Ī modal dialog interrupts the main workflow. Dangerous actions should be undoable wherever possible a modal alert dialog that appears unexpectedly or which is dismissed automatically (because the user has developed a habit) will not protect from the dangerous action. Usability practitioners generally regard modal dialogs as bad design-solutions, since they are prone to produce mode errors. Modal dialog boxes temporarily halt the program: the user cannot continue without closing the dialog the program may require some additional information before it can continue, or may simply wish to confirm that the user wants to proceed with a potentially dangerous course of action ( confirmation dialog box).
One current example is the shutdown screen of current Windows versions.
System modal dialogs were more commonly used in the past on single tasking systems where only one application could be running at any time. System modal dialog boxes prevent interaction with any other window onscreen and prevent users from switching to another application or performing any other action until the issue presented in the dialog box is addressed. (This isn't meant to be an example of the best possible interface for this often the same functionality may be accomplished by toolbar buttons on the application's main window.) The user can continue adding text to the main window whatever color it is, but can change it at any time using the dialog. An example might be a dialog of settings for the current document, e.g.
In general, good software design calls for dialogs to be of this type where possible, since they do not force the user into a particular mode of operation. A type of modeless dialog box is a toolbar which is either separate from the main application, or may be detached from the main application, and items in the toolbar can be used to select certain features or functions of the application. Non-modal or modeless dialog boxes are used when the requested information is not essential to continue, and so the window can be left open while work continues elsewhere. Īn example of a dialog box is the about box found in many software programs, which usually displays the name of the program, its version number, and may also include copyright information. ( E.g., " Gedit has encountered an error and must close.") Although this is a frequent interaction pattern for modal dialogs, it is also criticized by usability experts as being ineffective for its intended use, which is to protect against errors caused by destructive actions, and for which better alternatives exist. Alerts are also used to display a "termination notice"-sometimes requesting confirmation that the notice has been read-in the event of either an intentional closing or unintentional closing (" crash") of an application or the operating system. The simplest type of dialog box is the alert, which displays a message and may require an acknowledgment that the message has been read, usually by clicking "OK", or a decision as to whether or not an action should proceed, by clicking "OK" or "Cancel". The type of dialog box displayed is dependent upon the desired user interaction. English) or simply dialog) is a graphical control element in the form of a small window that communicates information to the user and prompts them for a response.ĭialog boxes are classified as " modal" or "modeless", depending on whether they block interaction with the software that initiated the dialog.
The dialog box (also called dialogue box (non-U.S.