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Based on the image_id element also included in the JSON data, we try to find the corresponding form element on the page for that image. We do this by looking for a form input with the value of the image ID. Once we find this element, we apply the Scriptaculous fade effect to make the image disappear from the page. We don t apply this effect to the actual image that was deleted; rather, we remove the surrounding list item so the image, form, and surrounding code are completely removed from the page. When the fade effect is called, the element being faded is only hidden when the effect is completed; it is not actually removed from the DOM. In order to remove it, we define the afterFinish callback on the effect, and use it to call the remove() method on the element. The callbacks for Scriptaculous effects receive the effect object as the first argument, and the element the effect is applied to can be accessed using the element property of the effect. We also use the afterFinish function to clear the status message. After we ve defined the options, we can create the actual effect. Since we want to remove the list item element corresponding to the image, we can simply call the Prototype up() function to find it.

Figure 9-25. Adding a RequiredFieldValidator to the EditItemTemplate 10. Switch to the PlayerCost EditItemTemplate and add a RequiredFieldValidator to the template. Set its properties as follows: Display: Dynamic Text: * ErrorMessage: You must enter a cost ControlToValidate: txtPlayerCost 11. Add a CompareValidator to the template and set its properties as follows: Display: Dynamic Text: * ErrorMessage: You must specify the cost as a decimal ControlToValidate: txtPlayerCost Operator: DataTypeCheck Type: Currency 12. Switch to the PlayerStorage EditItemTemplate and add a RequiredFieldValidator to the template. Set its properties as follows: Display: Dynamic Text: * ErrorMessage: You must enter a storage type ControlToValidate: txtPlayerStorage 13. From the DetailsView Tasks menu, select the End Template Editing option to switch the DetailsView back to its normal view.

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to store and retrieve user-specific information from a database. The only catch is that you need to authenticate the user in order to get the right information. You ll learn about profiles in 22.

Next, we will load the BlogImageManager JavaScript class in the preview.tpl template. In order to instantiate this class, we will add code to the blogPreview.js file we created in 7. Listing 11-41 shows the changes we will make to preview.tpl in the ./templates/ blogmanager directory to load BlogImageManager.class.js. Listing 11-41. Loading the BlogImageManager Class (preview.tpl) {include file='header.tpl' section='blogmanager'} <script type="text/javascript" src="/js/blogPreview.js"></script> <script type="text/javascript" src="/js/BlogImageManager.class.js"></script> <!-- // ... other code --> Listing 11-42 shows the changes we will make to blogPreview.js in ./htdocs/js to instantiate BlogImageManager automatically. Listing 11-42. Instantiating BlogImageManager Automatically (blogPreview.js) Event.observe(window, 'load', function() { // ... other code var im = new BlogImageManager('post_images'); }); If you now try to delete an image from a blog post, the entire process should be completed in the background. Once the Delete button is clicked, the background request to delete the image will be initiated, and the image will disappear from the page upon successful completion.

14. Set the CausesValidation property of the Add New Player LinkButton to false. 15. Save the page, and then view it in the browser. You ll find that it is now impossible to edit a Player or add a new Player if you haven t specified all of the required values. If you try to do this, you ll see that the validators report the errors, as shown in Figure 9-26.

State management is the art of retaining information between requests. Usually, this information is user-specific (such as a list of items in a shopping cart, a user name, or an access level), but sometimes it s global to the whole application (such as usage statistics that track site activity). Because ASP .NET uses a disconnected architecture, you need to explicitly store and retrieve state information with each request. The approach you choose to store this data can dramatically affect the performance, scalability, and security of your application. Remember to consult Table 7-3 and Table 7-4 to help evaluate different types of state management and determine what is best for your needs.

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