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What does the component do?

  • Causes an action by the user for specific decisions.

When should the component be used?

  • When an action has to be confirmed by the user.
  • To display critical information that has to be confirmed by the user.
  • To request actions that has to be confirmed by the user.
  • To select decision options by the user.



  • Dialogs are displayed as modal windows in front of the application.
  • Dialogs disable all application functions and remain displayed until they have been confirmed, cancelled or a necessary action has been performed.
  • Dialogs are purposefully interruptive, so they should be used sparingly.
  • The dialog can be closed and thus the action cancelled in several ways:
    • via the 'X' on the right in the header of the dialog.
    • via a click on the 'glass' in the background
    • via a 'Cancel'-button (if available)
    • 'ESC' key on the keyboard


  • The dialog has its own header, content area and button bar.
  • It should be prevented from scrolling. If it cannot be prevented, the header and button bar are sticky.
  • The primary action is placed to the left of the secondary action.
  • A 'glass' is displayed behind the dialog, thus blocking editing outside the dialog.


  • The header may contain context-describing information (e.g. the train number).
  • The content of the dialog can be used completely flexibly, e.g.
    • a detailed description of the situation and a clear question to be answered by the user.
    • a form to create or edit a complex data object.


  • Confirmation actions are disabled until a selection is made or the form is valid (all mandatory fields filled and no incorrect entries).
  • Cancel actions are never disabled.
States and variants


Simple (Warnings / Confirmations)

This variant has following states:

  • Default

Image of a dialog, simple

Complex (Forms)

This variant has following states:

  • Valid
  • Not Valid

Image of a dialog, complex

  • The complex variant is used to create or edit complex data objects if they cannot be edited directly in the content of the application.
  • If the user wants to dismiss the dialog and ...
    • no changes have been made, the dialog closes and no discard confirmation is required.
    • the user has made changes, the user is prompted to confirm the discard action.



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