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The first line in our output, '1: Connect', is logged after we call the open method. The open method changes the state of the XHR from 0 to 1, which dispatches the readystatechange event. The second line is logged after we call send, which changes the state from 1 to 2, triggering another dispatch of the readystatechange event. As the browser starts receiving data from the server, it changes the state of the XHR to 3, dispatching a third readystatechange event that logs our third line. Finally, the last readystatechange event is dispatched when the browser finishes downloading the whole response from the server, thereby logging our fourth and last line. The last phase is perhaps the most important of these four phases, because it s only when we have all of the response data that we can start parsing it for our purposes. This means that until the readyState of our XHR object is 4, we can t access the complete data from our response. With this in mind, we can now create a proper event handler for our async request: var xhr = new XMLHttpRequest(); xhr.open('GET', 'http://foo.com/index.html', true); // attach handler xhr.onreadystatechange = function(){ if (xhr.readyState == 4){ console.log(xhr.responseText); } }; xhr.setRequestHeader('Accept', 'text/html'); xhr.send(); Here we changed our readystatechange handler by adding an if statement that checks whether the readyState property is equal to 4. If the value of this property is anything other than 4, the data isn t

The standard acknowledges that the design workspace has to be identified, so that appropriate resources may be organized. It practice, not all of the functionality of an enterprise may be included within an enterprise context.

The standard acknowledges the use of an enterprise design framework where there are many structures that need to be managed as a cohesive composite.

Figure 5-11. CSDL Association node The ComplexType node seen in Figure 5-12 contains a Property child node for defining properties of ComplexTypes. As the name infers, this node is used for defining Complex custom types in your model.

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ready yet and we won t be able to read the full response body. But if the value is equal to 4, our response has been completely downloaded, and we can begin using it or parsing it for our needs. One thing we also have to factor in is the simple guard we included to check for failed requests. Remember that we checked the value of the response s status code in the previous section to determine whether the response was successful or not. We should also add that into our new event handler: var xhr = new XMLHttpRequest(); xhr.open('GET', 'http://foo.com/index.html', true); // attach handler xhr.onreadystatechange = function(){ if (xhr.readyState == 4){ if (xhr.status >= 200 && xhr.status < 300){ console.log(xhr.responseText); } else { console.log('Unsuccessful Request.'); } } }; xhr.setRequestHeader('Accept', 'text/html'); xhr.send(); Finally, we can also add a timeout that will automatically cancel our request if it takes too long: var xhr = new XMLHttpRequest(); xhr.open('GET', 'http://foo.com/index.html', true); // attach handler xhr.onreadystatechange = function(){ if (xhr.readyState == 4){ if (xhr.status >= 200 && xhr.status < 300){ console.log(xhr.responseText); } else { console.log('Unsuccessful Request.'); } } }; xhr.setRequestHeader('Accept', 'text/html'); xhr.send(); // timeout setTimeout(function(){ xhr.abort(); }, 5000); And with that, we now have our complete asynchronous XHR code.

The standard acknowledges that the design, development, and maintenance of software is a specialized skill with its own set of dynamics. Encapsulating domain software into a layer is an efficient and convenient way to manage the special needs of application development.

Now that we ve looked at the native XMLHttpRequest implementation, you might have noticed a few things: The initialization method open has to be called separately from the constructor function, which doesn t fit with the normal JavaScript (or MooTools) style. Native XHRs dispatch only a single event type in most browsers, which means that we have to cram all our code into a single event handler for both successful and failed requests. Timeouts aren t natively implemented, so we need to add separate code to handle this for us. We don t have the flexibility to handle different response types, and we have to parse the responses ourselves.

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