[PHPTAL] Imploding tal:attributesfrom source array

[Kornel Lesinski]

On 29 Jan 2008, at 07:10, Werner wrote:

> Unfortunately this does not seem to work. It seems that there needs  
> to be at least one attribute key to be specified before the  
> attribute's value will be rendered.
>
> E.g. if you use:
>    <img tal:attributes="${imgAttr}" />
> You get:
>    <img/>
>
> I ony can get something rendered if I specify an attribute name:
>    <img tal:attributes="myattrs ${imgAttr}" />
> You get:
>    <img myattrs=" id some_id; class some_class; src img/ 
> beautiful.jpg;"/>
>
> Why is this so hard? One would almost expect tal:attributes to be  
> able to handle any assoc array right there in place? E.g.
>    <img tal:attributes="${myAssocArray}" />

This particular construct doesn't work, because conents of  
tal:attributes is parsed (analyzed) and compiled only once.

It is possible to extend TAL/PHPTAL to support variable number of  
attributes, just nobody did that yet :)

> I guess this is not the intended way, eh? The only alternative  
> seems to be to write a very long tal:attributes definition that  
> would cater for any possible attribute, but I;m sure there must be  
> a better approach...?


Nope, AFAIK that's the TAL's "right" way:
<img tal:attributes="src imgAttr/src | nothing; class imAttr/class |  
nothing; etc..." />

You can put it in a macro to avoid repeating it.

I've attached a patch (apply with: cd /your/phptal/dir/; patch -p0 < / 
path/to/nullAttrs.patch) that makes 'nothing' keyword omit attribute  
entirely (so you won't get class="" if image has no class name). I'll  
make it part of official distribution later.

Alternatively you can construct entire tag using PHP:
${structure php:makeImgHTML(imgAttr)}

-- 
regards, Kornel

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