Why does CClientScript use recordAction()?

Yii 1.1 General Discussion
1

I’m working in a custom clientscript component. Therefore i looked at the source of CClientScript and found, that all register*() calls get recorded by the cache. For example:





    public function registerCssFile($url,$media='')

    {

        $this->hasScripts=true;

        $this->cssFiles[$url]=$media;

        $params=func_get_args();

        $this->recordCachingAction('clientScript','registerCssFile',$params);

        return $this;

    }

That means, these methods are replayed, even if a cached version of a page is found. From COutputCache:




    public function init()

    {

        if($this->getIsContentCached())

            $this->replayActions();

        [ ... ]


    }

I don’t really understand, what this is for. As i see it, the cached page content should already have the JS + CSS inserted, because the script tags get inserted before the page is cached. Or am i wrong here?

The only reason i could think of, is, to make sure, that any assets are published again, in case someone cleared the assets folder.

Can someone explain, why these methods are recorded?

2

This is mainly used when fragment cache is in effect.

For example, if you cache a partial view in which you register some scripts, then when the cached version is rendered, the scripts will still be registered.

3

That makes sense, thanks Qiang.

But it’s also in effect when page caching is used, right? So it adds some redundancy?