Rendering nested items with arbitrary depth using Chameleon ZPT
I am using the Pyramid framework and I would like to do with Chameleon an html menu with nested lists (ul, li) of arbitrary depth.
I cannot find any recursive method in Chameleon to do this. There seems to be such a general need, so I am wondering what is the correct way to render nested elements with arbitrary depth?
But maybe some widget menu already available, fully tested and compatible with Pyramid and Chamelon?
<ul metal:define-macro="comment_list">
<li tal:repeat="comment comments" class="comment" comment_id="${comment.id}">
<div>ID: ${comment.id} ${comment.body}</div>
<div tal:define="comments comment.children">
<ul metal:use-macro="template.macros['comment_list']" />
</div>
</li>
</ul>
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This is one answer to Graham's question about typing bismigalis' answer.
You start with an object Comment
like this:
class Comment():
id = 0
body = ""
children = []
def __init__(self, id, body, children):
self.id = id
self.body = body
self.children = children
Then you will create a list of comments and their children. For the sake of play, I just did it by hand (sorry if it wasn't formatted correctly):
comments = []
comment1 = Comment(1, "First comment", None)
comment2 = Comment(2, "Second comment", [
Comment(3, "Third comment", [
Comment(5, "Fifth comment", None)
]
),
Comment(4, "Fourth comment", None),
]
)
comment6 = Comment(6, "Sixth comment", None)
comments.append(comment1)
comments.append(comment2)
comments.append(comment6)
Then you just make it part of the returned dictionary from your code like:
return {'comments': comments}
The template code in bismagalis' answer will generate the following HTML:
<ul>
<li class="comment" comment_id="1">
<div>ID: 1 First comment</div>
<div>
<ul>
</ul>
</div>
</li>
<li class="comment" comment_id="2">
<div>ID: 2 Second comment</div>
<div>
<ul>
<li class="comment" comment_id="3">
<div>ID: 3 Third comment</div>
<div>
<ul>
<li class="comment" comment_id="5">
<div>ID: 5 Fifth comment</div>
<div>
<ul>
</ul>
</div>
</li>
</ul>
</div>
</li>
<li class="comment" comment_id="4">
<div>ID: 4 Fourth comment</div>
<div>
<ul>
</ul>
</div>
</li>
</ul>
</div>
</li>
<li class="comment" comment_id="6">
<div>ID: 6 Sixth comment</div>
<div>
<ul>
</ul>
</div>
</li>
</ul>
It looks like there are quite a few extraneous tags in there <div>
and <ul>
so I may have missed something ...
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