Currency selector behaviour

[LeeCampbell]

Must

• Allow entry of a single currency
• Allow entry of a currency pair
• Allow autocomplete/suggest of currencies

  Should

• Validation Support - Red border and tooltip with error message
  • The data model may decide that null is valid or not.
  • It may also decide other rules such as you cant have duplicate values for a filter. (the control should be agnostic of this)
• Should allow weighted ordering of the suggestion list
  • i.e. when Typing 'E' then 'EUR', should pop to the top not 'ECS', 'EEK', 'EGP','ESB', 'EUR'
  • When typing, favor suggesting shorter over longer ie 'EUR', 'ECS', 'EEK', 'EGP','ESB', then 'EURUSD', 'ECSCAD', 'ECSUSD'
  • so typing 'E' should get a list like EUR ECS EEK EGP ESB EURUSD EURCAD EURAUD....
• Should allow the typing of inverted currency pairs. e.g EURUSD or USDEUR

  Could

• Only allow valid values?

  Wont