Oscar Bou created ISIS-764:
------------------------------
Summary: Implement @BulkParam annotation for executing the same
action over a Collection of entities
Key: ISIS-764
URL: https://issues.apache.org/jira/browse/ISIS-764
Project: Isis
Issue Type: Improvement
Components: Viewer: Wicket, Core
Reporter: Oscar Bou
Assignee: Dan Haywood
Fix For: core-1.5.0
As an Isis user
I want to pass as an action parameter a collection of entities
In order to avoid repetitive work to the end-user
The idea is to being able to annotate one of the action params with a new
annotation, named @BulkParam, such as in:
public class TodoItem {
...
private TodoItem parentTodoItem;
....
public void addRelatedTodo(@Named("To-Do Item") @BulkParam TodoItem todoItem,
@Named("Comments") String comments) {
....
}
...
}
Where the viewer founds it, instead of asking for one TodoItem, it will allow
the user to select multiple items.
Once done, it will execute the action multiple times, passing each time one of
the TodoItem selected.
If there are other params, the viewer will pass on each action invokation the
same value for all them.
Only one param can be annotated with @BulkParam, for avoiding combinatorial
explosion (10 items selected of one param, 10 items on the other param would
require to be execute 100 times, one for each combination).
The User Interface could be adapted to the choices or autocomplete parameter
facets, for easing the work of the user.
If "choices", there can be alternative displays (see
https://plugins.jquery.com/tag/multiselect/):
1. the viewer can present the user a grid or checkbox (like the one in
http://liveline.github.io/jquery-checkallbox/) with all choices, and the user
can check any of them. Alternative:
http://www.ryancramer.com/journal/entries/select_multiple/
2. multi-select drop-down, like this ones: http://ivaynberg.github.io/select2/,
http://harvesthq.github.io/chosen/,
https://github.com/ehynds/jquery-ui-multiselect-widget,
http://www.droplist.vinmein.com/. They require minimal changes on the current
actions dialog, but does not allow to always view all choices selected (I could
live with it).
If "autocomplete":
1. It could be based on a two panels disposition, left and right, where the
user incrementally searches on an edit box placed over the left panel, similar
to current autocomplete implementation, but placing on the left panel :
http://quasipartikel.at/multiselect_next/
2. Similar approach to the "choices" one, also with this same widget that
admits remote dataset loading and min number of chars entered:
http://ivaynberg.github.io/select2/
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