Renderer and encodeChildren

[Mario Ivankovits <ma...@ops.co.at>]

Hi!

In JSF 1.1 I am curious about the javax.faces.renderer.Renderer class in
JSF 1.1, in particular the following piece of code:

    public void encodeChildren(FacesContext context,
                               UIComponent component)
            throws IOException
    {
        if (context == null) throw new NullPointerException("context");
        if (component == null) throw new NullPointerException("component");
       
        List children = component.getChildren();
        for (int i=0; i<children.size(); i++)
        {
            UIComponent child = (UIComponent) children.get(i);
           
            if (!child.isRendered())
            {
                continue;
            }

            child.encodeBegin(context);
            if (child.getRendersChildren())
            {
                child.encodeChildren(context);
            }
            child.encodeEnd(context);
        }
    }


I wonder WHEN are the children rendered if the component returns false
on getRendersChildren here.
And how/why does it work when mixing things, lets say you have
t:div/h:panelGroup/t:div
where t:div returns false on getRendersChildren() and h:panelGroup
returns true.

Is there a simple answer to this?

Ciao,
Mario

Re: Renderer and encodeChildren

[Mario Ivankovits <ma...@ops.co.at>]

Hi!
> if getRendersChildren() returns fals, the JSP-tag will call encodeChildren().
>   
I still wonder how the mixing of rendersChildren true/false/true/false
is going to work, but I've seen the code in >JSF1.1 is much easier so I
am not going to spend any more time on this topic.

Thanks!

Ciao,
Mario

Re: Renderer and encodeChildren

[Martin Marinschek <ma...@gmail.com>]

Hi Mario,

if getRendersChildren() returns fals, the JSP-tag will call encodeChildren().

regards,

Martin

On 10/24/07, Mario Ivankovits <ma...@ops.co.at> wrote:
> Hi!
>
> In JSF 1.1 I am curious about the javax.faces.renderer.Renderer class in
> JSF 1.1, in particular the following piece of code:
>
>     public void encodeChildren(FacesContext context,
>                                UIComponent component)
>             throws IOException
>     {
>         if (context == null) throw new NullPointerException("context");
>         if (component == null) throw new NullPointerException("component");
>
>         List children = component.getChildren();
>         for (int i=0; i<children.size(); i++)
>         {
>             UIComponent child = (UIComponent) children.get(i);
>
>             if (!child.isRendered())
>             {
>                 continue;
>             }
>
>             child.encodeBegin(context);
>             if (child.getRendersChildren())
>             {
>                 child.encodeChildren(context);
>             }
>             child.encodeEnd(context);
>         }
>     }
>
>
> I wonder WHEN are the children rendered if the component returns false
> on getRendersChildren here.
> And how/why does it work when mixing things, lets say you have
> t:div/h:panelGroup/t:div
> where t:div returns false on getRendersChildren() and h:panelGroup
> returns true.
>
> Is there a simple answer to this?
>
> Ciao,
> Mario
>
>


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Re: Renderer and encodeChildren

[Sochor Zdeněk <zd...@ataco.cz>]

Hi,
  as to why does it work, the answer should be simple - almost all 
renderers in MyFaces  do ALL encoding work  in encodeEnd method 
(including rendering children).

But what do i wonder more is why page's component tree contains ALL 
previously rendered/encoded components.
Wouldn't it make sense to remove non-rendered components from it?
I came across this issue when discussing topic: "TabbedPane does not 
validate non-selected tabs in server side tab switching mode (Relaed to 
TOMAHAWK-1012 <https://issues.apache.org/jira/browse/TOMAHAWK-1012>)."

Best regards,
  Zdenek

Mario Ivankovits napsal(a):
> Hi!
>
> In JSF 1.1 I am curious about the javax.faces.renderer.Renderer class in
> JSF 1.1, in particular the following piece of code:
>
>     public void encodeChildren(FacesContext context,
>                                UIComponent component)
>             throws IOException
>     {
>         if (context == null) throw new NullPointerException("context");
>         if (component == null) throw new NullPointerException("component");
>        
>         List children = component.getChildren();
>         for (int i=0; i<children.size(); i++)
>         {
>             UIComponent child = (UIComponent) children.get(i);
>            
>             if (!child.isRendered())
>             {
>                 continue;
>             }
>
>             child.encodeBegin(context);
>             if (child.getRendersChildren())
>             {
>                 child.encodeChildren(context);
>             }
>             child.encodeEnd(context);
>         }
>     }
>
>
> I wonder WHEN are the children rendered if the component returns false
> on getRendersChildren here.
> And how/why does it work when mixing things, lets say you have
> t:div/h:panelGroup/t:div
> where t:div returns false on getRendersChildren() and h:panelGroup
> returns true.
>
> Is there a simple answer to this?
>
> Ciao,
> Mario
>
>
>