09e0d3ec81
git-svn-id: http://svn.openlayers.org/trunk/openlayers@5614 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
137 lines
4.1 KiB
JavaScript
137 lines
4.1 KiB
JavaScript
/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
|
|
* license. See http://svn.openlayers.org/trunk/openlayers/license.txt for the
|
|
* full text of the license. */
|
|
|
|
/**
|
|
* @requires OpenLayers/Layer/Vector.js
|
|
* @requires OpenLayers/Ajax.js
|
|
*/
|
|
|
|
/**
|
|
* Class: OpenLayers.Layer.GML
|
|
* Create a vector layer by parsing a GML file. The GML file is
|
|
* passed in as a parameter.
|
|
*
|
|
* Inherits from:
|
|
* - <OpenLayers.Layer.Vector>
|
|
*/
|
|
OpenLayers.Layer.GML = OpenLayers.Class(OpenLayers.Layer.Vector, {
|
|
|
|
/**
|
|
* Property: loaded
|
|
* {Boolean} Flag for whether the GML data has been loaded yet.
|
|
*/
|
|
loaded: false,
|
|
|
|
/**
|
|
* APIProperty: format
|
|
* {<OpenLayers.Format>} The format you want the data to be parsed with.
|
|
*/
|
|
format: null,
|
|
|
|
/**
|
|
* Constructor: OpenLayers.Layer.GML
|
|
* Load and parse a single file on the web, according to the format
|
|
* provided via the 'format' option, defaulting to GML.
|
|
*
|
|
* Parameters:
|
|
* name - {String}
|
|
* url - {String} URL of a GML file.
|
|
* options - {Object} Hashtable of extra options to tag onto the layer.
|
|
*/
|
|
initialize: function(name, url, options) {
|
|
var newArguments = [];
|
|
newArguments.push(name, options);
|
|
OpenLayers.Layer.Vector.prototype.initialize.apply(this, newArguments);
|
|
this.url = url;
|
|
},
|
|
|
|
/**
|
|
* APIMethod: setVisibility
|
|
* Set the visibility flag for the layer and hide/show&redraw accordingly.
|
|
* Fire event unless otherwise specified
|
|
* GML will be loaded if the layer is being made visible for the first
|
|
* time.
|
|
*
|
|
* Parameters:
|
|
* visible - {Boolean} Whether or not to display the layer
|
|
* (if in range)
|
|
* noEvent - {Boolean}
|
|
*/
|
|
setVisibility: function(visibility, noEvent) {
|
|
OpenLayers.Layer.Vector.prototype.setVisibility.apply(this, arguments);
|
|
if(this.visibility && !this.loaded){
|
|
// Load the GML
|
|
this.loadGML();
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Method: moveTo
|
|
* If layer is visible and GML has not been loaded, load GML, then load GML
|
|
* and call OpenLayers.Layer.Vector.moveTo() to redraw at the new location.
|
|
*
|
|
* Parameters:
|
|
* bounds - {Object}
|
|
* zoomChanged - {Object}
|
|
* minor - {Object}
|
|
*/
|
|
moveTo:function(bounds, zoomChanged, minor) {
|
|
OpenLayers.Layer.Vector.prototype.moveTo.apply(this, arguments);
|
|
// Wait until initialisation is complete before loading GML
|
|
// otherwise we can get a race condition where the root HTML DOM is
|
|
// loaded after the GML is paited.
|
|
// See http://trac.openlayers.org/ticket/404
|
|
if(this.visibility && !this.loaded){
|
|
this.events.triggerEvent("loadstart");
|
|
this.loadGML();
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Method: loadGML
|
|
*/
|
|
loadGML: function() {
|
|
if (!this.loaded) {
|
|
var results = OpenLayers.loadURL(this.url, null, this, this.requestSuccess, this.requestFailure);
|
|
this.loaded = true;
|
|
}
|
|
},
|
|
|
|
|
|
/**
|
|
* Method: requestSuccess
|
|
* Process GML after it has been loaded.
|
|
* Called by initialise() and loadUrl() after the GML has been loaded.
|
|
*
|
|
* Parameters:
|
|
* request - {String}
|
|
*/
|
|
requestSuccess:function(request) {
|
|
var doc = request.responseXML;
|
|
|
|
if (!doc || request.fileType!="XML") {
|
|
doc = request.responseText;
|
|
}
|
|
|
|
var gml = this.format ? new this.format() : new OpenLayers.Format.GML();
|
|
this.addFeatures(gml.read(doc));
|
|
this.events.triggerEvent("loadend");
|
|
},
|
|
|
|
/**
|
|
* Method: requestFailure
|
|
* Process a failed loading of GML.
|
|
* Called by initialise() and loadUrl() if there was a problem loading GML.
|
|
*
|
|
* Parameters:
|
|
* request - {String}
|
|
*/
|
|
requestFailure: function(request) {
|
|
alert("Error in loading GML file "+this.url);
|
|
this.events.triggerEvent("loadend");
|
|
},
|
|
|
|
CLASS_NAME: "OpenLayers.Layer.GML"
|
|
});
|