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To fix that for columns that contain numerical data, remove the comment (//) from the final line of ActionScript so that it looks like this: dggetColumnAt(0)sortOptions = ArrayNUMERIC; What about retrieving which cell has been selected The selectedItem property for DataGrid component returns the contents of the whole row you click, not just clicked cell It is possible to return the selected cell, but it requires something called CellRenderer class and more ActionScript, and frankly, it rockets way out of atmosphere that makes this book breathable the the the the.

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Label is something of an oddball in the UI components collection. Unless you re an avid programmer, we re almost certain you ll want to forego Label in favor of a text field (covered in 6). Why Practically speaking, from a designer s point of view, Label doesn t really do anything that can t be accomplished with a text field and besides, by using a text field, you ll save the 14KB that an instance of Label would have brought to the table. Labels don t really have skins, and double-clicking an instance will tell you as much. Styling works the same as for Button, but again, trust us on this one...just use a text field. If you still want to see a Label component in action, check out Label.fla in the Exercise folder.

The List component is akin to the <select> element in HTML when its optional size and multiple attributes are specified. This component is basically a ComboBox component without the drop-down aspect it s always dropped down and it allows multiple selections, as shown in Figure 11-17.

Compatibility of JavaScript amongst today s modern browsers is light years ahead of where it was even a few years ago. Combined with the increasing sophistication of JavaScript development tools and techniques, you may decide to begin using the Web browser as a development platform. Instead of merely relying on the browser to serve as the View in the Model-ViewController pattern, you may decide to implement part of the business model in JavaScript. You can use Ajax techniques to persist changes in the model to the backend server. If the model is kept on the browser, then changes to the model can be communicated to the server en masse, reducing the number of remote calls made to the server and possibly increasing performance. A simple query string consisting of name/value pairs is probably not robust enough to communicate a large number of possibly complex model changes to the server. A better solution might be to send changes to the model as XML to the server. How can you send XML to the server You can send XML to the server as part of the request body, much like the query string is sent as part of the request body during a POST request. The server can read XML from the request body and work with it from there. The following example demonstrates how you can send XML to the server during an Ajax request. Figure 3-5 shows the page, which is a simple select box in which the user selects the types of pets the user has. It s a simplistic example, but it shows how you can send XML to the server.

Figure 11-17. The List component is scrollable and optionally allows multiple selections. Like ComboBox, the List component has nested skins, so when you double-click an instance in the authoring environment, the skins become available for editing in tiers. Styling is handled the same way as described in the Button component section.

public void setAuthentication(String user,String password) { this.user = user; this.password = password; } protected abstract boolean isAuthorized(); protected abstract pointcut accessControl(); before() : accessControl() { if (!isAuthorized()) { throw new RuntimeException("Unauthorized access to: "+ thisJoinPoint.getSignature().getName()); } }

Using one or more instances of the List component in your movie will add 29KB to the SWF if no other components share the load.

The Component Parameters area in the Properties panel is relatively hefty for the List component, as shown in Figure 11-18. Most of the choices pertain to scrolling (the distance to scroll horizontally and vertically, whether scrolling should be automatic or constant, and so on). The important parameters are allowMultipleSelection and dataProvider.