問65
頻出度★☆☆
PC の操作画面で使用されているプルダウンメニューに関する記述として, 適切なものはどれか。
平成25年度 春期 ITパスポート試験 問65
テクノロジ系情報デザイン › インタフェース設計
This question's explanation and your answers so far.
解説
問 65
Incorrectア
This is a description of a dialog box. A dialog box is a small window opened temporarily on top of the screen being worked on, either to display an error message or warning message that calls the user's attention or asks for confirmation, or to have the user enter a small amount of data such as a file name or a password. A pull-down menu is a component that lets the user choose from items prepared in advance; it has no function for displaying messages or for letting the user type arbitrary characters.
Incorrectイ
Selecting all the items you need from multiple choices is a description of a check box (or of a list box that allows multiple selection). With check boxes, an independent square box is provided for each item and they are lined up together, so you can mark as many of the applicable ones as you like. A pull-down menu, by contrast, is an exclusive component that lets you choose only one item from the list, so several items cannot be selected at the same time. Choosing only one is the same as with a radio button, but a radio button always displays all the items on the screen, whereas a pull-down menu normally keeps the list folded away; that is the difference.
Incorrectウ
Predicting and displaying the next input content from the past input history during keyboard input is the function called input completion (autocomplete) or predictive conversion, used in search boxes, Japanese input systems, and the like. It is a mechanism that dynamically produces candidates using the characters the user has typed as a clue, and it is a different thing from a pull-down menu, which opens a fixed list of items determined at design time.
- エ
正解 The correct answer is エ. A pull-down menu (also called a drop-down menu) is a GUI component in which normally only the title (heading) part is displayed; when you click it, the list of choices unfolds downward like a curtain being drawn down, and when you pick one item from the displayed list, the chosen item is shown in the title part and the list closes again. エ states exactly this behavior, so it is appropriate. This component has two characteristics. First, because the list is opened only when a selection is being made, it occupies only a small area of the screen even when there are many items (space saving). Second, only one item in the list can be chosen, so the selection is exclusive. It is used in situations such as choosing a prefecture or specifying a date (year, month, and day), where the choices are fixed in advance, are numerous, and the user is to pick only one of them. Because input can be limited to selecting from a list, it also has the advantage of preventing typing mistakes by the user.
ここがポイント
- Definition of a pull-down menu (drop-down menu): a GUI component in which clicking the title part unfolds the list of choices downward and you choose one item from it. Because the list is normally closed, it does not take up the screen (space saving); only one item can be selected (exclusive); and it suits situations where the user is to pick one item out of many.
- Be able to distinguish how the main GUI components are used: choosing only one = radio button (all items always displayed) / pull-down menu (open the list and choose); being able to choose several = check box; typing characters freely = text box; a small window opened temporarily to display a message or to take a small amount of input = dialog box; predicting and presenting candidates from the input history = input completion (autocomplete).
用語