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Applies only to Mobile Apps and Reactive Web Apps
Service Studio version:


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  • You can use the Counter UI Pattern to display numerical information as a notification. For example, the Badge UI pattern is frequently used to notify users about the number of unread emails, unopened messages, or new tasks they may have.

    How to use the Counter UI Pattern

    The following example demonstrates how you can display the number of registered users on your platform.

    1. In Service Studio, in the Toolbox, search for Counter.

      The Counter widget is displayed.

      If the UI widget does not display, it may be because you used a ready-made app, which deletes unused widgets from the module. To make additional widgets available in your app:

      a. Go to Module > Manage dependencies.

      b. Search for and select the relevant Producer, for example OutSystemsUI. Ensure Show All is selected.

      c. On the Public elements for the selected Producer displayed on the right, ensure Show All is selected.

      d. Search for and select the element you want to add, and click Apply.

      e. In Service Studio, in the Toolbox, search for the widget again.

    2. From the Toolbox, drag the Counter widget into the Main Content area of your application's screen.

      By default, the Counter widget contains a Content placeholder.

    3. To create an aggregate (in this example to retrieve all the users on the platform), right-click the screen name and select Fetch Data from Database.

    4. To add a database entity, click the screen, and from the Select Source pop-up, select the relevant entity and click OK. In this example, we select the User entity.

      The aggregate GetUsers is created.

    5. To reopen your screen, select the Interface tab, and double-click on your screen.

    6. From the Toolbox, drag an Expression widget into the Content placeholder, and in the Expression Editor enter the following expression and click Done.


    You have now created an expression that displays the Count property of the Aggregate you created earlier, which gets and displays the number of users on your platform.

    1. On the Properties tab, you can customize the Counter's look and feel by setting any of the optional properties, for example, the height and orientation.

    After following these steps and publishing the module, you can test the pattern in your app.


    Property Description
    BackgroundColor (Color Identifier): Optional The counter's background color. Red, orange, yellow, lime, green, blue, violet, and pink are just some of predefined colors available for the badge.


    • Blank - No background color is applied to the counter. This is the default.
    • Entities.Color.Red - Displays a red counter.
    IsVertical (Boolean): Optional If True, the content is displayed vertically. If False, the content is displayed horizontally. This is the default.
    Height (Text): Optional The counter's height (in pixels units). By default the counter height is 100 (pixel units).
    ExtendedClass (Text): Optional Adds custom style classes to the Pattern. You define your custom style classes in your application using CSS.


    • Blank - No custom styles are added (default value).
    • "myclass" - Adds the myclass style to the UI styles being applied.
    • "myclass1 myclass2" - Adds the myclass1 and myclass2 styles to the UI styles being applied.
    You can also use the classes available on the OutSystems UI. For more information, see the OutSystems UI Live Style Guide.
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