching
Constructor
ALKMaps.Format.KML	Create a new parser for KML.
Functions and Properties
read	Read data from a string, and return a list of features.
parseData	Read data from a string, and return a list of features.
parseLinks	Finds URLs of linked KML documents and fetches them
fetchLink	Fetches a URL and returns the result
parseStyles	Looks for Style nodes in the data and parses them Also parses StyleMap nodes, but only uses the ‘normal’ key
parseKmlColor	Parses a kml color (in ‘aabbggrr’ format) and returns the corresponding color and opacity or null if the color is invalid.
parseStyle	Parses the children of a Style node and builds the style hash accordingly
parseStyleMaps	Looks for Style nodes in the data and parses them Also parses StyleMap nodes, but only uses the ‘normal’ key
parseFeatures	Loop through all Placemark nodes and parse them.
readers	Contains public functions, grouped by namespace prefix, that will be applied when a namespaced node is found matching the function name.
parseFeature	This function is the core of the KML parsing code in ALKMaps.
getStyle	Retrieves a style from a style hash using styleUrl as the key If the styleUrl doesn’t exist yet, we try to fetch it Internet
parseGeometry	Properties of this object are the functions that parse geometries based on their type.
parseGeometry.point	Given a KML node representing a point geometry, create an ALKMaps point geometry.
parseGeometry.linestring	Given a KML node representing a linestring geometry, create an ALKMaps linestring geometry.
parseGeometry.polygon	Given a KML node representing a polygon geometry, create an ALKMaps polygon geometry.
parseGeometry.multigeometry	Given a KML node representing a multigeometry, create an ALKMaps geometry collection.
parseAttributes
parseExtendedData	Parse ExtendedData from KML.
parseProperty	Convenience method to find a node and return its value
write	Accept Feature Collection, and return a string.
createFolderXML	Creates and returns a KML folder node
createPlacemarkXML	Creates and returns a KML placemark node representing the given feature.
buildGeometryNode	Builds and returns a KML geometry node with the given geometry.
buildGeometry	Object containing methods to do the actual geometry node building based on geometry type.
buildGeometry.point	Given an ALKMaps point geometry, create a KML point.
buildGeometry.multipoint	Given an ALKMaps multipoint geometry, create a KML GeometryCollection.
buildGeometry.linestring	Given an ALKMaps linestring geometry, create a KML linestring.
buildGeometry.multilinestring	Given an ALKMaps multilinestring geometry, create a KML GeometryCollection.
buildGeometry.linearring	Given an ALKMaps linearring geometry, create a KML linearring.
buildGeometry.polygon	Given an ALKMaps polygon geometry, create a KML polygon.
buildGeometry.multipolygon	Given an ALKMaps multipolygon geometry, create a KML GeometryCollection.
buildGeometry.collection	Given an ALKMaps geometry collection, create a KML MultiGeometry.
buildCoordinatesNode	Builds and returns the KML coordinates node with the given geometry <coordinates>...</coordinates>
buildCoordinates
buildExtendedData

Properties

namespaces

{Object} Mapping of namespace aliases to namespace URIs.

kmlns

{String} KML Namespace to use. Defaults to 2.0 namespace.

placemarksDesc

{String} Name of the placemarks. Default is “No description available”.

foldersName

{String} Name of the folders. Default is “ALKMaps export”. If set to null, no name element will be created.

foldersDesc

{String} Description of the folders. Default is “Exported on [date].” If set to null, no description element will be created.

extractAttributes

{Boolean} Extract attributes from KML. Default is true. Extracting styleUrls requires this to be set to true Note that currently only Data and SimpleData elements are handled.

kvpAttributes

{Boolean} Only used if extractAttributes is true. If set to true, attributes will be simple key-value pairs, compatible with other formats, Any displayName elements will be ignored. If set to false, attributes will be objects, retaining any displayName elements, but not compatible with other formats. Any CDATA in displayName will be read in as a string value. Default is false.

extractStyles

{Boolean} Extract styles from KML. Default is false. Extracting styleUrls also requires extractAttributes to be set to true

extractTracks

{Boolean} Extract gx:Track elements from Placemark elements. Default is false. If true, features will be generated for all points in all gx:Track elements. Features will have a when (Date) attribute based on when elements in the track. If tracks include angle elements, features will have heading, tilt, and roll attributes. If track point coordinates have three values, features will have an altitude attribute with the third coordinate value.

trackAttributes

{Array} If extractTracks is true, points within gx:Track elements will be parsed as features with when, heading, tilt, and roll attributes. Any additional attribute names can be provided in trackAttributes.

internalns

{String} KML Namespace to use -- defaults to the namespace of the Placemark node being parsed, but falls back to kmlns.

features

{Array} Array of features

styles

{Object} Storage of style objects

styleBaseUrl

{String}

fetched

{Object} Storage of KML URLs that have been fetched before in order to prevent reloading them.

maxDepth

{Integer} Maximum depth for recursive loading external KML URLs Defaults to 0: do no external fetching

Constructor

ALKMaps.Format.KML

Create a new parser for KML.

