< Projects | Usability | HIGRevision as of 05:54, 27 May 2015 by Htietze (talk | contribs) (→Appearance)(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff) Purpose A drop-down list is a GUI control which allows the user to choose one value from a list. When a drop-down list is inactive, it displays a single value. When activated, it displays (drops down) a list of values, from which the user may select one. When the user selects a new value, the control reverts to its inactive state, displaying the selected value. A drop-down list works similar to a list box but hides the complete list until the user initiate the drop down. The disadvantage of drop-down lists compared to related controls like radio buttons or lists is that the options are not visible without further interaction. The list provides auto-complete feature for the whole string, independently of the "editable" property. Given the items of "bike", "boat", and "car": If one types "b", the list selects "bike". If one (rapidly) types "bo", it selects "boat". If one types "c", it selects "car". One can repeatedly type a letter to cycle through items of the (read-only) drop-down list starting with this letter. Guidelines Is this the right control Use a drop-down list for single selection of one out of many items. If users should be able to add items use a combo box. For only a few options, consider to use a set of radio buttons. For a single selection out of a large number of items (n>20), use a list view. Prefer controls that show the options without further user interaction, except for the following cases: the list of options may change over time, the contents are obvious from the label and the one selected item, for example Month and January the control is part of a related sequence of controls. For example, to set a reminder to ring 5 hours or minutes before or after an event. Behavior Show a maximum of eight items at once (maxVisibleItems=8). When possible apply changes immediately but do not initiate an action (like print, send, delete) when the user selects an item from a drop-down list. Do not add controls to the drop-down (e.g. check boxes for each item). Place options that represent general options (e.g. all, none) at the beginning of the list. Sort list items in a logical order. Make sure sorting fits translation. Make sure the items are easily accessible via keyboard by moving distinctive letters to the beginning of each option. For example, in a list of countries on continents, write "Germany (Europe)" instead of "Europe/Germany". Do not have blank list items; use meta-options, e.g. (None) instead Appearance If activating a choice affects the appearance or the enabled state of other controls, place them next to the drop down. If certain controls in a configuration dialog are only relevant if a certain item is selected (i.e. they are dependent controls), disable them instead of hiding. Label the drop down with a descriptive caption to the left (cf. alignment). Create a buddy relation so access keys are assigned. End each label with a colon. Use sentence style capitalization for items. Implementation Retrieved from "https://techbase.kde.org/index.php?title=Projects/Usability/HIG/DropDown&oldid=84899" Categories: UsabilityBehaviorEditing and ManipulationSelection Content is available under Creative Commons License SA 4.0 unless otherwise noted.