Re: an expression to check if a parameter is a non-zer

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Subject: Re: an expression to check if a parameter is a non-zero number - comments
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Thu, 30 Oct 2003 14:09:02 -0500

Abhishek,

At 01:33 PM 10/30/2003, you wrote:

<xsl:when
test="true(string-length(translate($ImageWidth,'0123456789.','')) = 0
and $ImageWidth != 0)">

I want to check if the incoming parameter ImageWidth is a non-zero
number.

I am wondering it the above expression would work?

Take it out of the spurious true() function, and it should, but....

(There is a function true() but it doesn't take any arguments, it simply returns the Boolean value "true").

Is there a better way to do that checking ?

Try test="number($ImageWidth)"

If $ImageWidth is a number, it'll test as true unless its value is 0.

If $ImageWidth is a string, it'll be turned into a number by the number() function, and test as true unless it is 0 or NaN ("not-a-number").

If $ImageWidth is a node-set, the first node in it will be converted into a string, and test as above. Same if it's a result-tree-fragment.

If $ImageWidth is a Boolean, it'll be true if it's true, false if not.

Cheers,
Wendell


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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
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Current Thread
an expression to check if a parameter is a non-zero number - comments SANWAL, ABHISHEK (HP-Houston) - Thu, 30 Oct 2003 13:34:32 -0500 (EST) Michael Kay - Thu, 30 Oct 2003 14:06:15 -0500 (EST) Dimitre Novatchev - Thu, 30 Oct 2003 14:09:05 -0500 (EST) Wendell Piez - Thu, 30 Oct 2003 14:15:08 -0500 (EST) <= <Possible follow-ups> Passin, Tom - Thu, 30 Oct 2003 14:03:32 -0500 (EST)

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