Form validation

[Paul Pattison <pa...@76design.com>]

I was looking at the Form Validation sample today and I found that there was
a little more code in the xsp page then I would like.

I'm trying to find a way to get the if-else if statements out of the page
and put them into the action instead.  Here's what I came up with.  I tried
to put the needed error message into the descriptor file.

I haven't tried writing the action yet, I thought I'd see what people
thought of this way of doing it.  I've included code below.  Is it possible
this way?  Is it a good way of doing it?

Any comments greatly appreciated,

Paul


Here's what my descriptor file would look like:

<?xml version="1.0"?>
<root>
  <parameter name="persons" type="long" default="4" nullable="yes">
    <constraint name="min" value="2">
      <err-msg>The smallest available car seats 2.</err-msg>
    </constraint>
    <constraint name="max" value="7">
      <err-msg>The largest available car seats 7.</err-msg>
    </constraint>
  </parameter>

  <parameter name="deposit" type="double">
    <constraint name="min" value="10.0">
      <err-msg>The deposit has to be at least EUR 10.00.</err-msg>
    </constraint>
    <constraint name="max" value="999.99">
      <err-msg>The deposit has to be at most EUR 999.99.</err-msg>
    </constraint>
  </parameter>

  <constraint-set name="car-reservation">
    <validate name="persons"/>
    <validate name="deposit"/>
  </constraint-set>
</root>


Here's a snippet from the xsp file:

<xsp:page>
  ...
  How many persons should the car seat?
  <input type="text" name="persons" size="2">
    <xsp:attribute name="value"><xsp-request:get-parameter name="persons"
default=""/></xsp:attribute>
  </input>
  <error>
    <xsp-request:get-parameter name="persons-err"/>
  </error>
  ...
</xsp:page>


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Re: Form validation

[Christian Haul <ha...@dvs1.informatik.tu-darmstadt.de>]

There is new foms support underway for cocoon using an XForms related
syntax. FormvalidatorAction will stay but large additions might not be
worthwile.... 

On 14.May.2002 -- 08:59 PM, Paul Pattison wrote:
> I'm trying to find a way to get the if-else if statements out of the page
> and put them into the action instead.  Here's what I came up with.  I tried
> to put the needed error message into the descriptor file.

The formval logicsheet features "on-XYZ" tags, which are evaluated
only, if condition XYZ is true.

> I haven't tried writing the action yet, I thought I'd see what people
> thought of this way of doing it.  I've included code below.  Is it possible
> this way?  Is it a good way of doing it?

Internationalization would be more difficult to achieve this way.

Besides, I like to use the formval logicsheet as a building block for
my own custom logicsheet. E.g. I like red stars behind a field that is
required or does not conform with the expected format. For this I use

 <dvs-form:input type="checkbox" name="os" value="macosX"/> MacOS X<br/>

and 

  <xsl:template match="dvs-form:input">
      <input>
        <xsl:for-each select="@*">
          <xsl:copy>
            <xsl:apply-templates/>
          </xsl:copy>
        </xsl:for-each>
        <xsp:attribute name="value">
          <xsp-request:get-parameter>
            <xsl:attribute name="name"><xsl:value-of select="@name"/></xsl:attribute>
            <xsl:attribute name="default"><xsl:value-of select="@default"/></xsl:attribute>
          </xsp-request:get-parameter>
        </xsp:attribute>
      </input>
      <xsp-formval:on-error>
        <xsl:attribute name="name"><xsl:value-of select="@name"/></xsl:attribute>
        <font color="red">*</font>
      </xsp-formval:on-error>
  </xsl:template>

HTH

	Chris.

-- 
C h r i s t i a n       H a u l
haul@informatik.tu-darmstadt.de
    fingerprint: 99B0 1D9D 7919 644A 4837  7D73 FEF9 6856 335A 9E08

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