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Listing 5.8 iUI will typically be used as part of a dynamic web page
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<body> <div class="toolbar"> <h1 id="pageTitle"></h1> <a id="backButton" class="button" href="#"></a> </div> <ul id="home" title="Recent Books" selected="true"> < $recent = searchRecentDB(25); for ($i = 0 ; $i < sizeof($recent) ; $i++) { if ($recent[$i][entrydate] != $lastdate) {
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> <li class="group">Entered < echo $recent[$i][entrydate]; > < } $lastdate = $recent[$i][entrydate]; > <li> <a href="display-entry.phtml mainid=< echo $recent[$i][mainid]; >" target="_self">< echo $recent[$i][title]; ></a> <i>< echo $recent[$i][authors]; ></i>
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< } > </ul> </body> [XHTML ]
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You will find nothing here surprising. You ve got a standard toolbar B, which you follow up with a default element C, once again using our old favorite, the unsorted list. The main body of this page is taken up by linked list items F. It s interesting to note that iUI will place additional content included after an anchor link on its own output line G, as shown here. We ve also included some group list items E, to help break up the page and give some order to what we re showing. The data lookup D deserves some additional discussion because it purposefully mirrors the methodology of the iPhone by showing data in bite-sized chunks, here 25 items. We ll look at an even fancier way to do this when we get to iUI tips and tricks in a moment. If we wanted to spend more time on this example, we d start off by allowing the user to scroll back through more than just the last 25 books. We d also try to make our search page look a little more attractive. Finally we d rewrite our book display pages in iUI too. All of that is ultimately beyond the scope of this example, but we do want to underline one fact: using iUI dynamically is very, very easy. Our working example literally took 10 minutes to put together. If you go view the page in an iPhone browser, you can see that those 10 minutes paid off with a simple, attractive interface. Now that we ve looked at how iUI is likely to be used in a real web environment, we ve only got one more iUI-related topic to discuss, one that we ve been promising for a while: those tips and tricks that you can use to improve your iUI experience.
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We re going to finish up our look at iUI by discussing some tips and tricks that are easy to use but that go beyond the needs of many web app developers. These include a more intensive look at Ajax and how it can help you organize your code and your listings; a simple way to include slightly smaller iUI libraries; and some methods to change the standard look and feel of iUI. We ll kick off with that code organization.
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You ve already seen that iUI changes the way web pages are written by representing many subpages as elements in a single HTML file. But as files gets larger (and thus
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Using iUI for web apps
more unwieldy over EDGE), you have to decide when you should create a new page in iUI rather than a new element. It turns out that there are three ways organize your iUI pages, as summarized in table 5.5.
Organization Single file Multiple fragments Multiple files Summary For small, singular applications For larger, singular applications For larger multipurpose applications Table 5.5 You can keep elements on the same page, maintain fragmentary subpages, or write totally different pages, depending on the app.
Each of the three methods shown in table 5.5 should be used in different circumstances. A single file is the standard process that we ve been using so far. It keeps things nicely organized on your side of things. It also preserves iUI s history stack, as we ve briefly mentioned before. Multiple fragments is an alternative that you can use if your file is getting too large and thus causing problems over EDGE. You need to start out with a single main file, as usual, but you can then put individual elements in subpages, and call them up through a normal URL. The trick is that the subpage must be a fragment, just like the fragment that we created for our search results. It can t contain headers or any other information. For example, in our color selector we might put each of our colors on a subpage, like red.html, green.html, and blue.html. Those subpages would then contain only the <ul> element in question. When the link on the main page is clicked, iUI will cleverly load your fragment into your main page, preserving the history stack. This is once more done with Ajax. Multiple files are the last and least desirable option. Using them will break your history stack, which could be disorienting for your users. But if your file is much too large or too complex, you might want to use them. An even better reason would be if you have several somewhat different applications all glued together. When you separate iUI pages in this manner, you should be careful to take the navigation between your separate pages outside of the normal iUI interface. That way, your users won t have any expectation of being able to page back to previous screens. The best method for doing so is a tabbed interface that sits on the first page of each of your iUI web apps, allowing users to move between them. It s important that this only appear on the highest-level pages in your web app, because those will be the places where there isn t any history on the stack. Remember that whenever you link to an external web page that isn t a fragment, you must include the target="_self" attribute. Otherwise, iUI will assume you re loading a fragment, and its JavaScript can get in the way of the new page popping up. Another method for melding together multiple web apps is to create a home page for your site that has iPhone-like buttons on it, similar to those that appear on the
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