[TYPO3-mvc] fluid: adding own variables [discussion]

[Bastian Waidelich]

Christian Zenker wrote:

Hi Christian,


> Today was the first day I used Fluid. And let me say - I really love it. 
> It's simple, easy to learn and powerfull.

Glad, that you like it!


> So it would be nice to have an opportunity to create own variables on 
> runtime in the template.

Good that you bring up this topic. I'm just thinking about missing view 
helpers for Fluid & tx_fluid (will open-up a new thread on this one).

We definitely need something like alternating classes. And though it's 
technically no problem, I think we have to find a cleaner way to 
implement this feature because having too much power in you view leads 
to diffusion of the tiers of your extension. Don't get me wrong: In your 
example it's absolutely legitimate as it's only used for presentation 
logic. But I'm sure people would use a register for business/control 
logic soon if we'd provide it as "official" view helper, leading to more 
complex and unmaintainable extensions.

Furthermore your example get's considerably more complex by adding the 
zebra classes.

From:

<ul>
   <f:for each="{0 : 'one', 1 : 'two', 2 : 'three', 3 : 'four'}" 
as="item" key="key">
     <li class="{zebra}">
       {item}
       ...do some more stuff...
     </li>
   </f:for>
</ul>

To:

<ul>
   <f:for each="{0 : 'one', 1 : 'two', 2 : 'three', 3 : 'four'}" 
as="item" key="key">
     <f:register.storage>
       <f:if condition="{key}%2">
         <f:then>
           <f:register.add variables="{'zebra' : 'even', 'foo' : 'bar'}" />
         </f:then>
         <f:else>
           <f:register.add variables="{'zebra' : 'odd', 'foo': 'baz'}" />
         </f:else>
       </f:if>

       <li class="{zebra}">
         {item}
           ...do some more stuff...
       </li>

     </f:register.storage>
   </f:for>
</ul>


To keep a long story short: As Steffen already proposed, we need a 
rotate view helper. Though I'd prefer the name "cycle":

<f:cycle name="zebra" values="{0: 'odd', 1: 'even'}">
   <li class="{zebra}">foo</li>
</f:cycle>

Bastian