Hi all,
i've created a SSCCE to illustrate my problem:
'I would expect to get an alert if an empty string is entered as it does not
meet the constraint.'
It is available at
http://phobos103.inf.uni-konstanz.de/xforms/constraint.xml
Here is the source:
<?xml version="1.0" encoding="iso-8859-1"?>
<?xml-stylesheet href="xsltforms/xsltforms.xsl" type="text/xsl"?>
<?xsltforms-options debug="yes"?>
<html xmlns="http://www.w3.org/1999/xhtml";
xmlns:h="http://www.w3.org/1999/xhtml";
xmlns:xf="http://www.w3.org/2002/xforms";
xmlns:ev="http://www.w3.org/2001/xml-events";
xmlns:xsd="http://www.w3.org/2001/XMLSchema";
>
<head>
<title>Constraint</title>
<style type="text/css">
body { font-family: sans-serif}
label { display: inline-block; width: 16em; margin: 2em 2em;
text-align: right }
</style>
<model xmlns="http://www.w3.org/2002/xforms";>
<instance><data xmlns="">
<name/>
</data>
</instance>
<bind nodeset="name" constraint="string-length(.) > 2"/>
</model>
</head>
<body>
<group xmlns="http://www.w3.org/2002/xforms";>
<input ref="name" incremental='true'>
<label>String with length > 2:</label>
<alert>String must have more than two characters</alert>
</input>
</group>
<hr/>
<div>
Constraint works, but I would expected to also see an alert if 'empty'
string has been reached:
<pre>
input: '' -> no alert (why?)
input: 'a' -> alert (OK)
input: 'aa' -> alert (OK)
input: 'aaa' -> no alert (OK)
input: 'aa' -> alert (OK)
input: 'a' -> alert (OK)
input: '' -> no alert (why? constraint string-length(.) > 2 is not
fulfilled)
</pre>
</div>
</body>
</html>
Thanks,
Alex
> On Thu, Jan 17, 2013 at 3:57 AM, Alexander Holupirek <[email protected]>
> wrote:
> Hi list,
>
> I have a constraint problem.
>
> I use this bind:
>
> <xf:bind id="bind_xxx" nodeset="instance('inst_xxx')/xxx"
> required="true()" constraint="string-length(.) > 1"/>
>
> It works quite well in the following cases:
>
> * If I have an input of string-length(.) = 1, <xf:alert/> labels show up,
> good.
> * As soon as string-length(.) is greater than one, they go away, good.
>
> Problem:
>
> * If I have string-length(.) = 0, no <xf:alert/> labels show up, which is
> unexpected.
>
> What is working as expected, is that I can not submit data (as it obviously
> does not fulfill the constraint).
> But since no alert message is shown, I am not able to provide feedback about
> the missing value to the user.
>
> Do you have any clue, what is happening here?
>
> Thanks,
> Alex
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