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Listing 832 WebRequest Version of the AdvancedLookup Web Service Call
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// Call WebRequest CallServiceWithWebRequest(); // WebRequest Wrapper function CallServiceWithWebRequest() { var searchCriteria = new ProductLookupDemoSearchCriteria(); searchCriteriaProductNumber = "200"; searchCriteriaDescription = "Black XBox Controller"; searchCriteriaPrice = 50; var searchCriteriaJSON = SysSerializationJavaScriptSerializerserialize( searchCriteria); var request = new SysNetWebRequest(); requestget_headers()['Content-Type'] = 'application/json; charset=utf-8'; requestset_url("Productsvc/AdvancedLookup"); requestset_body("{\"criteria\":" + searchCriteriaJSON + "}"); requestset_httpVerb("POST"); requestadd_completed(onCompleted); requestinvoke(); } // Completion Handler function onCompleted(executor, eventArgs) { if (executorget_responseAvailable()) { var statusCode = executorget_statusCode(); var result = null; try { result = executorget_object(); } catch (ex) {} var error = executorgetResponseHeader("jsonerror"); var errorObj = (error === "true"); if (errorObj) { //display error var errorMessage = Stringformat("An error occurred with a message of {0} with a stact trace of {1} and an execption type of {2}",resultMessage, resultStackTrace, resultExceptionType); alert(errorMessage); } if (((statusCode < 200) || (statusCode >= 300)) || errorObj)
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{ var error; if (result && errorObj) { //display error var errorMessage = Stringformat("An error of type {0} occurred with a message of {1}",resultget_exceptionType(), resultget_message()); alert(errorMessage); } else { //display error alert(executorget_responseData()); } } else { //update the UI $get("productDescription")value = resultdDescription; $get("productPrice")value = resultdPrice; } } else { var errorMessage; if (executorget_timedOut()) { //display error errorMessage = "Request timed out"; } else if(executorget_aborted()) { errorMessage = "Request was aborted"; } else { //display error errorMessage = "Error occurred no result returned"; } } }
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Web Request Core The web request core components make up the underlying plumbing that supports the asynchronous communication model in the Microsoft AJAX
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8: A SPNET AJA X Communication Archite cture
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Library The components provide services such as abstracting the interaction with the XMLHttpExecutor, providing low-level network support for calling web services, and selecting the XMLHttp object for a speci c browser
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WebRequestManager
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The SysNetWebRequestManager class provides an abstraction above the low-level SysNetWebRequestExecutor-based class that performs the actual interaction with the network stack In a typical case, this class is used by the WebRequest class in its invoke method to call the SysNet xmlhttpexecutor class to process the request In this scenario, the executor calls the web service and on completion calls the registered completion handler in the WebRequest class to process the response The real work of processing the request is done by the executor and the WebRequest object, with the WebRequestManager acting as a broker between these two classes
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The SysNetXMLHttpExecutor class is the default executor in the Microsoft AJAX Library and provides access to the browser s underlying XMLHttp object This class is responsible for composing the raw HTTP request and calling the proper XMLHttp object to send the request to the server The class comes with properties that provide all kinds of information, including whether a response is available, the response data, the JSON representation of the response, and whether it timed out (see Table 810) The class also comes with methods that support an asynchronous calling model, providing the ability to execute a request by calling the executeRequest method and then aborting the request if needed by calling the abort method (see Table 811) As the request is processing, the started and aborted properties can be used to determine processing status
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Table 810 XMLHttpExecutor Class Properties Property aborted Description
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Returns a value that indicates whether the executor was aborted request returned without being aborted or timing out
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responseAvailable Returns a value that indicates whether the network
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Property responseData started
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Description
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Gets the text representation of the response body Returns a value that indicates whether the executor has forwarded the request to the browser s XMLHTTP object Gets the status code of the browser s XMLHTTP object Gets the status text from the browser s XMLHTTP object Returns a value that indicates whether the executor timed out Gets the JSON-evaluated object from the response Returns an XMLDOM object that contains the XML response from the browser s XMLHTTP object
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statusCode statusText timedOut
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object xml
Table 811 XMLHttpExecutor Class Methods Method abort Description
Stops the pending network request issued by the executor Executes a network request as speci ed in the associated WebRequest instance