[76] | 1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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| 2 | * full list of contributors). Published under the Clear BSD license. |
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| 3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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| 4 | * full text of the license. */ |
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| 5 | |
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| 6 | |
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| 7 | /** |
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| 8 | * @requires OpenLayers/Control.js |
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| 9 | * @requires OpenLayers/Handler/Click.js |
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| 10 | * @requires OpenLayers/Handler/Hover.js |
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| 11 | * @requires OpenLayers/Request.js |
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| 12 | */ |
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| 13 | |
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| 14 | /** |
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| 15 | * Class: OpenLayers.Control.WMSGetFeatureInfo |
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| 16 | * The WMSGetFeatureInfo control uses a WMS query to get information about a point on the map. The |
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| 17 | * information may be in a display-friendly format such as HTML, or a machine-friendly format such |
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| 18 | * as GML, depending on the server's capabilities and the client's configuration. This control |
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| 19 | * handles click or hover events, attempts to parse the results using an OpenLayers.Format, and |
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| 20 | * fires a 'getfeatureinfo' event with the click position, the raw body of the response, and an |
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| 21 | * array of features if it successfully read the response. |
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| 22 | * |
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| 23 | * Inherits from: |
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| 24 | * - <OpenLayers.Control> |
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| 25 | */ |
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| 26 | OpenLayers.Control.WMSGetFeatureInfo = OpenLayers.Class(OpenLayers.Control, { |
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| 27 | |
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| 28 | /** |
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| 29 | * APIProperty: hover |
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| 30 | * {Boolean} Send GetFeatureInfo requests when mouse stops moving. |
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| 31 | * Default is false. |
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| 32 | */ |
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| 33 | hover: false, |
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| 34 | |
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| 35 | /** |
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| 36 | * APIProperty: drillDown |
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| 37 | * {Boolean} Drill down over all WMS layers in the map. When |
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| 38 | * using drillDown mode, hover is not possible, and an infoFormat that |
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| 39 | * returns parseable features is required. Default is false. |
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| 40 | */ |
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| 41 | drillDown: false, |
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| 42 | |
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| 43 | /** |
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| 44 | * APIProperty: maxFeatures |
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| 45 | * {Integer} Maximum number of features to return from a WMS query. This |
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| 46 | * sets the feature_count parameter on WMS GetFeatureInfo |
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| 47 | * requests. |
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| 48 | */ |
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| 49 | maxFeatures: 10, |
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| 50 | |
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| 51 | /** APIProperty: clickCallback |
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| 52 | * {String} The click callback to register in the |
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| 53 | * {<OpenLayers.Handler.Click>} object created when the hover |
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| 54 | * option is set to false. Default is "click". |
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| 55 | */ |
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| 56 | clickCallback: "click", |
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| 57 | |
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| 58 | /** |
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| 59 | * Property: layers |
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| 60 | * {Array(<OpenLayers.Layer.WMS>)} The layers to query for feature info. |
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| 61 | * If omitted, all map WMS layers with a url that matches this <url> or |
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| 62 | * <layerUrls> will be considered. |
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| 63 | */ |
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| 64 | layers: null, |
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| 65 | |
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| 66 | /** |
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| 67 | * Property: queryVisible |
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| 68 | * {Boolean} If true, filter out hidden layers when searching the map for |
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| 69 | * layers to query. Default is false. |
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| 70 | */ |
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| 71 | queryVisible: false, |
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| 72 | |
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| 73 | /** |
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| 74 | * Property: url |
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| 75 | * {String} The URL of the WMS service to use. If not provided, the url |
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| 76 | * of the first eligible layer will be used. |
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| 77 | */ |
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| 78 | url: null, |
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| 79 | |
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| 80 | /** |
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| 81 | * Property: layerUrls |
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| 82 | * {Array(String)} Optional list of urls for layers that should be queried. |
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| 83 | * This can be used when the layer url differs from the url used for |
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| 84 | * making GetFeatureInfo requests (in the case of a layer using cached |
