public/lib/OpenLayers/Tile/WFS.js

   1 /* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
   2  * See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
   3  * text of the license. */
   4 // @require: OpenLayers/Tile.js
   5 /**
   6 * @class
   7 */
   8 OpenLayers.Tile.WFS = Class.create();
   9 OpenLayers.Tile.WFS.prototype =
  10   Object.extend( new OpenLayers.Tile(), {
  11
  12     /** @type Array(OpenLayers.Feature)*/
  13     features: null,
  14
  15
  16     /**
  17     * @constructor
  18     *
  19     * @param {OpenLayers.Layer} layer
  20     * @param {OpenLayers.Pixel} position
  21     * @param {OpenLayers.Bounds} bounds
  22     * @param {String} url
  23     * @param {OpenLayers.Size} size
  24     */
  25     initialize: function(layer, position, bounds, url, size) {
  26         OpenLayers.Tile.prototype.initialize.apply(this, arguments);
  27
  28         this.features = new Array();
  29     },
  30
  31     /**
  32      *
  33      */
  34     destroy: function() {
  35         for(var i=0; i < this.features.length; i++) {
  36             this.features[i].destroy();
  37         }
  38         OpenLayers.Tile.prototype.destroy.apply(this, arguments);
  39     },
  40
  41     /**
  42     */
  43     draw:function() {
  44         this.loadFeaturesForRegion(this.requestSuccess);
  45     },
  46
  47
  48     /** get the full request string from the ds and the tile params
  49     *     and call the AJAX loadURL().
  50     *
  51     *     input are function pointers for what to do on success and failure.
  52     *
  53     * @param {function} success
  54     * @param {function} failure
  55     */
  56     loadFeaturesForRegion:function(success, failure) {
  57
  58         if (!this.loaded) {
  59
  60             if (this.url != "") {
  61
  62                 // TODO: Hmmm, this stops multiple loads of the data when a
  63                 //       result isn't immediately retrieved, but it's hacky.
  64                 //       Do it better.
  65                 this.loaded = true;
  66                 OpenLayers.loadURL(this.url, null, this, success, failure);
  67             }
  68         }
  69     },
  70
  71     /** Return from AJAX request
  72     *
  73     * @param {} request
  74     */
  75     requestSuccess:function(request) {
  76         var doc = request.responseXML;
  77
  78         if (!doc || request.fileType!="XML") {
  79             doc = OpenLayers.parseXMLString(request.responseText);
  80         }
  81
  82         var resultFeatures = doc.getElementsByTagName("featureMember");
  83
  84         //clear old featureList
  85         this.features = new Array();
  86
  87         for (var i=0; i < resultFeatures.length; i++) {
  88
  89             var feature = new this.layer.featureClass(this.layer,
  90                                                       resultFeatures[i]);
  91             this.features.append(feature);
  92         }
  93
  94     },
  95
  96     /** @final @type String */
  97     CLASS_NAME: "OpenLayers.Tile.WFS"
  98   }
  99 );
 100