OpenLayers.Layer.HTTPRequest

Inherits from

OpenLayers.Layer

Summary

OpenLayers.Layer.HTTPRequest
Constants
URL_HASH_FACTOR	{Float} Used to hash URL param strings for multi-WMS server selection.
Properties
url	{Array(String) or String} This is either an array of url strings or a single url string.
params	{Object} Hashtable of key/value parameters
reproject	Deprecated.
Constructor
OpenLayers.Layer.HTTPRequest
Functions
destroy
clone
setUrl
mergeNewParams
redraw	Redraws the layer.
selectUrl	selectUrl() implements the standard floating-point multiplicative hash function described by Knuth, and hashes the contents of the given param string into a float between 0 and 1.
getFullRequestString	Combine url with layer’s params and these newParams.

Constants

URL_HASH_FACTOR

{Float} Used to hash URL param strings for multi-WMS server selection. Set to the Golden Ratio per Knuth’s recommendation.

Properties

url

{Array(String) or String} This is either an array of url strings or a single url string.

params

{Object} Hashtable of key/value parameters

reproject

Deprecated. See http://trac.openlayers.org/wiki/SpatialMercator for information on the replacement for this functionality. {Boolean} Whether layer should reproject itself based on base layer locations. This allows reprojection onto commercial layers. Default is false: Most layers can’t reproject, but layers which can create non-square geographic pixels can, like WMS.

Constructor

OpenLayers.Layer.HTTPRequest

Parameters

name	{String}
url	{Array(String) or String}
params	{Object}
options	{Object} Hashtable of extra options to tag onto the layer

Functions

destroy

destroy: function()

clone

clone: function ( obj )

Parameters

obj

{Object}

Returns

{OpenLayers.Layer.HTTPRequest} An exact clone of this OpenLayers.Layer.HTTPRequest

setUrl

setUrl: function( newUrl )

Parameters

newUrl

{String}

mergeNewParams

mergeNewParams:function( newParams )

Parameters

newParams

{Object}

Returns

redrawn: {Boolean} whether the layer was actually redrawn.

redraw

redraw: function( force )

Redraws the layer. Returns true if the layer was redrawn, false if not.

Parameters

force

{Boolean} Force redraw by adding random parameter.

Returns

{Boolean} The layer was redrawn.

selectUrl

selectUrl: function( paramString,
urls )

selectUrl() implements the standard floating-point multiplicative hash function described by Knuth, and hashes the contents of the given param string into a float between 0 and 1. This float is then scaled to the size of the provided urls array, and used to select a URL.

Parameters

paramString	{String}
urls	{Array(String)}

Returns

{String} An entry from the urls array, deterministically selected based on the paramString.

getFullRequestString

getFullRequestString:function( newParams,
altUrl )

Combine url with layer’s params and these newParams.

does checking on the serverPath variable, allowing for cases when it is supplied with trailing ? or &, as well as cases where not.

return in formatted string like this

”server?key1=value1&key2=value2&key3=value3”

WARNING: The altUrl parameter is deprecated and will be removed in 3.0.

Parameters

newParams	{Object}
altUrl	{String} Use this as the url instead of the layer’s url

Returns

{String}