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Other Validators
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In addition to the validators mentioned previously, ASP .NET includes three other validators: the RangeValidator, the CustomValidator, and the DynamicValidator . This section takes a quick look at each . The RangeValidator is similar to the CompareValidator in that you can use it to check the data in a control against a value . However, the purpose of the RangeValidator is to report an error if the data held in a control is out of a range . The validator specifies a minimum and a maximum value and reports an error if the value in the control falls outside these thresholds . You can try to fit any other kind of validation you might encounter into the CustomValidator . The CustomValidator fits on the page in the same way the other validators do . However,
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Part I Fundamentals
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rather than predefining validation methods (on the server and in the client script), these pieces are left open . When you put a CustomValidator on a page, you assign it an associated control . Then, you refer to a validation function (that you write into the page) . You can also specify a validation script block to be shipped to the client and run along with the other client-side validation script . Finally, ASP .NET includes a new validator to support its Dynamic Data model: the DynamicValidator . You learn more about Dynamic Data in 20, Dynamic Data . The ASP .NET Dynamic Data model supports data-driven application development . The DynamicValidator control catches any exceptions thrown during data binding and validation, forwarding the exception as a validation event on the Web page .
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Validator Properties
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You can see that validator controls contain the standard properties available to the other standard ASP .NET controls . For example, there s a Text property, a Font property, and various coloring properties . In addition, a couple of other properties useful for managing the error output sent to the browser are available . The value of the Display property can be either static or dynamic . This property manages the client-side rendering of the error message . Static (the default value) causes the span element emitted by the control to take up layout space in the HTML bound for the client, even when hidden . When the Display property is Dynamic, the span element emitted by the control changes the layout and dynamically expands when displayed . ASP .NET has the ability to group validation controls . That is, each validation control can belong to a named group . The ValidationGroup property controls the name of the group . When a control belongs to a group, controls in that group validate only when one of the other validators in the group fires . This gives you a multiple forms effect in a single page . The following sections look at a few other interesting controls: the Image control and image-based controls, the TreeView control, and the MultiView control .
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Graphic images are often used in Web pages . HTML includes an image tag that tells the browser to fetch an image file (for example, a .gif, .jpg, or .png file) and display it . When you need to set an image on a page, the HTML <img /> tag is the one to use . Naturally, ASP .NET wraps the <img /> tag using a server-side control the Image control . Using the Image control is fairly straightforward . You select it in the Toolbox like any other control and drop it on the page . The ASP .NET Image control generates an <img /> tag complete with the correct src attribute .
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