constraints on values entered in xforms

[boneill]

Hi All,

Can anyone tell me how to limit the number of characters a user can enter when using a xs:normalizedString.  On a broader topic is there a generic way to add a constraint to the values entered for an xform field.

Regards

[pmonks]

XML Schema has a reasonably rich constraint vocabulary, which can be used to do this kind of thing (see http://www.w3schools.com/schema/schema_facets.asp, for example).  For controlling the minimum and maximum lengths of string values, try the "minLength" and "maxLength" facets.

Cheers,
Peter

[boneill]

Thanks Peter,  I did some work on this and got it to work.  I post the examples below in case anyone else needs to get this working and has limited experience in xforms & annotataions like myself:


Constrain a user field to 20 characters and display error message in message pain if this is violated on form submission:

<xs:simpleType name="string20">
     <xs:restriction base="xs:normalizedString">
       <xs:maxLength value="20"></xs:maxLength>
     </xs:restriction>
</xs:simpleType>

<xs:element name="title" type="hp:string20" default="" minOccurs="1" maxOccurs="1">
       <xs:annotation>
   <xs:appinfo>
                <alf:alert>Title required (max length 20 characters).</alf:alert>
               </xs:appinfo>
        </xs:annotation>            
</xs:element>

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Another example constraint is shown using the anyURI .  The file picker will open in the finance products folder (finance products folder is at /Root/finance products).  Also constrained so that only html pages are opened.

In the xform schema

<xs:element name="link_to" type="xs:anyURI">
        <xs:annotation>
             <xs:appinfo>
                <alf:appearance>folder_restricted_file_picker_finance_products</alf:appearance>
             </xs:appinfo>
         </xs:annotation>
</xs:element>

in the  web-client-config-wcm.xml file:

<!– File Picker for the Homes Page Finance Product pages –> 
<widget xforms-type="xf:upload" appearance="folder_restricted_file_picker_finance_products"
                   javascript-class-name="alfresco.xforms.FilePicker">
             <param name="selectable_types">wcm:avmcontent,wcm:avmfolder</param> 
       <param name="filter_mimetypes">text/html</param>
             <param name="folder_restriction">finance products</param>  
</widget>
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Hope this is useful to someone.