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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the 2-clause BSD license.
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* See license.txt in the OpenLayers distribution or repository for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Control.js
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* @requires OpenLayers/Handler/Click.js
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* @requires OpenLayers/Handler/Hover.js
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* @requires OpenLayers/Request.js
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* @requires OpenLayers/Format/WMSGetFeatureInfo.js
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*/
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/**
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* Class: OpenLayers.Control.WMSGetFeatureInfo
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* The WMSGetFeatureInfo control uses a WMS query to get information about a point on the map. The
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* information may be in a display-friendly format such as HTML, or a machine-friendly format such
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* as GML, depending on the server's capabilities and the client's configuration. This control
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* handles click or hover events, attempts to parse the results using an OpenLayers.Format, and
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* fires a 'getfeatureinfo' event with the click position, the raw body of the response, and an
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* array of features if it successfully read the response.
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*
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* Inherits from:
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* - <OpenLayers.Control>
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*/
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OpenLayers.Control.WMSGetFeatureInfo = OpenLayers.Class(OpenLayers.Control, {
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/**
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* APIProperty: hover
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* {Boolean} Send GetFeatureInfo requests when mouse stops moving.
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* Default is false.
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*/
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hover: false,
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/**
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* APIProperty: drillDown
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* {Boolean} Drill down over all WMS layers in the map. When
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* using drillDown mode, hover is not possible, and an infoFormat that
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* returns parseable features is required. Default is false.
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*/
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drillDown: false,
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/**
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* APIProperty: maxFeatures
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* {Integer} Maximum number of features to return from a WMS query. This
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* sets the feature_count parameter on WMS GetFeatureInfo
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* requests.
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*/
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maxFeatures: 10,
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/**
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* APIProperty: clickCallback
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* {String} The click callback to register in the
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* {<OpenLayers.Handler.Click>} object created when the hover
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* option is set to false. Default is "click".
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*/
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clickCallback: "click",
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/**
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* APIProperty: output
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* {String} Either "features" or "object". When triggering a getfeatureinfo
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* request should we pass on an array of features or an object with with
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* a "features" property and other properties (such as the url of the
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* WMS). Default is "features".
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*/
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output: "features",
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/**
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* APIProperty: layers
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* {Array(<OpenLayers.Layer.WMS>)} The layers to query for feature info.
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* If omitted, all map WMS layers with a url that matches this <url> or
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* <layerUrls> will be considered.
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*/
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layers: null,
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/**
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* APIProperty: queryVisible
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* {Boolean} If true, filter out hidden layers when searching the map for
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* layers to query. Default is false.
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*/
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queryVisible: false,
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/**
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* APIProperty: url
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* {String} The URL of the WMS service to use. If not provided, the url
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* of the first eligible layer will be used.
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*/
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url: null,
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/**
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* APIProperty: layerUrls
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* {Array(String)} Optional list of urls for layers that should be queried.
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* This can be used when the layer url differs from the url used for
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* making GetFeatureInfo requests (in the case of a layer using cached
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* tiles).
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*/
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layerUrls: null,
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/**
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* APIProperty: infoFormat
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* {String} The mimetype to request from the server. If you are using
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* drillDown mode and have multiple servers that do not share a common
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* infoFormat, you can override the control's infoFormat by providing an
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* INFO_FORMAT parameter in your <OpenLayers.Layer.WMS> instance(s).
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*/
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infoFormat: 'text/html',
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/**
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* APIProperty: vendorParams
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* {Object} Additional parameters that will be added to the request, for
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* WMS implementations that support them. This could e.g. look like
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* (start code)
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* {
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* radius: 5
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* }
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* (end)
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*/
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vendorParams: {},
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/**
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* APIProperty: format
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* {<OpenLayers.Format>} A format for parsing GetFeatureInfo responses.
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* Default is <OpenLayers.Format.WMSGetFeatureInfo>.
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*/
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format: null,
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/**
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* APIProperty: formatOptions
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* {Object} Optional properties to set on the format (if one is not provided
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* in the <format> property.
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*/
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formatOptions: null,
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/**
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* APIProperty: handlerOptions
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* {Object} Additional options for the handlers used by this control, e.g.
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* (start code)
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* {
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* "click": {delay: 100},
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* "hover": {delay: 300}
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* }
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* (end)
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*/
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/**
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* Property: handler
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* {Object} Reference to the <OpenLayers.Handler> for this control
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*/
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handler: null,
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/**
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* Property: hoverRequest
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* {<OpenLayers.Request>} contains the currently running hover request
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* (if any).
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*/
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hoverRequest: null,
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/**
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* APIProperty: events
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* {<OpenLayers.Events>} Events instance for listeners and triggering
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* control specific events.
