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In some situations, your RJS file can be just a few lines of code, or it could even be a single call, and it might seem like overkill to create and manage a new template with such a small amount of code. In those cases, you can implement RJS responses directly from the controller action using render :update. If we were so inclined, we could do away with the save_event.rjs template and implement the entire response in the save_event action. Here s how it would look:

In the previous example, you allowed the DataGrid to automatically generate columns based on the data to which it was bound. This is not a new concept it has been around in data grid components since the initial release of ASP.NET. But what if you want to have some additional control over the columns that are created in your DataGrid What if you want to add a column that contains some more complex information, such as an image You can do this by first setting the AutoGenerateColumns property on the grid to false. Then you need to generate the columns manually. Columns are defined in a DataGrid using the Columns collection. The following is an example of setting the Columns collection in XAML. Notice that it sets the AutogenerateColumns property to False. If you neglect to do this, you will get all of the autogenerated columns in addition to the columns you define within the Columns collection.

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Database-level events are not the only events that can be trapped within a trigger; server events can also be caught. Table 13-3 shows the DDL statements that have the scope of the whole server. Many of these you may not come across for a while, if at all, so we will concentrate on database-scoped events.

def save_event current_user.events.create(params[:event]) count_events render :update do |page| # Replace the count div page.replace_html 'count', :partial => 'events_count' page.visual_effect :highlight, 'count' # Clean up the UI

Table 13-3. DDL Server Scoped Statements You Can Listen For CREATE_LOGIN CREATE_HTTP_ENDPOINT DENY_SERVER_ACCESS ALTER_CERT ALTER_LOGIN DROP_HTTP_ENDPOINT REVOKE_SERVER_ACCESS DROP_CERT DROP_LOGIN GRANT_SERVER_ACCESS CREATE_CERT

page['event_title'].value = '' page['event_location'].value = '' page['event_title'].focus # Hide the indicator image page['indicator_form'].hide end end

As you ve seen, the Canvas panel is a simple layout control. It can be used very effectively in a fixed layout. However, in most cases, you will want to use a static layout for your applications. The StackPanel control provides a more fluid layout control.

A DDL trigger can also accept every event that occurs within the database and, within the T-SQL code, decide what to do with each event, from ignoring upward. However, catching every event results in an overhead on every action.

Deciding whether to put RJS code in its own file or on the controller might come down to personal preference, so try both approaches and stick with the one you like best. For RJS responses that are long, we recommend that you create an RJS template, to help keep your controller clean of view code and easy to read. For RJS responses that are one or two lines long, keeping the code in the controller may save you some time when coding. For more information about RJS templates, including usage examples, be sure to check out the Rails API documentation at http://api.rubyonrails.org/classes/ ActionView/Helpers/PrototypeHelper/JavaScriptGenerator/GeneratorMethods.html.

It is not possible to have a trigger that fires on both server and database events; it s one or the other.

The StackPanel provides developers with a quick layout option for positioning objects. The StackPanel control allows you to position Silverlight objects in more of a flow layout, stacking objects either horizontally or vertically. Figure 3-7 shows the basic concept of this layout control.

Summary

The syntax for a DDL trigger is very similar to that for a DML trigger:

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