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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 | /* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD * license. See http://svn.openlayers.org/trunk/openlayers/license.txt for the * full text of the license. */ /** * @requires OpenLayers/Events.js */ /** * Namespace: OpenLayers.Request * The OpenLayers.Request namespace contains convenience methods for working * with XMLHttpRequests. These methods work with a cross-browser * W3C compliant <OpenLayers.Request.XMLHttpRequest> class. */ OpenLayers.Request = { /** * Constant: DEFAULT_CONFIG * {Object} Default configuration for all requests. */ DEFAULT_CONFIG: { method: "GET", url: window.location.href, async: true, user: undefined, password: undefined, params: null, proxy: OpenLayers.ProxyHost, headers: {}, data: null, callback: function() {}, success: null, failure: null, scope: null }, /** * APIProperty: events * {<OpenLayers.Events>} An events object that handles all * events on the {<OpenLayers.Request>} object. * * All event listeners will receive an event object with three properties: * request - {<OpenLayers.Request.XMLHttpRequest>} The request object. * config - {Object} The config object sent to the specific request method. * requestUrl - {String} The request url. * * Supported event types: * complete - Triggered when we have a response from the request, if a * listener returns false, no further response processing will take * place. * success - Triggered when the HTTP response has a success code (200-299). * failure - Triggered when the HTTP response does not have a success code. */ events: new OpenLayers.Events(this, null, ["complete", "success", "failure"]), /** * APIMethod: issue * Create a new XMLHttpRequest object, open it, set any headers, bind * a callback to done state, and send any data. It is recommended that * you use one <GET>, <POST>, <PUT>, <DELETE>, <OPTIONS>, or <HEAD>. * This method is only documented to provide detail on the configuration * options available to all request methods. * * Parameters: * config - {Object} Object containing properties for configuring the * request. Allowed configuration properties are described below. * This object is modified and should not be reused. * * Allowed config properties: * method - {String} One of GET, POST, PUT, DELETE, HEAD, or * OPTIONS. Default is GET. * url - {String} URL for the request. * async - {Boolean} Open an asynchronous request. Default is true. * user - {String} User for relevant authentication scheme. Set * to null to clear current user. * password - {String} Password for relevant authentication scheme. * Set to null to clear current password. * proxy - {String} Optional proxy. Defaults to * <OpenLayers.ProxyHost>. * params - {Object} Any key:value pairs to be appended to the * url as a query string. Assumes url doesn't already include a query * string or hash. Typically, this is only appropriate for <GET> * requests where the query string will be appended to the url. * Parameter values that are arrays will be * concatenated with a comma (note that this goes against form-encoding) * as is done with <OpenLayers.Util.getParameterString>. * headers - {Object} Object with header:value pairs to be set on * the request. * data - {String | Document} Optional data to send with the request. * Typically, this is only used with <POST> and <PUT> requests. * Make sure to provide the appropriate "Content-Type" header for your * data. For <POST> and <PUT> requests, the content type defaults to * "application-xml". If your data is a different content type, or * if you are using a different HTTP method, set the "Content-Type" * header to match your data type. * callback - {Function} Function to call when request is done. * To determine if the request failed, check request.status (200 * indicates success). * success - {Function} Optional function to call if request status is in * the 200s. This will be called in addition to callback above and * would typically only be used as an alternative. * failure - {Function} Optional function to call if request status is not * in the 200s. This will be called in addition to callback above and * would typically only be used as an alternative. * scope - {Object} If callback is a public method on some object, * set the scope to that object. * * Returns: * {XMLHttpRequest} Request object. To abort the request before a response * is received, call abort() on the request object. */ issue: function(config) { // apply default config - proxy host may have changed var defaultConfig = OpenLayers.Util.extend( this.DEFAULT_CONFIG, {proxy: OpenLayers.ProxyHost} ); config = OpenLayers.Util.applyDefaults(config, defaultConfig); // create request, open, and set headers var request = new OpenLayers.Request.XMLHttpRequest(); var url = config.url; if(config.params) { var paramString = OpenLayers.Util.getParameterString(config.params); if(paramString.length > 0) { var separator = (url.indexOf('?') > -1) ? '&' : '?'; url += separator + paramString; } } if(config.proxy && (url.indexOf("http") == 0)) { url = config.proxy + encodeURIComponent(url); } request.open( config.method, url, config.async, config.user, config.password ); for(var header in config.headers) { request.setRequestHeader(header, config.headers[header]); } // bind callbacks to readyState 4 (done) var complete = (config.scope) ? OpenLayers.Function.bind(config.callback, config.scope) : config.callback; // optional success callback var success; if(config.success) { success = (config.scope) ? OpenLayers.Function.bind(config.success, config.scope) : config.success; } // optional failure callback var failure; if(config.failure) { failure = (config.scope) ? OpenLayers.Function.bind(config.failure, config.scope) : config.failure; } var events = this.events; request.onreadystatechange = function() { if(request.readyState == OpenLayers.Request.XMLHttpRequest.DONE) { var proceed = events.triggerEvent( "complete", {request: request, config: config, requestUrl: url} ); if(proceed !