UIData needs review on a couple of fronts
[JAVASERVERFACES_SPEC_PUBLIC-965] Provide a component for iterating over hierarchical data Created: 07/Apr/11 Updated: 01/Aug/14
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With the integration of Facelets into JSF 2.0 a component for iterating over list data (UIRepeat) that does not render any markup itself was introduced in the spec. This is very useful for creating "table" like composite components that render custom markup.
A component that only iterates a hierarchical data structure would allow creating "tree" like composite components that render custom markup.
The usage could look something like:
" var="node" varStatus="status">
It is possible to implement a similar "workaround" component on top of UIData with a special renderer for UIData + UIColum and a UIOutput for the "tree childs". The iteration over the tree nodes can be recursively done in the renderer of the "tree childs".
I think the suggested component really should be part of the spec as it significantly enhances the possibilities when creating composite components. Creating an own tree component is easy with it. It could also be a base for many other "tree" component implementations.
|Comment by kito75 [ 19/Apr/11 ]|
I would argue that any such component should render as a simple tree (with basic features like expanding/collapsing nodes, images for folders and leaves, etc.) by default, like UIData does. I would also expect a standard TreeModel.
|Comment by Mathias Werlitz [ 19/Apr/11 ]|
Well the idea is not to implement a complex tree component, but allow rendering of hierachical markup like <ul><li> in general, leaving the developer of an application the flexibility to render any content.
Infact my "workaround" component uses a special DataModel impl. (to let UIData think the nodes are sequential rows) and a very simple interface for tree nodes. But this interface only allows to get the childs of a node, nothing more. The component does not know anything about the tree state, it does only iterate over the data. Tree state is part of a custom user definded model (in this case: of the node) and the facelets template.
|Comment by Ed Burns [ 01/Aug/14 ]|
Set priority to baseline ahead of JSF 2.3 triage. Priorities will be assigned accurately after this exercise.
|Comment by Manfred Riem [ 01/Aug/14 ]|
Setting priority to Minor