Page Builder
The page builder component loads the portal applications and builds the page so that it is displayed properly in the browser. The page building process has two stages:
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The page builder gets the list of portal applications that are on that page from the page editor. It reads the properties of the portal applications and loads the portal applications using the Portal Runtime (PRT).
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The page builder loads the page layout component that is based on a JSP file. It represents the actual visual layout of the page and can be edited in the layout view of the Page Editor. The page layout component takes the response from every portal application, wraps it with a tray and places it on the page at the right location.
The page building process is asynchronous, therefore the loading of the page does not take longer than it takes to load the slowest portal application in the page (unless a specific page timeout was defined).
Page Layout Component
The page builder layout is defined by JSP templates with a dedicated tag library for organizing portal applications on a page. The main tag of the tag library is the container tag <lyt:container> which serves as space holder for columns of portal applications. Every container turns into an HTML table with a portal application in every cell.
If a portal application should be placed in a tray, the page layout wraps it with an HTML Business for Java (HTMLB) tray control.