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DEFINING TAGS
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The usual procedure is that the tag handler retrieves a scripting variable, performs some processing on the object, and then sets the scripting variable s value using the method The scope that an object can have is summarized in Table 13 4 The scope constrains the accessibility and lifetime of the object Table 13 4 Scope of Objects
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Name Accessible From Lifetime
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Until the response has been sent back to the user or the request is passed to a new page Until the response has been sent back to the user
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Providing Information about the Scripting Variable
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The example described in Tags That Define Scripting Variables, page (287) defines a scripting variable that is used for accessing book information:
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When the JSP page containing this tag is translated, the Web container generates code to synchronize the scripting variable with the object referenced by the vari-
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Current page Current page and any included or forwarded pages Current request and any subsequent request from the same browser (subject to session lifetime) Current and any future request from the same Web application
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able To generate the code, the Web container requires certain information about the scripting variable: Variable name Variable class Whether the variable refers to a new or existing object The availability of the variable
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There are two ways to provide this information: by specifying the TLD subelement or by defining a tag extra info class and including the element in the TLD Using the element is simpler, but slightly less flexible variable Element element has the following subelements: The
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Value
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Methods
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DEFINING TAGS
Table 13 5 Scripting Variable Availability (Continued)
Value Availability
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Methods
The implementation of the Struts tag conforms to the JSP specification version 11, which requires you to define a tag extra info class The JSP element You could define the folspecification version 12 adds the lowing element for the tag:
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TagExtraInfo Class You define a tag extra info class by extending the class A must implement the method to return an array of objects containing the following information: Variable name Variable class Whether the variable refers to a new object The availability of the variable