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Line 3 demonstrates a powerful feature of Grails called data binding The save action is typically called from the Create view Taking a quick look at the user Create view will help you understand how the save action works The view is used to create users In the process of creating users, the view supports creating userName, firstName, and lastName using a form component When the form is submitted, userName, firstName, and lastName are put in the parameters map Line 3 sets the domain properties from the request parameters In 6, you will learn more about domain objects and properties; this is just a preview Data binding is handy and saves lots of code If you re an experienced web developer, go take a look at one of your existing applications to see how much effort it took to assign form data to domain objects.

Many operations are required on individual characters the building blocks of strings. In this section I present functions that convert to and from numeric values, that capitalize letters and that find the next character in sequence. These functions convert single characters. All work with multiple arguments, but may not be efficient when used on a large number of them. Their operations are all done on single characters, not strings. If an argument has more than one character, only the first is used.

Figure 3-9. Vertical behavior of the WrapPanel The WrapPanel exposes three new properties, as shown in Table 3-9, all of which are also dependency properties. The Orientation property controls whether child content is stacked horizontally (wrapping to the next row) or vertically (wrapping to the next column).

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As an aside, you can also use an overridden constructor to assign the values (eg, def user = new User(params)) After assigning the domain object properties, the action attempts to save the object In the process of saving the object, it is validated If the object passes validation and the save succeeds, the user is redirected to the Show view, and the usersavedmessage message is displayed If the save fails, the Create view is redisplayed, and the validation errors are displayed Line 11 demonstrates using the render method to display the Create view and pass the failed user object to the model You may be asking, Why would it pass the user back The view uses the user object to repopulate the form so that the user can correct mistakes That s great, and it saves a good deal of development effort too.

As I was putting together this chapter, someone in the comp.unix.shell newsgroup asked how to convert a number to its character representation. The ASCII character 65 is a capital A; 32 is a space; 49 is a 1. That s all very well, but how does one convert 65 to A

But how does the view know what failed in validation We ll cover this more in 6, but the short answer is that Grails adds an error collection to the domain object The view retrieves the error messages from the domain object..

Specifies the height of each item. Can be set to Auto or a qualified value using the suffix px for device independent pixels, in for inches, cm for centimeters, or pt for points. The default is pixels. Specifies the width of each item. Can be set to Auto or a qualified value using a suffix. Specifies whether child content is stacked horizontally (wrapping to the next row) or vertically (wrapping to the next column). Can be set to Horizontal or Vertical.

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