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*
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* Register a listener for a particular event with the following syntax:
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* (code)
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* control.events.register(type, obj, listener);
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* (end)
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*
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* Supported event types (in addition to those from <OpenLayers.Control.events>):
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* beforegetfeatureinfo - Triggered before the request is sent.
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* The event object has an *xy* property with the position of the
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* mouse click or hover event that triggers the request.
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* nogetfeatureinfo - no queryable layers were found.
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* getfeatureinfo - Triggered when a GetFeatureInfo response is received.
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* The event object has a *text* property with the body of the
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* response (String), a *features* property with an array of the
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* parsed features, an *xy* property with the position of the mouse
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* click or hover event that triggered the request, and a *request*
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* property with the request itself. If drillDown is set to true and
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* multiple requests were issued to collect feature info from all
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* layers, *text* and *request* will only contain the response body
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* and request object of the last request.
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*/
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/**
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* Constructor: <OpenLayers.Control.WMSGetFeatureInfo>
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*
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* Parameters:
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* options - {Object}
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*/
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initialize: function(options) {
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options = options || {};
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options.handlerOptions = options.handlerOptions || {};
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OpenLayers.Control.prototype.initialize.apply(this, [options]);
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if(!this.format) {
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this.format = new OpenLayers.Format.WMSGetFeatureInfo(
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options.formatOptions
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);
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}
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if(this.drillDown === true) {
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this.hover = false;
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}
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if(this.hover) {
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this.handler = new OpenLayers.Handler.Hover(
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this, {
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'move': this.cancelHover,
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'pause': this.getInfoForHover
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},
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OpenLayers.Util.extend(this.handlerOptions.hover || {}, {
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'delay': 250
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}));
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} else {
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var callbacks = {};
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callbacks[this.clickCallback] = this.getInfoForClick;
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this.handler = new OpenLayers.Handler.Click(
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this, callbacks, this.handlerOptions.click || {});
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}
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},
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/**
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* Method: getInfoForClick
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* Called on click
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*
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* Parameters:
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* evt - {<OpenLayers.Event>}
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*/
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getInfoForClick: function(evt) {
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this.events.triggerEvent("beforegetfeatureinfo", {xy: evt.xy});
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// Set the cursor to "wait" to tell the user we're working on their
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// click.
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OpenLayers.Element.addClass(this.map.viewPortDiv, "olCursorWait");
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this.request(evt.xy, {});
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},
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/**
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* Method: getInfoForHover
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* Pause callback for the hover handler
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*
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* Parameters:
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* evt - {Object}
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*/
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getInfoForHover: function(evt) {
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this.events.triggerEvent("beforegetfeatureinfo", {xy: evt.xy});
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this.request(evt.xy, {hover: true});
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},
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/**
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* Method: cancelHover
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* Cancel callback for the hover handler
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*/
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cancelHover: function() {
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if (this.hoverRequest) {
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this.hoverRequest.abort();
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this.hoverRequest = null;
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}
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},
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/**
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* Method: findLayers
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* Internal method to get the layers, independent of whether we are
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* inspecting the map or using a client-provided array
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*/
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findLayers: function() {
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var candidates = this.layers || this.map.layers;
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var layers = [];
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var layer, url;
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for(var i = candidates.length - 1; i >= 0; --i) {
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layer = candidates[i];
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if(layer instanceof OpenLayers.Layer.WMS &&
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(!this.queryVisible || layer.getVisibility())) {
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url = OpenLayers.Util.isArray(layer.url) ? layer.url[0] : layer.url;
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// if the control was not configured with a url, set it
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// to the first layer url
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if(this.drillDown === false && !this.url) {
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this.url = url;
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}
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if(this.drillDown === true || this.urlMatches(url)) {
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layers.push(layer);
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}
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}
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}
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return layers;
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},
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/**
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* Method: urlMatches
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* Test to see if the provided url matches either the control <url> or one
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* of the <layerUrls>.
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*
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* Parameters:
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* url - {String} The url to test.
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*
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* Returns:
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* {Boolean} The provided url matches the control <url> or one of the
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* <layerUrls>.
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*/
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urlMatches: function(url) {
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var matches = OpenLayers.Util.isEquivalentUrl(this.url, url);
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if(!matches && this.layerUrls) {
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for(var i=0, len=this.layerUrls.length; i<len; ++i) {
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if(OpenLayers.Util.isEquivalentUrl(this.layerUrls[i], url)) {
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matches = true;
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break;
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}
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}
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}
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return matches;
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},
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/**
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* Method: buildWMSOptions
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* Build an object with the relevant WMS options for the GetFeatureInfo request
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*
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* Parameters:
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* url - {String} The url to be used for sending the request
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* layers - {Array(<OpenLayers.Layer.WMS)} An array of layers
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* clickPosition - {<OpenLayers.Pixel>} The position on the map where the mouse
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* event occurred.
