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Fachpraktikum Graphische Benutzungsoberflächen Sommersemester 2008

Fachpraktikum Graphische Benutzungsoberflächen Sommersemester 2008. Mark Giereth, Steffen Koch, Christoph Müller, Guido Reina, Christiane Taras, Harald Bosch. Aufgabe 5: RSS/ATOM Proxy. Browser. Browser. AJAX- Handler. Basic concept of the RSS-Feed-Proxy.

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Fachpraktikum Graphische Benutzungsoberflächen Sommersemester 2008

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  1. FachpraktikumGraphische BenutzungsoberflächenSommersemester 2008 Mark Giereth, Steffen Koch, Christoph Müller, Guido Reina, Christiane Taras, Harald Bosch Aufgabe 5: RSS/ATOM Proxy

  2. Browser Browser AJAX- Handler Basic concept of the RSS-Feed-Proxy • Using asynchronous JavaScript and XML it is possible to update content partially • Advantage of such an approach is reduction of bandwidth and increased usability (may not be true for the visually impaired) by better responsiveness • Iterative tasks can be accomplished by polling • Traditional browser-webserver interaction is form-based • On submit content of previous (HTML-)page is dropped • According to an http-request including aparameters a new (HTML-)page is recieved and displayed Iterative Polling Cycle 1 Web Container http - request http - request Feed Proxy News Feeds http - response http - response Iterative Polling Cycle 2 Institut für Visualisierung und Interaktive Systeme – Universität Stuttgart

  3. Functionality of the Feed Proxy • Three requests allowed • Use AJAX to perform requests (test by browser) and handle results • Encode parameters in requests (get or post) Iterative Polling Cycle 1 subscribe_feeds Web Container unsubscribe_feeds http - request get_subscribed_feeds Feed Proxy News Feeds Browser http - response xml-response Institut für Visualisierung und Interaktive Systeme – Universität Stuttgart

  4. First steps of client development • Download Apache Tomcat 6.xhttp://tomcat.apache.org/download-60.cgi • Install it by unzipping it into arbitrary folder • Test Tomcat by starting it and browsing to:http://localhost:8080 • Checkout the feed proxy project • Adapt localconfig.properties file within project • Run ANT task „deploy“ on project • Try to browse to:http://localhost:8080/FeedServer/feed.server?action=subscribe_feeds&feedUrl= • Place your developments under corresponding subfolders of „web“ Institut für Visualisierung und Interaktive Systeme – Universität Stuttgart

  5. Requirements for the client • Subscription of new feeds • Selection of subscribed feed resulting in display of feed entries • Errors have to be presented appropriately • Automatic update of all feeds • Availability of new articles has to be signaled to the user • Feed sites as well as news have to be accessible by click (open in new window) • CSS has to be used • Loading-bar should be displayed when ajax request is performed Institut für Visualisierung und Interaktive Systeme – Universität Stuttgart

  6. Fragen?

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