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A common function of a client web application is data entry through forms. The typical workflow for forms is that the user enters information, and a special type of input tag called a submit button triggers an HTTP postback of the information to a server. The server then processes the submitted information and returns a response. If the data is invalid, the server returns a message indicating this, and the page developer writes a script that emphasizes this to the user. This transaction involves at least one round-trip to the server. You can also perform basic validation in JavaScript prior to form submission; this can be very effective and certainly faster for the user. However, performing validation using JavaScript can be a complex task, which ASP.NET AJAX control extenders lend themselves naturally to. The FilteredTextBox extender is very useful in that it forces inline validation on a target control. You can apply a custom validator or one of the provided ones to a TextBox control and prevent the user from entering invalid input. This guarantees that invalid data cannot be passed on from the text box (excluding HTTP data injection or other advanced malicious attempts). The main properties of the FilteredTextBox extender are listed in Table 8-3.

8. Drag the playhead to frame 36, and click the leaf on the stage. Drag the leaf toward the center of

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the stage to the bottom of the stage. If you scrub through the timeline, you will see the leaf move quite a distance to the right. This tells you that you can change an animation by simply changing the location of an object in a keyframe.

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Flash. If the effect wasn t quite right, you made the round-trip again. Those days are over, and, thankfully, these same filters have become part of Flash. The ability to use filters directly in the Flash authoring environment (and animate them, to boot) has handed you a quick-and-easy method to create some fascinating visual effects. The filters that are available in Flash are as follows: Drop Shadow: Places a gray or colored shadow beneath an object, which gives it the appearance of floating over the background. Blur: Takes the subject out of focus, making it look smudged or out of the depth of field. Glow: Creates a faint glowing outline around an object by following its curves. Bevel: Gives an object a 3D look by creating shadows and highlights on opposite edges. Gradient Glow: Quite similar to the Glow filter, except that the glow follows a gradient of colors from the inside to the outside edges of the object. Gradient Bevel: Comparable to the Bevel filter, except that a gradient is applied to the shadow and the highlights of the bevel. Adjust Color: Allows you to adjust the brightness, contrast, hue, and saturation of an object.

This file contains color and font information, as well as a few other items. If the configuration file is found, it is sourced to put its contents into effect in the current shell environment. If the configuration file does not exist, the script creates it using the heredocument technique and populates a new configuration file using default values. Then the script has to source the newly created file. The configuration file is located in the user s home directory so that each user can make his own customizations. The CONNECTION_TYPE variable in the following code snippet specifies the type of connection the user would like to have as the preferred method of attaching to a remote system. The connection types include ssh, rlogin, and telnet, among others.

There are also three filters that can be applied only through the use of ActionScript: Color Matrix, Displacement Map, and Convolution. Their use is out of the scope of this book, but check out the ActionScript dictionary in the Help menu for explanations and demonstrations of how to use these filters.

If the selected FilterType property is Custom, FilterMode can be either InvalidChars or ValidChars. Type of filter to be applied to the target TextBox (can be more than one value separated by a comma). Potential values are Numbers, LowercaseLetters, UppercaseLetters, and Custom. When FilterType is set to Custom, and FilterMode is set to InvalidChars, this property can contain a list of all invalid characters. ID of the target TextBox control. When FilterType is set to Custom, and FilterMode is set to ValidChars, this property can contain a list of all valid characters.

Before you start playing with them, understand filters can t be applied to everything you see on the Flash stage. Filters can be applied only to buttons, text, and movie clips. This makes a lot of sense because the bulk of the movie clips that will receive a filter arrive in the Library as either bitmaps from Photoshop and Fireworks or line art from Illustrator. As you saw in 2, they inevitably get imported as movie clip symbols. Even neater is, if an imported image has transparent areas, the filter such as a Drop Shadow is applied only to the opaque edges of the symbol.

In Flash, you can apply filters using a couple of methods. The most common is to select the object on the stage and then click the Filters twirlie on the Properties panel. Filters can also be applied through ActionScript. To get started, let s get creative with a simple drop shadow:

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