919af2ff90
conflicts later on. git-svn-id: http://svn.openlayers.org/trunk/openlayers@2920 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
114 lines
3.6 KiB
JavaScript
114 lines
3.6 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/repository-license.txt
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* for the full text of the license. */
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/**
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* Create a vector layer by parsing a GML file. The GML file is
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* passed in as a parameter.
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* @class
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*
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* @requires OpenLayers/Layer/Vector.js
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* @requires OpenLayers/Ajax.js
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*/
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OpenLayers.Layer.GML = OpenLayers.Class.create();
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OpenLayers.Layer.GML.prototype =
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OpenLayers.Class.inherit( OpenLayers.Layer.Vector, {
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/**
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* Flag for whether the GML data has been loaded yet.
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* @type Boolean
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*/
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loaded: false,
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format: null,
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/**
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* @constructor
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*
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* @param {String} name
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* @param {String} url URL of a GML file.
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* @param {Object} options Hashtable of extra options to tag onto the layer.
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* Options renderer {Object}: Typically SvgRenderer or VmlRenderer.
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*/
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initialize: function(name, url, options) {
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var newArguments = new Array()
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newArguments.push(name, options);
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OpenLayers.Layer.Vector.prototype.initialize.apply(this, newArguments);
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this.url = url;
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},
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/**
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* Set the visibility flag for the layer and hide/show&redraw accordingly.
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* Fire event unless otherwise specified
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* GML will be loaded if the layer is being made visible for the first
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* time.
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*
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* @param {Boolean} visible Whether or not to display the layer
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* (if in range)
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* @param {Boolean} noEvent
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*/
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setVisibility: function(visibility, noEvent) {
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OpenLayers.Layer.Vector.prototype.setVisibility.apply(this, arguments);
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if(this.visibility && !this.loaded){
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// Load the GML
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this.loadGML();
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}
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},
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/**
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* If layer is visible and GML has not been loaded, load GML, then load GML
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* and call OpenLayers.Layer.Vector.moveTo() to redraw at the new location.
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* @param {Object} bounds
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* @param {Object} zoomChanged
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* @param {Object} minor
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*/
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moveTo:function(bounds, zoomChanged, minor) {
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OpenLayers.Layer.Vector.prototype.moveTo.apply(this, arguments);
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// Wait until initialisation is complete before loading GML
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// otherwise we can get a race condition where the root HTML DOM is
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// loaded after the GML is paited.
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// See http://trac.openlayers.org/ticket/404
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if(this.visibility && !this.loaded){
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this.loadGML();
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}
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},
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loadGML: function() {
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if (!this.loaded) {
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var results = OpenLayers.loadURL(this.url, null, this, this.requestSuccess, this.requestFailure);
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this.loaded = true;
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}
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},
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/**
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* Process GML after it has been loaded.
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* Called by initialise() and loadUrl() after the GML has been loaded.
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* @private
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* @param {String} request
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*/
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requestSuccess:function(request) {
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var doc = request.responseXML;
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if (!doc || request.fileType!="XML") {
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doc = request.responseText;
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}
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var gml = this.format ? new this.format() : new OpenLayers.Format.GML();
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this.addFeatures(gml.read(doc));
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},
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/**
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* Process a failed loading of GML.
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* Called by initialise() and loadUrl() if there was a problem loading GML.
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* @private
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* @param {String} request
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*/
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requestFailure: function(request) {
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alert("Error in loading GML file "+this.url);
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Layer.GML"
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});
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