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| 85 | * tiles). |
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| 86 | */ |
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| 87 | layerUrls: null, |
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| 88 | |
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| 89 | /** |
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| 90 | * Property: infoFormat |
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| 91 | * {String} The mimetype to request from the server |
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| 92 | */ |
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| 93 | infoFormat: 'text/html', |
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| 94 | |
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| 95 | /** |
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| 96 | * Property: vendorParams |
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| 97 | * {Object} Additional parameters that will be added to the request, for |
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| 98 | * WMS implementations that support them. This could e.g. look like |
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| 99 | * (start code) |
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| 100 | * { |
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| 101 | * radius: 5 |
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| 102 | * } |
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| 103 | * (end) |
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| 104 | */ |
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| 105 | vendorParams: {}, |
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| 106 | |
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| 107 | /** |
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| 108 | * Property: format |
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| 109 | * {<OpenLayers.Format>} A format for parsing GetFeatureInfo responses. |
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| 110 | * Default is <OpenLayers.Format.WMSGetFeatureInfo>. |
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| 111 | */ |
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| 112 | format: null, |
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| 113 | |
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| 114 | /** |
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| 115 | * Property: formatOptions |
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| 116 | * {Object} Optional properties to set on the format (if one is not provided |
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| 117 | * in the <format> property. |
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| 118 | */ |
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| 119 | formatOptions: null, |
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| 120 | |
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| 121 | /** |
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| 122 | * APIProperty: handlerOptions |
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| 123 | * {Object} Additional options for the handlers used by this control, e.g. |
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| 124 | * (start code) |
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| 125 | * { |
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| 126 | * "click": {delay: 100}, |
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| 127 | * "hover": {delay: 300} |
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| 128 | * } |
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| 129 | * (end) |
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| 130 | */ |
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| 131 | handlerOptions: null, |
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| 132 | |
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| 133 | /** |
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| 134 | * Property: handler |
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| 135 | * {Object} Reference to the <OpenLayers.Handler> for this control |
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| 136 | */ |
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| 137 | handler: null, |
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| 138 | |
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| 139 | /** |
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| 140 | * Property: hoverRequest |
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| 141 | * {<OpenLayers.Request>} contains the currently running hover request |
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| 142 | * (if any). |
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| 143 | */ |
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| 144 | hoverRequest: null, |
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| 145 | |
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| 146 | /** |
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| 147 | * Constant: EVENT_TYPES |
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| 148 | * |
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| 149 | * Supported event types (in addition to those from <OpenLayers.Control>): |
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| 150 | * beforegetfeatureinfo - Triggered before the request is sent. |
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| 151 | * The event object has an *xy* property with the position of the |
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| 152 | * mouse click or hover event that triggers the request. |
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| 153 | * nogetfeatureinfo - no queryable layers were found. |
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| 154 | * getfeatureinfo - Triggered when a GetFeatureInfo response is received. |
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| 155 | * The event object has a *text* property with the body of the |
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| 156 | * response (String), a *features* property with an array of the |
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| 157 | * parsed features, an *xy* property with the position of the mouse |
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| 158 | * click or hover event that triggered the request, and a *request* |
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| 159 | * property with the request itself. If drillDown is set to true and |
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| 160 | * multiple requests were issued to collect feature info from all |
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| 161 | * layers, *text* and *request* will only contain the response body |
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| 162 | * and request object of the last request. |
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| 163 | */ |
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| 164 | EVENT_TYPES: ["beforegetfeatureinfo", "nogetfeatureinfo", "getfeatureinfo"], |
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| 165 | |
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| 166 | /** |
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| 167 | * Constructor: <OpenLayers.Control.WMSGetFeatureInfo> |
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| 168 | * |
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| 169 | * Parameters: |
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| 170 | * options - {Object} |
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| 171 | */ |
