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While the fields included with Django are suitable for most tasks, not every application fits neatly into a list of situations somebody else expected to be common. For those applications where the existing fields aren t enough, it s easy to define custom fields for forms, much like how fields for models can be created. It s even easier to create form fields than model fields, since they don t have to interact with the database. The main difference between model fields and form fields is that forms only have to deal with string input, which greatly simplifies the process. There s no need to worry about supporting multiple backends, each with its own complexities, much less all the different lookup types and relationships that add to the bulk of model fields. As mentioned, all form fields inherit from , living at . Because forms use this fact to distinguish fields from methods or other attributes, all custom fields must be part of this inheritance chain in order to work properly. Thankfully, provides a number of useful features that can make it much easier to implement a specific type of field. Like many other classes, fields define a few attributes and methods to control specific behaviors, such as what widget to use and what error messages to display, as well as how to validate and clean incoming values. Any or all of them can be overridden to customize the functionality of a specific field.

Summary

There are a whole slew of browser events triggered by the user, and jQuery provides several methods to handle them easily.

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Perhaps the most important behavior of a field is how it validates and cleans user input. After all, fields exist as a bridge between dangerous incoming data and a safe Python environment, so it s essential that this translation be done properly. The field s method is primarily responsible for this, both for raising exceptions for improper data and for returning a cleaned value if the input is valid. The method s signature is simply , accepting the field object itself and also the incoming value. Then, if the value is deemed inappropriate according to the field s requirements, it should raise an instance of with a message indicating what went wrong. Otherwise, it should convert the value to whatever native Python data type is appropriate for the field and return it. In addition to making sure error messages are as descriptive as possible, it s important to keep maintenance of error messages simple, while still allowing individual instances to override them. Django facilitates this by way of a pair of attributes called and , as well as an argument called . This may seem like a tangled nest of values, but the way it works is rather simple. A field class defines its standard error messages in a class-level attribute called . This is a dictionary mapping an easily-identifiable key to the actual error message string. Since fields will often inherit from other fields, which may define their own

CSS allows you to present data tables in virtually limitless ways. Although the examples here are relatively simple, they illustrate the kind of things you can do and your creativity can take it from here. A real key to creating tables that are useful, readable, and interesting to look at is the (X)HTML markup you use to provide those additional styling hooks. By taking advantage of some of the newer and more semantic elements, you can create tables that both look great and work effectively for users visiting your site with assistive technology and other alternate devices. Now that you re familiar with styling tabular data, let s move on to laying out another common web page component: forms.

The available events are blur, focus, focusin, focusout, load, resize, scroll, unload, click, dblclick, mousedown, mouseup, mousemove, mouseover, mouseout, mouseenter, mouseleave, change, select, submit, keydown, keypress, keyup, and error.

attributes, Django automatically combines them all into one dictionary when the field is instantiated. In addition to using , Django allows individual field instances to override some of these messages by way of the argument. Any values in that dictionary will replace the default values for the keys specified, but only for that particular field instance. All other instances of the field will remain unaffected. That means that error messages can come from three separate places: the field class itself, the field s parent classes and the arguments used to instantiate the field. When looking to raise an exception as part of the method, there needs to be a simple way to retrieve a specific error message, regardless of where it was actually defined. For this, Django populates an attribute of every field instance, which contains all the messages that were defined in all three ways. This way, can simply look up a key in and use its value as the argument to .

sing the power of CSS, forms can be styled in many interesting and creative ways to enhance not only their aesthetics, but also their usability. However, forms are also the single area where default styling and differences in CSS support are the most inconsistent across browsers. There are two main components to forms and CSS: laying out entire forms and styling individual form widgets. Let s start with the latter.

.bind() and .unbind()

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