== false) { complete(request); if (!request.status || (request.status >= 200 && request.status < 300)) { events.triggerEvent( "success", {request: request, config: config, requestUrl: url} ); if(success) { success(request); } } if(request.status && (request.status < 200 || request.status >= 300)) { events.triggerEvent( "failure", {request: request, config: config, requestUrl: url} ); if(failure) { failure(request); } } } } }; // send request (optionally with data) and return // call in a timeout for asynchronous requests so the return is // available before readyState == 4 for cached docs if(config.async === false) { request.send(config.data); } else { window.setTimeout(function(){ request.send(config.data); }, 0); } return request; }, /** * APIMethod: GET * Send an HTTP GET request. Additional configuration properties are * documented in the <issue> method, with the method property set * to GET. * * Parameters: * config - {Object} Object with properties for configuring the request. * See the <issue> method for documentation of allowed properties. * This object is modified and should not be reused. * * Returns: * {XMLHttpRequest} Request object. */ GET: function(config) { config = OpenLayers.Util.extend(config, {method: "GET"}); return OpenLayers.Request.issue(config); }, /** * APIMethod: POST * Send a POST request. Additional configuration properties are * documented in the <issue> method, with the method property set * to POST and "Content-Type" header set to "application/xml". * * Parameters: * config - {Object} Object with properties for configuring the request. * See the <issue> method for documentation of allowed properties. The * default "Content-Type" header will be set to "application-xml" if * none is provided. This object is modified and should not be reused. * * Returns: * {XMLHttpRequest} Request object. */ POST: function(config) { config = OpenLayers.Util.extend(config, {method: "POST"}); // set content type to application/xml if it isn't already set config.headers = config.headers ? config.headers : {}; if(!("CONTENT-TYPE" in OpenLayers.Util.upperCaseObject(config.headers))) { config.headers["Content-Type"] = "application/xml"; } return OpenLayers.Request.issue(config); }, /** * APIMethod: PUT * Send an HTTP PUT request. Additional configuration properties are * documented in the <issue> method, with the method property set * to PUT and "Content-Type" header set to "application/xml". * * Parameters: * config - {Object} Object with properties for configuring the request. * See the <issue> method for documentation of allowed properties. The * default "Content-Type" header will be set to "application-xml" if * none is provided. This object is modified and should not be reused. * * Returns: * {XMLHttpRequest} Request object. */ PUT: function(config) { config = OpenLayers.Util.extend(config, {method: "PUT"}); // set content type to application/xml if it isn't already set config.headers = config.headers ? config.headers : {}; if(!("CONTENT-TYPE" in OpenLayers.Util.upperCaseObject(config.headers))) { config.headers["Content-Type"] = "application/xml"; } return OpenLayers.Request.issue(config); }, /** * APIMethod: DELETE * Send an HTTP DELETE request. Additional configuration properties are * documented in the <issue> method, with the method property set * to DELETE. * * Parameters: * config - {Object} Object with properties for configuring the request. * See the <issue> method for documentation of allowed properties. * This object is modified and should not be reused. * * Returns: * {XMLHttpRequest} Request object. */ DELETE: function(config) { config = OpenLayers.Util.extend(config, {method: "DELETE"}); return OpenLayers.Request.issue(config); }, /** * APIMethod: HEAD * Send an HTTP HEAD request. Additional configuration properties are * documented in the <issue> method, with the method property set * to HEAD. * * Parameters: * config - {Object} Object with properties for configuring the request. * See the <issue> method for documentation of allowed properties. * This object is modified and should not be reused. * * Returns: * {XMLHttpRequest} Request object. */ HEAD: function(config) { config = OpenLayers.Util.extend(config, {method: "HEAD"}); return OpenLayers.Request.issue(config); }, /** * APIMethod: OPTIONS * Send an HTTP OPTIONS request. Additional configuration properties are * documented in the <issue> method, with the method property set * to OPTIONS. * * Parameters: * config - {Object} Object with properties for configuring the request. * See the <issue> method for documentation of allowed properties. * This object is modified and should not be reused. * * Returns: * {XMLHttpRequest} Request object. */ OPTIONS: function(config) { config = OpenLayers.Util.extend(config, {method: "OPTIONS"}); return OpenLayers.Request.issue(config); } }; |