java data matrix generator s INTRODUCING CLIENT CONTROLS IN ATLAS in Java

Encoding DataMatrix in Java s INTRODUCING CLIENT CONTROLS IN ATLAS

CHAPTER 4 s INTRODUCING CLIENT CONTROLS IN ATLAS
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<button targetElement="largeButton"> <click> <invokeMethod target="panel" method="removeCssClass"> <parameters className="small"/> </invokeMethod> <invokeMethod target="panel" method="addCssClass"> <parameters className="large"/> </invokeMethod> </click> </button> The <click> node has two child elements. They are both <invokeMethod> elements, which, as you may have guessed, call a method on a control. As with setProperty, you define, using attributes, which method on which control uses which parameters. The base Control class supports methods called removeCssClass and addCssClass. These methods expect a parameter, being the name of the class you want to remove or add, respectively. To call them using the <invokeMethod> element, you can use the following Atlas Script: <invokeMethod target="panel" method="removeCssClass"> <parameters className="small"/> </invokeMethod> As you can probably derive, this specifies that the method to be called is removeCssClass; it should be called on the control referenced as panel. The parameter to be passed to the method is className= small . When clicking largeButton, the user then triggers two actions; the first is that Atlas will invoke the removeCssClass method on the panel, telling it to remove the small Css class. It will then invoke the addCssClass method on the same control and pass it the parameter large. Thus, the effect is to dynamically change the CssClass of the object at runtime. You can see this effect in Figure 4-5.
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Figure 4-5. Dynamically changing CSS at runtime
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In this chapter, you started looking at client-side controls in Atlas, investigating the common HTML controls that are available as Atlas controls and how you can use and manipulate these using JavaScript or Atlas Script. These controls make the page-level manipulation of objects easier to handle, but they go far beyond just being a scripting methodology for existing functionality. With Atlas you can add new functionality to your client-side controls using behaviors, actions, data binding, and lots of user interface features such as drag and drop. In 5, you will take what you started with in this chapter and learn in more depth about how to use Atlas Script to associate this functionality with client-side controls.
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Using Client Controls in Atlas
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he first three chapters of this book gave you an overview of Ajax and Atlas and discussed how you can use them to build web applications using this technology to restrict unnecessary postbacks and processing on your web pages, thus improving the performance and polish of your web applications. In 4 you began to look at how Atlas provides controls such as HTML text areas, anchors, input controls, and more that help you manage the entities on your web page. The controls framework that Atlas layers on top of HTML standards allows you to write JavaScript code that is easier to maintain than if you were to code directly against the HTML representation of the controls. If you aren t familiar with how this works or don t understand how this helps, it is well worth returning to 4 before you continue with this chapter. Additionally, 4 introduced Atlas Script, which is an XML-based declarative model for programming your web pages. This is a powerful yet easy-to-use construct whereby you specify each of your controls as an XML tag and then, using various child tags such as <invokeMethod>, declaratively control the behavior of these controls and how they interact with others. You ll be looking at advanced functionality that uses both forms of manipulation in this chapter, including the following: Actions: Actions are collections of tasks, bundled into an atomic unit for managing complex tasks in a simple manner. Behaviors: Behaviors allow you to create specific functionality that can be reused and attached to specific controls and elements on your page. Data binding: As it sounds, data binding is the built-in facility that allows you to wire controls together to pass data between them. This chapter will walk you through many examples of web pages that use Atlas to provide sophisticated GUI functionality. You will start with some simple examples and work your way up to more complex ones that use binding, behaviors, and more. I have found this to be the best way to understand the power of Atlas to work through examples and then to dissect them in order to understand how they work.
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