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| 172 | initialize: function(options) { |
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| 173 | // concatenate events specific to vector with those from the base |
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| 174 | this.EVENT_TYPES = |
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| 175 | OpenLayers.Control.WMSGetFeatureInfo.prototype.EVENT_TYPES.concat( |
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| 176 | OpenLayers.Control.prototype.EVENT_TYPES |
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| 177 | ); |
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| 178 | |
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| 179 | options = options || {}; |
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| 180 | options.handlerOptions = options.handlerOptions || {}; |
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| 181 | |
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| 182 | OpenLayers.Control.prototype.initialize.apply(this, [options]); |
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| 183 | |
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| 184 | if(!this.format) { |
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| 185 | this.format = new OpenLayers.Format.WMSGetFeatureInfo( |
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| 186 | options.formatOptions |
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| 187 | ); |
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| 188 | } |
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| 189 | |
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| 190 | if(this.drillDown === true) { |
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| 191 | this.hover = false; |
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| 192 | } |
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| 193 | |
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| 194 | if(this.hover) { |
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| 195 | this.handler = new OpenLayers.Handler.Hover( |
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| 196 | this, { |
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| 197 | 'move': this.cancelHover, |
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| 198 | 'pause': this.getInfoForHover |
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| 199 | }, |
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| 200 | OpenLayers.Util.extend(this.handlerOptions.hover || {}, { |
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| 201 | 'delay': 250 |
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| 202 | })); |
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| 203 | } else { |
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| 204 | var callbacks = {}; |
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| 205 | callbacks[this.clickCallback] = this.getInfoForClick; |
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| 206 | this.handler = new OpenLayers.Handler.Click( |
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| 207 | this, callbacks, this.handlerOptions.click || {}); |
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| 208 | } |
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| 209 | }, |
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| 210 | |
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| 211 | /** |
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| 212 | * Method: activate |
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| 213 | * Activates the control. |
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| 214 | * |
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| 215 | * Returns: |
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| 216 | * {Boolean} The control was effectively activated. |
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| 217 | */ |
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| 218 | activate: function () { |
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| 219 | if (!this.active) { |
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| 220 | this.handler.activate(); |
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| 221 | } |
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| 222 | return OpenLayers.Control.prototype.activate.apply( |
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| 223 | this, arguments |
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| 224 | ); |
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| 225 | }, |
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| 226 | |
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| 227 | /** |
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| 228 | * Method: deactivate |
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| 229 | * Deactivates the control. |
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| 230 | * |
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| 231 | * Returns: |
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| 232 | * {Boolean} The control was effectively deactivated. |
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| 233 | */ |
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| 234 | deactivate: function () { |
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| 235 | return OpenLayers.Control.prototype.deactivate.apply( |
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| 236 | this, arguments |
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| 237 | ); |
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| 238 | }, |
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| 239 | |
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| 240 | /** |
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| 241 | * Method: getInfoForClick |
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| 242 | * Called on click |
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| 243 | * |
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| 244 | * Parameters: |
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| 245 | * evt - {<OpenLayers.Event>} |
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| 246 | */ |
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| 247 | getInfoForClick: function(evt) { |
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| 248 | this.events.triggerEvent("beforegetfeatureinfo", {xy: evt.xy}); |
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| 249 | // Set the cursor to "wait" to tell the user we're working on their |
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| 250 | // click. |
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| 251 | OpenLayers.Element.addClass(this.map.viewPortDiv, "olCursorWait"); |
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| 252 | this.request(evt.xy, {}); |
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| 253 | }, |
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| 254 | |
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| 255 | /** |
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| 256 | * Method: getInfoForHover |
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| 257 | * Pause callback for the hover handler |
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| 258 | * |
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| 259 | * Parameters: |
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| 260 | * evt - {Object} |
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| 261 | */ |
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| 262 | getInfoForHover: function(evt) { |
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| 263 | this.events.triggerEvent("beforegetfeatureinfo", {xy: evt.xy}); |
