Download e-book for kindle: JSTL in Action by Shawn Bayern

By Shawn Bayern

ISBN-10: 1930110529

ISBN-13: 9781930110526

JSTL is a crucial simplification of the Java net platform. With JSTL, web page authors can now write dynamic pages utilizing average HTML-like tags and an easy-to-learn expression language. JSTL is a typical from the Java group strategy, and its expression language becomes a part of JSP 2.0. JSTL in motion indicates you the way to write down wealthy, dynamic web content with no programming. From uncomplicated loops to difficult XML processing, each characteristic of JSTL is roofed and exercised in several precious examples. even if you're a amateur web page writer or an skilled Java programmer, this e-book exhibits you effortless how one can create strong websites.

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Extra info for JSTL in Action

Example text

Info XPath variables and JSTL 147 Therefore, //p is true if it is applied to a document that has at least one

element, and it’s false if the document has no

elements. NOTE XPath expressions are more flexible than I’ve shown here. For instance, they can also call functions that directly return numeric values, boolean values, and so on. XPath also provides general rules for converting between numbers, booleans, and other types of data. Details about XPath data types are beyond the scope of this book because they’re not needed to use JSTL; see appendix D for references to more information.

XPath takes advantage of our familiarity with traditional filenames, applying a similar syntax to the tree representing an XML document. If you have three directories on your disk—a, b, and c—and you are running Windows, you can refer to these directories as follows: c:\a\b\c Note how the backslash character (\) is used to separate the directory names. Unix systems use the regular slash (/) character in a similar capacity: /a/b/c XPath adopts this Unix convention, using the slash character to separate the name of one XML element from another.

For instance, once you’ve stored the output of a transformation using var, the output can be used as input to another tag. Or, you can select portions from the resulting document using XPath and . 1, the listing’s JSP page then outputs simply HTML—the string value of the second tag in the resulting document. Instead of passing $doc2 to the tag, we could have passed it to another tag. xml) is added by the XSLT processor that’s used behind the scenes to perform the transformation.

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JSTL in Action by Shawn Bayern

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