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You want to use Ajax to solve some of the problems associated with submitting forms the traditional way with POST.
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Theory
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When implementing a workflow such as buying an airplane ticket, you use HTML forms. An HTML form has a number of UI elements, such as a text box, a list box, or a combo box, that users can use to enter information. When they re content with the information entered, they press a button to submit the data to the server. The server receives the data and generates some kind of result. Figures 8-1 and 8-2 illustrate the process.
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CHAPTER 8 8-1. DON T SUBMIT YOUR FORMS AJAX THEM
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Figure 8-1. Filling in the contents of an HTML form
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Figure 8-2. Server-side generated results based on the data sent by the HTML form Figure 8-1 features a single text box and a single button. The text box is used to enter some data that will be sent to the server. The button is used to HTTP POST the form to the server. In previous recipes, an HTTP POST was used when data was sent to the server. None of the examples used the HTTP POST in the context of an HTML form. When an HTTP POST is used in the context of an HTML form, the server processes the form and generates some data that then becomes the next HTML page, as Figure 8-2 shows. From a content-processing perspective, the difference in processing between an HTTP GET and POST is dramatic. In Figure 8-1, the content was retrieved using an HTTP GET, where the server does not expect any state from the client. The client could call the URL multiple times, and the content would be generated each time. An HTTP POST is different in that the client has to send state. Based on that state, the server does some processing and generates some content, as illustrated in Figure 8-2. The state that the client has to send is not optional. A browser helps the client by caching the state sent previously, and when requested, sends the state again with an appropriate dialog box, as illustrated in Figure 8-3. The problem with sending the state again is that you might execute the process to buy a plane ticket again, thus buying two.
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CHAPTER 8 8-1. DON T SUBMIT YOUR FORMS AJAX THEM
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Figure 8-3. Message box indicating a reposting of the data In Figure 8-3, the message box indicates that the action will cause the data to be sent to the server as a POST. A warning is necessary, because the data has already been sent previously, and if you were purchasing a ticket, then you might end up purchasing another ticket unintentionally. In Figure 8-3, you would obviously press Cancel, but doing so would cause the page to not be generated, resulting in a blank screen or a screen with an error. Not being able to navigate to some previous page is wrong, because most traditional clients allow you to navigate to previous screens without causing an automatic posting to the server. Imagine a situation in which you re buying a plane ticket and you want to experiment with different times and airports. To search for a particular ticket, you would use an HTTP POST. Each tweaking of the parameters could cause the dialog box of Figure 8-3 to appear. Yet you would probably reply that in fact, this is an incorrect assertion, as the dialog box rarely appears. The reason why the dialog box rarely appears is because you re guided and told which buttons you can and cannot press. To go back a step in the workflow process, you would not press the Browser Back button. Next time, look closely at a typical HTML-based workflow, and you ll notice how information is repeated on multiple screens and how the workflow guides the user. It is very clever, and users are typically not aware of being manipulated into thinking in certain directions.
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