free barcode generator c# code Figure 5.4 A dialog allows users to conduct searches. in Objective-C

Printer QR in Objective-C Figure 5.4 A dialog allows users to conduct searches.

Figure 5.4 A dialog allows users to conduct searches.
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Listing 5.5 Creating a search-like form with the dialog class
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<form id="searchForm" class="dialog" action="search.php"> <fieldset> <h1>Color Search</h1> <a class="button leftButton" type="cancel">Cancel</a> <a class="button blueButton" type="submit">Search</a> <label>Color:</label> <input id="color" type="text" name="color"> </fieldset> </form>
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Although we listed dialog as a <form> class in table 5.2, it can technically be applied to anything; but it probably doesn t make much sense for anything but a form.
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Using iUI for web apps
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Inside the dialog class, the order of the contents is important. You must have a B, which is used to logically group form elements together and then draw a box around them. Then you must have a level one header C, which will appear amid the chrome at the top. Omitting either of these will cause your dialog to display incorrectly. The buttons D can be set in several configurations. Here you display both cancel and search buttons. This isn t quite how the iPhone does things by default, but it provides a more complete UI, thus trading off usability for conformity. If you prefer to stick with the iPhone standard, replace the pair of buttons with a single Cancel line:
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<fieldset>
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<a class="button" type="cancel">Cancel</a>
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Note that this example also introduces how to apply the iUI button classes. The button class by itself always displays a right-justified gray button, but by applying multiple classes, you can move that button to the left (with leftButton) or turn it blue (with blueButton). We ll return to all the ways in which buttons can be used later. After placing your buttons, you can put together a long series of <label> E and <input> F lines. In each case, the label is placed into the background of the input, showing what should be entered in that box. This example only includes one such pair, but additional ones can be entered identically. The one thing that this example doesn t show is the actual back end, search.php. As it turns out, that works in a special manner under iUI.
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iUI searches done right with Ajax
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iUI s search functions use Ajax, bringing us back to the idea of Ajax and page fragments, which we touched on when we looked at external links. iUI uses Ajax in a couple of places to replace individual elements rather than redrawing a whole web page. Not only does this make an application faster, but it also cleverly allows iUI to maintain its overall stack of history pages. This is all easy to do because iUI takes care of the Ajax details for you in a relatively transparent manner. You don t need to know that you re using Ajax; you just need to know that in some situations you must supply fragmentary pages that contain only iUI elements rather than complete pages. This is the case with iUI-based searches. Your search result pages should not draw full pages, nor should they forward you to full pages. Instead, they should output an individual element, just like those elements that you ve been writing to model other iUI subpages. Listing 5.6 shows what search.php might output after a search for Maroon .
Listing 5.6 A search page fragment
<ul id="search" title="Maroon"> <li><font color="#800000"><b>Maroon (#800000)</b></font> </ul>
Developing with iUI
How the back end of your search works is, of course, entirely up to you. All that matters is that the output supplies a fragment, because that s what iUI s Ajax engine expects to see.
iUI panels and rows
That leaves us with just one missing item from our iUI color selector example: the settings page. We ll be laying this out with our remaining iUI classes for this example: panel and row (see listing 5.7). These classes are meant to mimic the Settings page found on your iPhone, with its rows of options that you can change.
Listing 5.7 Panels, rows, and toggles forming another user input model
<div id="settings" title="Settings" class="panel"> <fieldset> <div class="row"> <label>Color in Names</label> <div class="toggle" onclick="return;"> <span class="thumb"></span> <span class="toggleOn">ON</span> <span class="toggleOff">OFF</span> </div> </div> </fieldset> </div>
The panel class B works similarly to the dialog class by building data into a <fieldset> C. The result is an inset panel. If you d like, you can put an optional header above the <fieldset> but still inside the panel class, which will label your panel for you. We ve opted not to do so in this example because you only have one panel on the page, but if you had multiple panels, doing so might help your organization.
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