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Because the tags table will be linked with posts in a has and belongs to many relationship, you must create another table to hold those associations. This table name will follow Cake s naming conventions. For has and belongs to many tables, the name must be arranged in alphabetical order with each associated table s name separated by an underscore. Inside the table, you provide the foreign key and associated foreign key as fields with names following the same convention for one-to-many relationships. In this case, the field names will be ordered alphabetically, with post_id first and tag_id second. Use Listing 4-11 to create the new posts_tags table. Listing 4-11. The posts_tags Table CREATE TABLE `posts_tags` ( `id` int(11) unsigned NOT NULL auto_increment, `post_id` int(11) unsigned default NULL, `tag_id` int(11) unsigned default NULL, PRIMARY KEY (`id`) ); The Tag model is absent, so create that next as the app/models/tag.php file. Paste Listing 4-12 into the new Tag model file. Listing 4-12. The Tag Model 1 2 3 4 5 6 < class Tag extends AppModel { var $name = 'Tag'; var $hasAndBelongsToMany = array('Post'); } >

There s one caveat with this approach. If you perform an update that takes a long time, it could be interrupted by another update. As you know, ASP.NET AJAX posts the page back asynchronously, so the user is free to click other buttons while the postback is under way. ASP.NET AJAX doesn t allow concurrent updates, because it needs to ensure that other information such as the page view state information, the session cookie, and so on remains consistent. Instead, when a new asynchronous postback is started, the previous asynchronous postback is abandoned. For the most part, this is the behavior you want. If you want to prevent the user from interrupting an asynchronous postback, you can add JavaScript code that disables controls while the asynchronous postback is under way, but this takes significantly more work. Another option is to use the UpdateProgress control discussed later in this chapter.

Tip There s one other way to update a conditional UpdatePanel you can call the UpdatePanel.Update()

Compare your results to Figure 5-12.

Next, you will have to establish the association in the Post model as well. Adjust this model to reflect the has and belongs to many relationship, as shown in Listing 4-13. Listing 4-13. The Post Model with the $hasAndBelongsToMany Attribute Set 1 2 3 4 5 6 7 < class Post extends AppModel { var $name = 'Post'; var $belongsTo = array('User'); var $hasAndBelongsToMany = array('Tag'); } >

method from your server-side code. This allows you to decide on the fly whether a certain panel should be refreshed. However, you must be careful not to call Update() on a panel that uses an UpdateMode of Always, and you must not call Update() after the page has been rendered. If you make either of these mistakes, you ll cause an exception.

So far, the examples you ve seen have used the built-in behavior of the UpdatePanel. In the next example, you ll use the UpdatePanel in a slightly more sophisticated page, and you ll learn to control its refreshes with triggers. Earlier in this book, you learned how to build a web page that allows the user to dynamically build a greeting card. This page lets the user specify several details such as text, font, colors, border options, and so on and then updates a portion of the page to show the greeting card. 6 demonstrated two versions of the greeting card maker. The first version allowed the user to specify a number of options at once, and then click a button to update the greeting card. The second version used automatic postback events, so that the greeting card was updated after every change. This second approach gave a more immediate result, but the cost was a less responsive user interface with distracting flicker. If this version of the greeting card maker was running on a slow web server (or over a slow network), the problems get even worse. That s because after every postback the user is forced to wait for the page update before making another change. The UpdatePanel gives you the ability to get the best of both versions. You can create a greeting card page that updates its display automatically but feels more responsive and doesn t lock the user out. The simplest approach is to add a ScriptManager and wrap the entire web page including the controls and the greeting card in one giant UpdatePanel. Here s the markup you d use: