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Nothing is more frustrating than spending hours trying to fix a problem only to discover that it was a minor mistake that you made and that you could have easily avoided. Luckily for you (and the rest of us), the W3C maintains two online tools that can help check your markup (http://validator.w3.org/) and styles (http://jigsaw.w3.org/css-validator/). Validating helps you eliminate a lot of human errors from your code: unclosed elements, improperly formed tags and attributes, incorrect properties/values, and more can be quickly located and corrected with the help of the validators. And by running your page through the validators as you fix the problems they report, it s easy to tell when you still have errors (Figure 14-6) and when you ve caught them all (Figure 14-7).

Similarly, gets fired as part of the model instantiation process, but at the end instead of the beginning, once all the arguments have been mapped to the appropriate attributes based on the fields that were defined on the model. Therefore, as the name implies, the object is completely initialized at this point. It would make sense, then, that when fires, it gets passed the fully configured model instance as well as the standard , which is the model class. The new object is passed in as the argument to the listener, which can then do with it whatever is necessary, according to the application.

invoked is if the user has JavaScript disabled. In that case, the modal windows would not function, and the user would be brought to this form. In situations where JavaScript is enabled, the server-side acts as a double-check and an additional security measure against mischievous users.

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Figure 14-6. After we validate markup (left) and styles (right), we see Microsoft.com has some problems (though there are only two errors, so be gentle).

When a model instance is being committed to the database, Django provides two ways to hook into that process, both at the beginning and at the end The primary difference, therefore, between the two is that is called before the object was committed to the database, while is called afterward This simple distinction can be very important, depending on the needs of the application When triggered by , a listener receives the model class as , and also the instance of the model as This allows the listener to get access to and even modify the instance that s about to be saved, before it hits the database This can be a useful way to provide or override default arguments for models provided by third-party applications On the other hand, is called after the save has been performed, and the instance has been committed to the database.

After this form is submitted, the app will simply output the error message and die (see Figure 9-23). The calendar application is designed for users with JavaScript enabled; you use this approach to prevent the app from displaying errors.

Figure 14-7. The no-hack layout from 6 is strictly valid, baby!

This is a useful step in two ways, because it not only ensures that the data is in fact present in the database, which is necessary when dealing with related models, but it also occurs after Django has made the decision about whether to insert a new record into the database or update an existing record In addition to the and arguments that work the same way as in , listeners for can receive another argument The argument is a Boolean indicating whether or not the instance had to be created from scratch A value of means it was newly inserted into the database, while means an existing record was updated When using the signal to track database changes, this is an important distinction, and can be used to determine the behavior of other applications To see this in action, see the history example in 11 of this book.

For most users, JavaScript will be enabled. It s far more convenient as a user to get instant feedback on the form, so you will add new jQuery functionality to validate date strings on the client side.

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