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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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common.async.complete = function( status, statusText, responseText, responseXML) { if ( (common.complete) != null) { if ( common.complete( common, status, statusText, responseText, responseXML) == true) { if ( (common.presentation) != null) { common.presentation( common, common.state); } } } } common.isRemote = true; } The variable common is the object reference to the state that is passed across the various functionalities. The property common.async represents an Asynchronous instance. As explained in 2, Asynchronous requires an implementation for the property complete because that property is a function reference that will be called by Asynchronous when the server returns a response. Look closer at the implementation common.async.complete. In the implementation, the user s complete (common.complete) is called if it exists. The user s complete is the second step of the Common Data functionality. If the complete function returns true, the common.presentation function reference (if it exists) is called.
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Implementing the Presentation Functionality
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When implementing the Decoupled Navigation pattern, the Presentation layer is where the output is generated. The examples thus far have been very simple; the output has been an HTML injection. In a more sophisticated Ajax application, the output would be more complicated and would involve the creation of pop-up boxes, as illustrated in Figure 6-17.
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Figure 6-17. A more complicated user interface that uses a pop-up box
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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Figure 6-17 shows an HTML page containing a box that can be dragged around the page. To make the box work, and be draggable, quite a bit of Dynamic HTML magic is going on. Here is the important fact: the HTML box is Dynamic HTML, and not Ajax per se. As per the original definition,2 Ajax is not a technology, but the combination of several already-existing technologies. The focus of the Ajax patterns is not to explain the Dynamic HTML components, but to use the components in the context of Ajax. Part of the reason why this book does not attempt to explain and illustrate the Dynamic HTML components is that plenty of scripts do those tasks very well.3 The focus of this book is to integrate those already-existing components and make them Ajax aware. The aim of the Presentation functionality is to use the Dynamic HTML components to support the navigation. What is interesting about Figure 6-17 is that the Dynamic HTML to make the draggable pop-up box work is fairly complicated, but the content within the box is rather simple. It shows that the author of the component took great effort to make it easy to use the draggable pop-up box. Consider the following abbreviated source code that creates the pop-up box: <body> <div id="showimage" style="position:absolute;width:250px;left:250px;top:250px"> <table border="0" width="250" bgcolor="#000080" cellspacing="0" cellpadding="2"> <tr> <td width="100%"> <table border="0" width="100%" cellspacing="0" cellpadding="0" height="36px"> EBVN <tr> <td id="dragbar" style="cursor:hand; cursor:pointer" width="100%" onMousedown="initializedrag(event)"> <ilayer width="100%" onSelectStart="return false"> <layer width="100%" onMouseover="dragswitch=1;if (ns4) drag_dropns(showimage)" onMouseout="dragswitch=0"> <font face="Verdana" color="#FFFFFF"> <strong><small>Announcement Box</small></strong></font> </layer> </ilayer> </td> <td style="cursor:hand"> <a href="#" onClick="hidebox();return false"> <img src="close.gif" width="16px" height="14px" border="0"></a></td> </tr>
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2. http://www.adaptivepath.com/publications/essays/archives/000385.php 3. http://www.dynamicdrive.com, http://www.dhtmlcentral.com, http://scriptasylum.com, http:// www.hotscripts.com, http://www.howtocreate.co.uk, http://webdeveloper.earthweb.com, and so on. If I did not mention your website, I am sorry. Send me an e-mail at christianhgross@gmail.com, and I will create a reference list at the URL http://www.devspace.com:8080.
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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<tr> <td width="100%" bgcolor="#FFFFFF" style="padding:4px" colspan="2"> <!-- PUT YOUR CONTENT BETWEEN HERE --> Testing 1 2 3 <!-- END YOUR CONTENT HERE --> </td> </tr> </table> </td> </tr> </table> </div> </body> After you look at the HTML source code, your first impression might be, Okay, so what does this actually do The answer is, No idea, and it is not really necessary to know. What you need to know is where to put the content, and that has been shown in bold. The place is marked, and if the table cell had an identifier attribute, the contents of the pop-up box could be injected. This is good because it means for the Presentation functionality you don t need to know how the HTML component works.4 What you need to know is how to tweak the components, and specifically what you want to know are the following attributes:
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