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Figure 6-11. The page processing sequence ASP .NET handles this by giving you two options: You can wait until the next postback to react to the event. For example, imagine you want to react to the SelectedIndexChanged event in a list. If the user selects an item in a list, nothing happens immediately. However, if the user then clicks a button to post back the page, two events fire: Button.Click followed by TextBox.TextChanged. And if you have several controls, it s quite possible for a single postback to result in several change events, which fire one after the other, in an undetermined order. You can use the automatic postback feature to force a control to post back the page immediately when it detects a specific user action. In this scenario, when the user clicks a new item in the list, the page is posted back, your code executes, and a new version of the page is returned.

It is possible to include a lot of different data in your feeds, depending on what you want to make available to subscribers. For instance, we specified only the description parameter; if you wanted, you could also include the full article. However, doing so may cause users to stop visiting your site directly. As mentioned, the Zend Framework manual lists all the options you can include in the array for Zend_Feed::importArray(); you can find it at http://framework.zend.com/manual/en/ zend.feed.importing.html.

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The option you choose depends on the result you want. If you need to react immediately (for example, you want to update another control when a specific action takes place), you need to use automatic postbacks. On the other hand, automatic postbacks can sometimes make the page less responsive, because each postback and page refresh adds a short, but noticeable, delay and page refresh. (You ll learn how to create pages that update themselves without a noticeable page refresh when you consider ASP .NET AJAX in 25.) All input web controls support automatic postbacks. Table 6-5 provides a basic list of web controls and their events. Table 6-5. Web Control Events

You ll now modify the example so that it also allows you to update an existing Manufacturer. In the earlier Player examples, a lot of the code was repeated in the INSERT and UPDATE examples. By combining the two pages, you can remove a lot of repeated code. 1. Open Manufacturers.aspx. In the Design view, set the DataKeyNames property of the GridView to ManufacturerID. 2. Switch to the Source view and add a ButtonField to the Columns collection of the GridView:

Button, ImageButton TextBox (fires only after the user changes the focus to another control) CheckBox, RadioButton DropDownList, ListBox, CheckBoxList, RadioButtonList

Microformats are a series of specifications for adding a consistent structure to certain kinds of data that appear on web pages. For example, whenever you needed to list the contact details for a person on a page in your web site (such as their name, e-mail address, and phone number), you would structure the HTML code used to output these contact details according to the appropriate microformat. In this particular case (of displaying contact details), you would use the hCard microformat (the microformats adaptation of the vCard standard). There are several published microformats (see http://microformats.org/wiki/ for a more comprehensive list) that can be used: hCard. Used for representing people or organizations (based on the vCard standard) hCalendar. Used for representing events and calendars (based on the iCalendar standard) hAtom. Used to represent data just as an Atom feed would Although this may give the impression of being restrictive in how you structure your code, it is in fact not restrictive at all. Microformats are used by applying certain class names or HTML attributes to the HTML code you are already creating.

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