Goal

Dynamically show a star rating based on a numeric score.

This example uses a familiar set of star icons to display an aggregated value taken from many previous rating. To see how to capture and display an individual rating, see the Set a Numeric Rating Using Rich Text Icons recipe.

This scenario demonstrates:

• How to use a!forEach() within rich text.
• How to dynamically set a parameter within an interface component.

Expression

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a!localVariables(
  local!score: 5.88,
  local!limit: 10,
  a!richTextDisplayField(
    value: {
      a!forEach(
        items: enumerate(local!limit) + 1,
        expression: a!richTextIcon(
          color: "ACCENT",
          icon: if(
            fv!index <= local!score,
            "star",
            if(
              fv!index - 1 < local!score,
              "star-half-o",
              "star-o"
            )
          )
        )
      )
    }
  )
)

Test it out

1. Change the value of local!limit and click TEST to reload the interface.
   • Observe that the number of total stars will change.
2. Change the value of local!score and click TEST to reload the interface.
   • Observe that the number filled in stars will change.

Notable implementation details

• The calculation does no rounding on the score. Any score between a whole number will receive a partial star. This can be easily adjusted in the second if() statement, providing a different value than 1 when running the index comparison against local!score.