Application Messages Requiring User Action

Some application messages require the user's attention. There are two types of these message alerts: dialog boxes and pop-up notifications.

The following table provides additional information with image examples.

Type	Description	Example
Dialog box	When an application needs the user to make a decision so it can continue, display a message in a dialog box when the application is in the foreground or minimized to a card. The dialog panel rises from the bottom of the current scene, and is attached to it. It can have multiple buttons, the Data Picker menu set, and even a text entry field.
Pop-up notification	If an application needs to get the user's attention while it is in the background, use a pop-up notification message. It rises from the bottom of the screen and displays the available user options. You are responsible for designing and implementing the UI that appears in pop-up notifications. When you design them, make them as small as possible and limit the height to less than half the screen's height. Examples: While using one application (like Web), the Calendar Alarm goes off. The Calendar app displays a reminder, which the user must respond to before it can close. The HP webOS platform displays pop-up notification, too. You can see one when plugging a USB cable into your webOS device and computer. The pop-up notification asks what you want to do: mount the webOS device as a USB drive or simply charge it.