Listel (listing/grouping element)

Listel (listing/grouping element)

Kind
database model class
expert class
This is an advanced feature or concept for expert users only ! Most users can simply work via the worksheets and model element views.

The term Listel stands in GreenDesk for "listing element" (or "grouping element"). It is a database entity that manages a group of model elements.

Typically a Listel is used for grouping a list of related Blocks in the model, in which case it is usually just referred to as a block group. Authorised users can add and remove child block elements directly to and from block groups (although usually this is done via worksheets instead).

A block group will only accept and offer compatible child blocks for creation; for example, a block group for handling a list of different kinds of blinds might offer to add venetian blinds and roller blinds, as well as a non-specific, generic blinds.

Most block group elements use 'indexed' mode, where every block has unique data.

Some block group elements use 'template' mode; they store a single block that represents all blocks in the group. This could be useful, for example, for efficiently representing a large list of identical windows on a building floor.

A Listel can also be used in combination with parametrics.

Q: Do I have to know how block groups work to use GreenDesk ?
No. Nearly everything you need to do can be done without knowing how block groups are used behind the scenes. The various views and rich interactive worksheets in GreenDesk take care of that for you so you simply have to add Blocks to block groups, and then edit the Values carried by the blocks, which is typically done using convenient row-editing in worksheet tables.
Q: How do I remove/delete a block from a block group ?

Usually you don't have to remove it, you should usually instead just "disable" it; it will then no longer be included in Expert System calculations, and can (depending on the current display options) also usually be hidden from view in worksheets if you choose.

For more information please see the section on enabling/disabling blocks under Blocks.

Demonstrated by
Related classes
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