How to bind output value into model

Question

I've got this binding to the output field:

 <xf:bind id="fr-form-binds" ref="instance('fr-form-instance')">
        <xf:bind id="Pokoj-bind" ref="dok:Pokoj" name="Pokoj" />
    </xf:bind>
     <xh:body>
    <xh:td>
      <xf:output id="Pokoj-control" value="concat('Pokój ',xxf:repeat-position())"
                                               bind="Pokoj-bind">
         <xf:label ref="$form-resources/Pokoj/label"/>
         <xf:hint ref="$form-resources/Pokoj/hint"/>
         <xf:alert ref="$fr-resources/detail/labels/alert"/>
      </xf:output>
    </xh:td>
   </xh:body>

but value of the output it's not saved to the model I would be grateful for any kind of help how to bind value of this to the model.

Answer 1

Unlike an xf:input that can also "write" a value to its bound node, say when users change the value in the input field, an xf:output just reads a value from its bound node, or shows a value coming from the value="..." attribute, as you did here. But the fact that you have a bind="..." on the xf:output in addition to the value="..." doesn't get the xf:output to write that value into the bound node.

Typically, you would achieve this by moving expression you now have on the xf:output value="..." to an xf:bind calculate="...". In your case, you can't do exactly that, as the xxf:repeat-position() won't work in the model. So you'll most likely need to write something like calculate="concat('Pokój ',count(preceding-sibling::dok:Pokoj))".