SAP Fiori Elements with Annotation Expression

To note down annotation expression examples I have used and proved workable. Unfortunately, I didn't find any official documents so far. Will update here if I get any.

Apply a Function

A function can be used to calculate wanted value for a specified UI place. The example below is use 'odata.concat' to concatenate three fields with '-' as the separator, and display it as the title of the object page. Without this approach, backend service needs to add a dedicated field and do the concatenation at the backend. But I found that this doesn't work in DataField. I think the reason may be there is annotation ConnectedField for this purpose. This tested successfully with FE V2.

IF-ELSE

For some simple dynamic control cases, it is much easier to determine the result on the client side instead of the backend side. Below is an example of a general case that to display or hide a form group according to a field value. It evaluates a value from the field specified with tag 'Path', compares it to a string value specified with tag 'String'. The comparison operation can also be specified via different tags.

If the result is true, then return the first tag after comparison tag(''</Eq>"). Otherwise, return the second tag. Again, the advantage is saving a technical control field which previously need to be provided by backend service. This is tested successfully with FE V4.

When field 'Type' is value of 'application', then group 'Visualization' will be displayed.

Otherwise, it will be hidden.

Another example from CAP sample app:

Example of IF-OR

Example for criticality of a data point(tested OK with V2)