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PDFfiller supports PDF, Word, PowerPoint, JPEG, PNG and Text formats. Browse for a Document on ... Edit Scanned Document Online: Try Risk Free. edit pdf. Instructions and Help about scanned pdf editor online. Did you ever need to edit ... Users of Microsoft Visual Basic or ASPNet are familiar with the notion of having an associated source code file (or class) that provides the back-end plumbing that handles events, updates data, and so on for a specific page This is known as the backing bean concept, and although not specifically required by the Faces specification, it is fully supported and recommended in most cases In fact, several JSF-enabled integrated development environments (IDEs) enable or, in some cases, force this programming style on the developer (You will see examples of this in 17 when we examine JSF development with several JSF-enabled IDEs) To implement a backing bean approach in JSF, you can create a Java class for each JSF page and register it as a managed bean It is recommended that backing beans be declared to be in request scope The most preferred usage is to have a single backing bean per page although this is not enforced by any specification A common usage is also to name the class the same name as the page For example, loginjsp would have an associated backing bean of Loginjava Placing the backing bean classes in a sub-package of backing is also useful Finally, the backing beans can also be registered in the faces-configxml with _Backing added to their names so you always know which beans are backing beans In general the backing bean holds the following artifacts for a page: Properties corresponding to input fields on a page, such as string properties for userid and password Action methods and action listeners that correspond to UI components that initiate action events, such as clicking on Register or Next Page buttons Declarations of UI component instances that can be directly bound to the UI components used on the page (We ll drill down on this usage in more detail in 6) In short, it is the responsibility of the backing bean to serve as a conduit from the page to server-side application logic In other words, it serves as the middle man between the page and the back-end business logic A typical set of pages and their corresponding backing beans that link to back-end business logic is shown in Figure 4-3 To get a better idea of how the backing bean concept works, consider a typical login example In this example you could have a page (loginjsp), which is built with a collection of UIInput components (input fields) to accept the login credentials In this example, the backing bean can be a Java class, Loginjava, which has a corresponding set of JavaBean properties (of type String) for temporarily storing the user s login credentials To handle the user s button click on a Login button (UICommand), an action method, checkUserCredentials( ), could be invoked It could then call a back-end business method that performs a database or LDAP lookup of the user to determine whether the credentials are valid Figure 4-4 illustrates this example. insert image in pdf online: Extract images from PDF online add image to pdf online Easy to use Online PDF editor - Sejda
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Extract images from pdf - is an online application that can be used to save all pdf images and save them locally (Jpg, Gif, Png or Bmp) Here is a more advanced example of backing bean usage where a page, employees_ tablejsp, displays a scrollable table of employee information using a corresponding backing bean, EmployeesTablejava In this example, the JSP page uses an HtmlDataTable (<h:dataTable/>) component to display a table of employee records It also uses a custom Scroller UI component that works with methods in the backing bean to handle scrolling events such as next page, previous page, first, and last to navigate through the data being displayed by the table component The JSP page could also have columns for row-level operations such as Edit and Delete When the user clicks Edit, he or she would navigate to a different page to edit the row values in a form Clicking on Delete would simply delete the selected record and remain on the same page For this example, the backing bean (EmployeesTablejava) would most probably have the following: Any Java bean properties that are value bound to components in the page In this example the <h:dataTable> (HtmlDataTable) component could be value bound to a Java bean property that returns either a List, Result, ResultSet, or an Array For example: 4: insert image in pdf online Extract images from PDF online
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