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The following page has been changed by MichaelJouravlev: http://wiki.apache.org/struts/StrutsManualActionWebComponent ------------------------------------------------------------------------------ #format wiki #language en - Struts 1.3.x (TBD) allows building portlet-like web components using JSP as view technology. The components work properly with or without Javascript enabled. + Struts 1.4 allows building portlet-like web components using JSP as view technology. The components work properly with or without Javascript enabled. Struts Components have the following features: @@ -15, +15 @@ * Ensures that every component renders itself independently. * Updates page incrementally without full page refresh if browser has Javascript turned on and XMLHTTPRequest is available. * Seamlessly integrates with Struts, enhancing a well-known action framework with component technology. + + == Struts Component Lifecycle == + + ''Struts web component'' is an independent stateful server-side object that accepts user input via Action class, and renders itself via JSP file. + + The component lifecycle is managed in a five-step process: + + 1. The cycle begins with the initial load of a composite page, starting the render phase. + 2. When the JSP processor encounters a <c:import> action in a composite page, it generates an HTTP request to obtain the content of the included component. + 3. The Action class forwards to a view relevant to component state. After all components on the composite page have rendered themselves, the render phase finishes and a composite page is presented to a user. + 4. The user initiates the input phase by submitting an HTML form or by activating a command link. The browser sends input data to an Action that manages component events and state. The Action processes data and updates component state if needed. Component state can be stored in a session-scoped form bean, in a database or in other location. + 5. After input data has been processed, the Action automatically redirects to location of the composite page, effectively switching from input phase back to render phase. Steps 1 through 3 are repeated, and an updated page is presented to the user. + + If the browser has JavaScript turned on and the XMLHTTPRequest object is available, the component switches to Ajax mode by making an asynchronous request to update the component without full page refresh, so steps 5, 1, and 2 are skipped, and step 4 jumps right to step 3. The incremental update is more effective in regards to network traffic and avoids the complexities of identifying the reload address. + + A Struts component incorporated into a page looks and behaves uniformly whether it runs in Ajax mode or not. The dual-mode functionality of Struts web components is invaluable for environments where JavaScript is not allowed or in browsers that do not support the XMLHTTPRequest object, like some mobile browsers. == Use Case: Home Page With Login Component ==