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* format - {String} The format from the corresponding GetMap request
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*/
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buildWMSOptions: function(url, layers, clickPosition, format) {
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var layerNames = [], styleNames = [];
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for (var i = 0, len = layers.length; i < len; i++) {
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if (layers[i].params.LAYERS != null) {
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layerNames = layerNames.concat(layers[i].params.LAYERS);
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styleNames = styleNames.concat(this.getStyleNames(layers[i]));
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}
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}
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var firstLayer = layers[0];
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// use the firstLayer's projection if it matches the map projection -
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// this assumes that all layers will be available in this projection
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var projection = this.map.getProjection();
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var layerProj = firstLayer.projection;
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if (layerProj && layerProj.equals(this.map.getProjectionObject())) {
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projection = layerProj.getCode();
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}
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var params = OpenLayers.Util.extend({
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service: "WMS",
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version: firstLayer.params.VERSION,
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request: "GetFeatureInfo",
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exceptions: firstLayer.params.EXCEPTIONS,
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bbox: this.map.getExtent().toBBOX(null,
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firstLayer.reverseAxisOrder()),
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feature_count: this.maxFeatures,
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height: this.map.getSize().h,
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width: this.map.getSize().w,
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format: format,
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info_format: firstLayer.params.INFO_FORMAT || this.infoFormat
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}, (parseFloat(firstLayer.params.VERSION) >= 1.3) ?
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{
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crs: projection,
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i: parseInt(clickPosition.x),
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j: parseInt(clickPosition.y)
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} :
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{
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srs: projection,
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x: parseInt(clickPosition.x),
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y: parseInt(clickPosition.y)
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}
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);
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if (layerNames.length != 0) {
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params = OpenLayers.Util.extend({
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layers: layerNames,
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query_layers: layerNames,
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styles: styleNames
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}, params);
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}
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OpenLayers.Util.applyDefaults(params, this.vendorParams);
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return {
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url: url,
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params: OpenLayers.Util.upperCaseObject(params),
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callback: function(request) {
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this.handleResponse(clickPosition, request, url);
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},
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scope: this
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};
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},
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384
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/**
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385
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* Method: getStyleNames
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386
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* Gets the STYLES parameter for the layer. Make sure the STYLES parameter
|
|
387
|
* matches the LAYERS parameter
|
|
388
|
*
|
|
389
|
* Parameters:
|
|
390
|
* layer - {<OpenLayers.Layer.WMS>}
|
|
391
|
*
|
|
392
|
* Returns:
|
|
393
|
* {Array(String)} The STYLES parameter
|
|
394
|
*/
|
|
395
|
getStyleNames: function(layer) {
|
|
396
|
// in the event of a WMS layer bundling multiple layers but not
|
|
397
|
// specifying styles,we need the same number of commas to specify
|
|
398
|
// the default style for each of the layers. We can't just leave it
|
|
399
|
// blank as we may be including other layers that do specify styles.
|
|
400
|
var styleNames;
|
|
401
|
if (layer.params.STYLES) {
|
|
402
|
styleNames = layer.params.STYLES;
|
|
403
|
} else {
|
|
404
|
if (OpenLayers.Util.isArray(layer.params.LAYERS)) {
|
|
405
|
styleNames = new Array(layer.params.LAYERS.length);
|
|
406
|
} else { // Assume it's a String
|
|
407
|
styleNames = layer.params.LAYERS.replace(/[^,]/g, "");
|
|
408
|
}
|
|
409
|
}
|
|
410
|
return styleNames;
|
|
411
|
},
|
|
412
|
|
|
413
|
/**
|
|
414
|
* Method: request
|
|
415
|
* Sends a GetFeatureInfo request to the WMS
|
|
416
|
*
|
|
417
|
* Parameters:
|
|
418
|
* clickPosition - {<OpenLayers.Pixel>} The position on the map where the
|
|
419
|
* mouse event occurred.
|
|
420
|
* options - {Object} additional options for this method.
|
|
421
|
*
|
|
422
|
* Valid options:
|
|
423
|
* - *hover* {Boolean} true if we do the request for the hover handler
|
|
424
|
*/
|
|
425
|
request: function(clickPosition, options) {
|
|
426
|
var layers = this.findLayers();
|
|
427
|
if(layers.length == 0) {
|
|
428
|
this.events.triggerEvent("nogetfeatureinfo");
|
|
429
|
// Reset the cursor.
