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This will give us element id values like event_location_1 and event_location_2. We do the same thing when we tell the in_place_editor method which element we want it to work on:

Confusingly, when talking about bits, the first bit is known as bit 0, the second bit is known as bit 1, and the byte is made up of bits 0 through 7. Therefore, the TransactionId column is bit 0, and the Amount column is bit 4. We will use this convention from this point onward.

The in_place_editor accepts options to customize the text to show on the submit button and the cancel link. We ve set these to sensible values: Cancel and Save. Finally, we ve used the url option to specify the action to invoke when the Save button is clicked. Also notice how we ve applied an if modifier after the call to in_place_editor that checks to make sure the event is owned by the currently logged-in user. This will effectively disable in-place editing for all but the event s owner. When the Save button is clicked, the in_place_editor form will be serialized and the value in the text box sent to the server in a parameter called value. The controller action needs to process the value and return the updated value in the body of the response. To implement this, we need to create an update action on the controller to handle the request, which is what we ll add next. When implementing the update action used with the in_place_editor, we need to pay attention to a specific convention: the action should be named update_field_name, where field_name is the name of the field to be updated. Since we re updating the location field, our method will be called (you guessed it) update_location. Add the update_location action to the events controller, as shown in Listing 7-19.

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The bit flag settings are based on the column order of the table definition. To test for a bit value, you use the ampersand (&) operator to test a specific bit or multiple set of bits. Before we discuss how this works, inspect Table 13-1. A bit value increases by the power of 2 as you progress down the bit settings, as you can see.

Now uncheck the Enable Button checkbox and you will see that the ToggleButton is no longer enabled, as shown in Figure 5-7.

def update_location Event.update(params[:id], {:location => params[:value]}) render :text => params[:value] end

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This will update the event whose id matches that of params[:id] with the changed location value before rendering the entered value using render :text effectively, replacing the previous location with the newly entered value. Now that we have everything set up, it s time to enjoy the fruits of our labor and see the in-place editor in action. With the application running, reload the events listing and select an event. When you click the event location, it should change to a text field that allows you to edit and save the location right there on the page, as shown in Figure 7-8.

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The data grid type of control has been around for ages and has been the primary choice for developers who need to display large amounts of data. The DataGrid control provided by Silverlight is not just a standard data grid, however. It contains a great deal of rich user functionality that, in the past, has been present only in third-party data grid components. For example, the Silverlight DataGrid handles resizing and reordering of grid columns. Figure 5-8 shows an example of a very simple DataGrid, where the columns were automatically generated. Notice how the column titled Male is a check box. The DataGrid control has built-in intelligence to automatically show Boolean data types as check box cells.

The script.aculo.us library also includes a rich, cross-browser animation framework that makes creating fancy effects a breeze. Like the rest of script.aculo.us, the animation framework is built on top of Prototype and includes several handy prebuilt functions. Let s take a quick look at some of the effects you can create.

Another point about bits is that they work from right to left. For example, 00000010 shows bit 1 is set and therefore a value of 2.

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