1fd32e0ff8
git-svn-id: http://svn.openlayers.org/trunk/openlayers@9258 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
372 lines
11 KiB
JavaScript
372 lines
11 KiB
JavaScript
/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
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* license. See http://svn.openlayers.org/trunk/openlayers/license.txt 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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*/
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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 WMS request on mouse moves. This will cause the
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* "hoverfeature" and "outfeature" events to be triggered.
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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: maxFeatures
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* {Integer} maximum number of features to return from a WMS query. This
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* has the same effect as the feature_count parameter on WMS GetFeatureInfo
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* requests. Will be ignored for box selections.
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*/
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maxFeatures: 10,
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/**
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* Property: layers
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* {<Array(OpenLayers.Layer.WMS>} The Layer objects for which to find
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* feature info. If omitted, search all WMS layers from the map whose url
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* is the same as the one in this control's configuration. See the
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* <queryVisible> property
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*/
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layers: null,
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/**
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* Property: queryVisible
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* {Boolean} If true, filter out hidden layers when searching the map for
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* layers to query. If an explicit layers parameter is set, then this does
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* nothing.
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*/
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queryVisible: false,
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/**
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* Property: url
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* {String} The URL of the WMS service to use.
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*/
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url: null,
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/**
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* Property: infoFormat
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* {String} The mimetype to request from the server
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*/
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infoFormat: 'text/html',
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/**
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* Property: 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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* Property: formats
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* An object mapping from mime-types to OL Format objects to use when
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* parsing GFI responses. The default mapping is
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* (start code)
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* {
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* 'application/vnd.ogc.gml': new OpenLayers.Format.WMSGetFeatureInfo()
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* }
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* (end)
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* An object provided here will extend the default mapping.
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*/
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formats: 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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handlerOptions: null,
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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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* Constant: EVENT_TYPES
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*
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* Supported event types:
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* - *getfeatureinfo* Triggered when a GetFeatureInfo response is received.
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* The event object has a text property with:
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* text: a string containing the body of the response,
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* features: an array of the parsed features, if parsing succeeded.
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* xy: the position of the mouse click or hover event that
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* triggered the request
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*/
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EVENT_TYPES: ["getfeatureinfo"],
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/**
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* Constructor: <OpenLayers.Control.SelectFeature>
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*
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* Parameters:
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* url - {String}
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* options - {Object}
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*/
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initialize: function(url, options) {
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// concatenate events specific to vector with those from the base
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this.EVENT_TYPES =
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OpenLayers.Control.WMSGetFeatureInfo.prototype.EVENT_TYPES.concat(
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OpenLayers.Control.prototype.EVENT_TYPES
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);
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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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this.url = url;
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this.layers = options.layers;
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this.formats = OpenLayers.Util.extend({
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'application/vnd.ogc.gml': new OpenLayers.Format.WMSGetFeatureInfo()
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}, options.formats);
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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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this.handler = new OpenLayers.Handler.Click(this,
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{click: this.getInfoForClick}, this.handlerOptions.click || {});
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}
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},
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/**
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* Method: activate
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* Activates the control.
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*
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* Returns:
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* {Boolean} The control was effectively activated.
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*/
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activate: function () {
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if (!this.active) {
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this.handler.activate();
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}
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return OpenLayers.Control.prototype.activate.apply(
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this, arguments
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);
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},
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/**
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* Method: deactivate
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* Deactivates the control.
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*
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* Returns:
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* {Boolean} The control was effectively deactivated.
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*/
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deactivate: function () {
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return OpenLayers.Control.prototype.deactivate.apply(
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this, arguments
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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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// 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.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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if (this.layers) return this.layers;
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var layers = [];
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for (var i = 0, len = this.map.layers.length; i < len; i++) {
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var mapLayer = this.map.layers[i];
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if (mapLayer instanceof OpenLayers.Layer.WMS
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&& mapLayer.url === this.url
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&& (!this.queryVisible || mapLayer.getVisibility())) {
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layers.push(mapLayer);
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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: request
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* Sends a GetFeatureInfo request to the WMS
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*
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* Parameters:
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* clickPosition - The position on the map where the mouse event occurred
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* options - {Object} additional options for this method.
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*
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* Valid options:
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* - *hover* {Boolean} true if we do the request for the hover handler
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*/
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request: function(clickPosition, options) {
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options = options || {};
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var layerNames = [];
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var styleNames = [];
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var layers = this.findLayers();
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for (var i = 0, len = layers.length; i < len; i++) {
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layerNames = layerNames.concat(layers[i].params.LAYERS);
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// in the event of a WMS layer bundling multiple layers but not
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// specifying styles,we need the same number of commas to specify
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// the default style for each of the layers. We can't just leave it
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// blank as we may be including other layers that do specify styles.
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if (layers[i].params.STYLES) {
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styleNames = styleNames.concat(layers[i].params.STYLES);
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} else {
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if (layers[i].params.LAYERS instanceof Array) {
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styleNames = styleNames.concat(new Array(layers[i].params.LAYERS.length));
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} else { // Assume it's a String
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styleNames = styleNames.concat(layers[i].params.LAYERS.replace(/[^,]/g, ""));
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}
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}
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}
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var wmsOptions = {
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url: this.url,
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params: OpenLayers.Util.applyDefaults({
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service: "WMS",
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version: "1.1.0",
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request: 'getfeatureinfo',
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layers: layerNames,
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query_layers: layerNames,
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styles: styleNames,
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bbox: this.map.getExtent().toBBOX(),
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srs: this.map.getProjection(),
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feature_count: this.maxFeatures,
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x: clickPosition.x,
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y: clickPosition.y,
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height: this.map.getSize().h,
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width: this.map.getSize().w,
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info_format: this.infoFormat
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}, this.vendorParams),
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callback: this.handleResponse,
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scope: OpenLayers.Util.extend({
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xy: clickPosition
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}, this)
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};
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var response = OpenLayers.Request.GET(wmsOptions);
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if (options.hover === true) {
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this.hoverRequest = response.priv;
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}
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},
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/**
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* Method: handleResponse
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* Handler for the GetFeatureInfo response. Will be called in an extended
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* scope of this instance plus an xy property with the click position.
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*
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* Parameters:
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* response - {Object}
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*/
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handleResponse: function(response) {
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var features;
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var fmt = this.formats[
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response.getResponseHeader("Content-type").split(";")[0]
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];
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if (fmt) {
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features = fmt.read(response.responseXml ||
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response.responseText);
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}
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this.events.triggerEvent("getfeatureinfo", {
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text: response.responseText,
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features: features,
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xy: this.xy
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});
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// Reset the cursor.
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OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait");
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},
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/**
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* Method: setMap
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* Set the map property for the control.
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*
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* Parameters:
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* map - {<OpenLayers.Map>}
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*/
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setMap: function(map) {
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this.handler.setMap(map);
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OpenLayers.Control.prototype.setMap.apply(this, arguments);
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},
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CLASS_NAME: "OpenLayers.Control.WMSGetFeatureInfo"
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});
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