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handled in Tapestry. The ImageSubmit component is used to generate the image button to be used for a form submission. It extends the much simpler Submit component as shown: <img jwcid="@ImageSubmit" image="asset:btn_submit" alt="Submit" src="images/submitButton.png" /> Another side effect of the rich object-oriented nature of the Tapestry component library is the amount of reuse; complex components can be created by extending or aggregating simpler components. In the ImageSubmit component we are declaring that the image will be provided by the Tapestry asset manager and that the name of the asset is btn_submit. Also, alternate text is provided in the case that the user browser has images disabled. Finally, to enable an accurate HTML static page, the actual image is presented using the src attribute. As you ll learn, assets eliminate the confusion of finding assets (resources such as images and other media) typically encountered in sites with multiple pages in multiple directories. To create an asset for the submitButton.png image, add an asset element to the Home.page definition file as shown next (which assumes that the image is in the images directory under the context directory). <asset name="btn_submit" path="images/submitButton.png" /> With the HTML template modifications in place, we need to update the Home class to satisfy the components in the template. Listing 7-10 shows the modified Home class. Listing 7-10. A More Elaborate Home.java public abstract class Home extends BasePage implements PageBeginRenderListener { private static String[] FORMAT_STRINGS = new String[] { "h:mm a", "EEE, MMM d, ''yy", "hh 'o''clock' a, zzzz", "K:mm a, z"}; public static final IPropertySelectionModel FORMAT_MODEL = new StringPropertySelectionModel(FORMAT_STRINGS); private Format timeFormat; public void pageBeginRender(PageEvent event) { if (getFormatString() == null) { setFormatString(FORMAT_STRINGS[0]); } } public Format getTimeFormat() { timeFormat = new SimpleDateFormat(getFormatString());
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return timeFormat; } public Date getTime() { return new Date(); } public abstract String getFormatString(); public abstract void setFormatString(String formatString); public void formSubmit(IRequestCycle cycle) { System.out.println("The form has been submitted!"); } } Let s start with definition of the FORMAT_MODEL, for which we will use the simple StringPropertySelectionModel, which enables a string array to be used as the source of the labels in the drop-down and uses a simple integer index as the value. A String[] containing several format strings that can be used with a java.text.SimpleDateFormat instance is created and is then used in the constructor of the StringPropertySelectionModel. The getFormatString method will return the value of the selected format string after a form submission. This value is used in the getTimeFormat method to return a Format object. The formSubmit method returns void and has an empty implementation. Returning void signifies that the page to be rendered after the submission is the current page and the method body is empty of any functionality since the value of the drop-down selection has already been assigned to the formatString property. You might notice that the getFormatString and setFormatString are abstract methods. At runtime Tapestry will create a concrete implementation of the Home class and will provide implementations for all abstract getter and setter methods as well as a field to hold the value of the property. Developers new to Tapestry and who haven t encountered this clever usage of abstract classes might feel a bit apprehensive about coding to abstract classes. But this is one of the greatest strengths of Tapestry, and it shows the best possible way to intermix concrete user provided code while still exploiting the dynamic features of the environment. Finally, we need to assign a value to the format string when the page is being rendered, not as the result of a form submission. To accomplish this we need to be aware of the Page life cycle. Tapestry pages produce several different events which can be listened to by implementing the right listener interface. In this case we implement the org.apache.tapestry.event. PageBeginRenderListener, which is used to determine when a page is about to be rendered. The implementation of the void pageBeginRender(PageEvent event) method checks if the formatString is null, and if so it assigns the first value in the array. The running application is shown in Figure 7-10. Selecting a format string from the dropdown and clicking the Submit button should result in the displayed string changing to the selected format.
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