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| 264 | this.request(evt.xy, {hover: true}); |
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| 265 | }, |
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| 266 | |
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| 267 | /** |
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| 268 | * Method: cancelHover |
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| 269 | * Cancel callback for the hover handler |
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| 270 | */ |
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| 271 | cancelHover: function() { |
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| 272 | if (this.hoverRequest) { |
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| 273 | this.hoverRequest.abort(); |
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| 274 | this.hoverRequest = null; |
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| 275 | } |
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| 276 | }, |
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| 277 | |
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| 278 | /** |
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| 279 | * Method: findLayers |
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| 280 | * Internal method to get the layers, independent of whether we are |
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| 281 | * inspecting the map or using a client-provided array |
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| 282 | */ |
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| 283 | findLayers: function() { |
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| 284 | |
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| 285 | var candidates = this.layers || this.map.layers; |
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| 286 | var layers = []; |
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| 287 | var layer, url; |
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| 288 | for(var i=0, len=candidates.length; i<len; ++i) { |
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| 289 | layer = candidates[i]; |
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| 290 | if(layer instanceof OpenLayers.Layer.WMS && |
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| 291 | (!this.queryVisible || layer.getVisibility())) { |
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| 292 | url = layer.url instanceof Array ? layer.url[0] : layer.url; |
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| 293 | // if the control was not configured with a url, set it |
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| 294 | // to the first layer url |
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| 295 | if(this.drillDown === false && !this.url) { |
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| 296 | this.url = url; |
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| 297 | } |
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| 298 | if(this.drillDown === true || this.urlMatches(url)) { |
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| 299 | layers.push(layer); |
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| 300 | } |
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| 301 | } |
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| 302 | } |
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| 303 | return layers; |
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| 304 | }, |
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| 305 | |
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| 306 | /** |
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| 307 | * Method: urlMatches |
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| 308 | * Test to see if the provided url matches either the control <url> or one |
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| 309 | * of the <layerUrls>. |
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| 310 | * |
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| 311 | * Parameters: |
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| 312 | * url - {String} The url to test. |
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| 313 | * |
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| 314 | * Returns: |
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| 315 | * {Boolean} The provided url matches the control <url> or one of the |
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| 316 | * <layerUrls>. |
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| 317 | */ |
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| 318 | urlMatches: function(url) { |
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| 319 | var matches = OpenLayers.Util.isEquivalentUrl(this.url, url); |
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| 320 | if(!matches && this.layerUrls) { |
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| 321 | for(var i=0, len=this.layerUrls.length; i<len; ++i) { |
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| 322 | if(OpenLayers.Util.isEquivalentUrl(this.layerUrls[i], url)) { |
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| 323 | matches = true; |
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| 324 | break; |
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| 325 | } |
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| 326 | } |
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| 327 | } |
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| 328 | return matches; |
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| 329 | }, |
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| 330 | |
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| 331 | /** |
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| 332 | * Method: buildWMSOptions |
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| 333 | * Build an object with the relevant WMS options for the GetFeatureInfo request |
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| 334 | * |
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| 335 | * Parameters: |
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| 336 | * url - {String} The url to be used for sending the request |
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| 337 | * layers - {Array(<OpenLayers.Layer.WMS)} An array of layers |
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| 338 | * clickPosition - {<OpenLayers.Pixel>} The position on the map where the mouse |
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| 339 | * event occurred. |
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| 340 | * format - {String} The format from the corresponding GetMap request |
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| 341 | */ |
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| 342 | buildWMSOptions: function(url, layers, clickPosition, format) { |
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| 343 | var layerNames = [], styleNames = []; |
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| 344 | for (var i = 0, len = layers.length; i < len; i++) { |
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| 345 | layerNames = layerNames.concat(layers[i].params.LAYERS); |
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| 346 | styleNames = styleNames.concat(this.getStyleNames(layers[i])); |
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| 347 | } |
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| 348 | var params = OpenLayers.Util.extend({ |
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| 349 | service: "WMS", |
