521 lines
18 KiB
JavaScript
521 lines
18 KiB
JavaScript
/* Copyright (c) 2006-2012 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the Clear BSD license.
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* 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 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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/** 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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/** APIProperty: output
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* {String} Either "features" or "object". When triggering a
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* getfeatureinfo request should we pass on an array of features
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* or an object with with a "features" property and other properties
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* (such as the url of the WMS). Default is "features".
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*/
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output: "features",
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/**
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* Property: 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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* 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. Default is false.
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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. 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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* Property: 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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* Property: 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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* 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: 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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* Property: 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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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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* Supported event types (in addition to those from <OpenLayers.Control>):
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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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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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/**
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* Method: getStyleNames
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* Gets the STYLES parameter for the layer. Make sure the STYLES parameter
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* matches the LAYERS parameter
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*
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* Parameters:
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* layer - {<OpenLayers.Layer.WMS>}
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*
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* Returns:
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* {Array(String)} The STYLES parameter
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*/
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getStyleNames: function(layer) {
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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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var styleNames;
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if (layer.params.STYLES) {
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styleNames = layer.params.STYLES;
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} else {
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if (OpenLayers.Util.isArray(layer.params.LAYERS)) {
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styleNames = new Array(layer.params.LAYERS.length);
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} else { // Assume it's a String
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styleNames = layer.params.LAYERS.replace(/[^,]/g, "");
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}
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}
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return styleNames;
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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 - {<OpenLayers.Pixel>} The position on the map where the
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* 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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var layers = this.findLayers();
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if(layers.length == 0) {
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this.events.triggerEvent("nogetfeatureinfo");
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// Reset the cursor.
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OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait");
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return;
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}
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options = options || {};
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if(this.drillDown === false) {
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var wmsOptions = this.buildWMSOptions(this.url, layers,
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clickPosition, layers[0].params.FORMAT);
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var request = OpenLayers.Request.GET(wmsOptions);
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if (options.hover === true) {
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this.hoverRequest = request;
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}
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} else {
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this._requestCount = 0;
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this._numRequests = 0;
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this.features = [];
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// group according to service url to combine requests
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var services = {}, url;
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for(var i=0, len=layers.length; i<len; i++) {
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var layer = layers[i];
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var service, found = false;
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url = OpenLayers.Util.isArray(layer.url) ? layer.url[0] : layer.url;
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if(url in services) {
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services[url].push(layer);
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} else {
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this._numRequests++;
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services[url] = [layer];
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}
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}
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var layers;
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for (var url in services) {
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layers = services[url];
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var wmsOptions = this.buildWMSOptions(url, layers,
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clickPosition, layers[0].params.FORMAT);
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OpenLayers.Request.GET(wmsOptions);
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}
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}
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},
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/**
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* Method: triggerGetFeatureInfo
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* Trigger the getfeatureinfo event when all is done
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*
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* Parameters:
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* request - {XMLHttpRequest} The request object
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* xy - {<OpenLayers.Pixel>} The position on the map where the
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* mouse event occurred.
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* features - {Array(<OpenLayers.Feature.Vector>)} or
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* {Array({Object}) when output is "object". The object has a url and a
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* features property which contains an array of features.
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*/
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triggerGetFeatureInfo: function(request, xy, features) {
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this.events.triggerEvent("getfeatureinfo", {
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text: request.responseText,
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features: features,
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request: request,
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xy: 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: handleResponse
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* Handler for the GetFeatureInfo response.
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*
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* Parameters:
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* xy - {<OpenLayers.Pixel>} The position on the map where the
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* mouse event occurred.
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* request - {XMLHttpRequest} The request object.
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* url - {String} The url which was used for this request.
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*/
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handleResponse: function(xy, request, url) {
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var doc = request.responseXML;
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if(!doc || !doc.documentElement) {
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doc = request.responseText;
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}
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var features = this.format.read(doc);
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if (this.drillDown === false) {
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this.triggerGetFeatureInfo(request, xy, features);
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} else {
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this._requestCount++;
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if (this.output === "object") {
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this._features = (this._features || []).concat(
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{url: url, features: features}
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);
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} else {
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this._features = (this._features || []).concat(features);
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}
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if (this._requestCount === this._numRequests) {
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this.triggerGetFeatureInfo(request, xy, this._features.concat());
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delete this._features;
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delete this._requestCount;
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delete this._numRequests;
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}
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}
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},
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CLASS_NAME: "OpenLayers.Control.WMSGetFeatureInfo"
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});
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