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Oracle® HTML DB
Release 2.0 |
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A page is the basic building block of an application. When you build an application in Application Builder, you create pages that contain user interface elements, such as tabs, lists, buttons, items, and regions.
Topics:
You add controls to a page on the Page Definition.
To view the Page Definition of an existing page:
Navigate to the Workspace home page.
Click the Application Builder icon.
Select an application.
Select a page.
The Page Definition appears.
The Page Definition is divided into three sections:
Page Rendering lists user interface controls and logic that is executed when the page is rendered.
Page Processing lists logic controls (such as computations and processes) that are evaluated and executed when the page is processed.
Shared Components lists common components that can display or be applied on every page within an application.
The following list briefly describes Page Rendering section on the Page Definition:
Regions. Lists regions on the current page. A region is a area on a page that serves as a container for content. Each page can have any number of regions. You control the appearance of a region through a specific region template. You can use regions to group page controls (such as items or buttons). You can also create simple regions that do not generate additional HTML, or create elaborate regions that frame content within HTML tables or images.
Buttons. Lists buttons on the current page. Buttons are used to submit a page. When you submit a page, the HTML DB engine processes it, or redirects users to another page without any processing. A button can be implemented as an HTML button, an image, or by using a template.
Items. Lists items on the current page grouped by region. Items are HTML form elements such as text fields, select lists, and check boxes with an associated session state.
Computations. Lists the computations that are executed at the time the page is rendered. Computations are units of logic used to assign session state to items.
Processes. Lists the processes that are executed at the time the page is rendered. Processes are logic controls used to execute data manipulation language (DML) or PL/SQL. For example, you can use a process to populate session state at the time the page is rendered.
The following list describes Page Processing section on the Page Definition:
Computations. Lists the computations that are executed at the time the page is processed. Computations are units of logic used to assign session state to items.
Validations. Enables you to create logic controls to verify whether user input is valid. For example, a validation can check whether or not a value has been entered into a mandatory field.
Processes. Lists the processes that are executed after the page is submitted. Processes are logic controls used to execute data manipulation language (DML) or PL/SQL.
Branches. Enables you to create logic controls that determine how the user navigates through the application.
Shared components are common elements that can display or be applied on any page within an application. The following section briefly describes the Shared Components section of the Page Definition.
Tabs are an effective way to navigate between pages of an application. Application Builder includes two different types of tabs: standard tabs and parent tabs
An application having only one level of tabs uses a standard tab set. A standard tab set is associated with a specific page. You can use standard tabs to link users to other pages within your application. A parent tab set functions as a container to hold a group of standard tabs. Parent tabs give users another level of navigation as well as context (or sense of place) within the application.
A list of values (LOV) is a static or dynamic definition used to display a specific type of page item, such as a radio group, check box, or select list. LOVs can be static (that is, based on a set of predefined display and return values) or dynamic (based on SQL queries that select values from tables). Once created, a LOV can then be referenced by one or more page items.
You define LOVs at the application level by running the LOV Wizard and adding them to the List of Values repository.
A breadcrumb is a hierarchical list of links that is rendered using a template. For example, you can display breadcrumbs as a list of links or as a breadcrumb path.
A list is a collection of links that is rendered using a template. For each list entry, you specify display text, a target URL, and other attributes that control when and how the list entry displays. You control the display of the list and the appearance of all list entries by linking the list to a template.
A theme is a named collection of templates that defines the application user interface. Each theme contains templates for every type of application component and page control, including individual pages, regions, reports, lists, labels, menus, buttons, and list of values.
Templates control the look and feel of the pages in your application. As you create your application, you specify templates for pages, regions, reports, lists, labels, menus, buttons, and popup list of values. Groups of templates are organized into named collections called themes.
You can provide security for your application by specifying an authorization scheme. Authorization is a broad term for controlling access to resources based on user privileges.
Use a navigation bar to link users to various pages within an application. Typically a navigation bar is used to enable users to log in and log out or link to Help text. The location of a navigation bar depends upon the associated page template. A navigation bar icon enables you to display a link from an image or text. When you create a navigation bar icon you can specify an image name, text, a display sequence, and a target location (a URL or page).