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How to get to the custom tags on a page from a scriptlet?

 
Jesper de Jong
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My colleague has an ASPX page that contains server controls (the equivalent of custom tags in a JSP page). In this page, he has a scriptlet (in C#) that looks up one of the server controls on the page by ID, and then calls a method on it. It looks like this:

So, converted to Java / JSP terminology: he has a scriptlet that looks up a custom tag on the page according to its Id attribute, and then calls a method on the tag handler object for that custom tag.

Is something like this possible when using JSPs?

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David Newton
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Ewwwwww.

But as far as I know, this isn't possible: the structure of ASP and JSP pages is different; ASP pages are more component-oriented. It'd probably be possible if you were using a component-based page/tag rendering system, but if it's action-based, probably not. The JSP is rendered into a servlet, which is just making function calls to the tag--you'd have to demangle the tag names/instances, and even then, I don't know if it'd work.
 
Jesper de Jong
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Thanks. Yes, this looked strange to me too, and you probably can't (easily) do the same kind of thing using JSPs. He'll have to find some other way to solve his problem.

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Kris Schneider
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Maybe I'm missing something, but how is this much different than:



I guess the point is to think about using beans instead of tags/actions. Is there a reason for requiring a tag? Of course, servlets and filters are other options...
 
David Newton
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Because a bean isn't a user-interface component.
 
Kris Schneider
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David Newton wrote:Because a bean isn't a user-interface component.



So, if I used the Struts bean tag instead then it would be a UI component?

Edit: Just goes to show how much that response made my eyes cross, because, you know, <jsp:useBean> really is a tag...
 
David Newton
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No, bean tags aren't UI components either.
 
Kris Schneider
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David Newton wrote:No, bean tags aren't UI components either.



Got it - this is a "know 'em when I see 'em kind of thing". So, do we know that <prefix:Query> is more like a bean tag or more like a UI component...however that's defined...
 
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