.net pdf 417

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This method simply finds the content area, assuming its ID to be the ID of the reader with the value _content appended to the end. Once it finds the content element, it navigates to the children and finds the nth div child and returns it. This finishes our treatment of transitions. Let s now examine the topic of loading our RSS feeds via the magic of Ajax. Loading RSS feeds with Ajax We ve given a fair amount of attention to the topics of creating a component and providing a rich slideshow semantic and fancy DHTML techniques for transitioning between slides. But without Ajax at the core, the fanfare would be for naught. The point is that it s the synergy between Ajax, with its scalability and finegrained data retrieval, and sophisticated DHTML, with its rich affordances and effects, that provides a superior user experience. Okay, enough of the soapbox. Let s look at some Ajax, starting with the method in listing 13.40 that loads an RSS feed into memory.

loadRSSFeed: function(feedIndex, forward) { this.feedIndex = feedIndex; this.itemIndex = forward 0 : "last"; new net.ContentLoader(this, this.options.rssFeeds[feedIndex], "GET", [] ).sendRequest(); },

$sudo defaults read /Library/Preferences/DirectoryService/DirectoryService { "Active Directory" = Inactive; AppleTalk = Active; BSD = Active; Version = "1.1"; }

Microsoft s Active Directory ( AD ) presents an interesting opportunity----one that Apple needed to take advantage of. In an environment with any investment in Active Directory, it s unlikely that a company will just rip out Windows servers and replace them with Mac OS X Server just for the sake of client management. Fortunately, there s no need.

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This method uses our ever-familiar net.ContentLoader to make an Ajax request, passing the URL of an RSS feed as specified in the this.options.rssFeeds array. The forward parameter is a boolean specifying whether or not we re loading in new content as a result of moving forward. Given this knowledge, the itemIndex property is updated accordingly. Note that itemIndex is given the value of last rather than an integer if we re moving backward. That s because we want itemIndex to indicate the index of the last item in the previous RSS feed. The only problem is that we don t know how many items are in the feed, because it isn t loaded yet. You ll recall that the ajaxUpdate and handleError methods are required as an implicit contract with the net.ContentLoader. We will look next at the ajaxUpdate method, shown in listing 13.41, to see how the implementation resolves our indexing dilemma.

To enable a particular plug-in (LDAPv3 is enabled by default), you can simply set the value to Active and then restart your DirectoryService daemon:

ajaxUpdate: function(request) { if ( window.netscape && window.netscape.security.PrivilegeManager.enablePrivilege) netscape.security.PrivilegeManager.enablePrivilege( 'UniversalBrowserRead'); this.currentFeed = RSSFeed.parseXML(request.responseXML.documentElement); if ( this.itemIndex == "last" ) this.itemIndex = this.currentFeed.items.length - 1; this.updateView(); },

$sudo defaults write /Library/Preferences/DirectoryService/DirectoryService "LDAPv3" "Inactive" $sudo killall DirectoryService

The ajaxUpdate method starts with a check to see if it s running in an environment that provides a PrivilegeManager. If so, it asks to grant the UniversalBrowserRead privilege. As noted earlier, this is done so that our reader can run locally within a Mozilla-based browser. The this.currentFeed is an instance of our RSSFeed model object that we defined in the Model section. It corresponds to the single RSSFeed loaded into memory, as populated from the Ajax response. If this.itemIndex has a value of last as set by the loadRSSFeed method when moving backward the itemIndex property is updated to contain the actual number of items in the newly loaded RSSFeed. Finally, the UI is updated via a call to updateView(). Let s not forget to do our due diligence and define a handleError method both to satisfy our contract with the net.ContentLoader and because we really should do something to handle errors. If an RSS feed fails to load, we ll just provide a punt message, as shown in our handleError implementation. More sophisticated implementations are certainly possible and desirable.

Or, if you re feeling constructive, maybe you want to enable a plug-in, following the same modus operandi:

handleError: function(request) { this.getLayer(this.visibleLayer).innerHTML = this.options.errorHTML; },

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