take a look at inputevents in wicketstuff, it uses the javascript
template james mention..

2010/5/7 Anthony DePalma <fatef...@gmail.com>:
> I recently developed a component that can be added to any form to put
> a character countdown div next to any textarea. Just for some
> background, the component constructor is:
> CharacterCountdownPanel(String id, TextArea textArea, int charLimit).
>
> The textarea is necessary because the countdown panel needs to know
> the id of the generated markup (Although while typing this, I realize
> it might be useful for textfields as well, so that may change). But
> one issue I often encounter with components like these is the need to
> generate highly dynamic javascript, and I really dislike mixing up
> java string concatenation with multiline js functions.
>
> Does anyone do anything to reduce this language mismatch? One idea I
> had was to pull the entire javascript function into its own file, and
> use something similar to Wicket's property file handling, and have a
> model pull all the dynamic values into the script. I could use a
> regular property file, but I don't know if it makes sense to put the
> entire js function as a single property in one giant line. Any
> suggestions?
>
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