Out of the box, this module implements the hierarchical_select hooks for the taxonomy. It also converts hierarchical vocabularies that are used as exposed filters in any View to a hierarchical select.
Any module that uses a select form element, of which the options are ordered hierarchically, can take advantage of this new form element. Especially when there's a deep hierarchy, or when there are a lot of options in each sublevel, this form element greatly simplifies the user's search for the right option.
Hierarchical Select has the ability to save the entire lineage of a selection or only the "deepest" selection. You can configure it to force the user to make a selection as deep as possible in the tree, or allow the user to select an item anywhere in the tree. Levels can be labeled, you can configure limit the number of items that can be selected, configure a title for the dropbox, choose a site-wide animation delay, and so on.
The hierarchical selection can be configured and turned on and off for each vocabulary.
Unpack in your modules folder (usually /sites/all/modules/) and enable under Administer > Site Building > Modules.
· Drupal 5.x
· jQuery Interface
· jQuery Update
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