Parameters

options

{Object} An optional object whose properties will be set on this instance.

Functions and Properties

read

read: function( data )

Read data from a string, and return a list of features.

Parameters

data	{String} or {DOMElement} data to read/parse.

Returns

{Array(ALKMaps.Feature.Vector)} List of features.

parseData

parseData: function( data,
options )

Read data from a string, and return a list of features.

Parameters

data	{String} or {DOMElement} data to read/parse.
options	{Object} Hash of options

Returns

{Array(ALKMaps.Feature.Vector)} List of features.

parseLinks

parseLinks: function( nodes,
options )

Finds URLs of linked KML documents and fetches them

Parameters

nodes	{Array} of {DOMElement} data to read/parse.
options	{Object} Hash of options

fetchLink

fetchLink: function( href )

Fetches a URL and returns the result

Parameters

href	{String} url to be fetched

parseStyles

parseStyles: function( nodes,
options )

Looks for Style nodes in the data and parses them Also parses StyleMap nodes, but only uses the ‘normal’ key

Parameters

nodes	{Array} of {DOMElement} data to read/parse.
options	{Object} Hash of options

parseKmlColor

parseKmlColor: function( kmlColor )

Parses a kml color (in ‘aabbggrr’ format) and returns the corresponding color and opacity or null if the color is invalid.

Parameters

kmlColor

{String} a kml formatted color

Returns

{Object}

parseStyle

parseStyle: function( node )

Parses the children of a Style node and builds the style hash accordingly

Parameters

node	{DOMElement} Style node

parseStyleMaps

parseStyleMaps: function( nodes,
options )

Looks for Style nodes in the data and parses them Also parses StyleMap nodes, but only uses the ‘normal’ key

Parameters

nodes	{Array} of {DOMElement} data to read/parse.
options	{Object} Hash of options

parseFeatures

parseFeatures: function( nodes,
options )

Loop through all Placemark nodes and parse them. Will create a list of features

Parameters

nodes	{Array} of {DOMElement} data to read/parse.
options	{Object} Hash of options

readers

Contains public functions, grouped by namespace prefix, that will be applied when a namespaced node is found matching the function name. The function will be applied in the scope of this parser with two arguments: the node being read and a context object passed from the parent.

parseFeature

parseFeature: function( node )

This function is the core of the KML parsing code in ALKMaps. It creates the geometries that are then attached to the returned feature, and calls parseAttributes() to get attribute data out.

Parameters

node	{DOMElement}

Returns

{ALKMaps.Feature.Vector} A vector feature.

getStyle

getStyle: function( styleUrl,
options )

Retrieves a style from a style hash using styleUrl as the key If the styleUrl doesn’t exist yet, we try to fetch it Internet

Parameters

styleUrl	{String} URL of style
options	{Object} Hash of options

Returns

{Object}

node	{DOMElement} A KML MultiGeometry node.

Returns

{ALKMaps.Geometry.Collection} A geometry collection.

parseAttributes

parseAttributes: function( node )

Parameters

node	{DOMElement}

Returns

{Object} An attributes object.

parseExtendedData

parseExtendedData: function( node )

Parse ExtendedData from KML. Limited support for schemas/datatypes. See https://developers.google.com/kml/documentation/kmlreference?csw=1#extendeddata for more information on extendeddata.

parseProperty

parseProperty: function( xmlNode,
namespace,
tagName )

Convenience method to find a node and return its value

Parameters

xmlNode	{<DOMElement>}
namespace	{String} namespace of the node to find
tagName	{String} name of the property to parse

Returns

{String} The value for the requested property (defaults to null)

write

write: function( features )

Accept Feature Collection, and return a string.

Parameters

features

{Array(ALKMaps.Feature.Vector)} An array of features.

Returns

{String} A KML string.

createFolderXML

createFolderXML: function()

Creates and returns a KML folder node

Returns

{DOMElement}

createPlacemarkXML

createPlacemarkXML: function( feature )

Creates and returns a KML placemark node representing the given feature.

Parameters

feature

{ALKMaps.Feature.Vector}

Returns

{DOMElement}

buildGeometryNode

buildGeometryNode: function( geometry )

Builds and returns a KML geometry node with the given geometry.

Parameters

geometry

{ALKMaps.Geometry}

geometry

{ALKMaps.Geometry.Collection} A geometry collection.

Returns

{DOMElement} A KML MultiGeometry node.

buildCoordinatesNode

buildCoordinatesNode: function( geometry )

Builds and returns the KML coordinates node with the given geometry <coordinates>...</coordinates>

Parameters

geometry

{ALKMaps.Geometry}

Returns

{DOMElement}

buildCoordinates

buildCoordinates: function( point )

Parameters

point

{ALKMaps.Geometry.Point}

Returns {String} a coordinate pair

buildExtendedData

buildExtendedData: function( attributes )

Parameters

attributes

{Object}

Returns {DOMElement} A KML ExtendedData node or {null} if no attributes.