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From Rahul P Akolkar <>
Subject Re: Dynamically adding components to pages
Date Tue, 31 May 2005 19:31:12 GMT
"Marius Botha" <> wrote on 05/31/2005 06:43:33 AM:
> I have a requirement where my system needs to prompt users for certain
> information at certain times in a process. To do this I need to be able 
> add components to a page at run time based on a user's permissions. E.g. 
> the user is supposed to specify a date for the process to continue, I 
> to provide a calendar control; and if the user needs to enter a name, 
> provide a textbox. <snip/>

Sounds more like task dependent choices rather than user dependent ones. I 
guess thats an aside.

> I have developed my own custom tags that I would want to
> use but I have the following questions:
> 1. How do I reuse my components in such an environment? I suppose I 
> need to provide a StringBuffer or something to my component to write to
> (how?) and then call the doStartTag(), etc. methods manually? <snip/>

Playing container is not a good thing.

> 2. How do I implement this in the JSP, seeing as the html/tags would 
have to
> be inserted at a certain stage. Has anyone done this before or can you 
> me any pointers?<snip/>

Can you use JSP 2.0 (if you're not already)? Tag files will give you the 
reuse you're talking about. Write a tag (as a .tag impl) that takes the 
task (or user) name as an attribute, and produces the appropriate controls 
(+ other presentation layer stuff around them). You can (re)use the custom 
tags you wrote in this tag file.


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