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| 350 | version: layers[0].params.VERSION, |
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| 351 | request: "GetFeatureInfo", |
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| 352 | layers: layerNames, |
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| 353 | query_layers: layerNames, |
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| 354 | styles: styleNames, |
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| 355 | bbox: this.map.getExtent().toBBOX(null, |
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| 356 | layers[0].reverseAxisOrder()), |
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| 357 | feature_count: this.maxFeatures, |
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| 358 | height: this.map.getSize().h, |
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| 359 | width: this.map.getSize().w, |
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| 360 | format: format, |
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| 361 | info_format: this.infoFormat |
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| 362 | }, (parseFloat(layers[0].params.VERSION) >= 1.3) ? |
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| 363 | { |
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| 364 | crs: this.map.getProjection(), |
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| 365 | i: clickPosition.x, |
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| 366 | j: clickPosition.y |
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| 367 | } : |
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| 368 | { |
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| 369 | srs: this.map.getProjection(), |
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| 370 | x: clickPosition.x, |
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| 371 | y: clickPosition.y |
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| 372 | } |
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| 373 | ); |
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| 374 | OpenLayers.Util.applyDefaults(params, this.vendorParams); |
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| 375 | return { |
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| 376 | url: url, |
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| 377 | params: OpenLayers.Util.upperCaseObject(params), |
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| 378 | callback: function(request) { |
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| 379 | this.handleResponse(clickPosition, request); |
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| 380 | }, |
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| 381 | scope: this |
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| 382 | }; |
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| 383 | }, |
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| 384 | |
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| 385 | /** |
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| 386 | * Method: getStyleNames |
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| 387 | * Gets the STYLES parameter for the layer. Make sure the STYLES parameter |
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| 388 | * matches the LAYERS parameter |
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| 389 | * |
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| 390 | * Parameters: |
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| 391 | * layer - {<OpenLayers.Layer.WMS>} |
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| 392 | * |
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| 393 | * Returns: |
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| 394 | * {Array(String)} The STYLES parameter |
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| 395 | */ |
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| 396 | getStyleNames: function(layer) { |
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| 397 | // in the event of a WMS layer bundling multiple layers but not |
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| 398 | // specifying styles,we need the same number of commas to specify |
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| 399 | // the default style for each of the layers. We can't just leave it |
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| 400 | // blank as we may be including other layers that do specify styles. |
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| 401 | var styleNames; |
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| 402 | if (layer.params.STYLES) { |
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| 403 | styleNames = layer.params.STYLES; |
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| 404 | } else { |
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| 405 | if (layer.params.LAYERS instanceof Array) { |
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| 406 | styleNames = new Array(layer.params.LAYERS.length); |
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| 407 | } else { // Assume it's a String |
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| 408 | styleNames = layer.params.LAYERS.replace(/[^,]/g, ""); |
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| 409 | } |
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| 410 | } |
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| 411 | return styleNames; |
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| 412 | }, |
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| 413 | |
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| 414 | /** |
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| 415 | * Method: request |
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| 416 | * Sends a GetFeatureInfo request to the WMS |
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| 417 | * |
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| 418 | * Parameters: |
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| 419 | * clickPosition - {<OpenLayers.Pixel>} The position on the map where the |
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| 420 | * mouse event occurred. |
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| 421 | * options - {Object} additional options for this method. |
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| 422 | * |
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| 423 | * Valid options: |
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| 424 | * - *hover* {Boolean} true if we do the request for the hover handler |
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| 425 | */ |
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| 426 | request: function(clickPosition, options) { |
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| 427 | var layers = this.findLayers(); |
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| 428 | if(layers.length == 0) { |
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| 429 | this.events.triggerEvent("nogetfeatureinfo"); |
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| 430 | // Reset the cursor. |
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| 431 | OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait"); |
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| 432 | return; |
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| 433 | } |
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| 434 | |
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| 435 | options = options || {}; |
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| 436 | if(this.drillDown === false) { |
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| 437 | var wmsOptions = this.buildWMSOptions(this.url, layers, |
