itextsharp barcode example vb.net Developing JSF Applications with Visual Development Environments in Java

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Developing JSF Applications with Visual Development Environments
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FIGURE 17-2
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Studio Creator s visual design environment
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collapsible code regions (referred to in Sun s documentation as code folding) The JSP code editor also provides a very helpful tag completion feature, shown in Figure 17-3, where matching tags appear in a menu after typing the initial characters In addition to tag completion, there is also tag attribute completion where after a tag has been typed, a list of attributes appears in a menu Creator even provides a help window below on the selected attribute Creator s Java source code editor is also feature-rich with code folding, code completion, syntax coloration, automatic error detection, and several refactoring options
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Building the Simple Virtual Trainer Application in Studio Creator
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To start building the simplified version of the Virtual Trainer application, a new welcome page (welcomejsp) is created For this page, we will use Creator s default grid layout with absolute positioning To build the banner portion of the welcome page, we ll use Creator s default set of UI components (although the Standard components are also available on the Palette) For the image, we use <ui:image>, and for the banner text, a <ui:staticText> component Since the default grid layout has been applied, the components have their style attribute set to define their location on the page:
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<ui:image binding="#{welcomeimage1}" id="image1" style="left: 24px; top: 24px; position: absolute" url="/resources/vtlogojpg"/>
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JavaSer ver Faces Tools and Libraries
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FIGURE 17-3 Studio Creator s JSP code editor
Notice also that the binding attribute is set to an auto-generated image1 component of type import comsunravewebuicomponentImageComponent, which is declared in the backing bean (Welcomejava), as shown next:
private ImageComponent image1 = new ImageComponent();
This illustrates a very important feature to be aware of: when any UI component is dropped onto the page, it will automatically have its binding attribute set to a component declaration that is automatically generated in the backing bean for the page Studio Creator prefers to manage these components and even places warnings against modifying the Creator-managed code in the generated code
Building the Navigation Model
To productively build the Faces navigation model, there is a Faces Page Navigation page flow design view (shown in Figure 17-4) With this view, you can design the overall application navigation model as well as create new pages From the Page Navigation window, you can create the entire navigation model as well as starter pages (loginjsp and tablejsp) To create a new page in the Page Navigation window, right-click the diagram and select New Page Creating navigation rules is simply a matter of dragging lines from one page to another The navigation view also offers a Source toggle button, which allows direct editing of the navigation model using an XML editor To quickly edit the new login page, you can doubleclick the page in the navigation view and jump to the JSP editor To build the login form shown in Figure 17-5 on the page, we will use a standard <h:panelGrid> component to contain two Sun <ui:label> components, along with input components: <ui:textField> and a <ui:passwordField> To complete the page, a <ui:button> tag is added to the page to allow the form to be submitted A <ui:messageGroup> tag, which renders any system/error messages, is also added
17:
Developing JSF Applications with Visual Development Environments
FIGURE 17-4
The Studio Creator page ow navigator
A nice feature in the visual editor is that when the button is double-clicked, an action method is auto-generated and bound to the button As shown in Figure 17-6, you are then placed inside of the auto-generated action method This behavior is reminiscent of Microsoft s Visual Basic or Visual Studio For our application, double-click the button and add the simple login code After manual editing, the completed method checks the values of the two input UI components and returns success if they both equal jake
PART IV
FIGURE 17-5
The Simple Virtual Trainer s login page in Studio Creator
Part IV:
JavaSer ver Faces Tools and Libraries
FIGURE 17-6 Creating an action method that s bound to a button in Studio Creator
Since Studio Creator is based on Sun s more general-purpose Java IDE, NetBeans, it has a high-quality Java source code editor with code completion capabilities that include collapsible code regions (also known as code folding) To build the tablejsp page, we ll opt for using Sun s more advanced <ui:table> to display the training event data As the <ui:table> component is dropped onto the page, it will render in a generic, non-databound form Then we ll open the Servers window, which has a registry of Data Sources where connections to databases are stored, and drag a database table (containing training events) and drop it on top of the <ui:table> This action creates a usable javaxsqlrowsetCachedRowSet object (trainingeventsRowSet) and makes it available to the <ui:table> component on the page The <ui:table> rendered in the visual editor then takes on an appearance which shows the column data-types of the actual data This is shown in Figure 17-7 At this point, we can edit the generated table directly, removing or reordering columns in the visual editor If any extra editing of the underlying data object for the table (trainingeventsRowSet) is needed, Studio Creator provides a Query Editor that allows for both visual and direct editing of the database query that defines the data provided to the RowSet data object As shown in Figure 17-8, the top pane of the Query Editor displays the database tables as well as their relationships The second pane allows for column selection, while the third pane allows for direct editing of the query The bottom pane (which is currently empty) will display the results of the query
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