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The next two buttons help you analyze the T-SQL query for optimization. We won t cover optimization within this book.

"count", $('indicator_form').show(), $('indicator_form').hide(), { :controller => 'ajax', :action => "save_event" }) do %>

Rather than typing T-SQL code by hand, we can use a type of wizard that allows a query to be built up by selecting tables and columns via check boxes and so on. Pressing the button shown in the following image brings up this wizard, known as the Query Design Editor, which you will see in action in 9.

<p>Title<br/><%= text_field 'event', 'title' %></p> <p>Location<br/><%= text_field 'event', 'location' %></p> <%= submit_tag 'Save' %> <%= image_tag 'indicator.gif', :id => 'indicator_form', :style => 'display:none' %> <% end %>

The following button allows you to work with code templates. Templates feature the basics of commands or actions. They have options that act as default values. Pressing this button brings up a dialog box to change the values in each of a template s parameters.

Now that you have the XAML and the class defined, you can wire them up. To do this, first create an event handler for the Loaded event of the page, as follows:

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This is all well and good, but you can see how it could get pretty unwieldy if we needed to do more than a few things on :loading and :complete What if, in addition to showing and hiding the progress indicator, we wanted to highlight the updated count element, reset the form elements, and place the cursor in the Title field Sure, we could probably pull it off, but it wouldn t look very pretty RJS to the rescue Just like ERb templates (with the rhtml extension), RJS templates correspond to controller actions Our form submits to the save_event action, so we ll create a template to respond to that action, called save_eventrjs, and save it in app/views/ajax As expected, it will be executed in response to the save_event action.

The next set of buttons deals with the query. The first two place details on how your code was executed and statistics about the code within the output. The third button runs your code as if it were run by SQLCMD, which is a command-line utility for executing SQL batches. These options are not covered within this book.

In RJS templates, you have access to a special variable named page, which represents the web page on which you ll be acting The responsibility of the RJS file is to manipulate page elements after an Ajax request, as we did with the :update parameter The RJS template has more flexibility, as you can access any element on the page, instead of being constrained by the element indicated by the :update parameter Let s get down to coding the template now We ll start by outlining what we want the response to be, and then we ll implement the necessary RJS After submitting the form, we want to do the following things on the rendered page: Update the count element Highlight the count element to show that a change has taken place Clear the values from the title and location form elements.

The first two buttons shown in the following image affect how the results from the query are displayed, either as text or as a grid, respectively. The third button sends results to a file.

public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { } } 5. When the page is loaded, you want to call GetData() from the GridData class and bind that to the DataGrid s ItemsSource property, as follows: public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { this.grid.ItemsSource = GridData.GetData(); }

Place the cursor inside the title element so it s ready for the next input Hide the status indicator The RJS required to implement these actions is shown in Listing 7-20..

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