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| 438 | clickPosition, layers[0].params.FORMAT); |
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| 439 | var request = OpenLayers.Request.GET(wmsOptions); |
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| 440 | |
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| 441 | if (options.hover === true) { |
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| 442 | this.hoverRequest = request; |
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| 443 | } |
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| 444 | } else { |
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| 445 | this._requestCount = 0; |
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| 446 | this._numRequests = 0; |
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| 447 | this.features = []; |
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| 448 | // group according to service url to combine requests |
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| 449 | var services = {}, url; |
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| 450 | for(var i=0, len=layers.length; i<len; i++) { |
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| 451 | var layer = layers[i]; |
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| 452 | var service, found = false; |
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| 453 | url = layer.url instanceof Array ? layer.url[0] : layer.url; |
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| 454 | if(url in services) { |
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| 455 | services[url].push(layer); |
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| 456 | } else { |
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| 457 | this._numRequests++; |
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| 458 | services[url] = [layer]; |
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| 459 | } |
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| 460 | } |
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| 461 | var layers; |
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| 462 | for (var url in services) { |
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| 463 | layers = services[url]; |
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| 464 | var wmsOptions = this.buildWMSOptions(url, layers, |
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| 465 | clickPosition, layers[0].params.FORMAT); |
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| 466 | OpenLayers.Request.GET(wmsOptions); |
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| 467 | } |
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| 468 | } |
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| 469 | }, |
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| 470 | |
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| 471 | /** |
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| 472 | * Method: triggerGetFeatureInfo |
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| 473 | * Trigger the getfeatureinfo event when all is done |
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| 474 | * |
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| 475 | * Parameters: |
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| 476 | * request - {XMLHttpRequest} The request object |
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| 477 | * xy - {<OpenLayers.Pixel>} The position on the map where the |
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| 478 | * mouse event occurred. |
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| 479 | * features - {Array(<OpenLayers.Feature.Vector>)} |
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| 480 | */ |
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| 481 | triggerGetFeatureInfo: function(request, xy, features) { |
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| 482 | this.events.triggerEvent("getfeatureinfo", { |
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| 483 | text: request.responseText, |
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| 484 | features: features, |
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| 485 | request: request, |
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| 486 | xy: xy |
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| 487 | }); |
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| 488 | |
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| 489 | // Reset the cursor. |
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| 490 | OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait"); |
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| 491 | }, |
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| 492 | |
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| 493 | /** |
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| 494 | * Method: handleResponse |
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| 495 | * Handler for the GetFeatureInfo response. |
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| 496 | * |
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| 497 | * Parameters: |
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| 498 | * xy - {<OpenLayers.Pixel>} The position on the map where the |
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| 499 | * mouse event occurred. |
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| 500 | * request - {XMLHttpRequest} The request object. |
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| 501 | */ |
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| 502 | handleResponse: function(xy, request) { |
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| 503 | |
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| 504 | var doc = request.responseXML; |
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| 505 | if(!doc || !doc.documentElement) { |
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| 506 | doc = request.responseText; |
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| 507 | } |
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| 508 | var features = this.format.read(doc); |
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| 509 | if (this.drillDown === false) { |
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| 510 | this.triggerGetFeatureInfo(request, xy, features); |
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| 511 | } else { |
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| 512 | this._requestCount++; |
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| 513 | this._features = (this._features || []).concat(features); |
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| 514 | if (this._requestCount === this._numRequests) { |
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| 515 | this.triggerGetFeatureInfo(request, xy, this._features.concat()); |
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| 516 | delete this._features; |
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| 517 | delete this._requestCount; |
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| 518 | delete this._numRequests; |
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| 519 | } |
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| 520 | } |
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| 521 | }, |
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| 522 | |
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| 523 | CLASS_NAME: "OpenLayers.Control.WMSGetFeatureInfo" |
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| 524 | }); |
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