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how do I truncate variable output data from the page side?

I want to truncate the amount of data displayed from the output of a variable using a control on the jsp page.
For example, if the following statement is a string with a value of up to 512 characters:
If <c:out value="${bigField.content}" /> = Now is the time for all good men to come to the aid of their country.
I would like to use some JSP page side control to limit the output to say 20 characters and an ellipsis (...)
so the result would be something similar to:
<fmt:format??? valuevalue="${bigField.content}" display="20" /> = Now is the time for ...
I don't want to do this from the server side because I want the "page designer" to be able to control the amount of data that is displayed.

1 Solution
Are you using JSTL 1.0 or 1.1?

If you are using 1.1 then you can use the fn/function library to substring the variable if it has a length of greater than 512 characters.
Weiping DuSenior Web DeveloperCommented:
If you only want to do this in client side, you may use Javascript to control it. try this:

<script language="javascript">

var str = <c:out value="${bigField.content}" />
if(str.length > 512){
    str = str.substring(0, 20) + "...";

    document.write("<FONT COLOR=\"RED\">");
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