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Editorial Team
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Asked: 2026-06-16T06:52:43+00:00

I have a basic Java Tag (called PluginTag), which extends TagSupport. This tag adds

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I have a basic Java Tag (called PluginTag), which extends TagSupport. This tag adds some behaviour to the calling JSP using the JspWriter instance, e.g.

    this.pageContext.setAttribute("plugins", someBehaviour);

I would like to extend this tag, so that it injects HTML meta data into HEAD of the html document. So as explained, the tag has a JspWriter, and not much else…

Also, by the time PluginTag is invoked, another tag will have written the HEAD and any META data out. The trick is I cant update this tag to do my work – and in any case would like the PluginTag to handle my META data, if possible.

I seen a few things like apache HtmlElement, but dont think they are applicable from the context of a Tag.

Thanks.

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1 Answer

  1. Editorial Team

    It’s impossible to access HTML document which is formed outside the custom tag. The reason is that previously formed HTML could have been flushed to the user-agent already while other has not been formed yet.

    Another way to change shipped to the client and rendered HTML document is to use a custom tag which includes some JavaScript that changes the needed HTML-document elements.

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