component-less rendering

[Terrence Brannon]

In the Presentation Tier docs, we see a number of examples of using xhmlt.Renderer() without any component. Motivated by this,

I am attempting to create a renderer for my mixin. That is to say, I

mixin a number of classes into a class and then when I render the

class, I want to render its mixins using each mixins rendeing method. 

Here is the code for one such mixin:

class ValueTyped(object):

    def __init__(self):

        super(ValueTyped, self).__init__()

        self.value_type = ''

    def valuetyped_render(self, editor):

        id_type = {

            '25': 'Timestamp with Jiffies',

            '26': 'Timestamp',

            '32': 'Date'

        }

        h = xhtml.Renderer()

        tp("H..: {0}".format(h))

        tp("H.S: {0}".format(h.select))

        hsr = h.select.renderer

        tp("HSR: {0}".format(hsr))

        hsrc = h.select.renderer.component()

        tp("HSRC {0}".format(hsrc))

        tp("E..: {0}".format(editor))

        tp("EVT: {0}".format(editor.value_type))

        with h.select.action(editor.value_type):

            with h.optgroup(label='xxx'):

                for id,type in id_type.iteritems():

                    h << h.option(type, value=type)

        tp("Returning H_ROOT: {0}".format(h.root))

        return h.root

Now, the problem is that the code breaks on the source line:

   with h.select.action(editor.value_type):

because nagare.namespaces.action() has this line:

   action = security.wrapper(action, permissions, subject or self.renderer.component())

And the part of that line that fails is `self.renderer.component())`

So my question is: 

1. is it wrong for one to create a renderer and not bind a component

to it? 

2. If a renderer needs a component, how will it get one? I attempted

to pass in the component that called this method and that was not

acceptable to lxml because a node realized that it's child was itself.

[Sylvain Prat]

Hi,

The philosophy of Nagare is to use components and views, so that you can reuse components & views in different contexts, or wrap them into bigger ones. The presentation tier documentation just illustrates how to use the renderer to create HTML markup in a view of a component. It does not suggest to use the renderer without components. The error you see is because Nagare attaches the callbacks to their underlying component. 

Sylvain 

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Sylvain PRAT
+33 06 78 71 51 21