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jspjsp-tags

EL expression in custom tag parameter name

I created custom tag for encoding and rewriting URLs with dynamic parameters. For ex.:

<mytags:outUrl url="${value1}" id="${value2}" />

works as expected (url is standard parameter and id is first dynamic parameter).

Is it possible to also have dynamic parameter names like this directly?

<mytags:outUrl url="${var1}" ${name1}="${var2}" />

I know it is possible to use <jsp:attribute> but it is too much code:

<mytags:outUrl url="${var1}"><jsp:attribute name="${name1}">${var2}</jsp:attribute></mytags:outUrl>
Solution

  • You're reinventing the JSTL, which already has a standard tag to do that:

    <c:url value="${someUrl}">
    <c:param name="${someName}" value="${someValue}"/>
    <c:param name="${someOtherName}" value="${someOtherValue}"/>
</c:url>

    To answer your question: no, the syntax you propose isn't supported. The closest to what you're suggesting is dynamic attributes. See http://www.javabeat.net/2009/02/dynamic-attributes-in-tag-file-in-jsp-2-0/ and http://www.coderanch.com/t/170429/java-Web-Component-SCWCD/certification/Tutorial-Dynamic-Attributes for examples.