Generating table cells based on a "columns" attribute

Hi,

I have the following instance for an XML table:

<xforms:instance id="table-template">
                <table xmlns="">
                    <tgroup cols="">
                        <thead></thead>
                        <tbody></tbody>
                    </tgroup>
                </table>
            </xforms:instance>

<thead> and <tbody> can have a <row> attribute.  <row> can have <entry> for each table cell in the row.  Is it possible to lock the number of <entry> elements within <row> based on the number defined in tgroup/@cols?

For example, I would like to create an "Add Row" trigger that inserts a <row> into <tbody>.  If I define @cols as 4, I'd like "Add Row" to insert <row><entry/><entry/><entry/><entry/></row>, with an input for each <entry/>

Or maybe there is a better way of creating a table?

Thanks,
Ethan


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Ethan,

On Mon, Oct 26, 2009 at 11:40 AM, Ethan Gruber <[hidden email]> wrote:
> For example, I would like to create an "Add Row" trigger that inserts a
> <row> into <tbody>.  If I define @cols as 4, I'd like "Add Row" to insert
> <row><entry/><entry/><entry/><entry/></row>, with an input for each <entry/>

It looks like you need a way to execute an action a given number of
times. In pseudo-code, you could do something like:

<xforms:action xxforms:iterate="for $i in 1 to tgroup/@cols return
xxforms:element('dummy')">
    <xforms:insert context="row" origin="xxforms:element('entry')"/>
</xforms:action>

The 1 to tgroup/@cols returns a sequence of (1, 2, 3, 4) if you have 4
columns, and the xxforms:element() creates an element for each one, as
the context for XPath evaluation is expected to be a node.

Alex
--
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Orbeon's Blog: http://www.orbeon.com/blog/
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Thanks, Alex

I understand the logic now, but there is probably something wrong with my syntax since it is still not working properly.  Here's a clip of what I have (current context is tgroup)
                       <div>
                            <xforms:trigger appearance="minimal">
                                <xforms:label>
                                    <img src="/apps/ead/images/add.gif"/>Add Table
                                    Header</xforms:label>

                             <!-- inserts row into thead: this works -->
                                <xforms:insert ev:event="DOMActivate" context="thead"
                                    origin="instance('row-template')"/>

                             <!-- loop from 1 to @cols to add an entries into the thead/row: does not work -->
                                <xforms:action
                                    xxforms:iterate="for $i in 1 to @cols return
                                    xxforms:element('dummy')">
                                    <xforms:insert context="thead/row" origin="instance('entry-template')"/>
                                </xforms:action>
                            </xforms:trigger>
                        </xforms:group>
                    </div>

                    <xforms:input ref="@cols">
                        <xforms:label>Columns</xforms:label>
                        <xforms:alert>Required</xforms:alert>
                        <xforms:hint>This must be an integer</xforms:hint>
                    </xforms:input>

                    <xforms:group ref="thead/row">
                        <div class="subsection">
                          <!-- this appears -->
                            <h4>Table Header</h4>
                            <xforms:trigger appearance="minimal">
                                <xforms:delete ev:event="DOMActivate" nodeset="."/>
                                <xforms:label>
                                    <img src="/apps/ead/images/remove.gif"/>
                                </xforms:label>
                            </xforms:trigger>

                            <!-- this does not appear -->
                            <xforms:repeat nodeset="entry">
                                <div>
                                    <xforms:input ref=".">
                                        <xforms:label>Cell</xforms:label>
                                    </xforms:input>
                                </div>
                            </xforms:repeat>
                        </div>
                    </xforms:group>

---

What exactly is xxforms:element('dummy')?  Why does something need to be returned?

Thanks,
Ethan




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Ethan,

If my hunch is correct...


'Dummy' is just an arbitrary element returned by xxforms:iterate. Since the value of the xxforms:iterate attribute must be a node/nodeset, the statement:


<xf:action xxforms:iterate="for $i in 1 to 4 return xxforms:element('dummy')">
...
</xf:action>


will return four <dummy/> elements for the xxforms:iterate attribute to iterate over. This is the same as doing:


<xf:instance id="test">
   <data>
      <dummy/>
      <dummy/>
      <dummy/>
      <dummy/>
   </data>
</xf:instance>

...

<xf:group ref="instance('test')">
   <xf:action xxforms:iterate="dummy">
      ...
   </xf:action>
<xf:group>


Hope this helps,

Philip

Ethan Gruber wrote

Thanks, Alex

I understand the logic now, but there is probably something wrong with my
syntax since it is still not working properly.  Here's a clip of what I have
(current context is tgroup)
                       <div>
                            <xforms:trigger appearance="minimal">
                                <xforms:label>
                                    Add
Table
                                    Header</xforms:label>

                             
                                <xforms:insert ev:event="DOMActivate"
context="thead"
                                    origin="instance('row-template')"/>

                             
                                <xforms:action
                                    xxforms:iterate="for $i in 1 to @cols
return
                                    xxforms:element('dummy')">
                                    <xforms:insert context="thead/row"
origin="instance('entry-template')"/>
                                </xforms:action>
                            </xforms:trigger>
                        </xforms:group>
                    </div>

                    <xforms:input ref="@cols">
                        <xforms:label>Columns</xforms:label>
                        <xforms:alert>Required</xforms:alert>
                        <xforms:hint>This must be an integer</xforms:hint>
                    </xforms:input>

                    <xforms:group ref="thead/row">
                        <div class="subsection">
                         
                           

Table Header

                            <xforms:trigger appearance="minimal">
                                <xforms:delete ev:event="DOMActivate"
nodeset="."/>
                                <xforms:label>
                                   
                                </xforms:label>
                            </xforms:trigger>

                           
                            <xforms:repeat nodeset="entry">
                                <div>
                                    <xforms:input ref=".">
                                        <xforms:label>Cell</xforms:label>
                                    </xforms:input>
                                </div>
                            </xforms:repeat>
                        </div>
                    </xforms:group>

---

What exactly is xxforms:element('dummy')?  Why does something need to be
returned?

Thanks,
Ethan

On Mon, Oct 26, 2009 at 9:58 PM, Alessandro Vernet <avernet@orbeon.com>wrote:

> Ethan,
>
> On Mon, Oct 26, 2009 at 11:40 AM, Ethan Gruber <ewg4xuva@gmail.com> wrote:
> > For example, I would like to create an "Add Row" trigger that inserts a
> > <row> into