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In this section, you ll learn the difference between errors and flash messages, and you ll discover how to customize the messages. If you try to submit a user form without entering a username, you will see error messages in action. When you violate a domain object s constraints, the red text that you see is an example of an error message. Figure 5-11 shows an example.

When a user clicks a button, chooses an item in a list box, or uses the cursor keys, the application must be able to respond to these events. These events are input events and are actually forwarded to Silverlight by the browser hosting the Silverlight plug-in. Other events, such as the application events just shown, are defined within Silverlight itself. Keyboard and mouse events are routed events. These events bubble up the tree of objects starting at the first control to receive the input event. Let s create a simple example and hook up MouseLeftButton down events.

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This screen shows the default error messages. As you saw previously in Listing 5-20, you can customize the message using the messages.properties file located in the grails-app/ i18n directory. To get a better understanding of how this works, you need to switch the views and the controller from dynamic scaffolding to static scaffolding. Grails generates dynamic scaffolding on the fly when the application starts. If Grails can generate the code at runtime, it makes sense that it can generate the code at development time so you can see it. The generated code is called static scaffolding. Take a precaution against losing the existing implementation of the UserController by making a backup copy. You can create the views for the User domain object by executing the command grails generate-views User. The command uses Grails templates to generate four new GSP pages in the grails-app/views/user directory: create.gsp, edit.gsp, list.gsp, and show.gsp. Now you need to create static scaffolding for the controller. You can create the controller for the User domain object by executing the command grails generate-controller User. Grails will detect that you already have an implementation of the controller and ask for permission to overwrite it. Give it permission; this is why you made a backup copy. After the UserController is generated, you need to copy the login, handleLogin, and logout actions from the backup to the newly generated controller. Listing 5-22 contains the contents of the save action.

ext files are a mainstay of Unix operating systems. From the password file, /etc/passwd, to server configuration files, such as httpd.conf (exact location varies, depending on the system), a computer s behavior is controlled by text files. But what is a text file E-mail and Usenet messages are text files; HTML web pages are text files; shell scripts are text files; log files are text files. Text files are human-readable and can be edited with any text editor. They can, of course, be viewed, manipulated, and edited with shell scripts. A Unix operating system does not distinguish between text files and binary files. All files are binary files text files are just a subset. According to the Single UNIX Specification (SUS) glossary, a text file contains characters organised into one or more lines. The lines must not contain NUL characters and none can exceed {LINE_MAX} bytes in length, including the newline character 1 NUL is ASCII 0, a byte in which all bits are set to 0, and LINE_MAX, the maximum number of characters permissible on a line, is system-dependent; it is 2,048 on the Linux and FreeBSD systems I use. Many of the text files on a Unix system use a well-defined format. Some of these are covered in other sections of the book, as are scripts to convert text to other formats. This chapter presents scripts that deal with arbitrarily formatted (or unformatted) text files.

01 02 03 04 05 06 07 08 09 10 11 def save = { def user = new User() user.properties = params if(user.save()) { flash.message = "User ${user.id} created." redirect(action:show,id:user.id) } else { render(view:'create',model:[user:user]) } }

Note If you have any experience with WPF, you should be aware that there is a vital difference between

1. http://www.opengroup.org/onlinepubs/007908799/xbd/glossary.html#tag_004_000_306

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