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interface XMLHttpRequest { function onreadystatechange; readonly unsigned short readyState; void open(string method, string url); void open(string method, string url, bool async); void open(string method, string url, bool async, string user); void open(string method, string url, bool async, string user, string pswd); void setRequestHeader(string header, string value); void send(string data); void send(Document data); void abort(); string getAllResponseHeaders(); string getResponseHeader(string header); string responseText; Document responseXML; unsigned short status; string statusText; };

7:

Using the component is a two-step operation. First, you open a channel to the URL and specify the method (GET, POST, or other) to use and specify whether you want the request to execute asynchronously. Next, you set any required header and send the request. If the request is a POST, you pass to the send method the body of the request. The send method returns immediately in the case of an asynchronous operation. You write an onreadystatechange function to check the status of the current operation and, using that function, figure out when it is done. The following code shows how to carry on a POST request using the XMLHttpRequest object:

You just have to load all the characters to be trimmed in an array of Chars and pass the array to the TrimStart function (and you can use the same pattern with the TrimEnd and Trim functions):

var xmlRequest, e; try { xmlRequest = new XMLHttpRequest(); } catch(e) { try { xmlRequest = new ActiveXObject("Microsoft.XMLHTTP");

Tip It s a good idea to use a view rather than a table when extracting data for reporting purposes. If business rules change for the reports, you can make the necessary updates to the view rather than modify each report using a the table avoiding a maintenance nightmare. Another way to manage future changes to the report is to use a stored procedure, which you ll learn how to do in 7.

Dim cArr() As Char = { c, ControlChars.Tab } s = s.TrimStart(cArr)

} catch(e) { } } // Prepare for a synchronous POST request var body = null; // An empty request body this time... xmlRequest.open("POST", pageUrl, false); xmlRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xmlRequest.send(body);

In a synchronous call, the send method returns when the response has been fully downloaded and parsed by the object. You can access it as a plain string using the responseText property. If the response is an XML stream, you can have it exposed as an XML DOM object using the responseXml property. Important If you re going to use any Ajax-enabled framework for building Web applications,

You can even create the Char array on the fly:

you ll hardly hear anything about the XMLHttpRequest object, much less use it directly in your own code. An Ajax framework completely encapsulates this object and shields page authors and application designers from it. You don t need to know about XMLHttpRequest to write great Ajax applications, no matter how complex and sophisticated they are. However, knowing the fundamentals of XMLHttpRequest can lead you to a better and more thorough understanding of the platform and to more effective diagnoses of problems.

s = s.TrimStart(New Char() { c, ControlChars.Tab})

Ajax applications require you to write a lot of JavaScript code. Most of the time, you are called upon to write simple UI-driven code that refreshes the user interface following the state of the application and maps pieces of downloaded data to UI elements. If all you need to write is a few event handlers, any approach does work. When the quantity of code grows beyond a certain threshold, however, you need to lay out your client code using abstractions not unlike those you might use in a classic programming language functions and objects. I won t stray too far from the truth if I state that JavaScript is such a flexible language that it can be used to write code that follows two radically different programming paradigms functional programming and object-oriented programming (OOP). Which one should you choose and when