Taxonomy Enhanced Text Widget

Converts Text Fields into Select list options where the values are taken from Taxonomy Vocabulary. It differs from Taxonomy Reference such that, the values are not stored as term references (or Tid) but are stored as term names as simple text.

Optionally you can choose to take custom input from User, where in this case it behaves very much close to Select (or Other).

Possible use case.

For example, you offer a product where customer can specify a custom quantity. But let say 1Kg, 5Kg and 10Kg are the popular demands. So you can create a Vocabulary called Package, and create 3 terms 1Kg, 5Kg and 10Kg. Configure the form element to use 'Taxonomy Enhanced Text Widget' and then enable the "other" option. This will present a select list to choose from along with "other" option in the end. If the customer choose "other" he will be provided with normal text field to input their custom demand.