This article describes data validation for fields in SAP Fiori apps. This includes information about the validation points and the choreography associated with messaging.

For more information on the messaging concept for SAP Fiori apps, see the article on message handling.

Behavior and Interaction

The message popover is only used to display field-related messages.

Validation Choreography

When to Use

Use the “focus out” validation when a draft has few fields to validate.

Don’t use the focus out validation when:

• A draft has many fields to validate.
• Users prioritize quick data entry and don’t want the interruptions caused by repeated validation and related loading time.
• Users regularly enter data in a draft for some, but not all fields.
• Users accelerate data entry with keyboard navigation.

On “Enter”

L / XL Screens

• The entire form is validated, or the whole object including all the forms it contains.
• If the user selects a value by pressing Enter, the value is selected without triggering validation (for example, when adopting a suggestion or entering a value in a combo box). The user must then press Enter a second time to trigger the full form validation process.
• Any errors or warnings are displayed in a message popover.

S / M Screens

• On phones and tablet devices, there is no Enter shortcut. Instead, a Validate button is available in the footer. The Validate button is combined with Save in a split menu button.

When to Use

Use the “on enter” validation when:

• Users are familiar with pressing the Enter key for validation.
• A draft has many fields to validate.
• You want to let users control when the validation happens.

• When users need a validation option that’s easily recognizable.

On “Create” or “Save”

• The entire form is validated.
• A message popover displays any errors or warnings.

When to Use

Validation

• Highlight the specific field and include a useful message.
• Display a button on the left side of the footer toolbar.
• The button displays the sap.m.MessagePopover. For more information, see message popover.
• If the issues have been resolved, and the user is able to proceed, remove the corresponding messages.

Connected Fields

Some fields are connected because the coherence of their values depend on each other. At the time of validation, one or several of those connected fields are highlighted according to the case. In every case, the value state message is the same for every field.

Some examples of connected fields are: value/unit of measure, price/currency, or zip-code/city.

Error Prevention

Help the user to avoid errors by using input types (sap.m.InputTypes) and mask input (sap.m.MaskInput). The input fields automatically get a specific format, which helps prevent the user from making invalid entries.

Always start with the least complex control (for example, use select instead of value help if the user needs to select only one item from a short list). Only use more intricate controls if the use case really requires it.

Guidelines

Depending on the floorplan, certain validation guidelines need to be applied.

Global Edit Flow

This floorplan is significant in that the actions are only displayed in the footer toolbar on the main page of the object. The subpages do not provide action buttons. Therefore, the message popover includes all messages for the whole object (the main object page and all subpages).

The validation can be triggered by the following:

• Focus Out: Current field, or current field and dependent fields.
• On Enter: The form with the latest focus and possible dependent fields in other sections on a page
• Action Button: Complete object validation including subpages.

For more information, see Complex Objects – Global Flow.

Partial Editing

When the user clicks Save, the whole form remains in a busy state until the action has been completed:

• If there are no messages: switch to display mode.
• If there are messages that relate to a field: highlight the respective field with its value state and do not use the message popover. 
• If there are messages that do not relate to a field, show a dialog with the message(s).

For more information, see Partial Edit.

Message Popover Control

Do not show the message button and message popover:

• In a popover
• In a partial editing area. If you offer partial editing, never show a message popover for the part of the screen being edited. The message popover always belongs to the footer toolbar for the whole page.

Instead, just highlight the fields that contain errors to make it easier for the user to understand the issue(s).

Resources

Want to dive deeper? Follow the links below to find out more about related controls, the SAPUI5 implementation, and the visual design.