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Implementing the Action Functionality
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When implementing the Action functionality, most likely what you will be doing is implementing some HTML event. The event could be the result of a mouse click, timer event, HTML form being submitted, or other HTML event. Regardless of what event it is, it needs to be processed. When processing events, the challenge is to define which element captures the event, and what event to capture.
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The simplest of all navigations is the link, which in the default case will replace the current content with the content of another URL. The notation of the link is defined as follows: <a href="http://www.apress.com">Apress</a>
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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The a HTML element has an href attribute, which indicates the destination URL that the web browser will navigate to. Clicking on a link results in whatever content you have loaded being replaced with the content that the URL http://www.apress.com contains. With respect to writing Ajax applications, these types of links are dangerous because they will replace the current content that has a state with brand new content that has no state. Pressing a Back button does not reload the old state, but loads a new state. The described simple link is akin to killing an application and then starting a new application. One way to save the content and state is to use the State Navigation pattern, which saves the state of the content before loading the new content. Another way of getting around the content deletion problem is to redirect the content to another window, as illustrated by the following link example: <a href="http://www.apress.com" target="external">External Link</a> The additional attribute target references an identifier that represents another window identifier. If the window identifier does not exist, a brand new window is opened and the content is loaded into that separate window. If the content needs to be loaded locally, a frame is used. Following is an example that uses a floating frame: <a href="http://www.apress.com" target="external">External Link</a></p> <iframe name="external"></iframe> A floating frame is a document within a document. Figure 6-8 shows an example.
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Figure 6-8. A floating frame, or document within a document Using a frame creates a document-within-a-document architecture and has been a way for web application developers to mimic the XMLHttpRequest object behavior. The following example mimics the XMLHttpRequest object behavior by using a floating iframe with a pixel size of 1 by 1 in a small corner to the side of the document:
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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<html> <head> <title>Document Within a Document</title> </head> <script language="JavaScript" type="text/javascript"> function LoadedContent( frame) { window.alert( "Location (" + frame.contentWindow.location.href + ")"); } </script> <body> <a href="http://www.apress.com" target="external">External Link</a></p> <iframe name="external" onload="LoadedContent( this)"></iframe> </body> </html> In the example HTML, the iframe has an attribute, onload, that represents an event that is triggered when the document within iframe has been loaded. In the example, the function LoadedContent is called, which will generate a pop-up box displaying the URL of the loaded document. What is of special interest is the frame.contentWindow.location.href reference, which crosses domain boundaries. Remember from 2 there was an explanation of the same origin policy. The property frame.contentWindow is considered one domain, and location.href is considered another domain. If both domains fall under the same origin policy, the window. EBVN alert pop-up box can execute. If, however, both domains do not fall under the same origin policy, a permission exception is generated. The property reference location.href causes the permission exception. It is possible to load content that violates the same origin policy, but it is not possible to manipulate that content, nor is it possible for the loaded content to manipulate the caller.1 What has not been illustrated, but is possible, is to load content into a frame that is then used to manipulate content in the caller. In that situation, the frame behaves like the Content Chunking pattern as the frame provides a chunk of content that is injected.
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