|
|
430
|
OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait");
|
|
431
|
return;
|
|
432
|
}
|
|
433
|
|
|
434
|
options = options || {};
|
|
435
|
if(this.drillDown === false) {
|
|
436
|
var wmsOptions = this.buildWMSOptions(this.url, layers,
|
|
437
|
clickPosition, layers[0].params.FORMAT);
|
|
438
|
var request = OpenLayers.Request.GET(wmsOptions);
|
|
439
|
|
|
440
|
if (options.hover === true) {
|
|
441
|
this.hoverRequest = request;
|
|
442
|
}
|
|
443
|
} else {
|
|
444
|
this._requestCount = 0;
|
|
445
|
this._numRequests = 0;
|
|
446
|
this.features = [];
|
|
447
|
// group according to service url to combine requests
|
|
448
|
var services = {}, url;
|
|
449
|
for(var i=0, len=layers.length; i<len; i++) {
|
|
450
|
var layer = layers[i];
|
|
451
|
var service, found = false;
|
|
452
|
url = OpenLayers.Util.isArray(layer.url) ? layer.url[0] : layer.url;
|
|
453
|
if(url in services) {
|
|
454
|
services[url].push(layer);
|
|
455
|
} else {
|
|
456
|
this._numRequests++;
|
|
457
|
services[url] = [layer];
|
|
458
|
}
|
|
459
|
}
|
|
460
|
var layers;
|
|
461
|
for (var url in services) {
|
|
462
|
layers = services[url];
|
|
463
|
var wmsOptions = this.buildWMSOptions(url, layers,
|
|
464
|
clickPosition, layers[0].params.FORMAT);
|
|
465
|
OpenLayers.Request.GET(wmsOptions);
|
|
466
|
}
|
|
467
|
}
|
|
468
|
},
|
|
469
|
|
|
470
|
/**
|
|
471
|
* Method: triggerGetFeatureInfo
|
|
472
|
* Trigger the getfeatureinfo event when all is done
|
|
473
|
*
|
|
474
|
* Parameters:
|
|
475
|
* request - {XMLHttpRequest} The request object
|
|
476
|
* xy - {<OpenLayers.Pixel>} The position on the map where the
|
|
477
|
* mouse event occurred.
|
|
478
|
* features - {Array(<OpenLayers.Feature.Vector>)} or
|
|
479
|
* {Array({Object}) when output is "object". The object has a url and a
|
|
480
|
* features property which contains an array of features.
|
|
481
|
*/
|
|
482
|
triggerGetFeatureInfo: function(request, xy, features) {
|
|
483
|
this.events.triggerEvent("getfeatureinfo", {
|
|
484
|
text: request.responseText,
|
|
485
|
features: features,
|
|
486
|
request: request,
|
|
487
|
xy: xy
|
|
488
|
});
|
|
489
|
|
|
490
|
// Reset the cursor.
|
|
491
|
OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait");
|
|
492
|
},
|
|
493
|
|
|
494
|
/**
|
|
495
|
* Method: handleResponse
|
|
496
|
* Handler for the GetFeatureInfo response.
|
|
497
|
*
|
|
498
|
* Parameters:
|
|
499
|
* xy - {<OpenLayers.Pixel>} The position on the map where the
|
|
500
|
* mouse event occurred.
|
|
501
|
* request - {XMLHttpRequest} The request object.
|
|
502
|
* url - {String} The url which was used for this request.
|
|
503
|
*/
|
|
504
|
handleResponse: function(xy, request, url) {
|
|
505
|
|
|
506
|
var doc = request.responseXML;
|
|
507
|
if(!doc || !doc.documentElement) {
|
|
508
|
doc = request.responseText;
|
|
509
|
}
|
|
510
|
var features = this.format.read(doc);
|
|
511
|
if (this.drillDown === false) {
|
|
512
|
this.triggerGetFeatureInfo(request, xy, features);
|
|
513
|
} else {
|
|
514
|
this._requestCount++;
|
|
515
|
if (this.output === "object") {
|
|
516
|
this._features = (this._features || []).concat(
|
|
517
|
{url: url, features: features}
|
|
518
|
);
|
|
519
|
} else {
|
|
520
|
this._features = (this._features || []).concat(features);
|
|
521
|
}
|
|
522
|
if (this._requestCount === this._numRequests) {
|
|
523
|
this.triggerGetFeatureInfo(request, xy, this._features.concat());
|
|
524
|
delete this._features;
|
|
525
|
delete this._requestCount;
|
|
526
|
delete this._numRequests;
|
|
527
|
}
|
|
528
|
}
|
|
529
|
},
|
|
530
|
|
|
531
|
CLASS_NAME: "OpenLayers.Control.WMSGetFeatureInfo"
|
|
532
|
});
|