/* Copyright (c) 2006-2007 MetaCarta, Inc., published under the BSD license. * See http://svn.openlayers.org/trunk/openlayers/release-license.txt  * for the full text of the license. *//** * @requires OpenLayers/Layer/Markers.js * @requires OpenLayers/Ajax.js * * Class: OpenLayers.Layer.Text * Tab seperated values file parsing code which creates a markers layer.   * * Inherits from; *  - <OpenLayers.Layer.Markers> */OpenLayers.Layer.Text = OpenLayers.Class(OpenLayers.Layer.Markers, {    /**     * APIProperty: location      * {String} store url of text file - this should be specified in the      *   "options" hashtable. Can not be changed once passed in.      */    location:null,    /**      * Property: features     * Array({<OpenLayers.Feature>})      */    features: null,    /**      * Property: selectedFeature     * {<OpenLayers.Feature>}     */    selectedFeature: null,    /**    * Constructor: OpenLayers.Layer.Text    * Create a text layer.    *     * Parameters:    * name - {String}     * options - {Object} Hashtable of extra options to tag onto    *                    the layer. Must include "location" property.    */    initialize: function(name, options) {        OpenLayers.Layer.Markers.prototype.initialize.apply(this, arguments);        this.features = new Array();        if (this.location != null) {            var onFail = function(e) {                this.events.triggerEvent("loadend");            };            this.events.triggerEvent("loadstart");            OpenLayers.loadURL(this.location, null,                                this, this.parseData, onFail);        }    },   /**     * APIMethod: destroy      */    destroy: function() {        this.clearFeatures();        this.features = null;        OpenLayers.Layer.Markers.prototype.destroy.apply(this, arguments);    },            /**     * Method: parseData     *     * Parameters:     * ajaxRequest - {XMLHttpRequest}      */    parseData: function(ajaxRequest) {        var text = ajaxRequest.responseText;        var lines = text.split('\n');        var columns;        // length - 1 to allow for trailing new line        for (var lcv = 0; lcv < (lines.length - 1); lcv++) {            var currLine = lines[lcv].replace(/^\s*/,'').replace(/\s*$/,'');                    if (currLine.charAt(0) != '#') { /* not a comment */                            if (!columns) {                    //First line is columns                    columns = currLine.split('\t');                } else {                    var vals = currLine.split('\t');                    var location = new OpenLayers.LonLat(0,0);                    var title; var url;                    var icon, iconSize, iconOffset, overflow;                    var set = false;                    for (var valIndex = 0; valIndex < vals.length; valIndex++) {                        if (vals[valIndex]) {                            if (columns[valIndex] == 'point') {                                var coords = vals[valIndex].split(',');                                location.lat = parseFloat(coords[0]);                                location.lon = parseFloat(coords[1]);                                set = true;                            } else if (columns[valIndex] == 'lat') {                                location.lat = parseFloat(vals[valIndex]);                                set = true;                            } else if (columns[valIndex] == 'lon') {                                location.lon = parseFloat(vals[valIndex]);                                set = true;                            } else if (columns[valIndex] == 'title')                                title = vals[valIndex];                            else if (columns[valIndex] == 'image' ||                                     columns[valIndex] == 'icon')                                url = vals[valIndex];                            else if (columns[valIndex] == 'iconSize') {                                var size = vals[valIndex].split(',');                                iconSize = new OpenLayers.Size(parseFloat(size[0]),                                                           parseFloat(size[1]));                            } else if (columns[valIndex] == 'iconOffset') {                                var offset = vals[valIndex].split(',');                                iconOffset = new OpenLayers.Pixel(parseFloat(offset[0]),                                                           parseFloat(offset[1]));                            } else if (columns[valIndex] == 'title') {                                title = vals[valIndex];                            } else if (columns[valIndex] == 'description') {                                description = vals[valIndex];                            } else if (columns[valIndex] == 'overflow') {                                overflow = vals[valIndex];                            }                            }                    }                    if (set) {                      var data = {};                      if (url != null) {                          data.icon = new OpenLayers.Icon(url,                                                           iconSize,                                                           iconOffset);                      } else {                          data.icon = OpenLayers.Marker.defaultIcon();                          //allows for the case where the image url is not                           // specified but the size is. use a default icon                          // but change the size                          if (iconSize != null) {                              data.icon.setSize(iconSize);                          }                                              }                      if ((title != null) && (description != null)) {                          data['popupContentHTML'] = '<h2>'+title+'</h2><p>'+description+'</p>';                      }                                            data['overflow'] = overflow || "auto";                                             var feature = new OpenLayers.Feature(this, location, data);                      this.features.push(feature);                      var marker = feature.createMarker();                      if ((title != null) && (description != null)) {                        marker.events.register('click', feature, this.markerClick);                      }                      this.addMarker(marker);                    }                }            }        }        this.events.triggerEvent("loadend");    },        /**     * Property: markerClick     *      * Parameters:     * evt - {Event}      */    markerClick: function(evt) {        var sameMarkerClicked = (this == this.layer.selectedFeature);        this.layer.selectedFeature = (!sameMarkerClicked) ? this : null;        for(var i=0; i < this.layer.map.popups.length; i++) {            this.layer.map.removePopup(this.layer.map.popups[i]);        }        if (!sameMarkerClicked) {            this.layer.map.addPopup(this.createPopup());         }        OpenLayers.Event.stop(evt);    },    /**     * Method: clearFeatures     */    clearFeatures: function() {        if (this.features != null) {            while(this.features.length > 0) {                var feature = this.features[0];                OpenLayers.Util.removeItem(this.features, feature);                feature.destroy();            }        }            },    CLASS_NAME: "OpenLayers.Layer.Text"});