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where the entire form is resubmitted as part of the new request. There s simply no built-in way to identify an instance of a form, so something different will have to be used. One very common way of identifying complex structures like this is to create a hash based on the data. While hashes aren t guaranteed to be unique, they re close enough for most purposes, and there are some things that can be included along with a hash to get better odds of uniqueness. In the case of a form, this hash can be taken from the complete collection of field data, so that a change in any name or value would result in a change in the hash that data would produce. Another piece of information that can be stored alongside the hash is the import path to the form, which allows for differentiation among multiple sets of data, if there are multiple forms with the same collection of fields. Now that there are a few pieces of information to store, consider how they should relate to each other. There are essentially two levels here: the form and its values. These could be taken as two separate models, relating multiple values to a single form by way of a standard foreign key relationship. The form side would contain the form s path as well as the hash of all its values, while the value side would contain the names and values of each field, as well as a reference back to the form it belongs with. The module of the application looks like this:

Figure 11-9. After floating label elements, some parts of our form seem to spill out of their containing fieldset. Whoops! That s not right. Some of the form controls are not contained within their associated fieldset. The reason for this is our decision to float the label elements to the left. Floating an element takes it out of the normal flow of the document, causing the fieldset elements to not expand and contain them. One way to work around this behavior is to have an element at the end of the fieldset clear the floats. Doing so will cause the parent fieldset element to stretch vertically and contain the form controls. We ve strategically placed br elements at the end of each fieldset for exactly this reason. Ideally, you d place the clear on an element that already exists, but since no such element exists, the br element is a semantically sound one to add. br { clear: }

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To load external JavaScript, use the $.getScript() function. This accepts a URL to which the request is sent and an optional callback (which is generally not needed, as the script will execute automatically on a successful load). Create a new file called script.php in the testing folder, and insert the following: alert("This script was loaded by AJAX!"); Now, load this script by executing the following code in the console: $.getScript("script.php"); Upon execution, the alert fires.

This simple structure is now capable of storing any amount of data for any form. It wouldn t be very efficient if the application needed to make complex queries on the form s data, but since it s just being used to save and restore the contents of a form all at once, it ll work quite well. Now that there are models in place to contain the form s data, there needs to be a way to actually store that data for later retrieval. Thankfully, forms are just standard Python classes, so it s easy enough to just write an extra method that handles this task directly. Then, when the time comes to write a specific form that needs this capability, it can simply subclass the following form, rather than the usual . This is placed in a new module in our application.

both;

.load()

Note the liberal use of here. If an instance of a form already exists with exactly the same values, there s no sense saving the whole thing twice. Instead, it simply relies on the fact that the previous copy will be functionally identical, so it ll work for both.

This code works like a charm, as you can see in Figure 11-10.

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