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| Viewing file: Select action/file-type: /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for
* full list of contributors). 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)) {
if(typeof config.proxy == "function") {
url = config.proxy(url);
} else {
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]);
}
var events = this.events;
// we want to execute runCallbacks with "this" as the
// execution scope
var self = this;
request.onreadystatechange = function() {
if(request.readyState == OpenLayers.Request.XMLHttpRequest.DONE) {
var proceed = events.triggerEvent(
"complete",
{request: request, config: config, requestUrl: url}
);
if(proceed !== false) {
self.runCallbacks(
{request: request, config: config, requestUrl: url}
);
}
}
};
// 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(){
if (request._aborted !== true) {
request.send(config.data);
}
}, 0);
}
return request;
},
/**
* Method: runCallbacks
* Calls the complete, success and failure callbacks. Application
* can listen to the "complete" event, have the listener
* display a confirm window and always return false, and
* execute OpenLayers.Request.runCallbacks if the user
* hits "yes" in the confirm window.
*
* Parameters:
* options - {Object} Hash containing request, config and requestUrl keys
*/
runCallbacks: function(options) {
var request = options.request;
var config = options.config;
// 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;
}
complete(request);
if (!request.status || (request.status >= 200 && request.status < 300)) {
this.events.triggerEvent("success", options);
if(success) {
success(request);
}
}
if(request.status && (request.status < 200 || request.status >= 300)) {
this.events.triggerEvent("failure", options);
if(failure) {
failure(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);
}
};
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