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To be sure, Ajax is a large topic. Entire books and conferences are devoted to this subset of technology alone, so it goes without saying that we ve only scratched the surface here. Still, in short order, you ve learned the basics about implementing Ajax in your Rails applications, and you know where to go when you need to dig deeper. We started by introducing the Prototype library and highlighting a few of its finer points. These include its various shortcuts for accessing elements and input fields, among other features. We also showed you how to include all the necessary JavaScript libraries, including your own application-specific JavaScript functions (application.js) using javascript_include_tag :defaults. You learned how to make remote Ajax calls using link_to_remote, and how to post forms remotely using form_remote_tag. We also covered polling the page for changes using observe_field and observe_form. We introduced the script.aculo.us library and showed you how it integrates with Rails to make implementing seemingly complex features, like auto-complete and in-place editing, a snap. Finally, you learned about RJS templates and how they enable you to harness the power of Ruby to do your JavaScript bidding, be it from templates or from the controller. At this stage, you have a solid grasp of the Action Pack side of web development with Rails. Next, we ll look at how you can conquer another common component of web application development: sending mail.

CREATE TRIGGER trigger_name ON {ALL SERVER|DATABASE} [WITH ENCRYPTION] { {{FOR |AFTER } {event_type,...} AS sql_statements}} The main options that are different are as follows: ALL SERVER|DATABASE: The trigger fires either for the server or the database you are attached to when creating the trigger. Event_type: This is a comma-separated list from either the database or server list of DDL actions that can be trapped.

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To better understand the StackPanel control, let s run through an exercise. 1. In Visual Studio 2010, create a new Silverlight application named Ch3_StackPanel and allow Visual Studio to create a Web Site project to host the application. When the project is created you should be looking at the MainPage.xaml file. If you do not see the XAML source, switch so that you can edit the XAML. Within the main Grid element, add a StackPanel control and also three buttons with the labels Button 1, Button 2, and Button 3. Give all three buttons a width of 100 and a height of 30. The following XAML adds the StackPanel control and buttons (the new code is highlighted in bold in all the exercises):

t s a rare web application that doesn t need to send mail from time to time. For example, you may want to send messages to welcome users who sign up to your site, relay passwords, or confirm orders placed with an online store. Rails ships with a library called Action Mailer, which provides developers with an easy-to-use yet powerful tool to handle email. In this chapter, we ll explain how Action Mailer works and how to use it in your applications. We ll start by describing how to configure it, and then we ll show you a few examples of how to send email in various formats. In addition to sending mail, Action Mailer is also capable of receiving mail, an advanced topic that we ll touch on briefly.

You can also catch events that can be grouped together. For example, all table and view events can be defined with a group, or this group can be refined down to just table events or view events. The only grouping we will look at is how to catch every database-level event.

Like Active Record and Action Pack, Action Mailer is another one of the components that make up the Rails framework. It works much like the other components of Rails: mailers are implemented as models, and mailer templates are implemented as views. Because it s integrated into the framework, it s easy to set up and use, and requires very little configuration to get going. When you send email using an email client such as Outlook or a web-based email application like Gmail or Yahoo Mail, your messages are sent via a mail server. Unlike a web server, Rails doesn t provide a built-in mail server. You ll need to tell Action Mailer where your email server is located and how to connect to it. This sounds a bit complicated, but it s really quite easy. Depending on what kind of computer you re using, you might have a mail server built in (this is true of most UNIX systems). If not, you can use the same server that you use to process your regular email. If this is the case, you can find your server information in your email client settings, as provided by your Internet service provider (ISP), or in the settings section of your web-based email application, like Gmail.

Removing a DDL trigger from the system is not like removing other objects where you simply say DROP object_type object_name. With a DDL trigger, you have to suffix this with the scope of the trigger: DROP TRIGGER trigger_name ON {DATABASE|ALL SERVER}

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