Thanks it works. Also i found another way around it.
Just love JSTL
----- Original Message -----
From: "Pierre Delisle" <[EMAIL PROTECTED]>
To: "Tag Libraries Users List" <[EMAIL PROTECTED]>
Sent: Monday, February 24, 2003 8:57 PM
Subject: Re: fmt:parseNumber
>
>
> Eddie Barna wrote:
> > I thought it would be fun to use JSTL for some form validation instead
of Javascript. I am trying to make sure a user only enters numbers in a
field called AcctNum. Also i decided to use <fmt:parseNumber /> to test my
field. Here's the code:
> >
> > <c:catch var="parsingError">
> >
> > <fmt:parseNumber var="Gotcha" value="${param.AcctNum}"/>
> >
> > </c:catch>
> >
> > <c:if test="${Gotcha != param.AcctNum}" var="noMatch"/>
> >
> >
> >
> > Now here's where i run into problems. if i input a string followed by
numbers such as iu789 then my catch statement catches the error and stores
the following statement in in my variable:
> >
> > javax.servlet.jsp.JspException: In <parseNumber>, value attribute
can not be parsed: "iu789"
> >
> > This good. Thats what i am trying to do.
> >
> > Now if i input something like this: 45678uy78 or number followed by a
string such as this: 89087yht then the whole page craps out on me and i get
this error from the server:
> >
> > org.apache.jasper.JasperException: javax.servlet.jsp.JspException: An
error occurred while evaluating custom action attribute "test" with value
"${Gotcha == param.AcctNum}": An exception occured trying to convert String
"45678uy78" to type "java.lang.Long" (null) at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:2
48)
> >
> > My understanding is that my catch statement is supposed to catch this
also but it doesn't. Am I missing something here guys? Please be gentle
since i am a novice. TIA
> >
>
> Here is what happens:
>
> - The parsing of "45678uy78" yields the number 45678.
> I agree this is weird, but that's the behavior of NumberFormat.parse().
> [Sorry haven't had the time to dig further in the javadocs to explain
why it
> would not
> throw an exception if you have digits followed by non-digits, but
that's
> the way it is if no pattern is specified :-(]
>
> - The expression 45678 != "45678uy78" triggers the conversion of
> "45678uy78" to a Long and fails (see section A.3.6.2 of the spec).
>
>
> You'd therefore want to insert your conditional tag inside the c:catch.
>
> <c:catch var="parsingError">
> <fmt:parseNumber var="Gotcha" value="${param.AcctNum}"/>
> <c:if test="${Gotcha != param.AcctNum}" var="noMatch"/>
> </c:catch>
>
> <c:if test="!empty parsingError">
> invalid input
> ...
> </c:if>
>
> <!-- if I get here, input is valid -->
> ...
>
>
> -- Pierre
>
>
>
>
>
>
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