Javascript for Label

[kaijk]

I want to use a template to accommodate when batteries report either V or %. Nominal voltage is 3V, two AA batteries in series.
Here is my attempt.

  label: >
    [[[
      if ( ${entity.attributes.unit_of_measurement} == '%' )
        return ${entity.state}% Remaining
      else
        return ${entity.state} / 3 + '% Remaining'
    ]]]

but the syntax check fails. I've traversed the git examples and don't see a similar example.

[dcapslock]

if ( ${entity.attributes.unit_of_measurement} == '%' )

Error here. You can't construct a string for equality. Suggest

if ( states[entity.entity_id].attributes?.unit_of_measurement === '%' )

return ${entity.state}% Remaining

Also error here as you are returning a string. Suggest

return ${entity.state} + '% Remaining'

[RomRider]

It's just syntax error:

  label: >
    [[[
      if (entity.attributes.unit_of_measurement == '%' )
        return `${entity.state}% Remaining`;
      else
        return `${entity.state / 3} + % Remaining`;
    ]]]

[kaijk]

This does the trick. Thanks for the help!

  label: >
    [[[
      if (entity.attributes.unit_of_measurement == '%' )
        return `${entity.state}% Remaining`
      else
        /% Compute percent remaining from Two AA batteries in series (3 volts) %/
        var volts   = Number(entity.state)
        var percent = 100 * volts / 3
        return `${percent.toFixed(1) + '% Remaining'}`
    ]]]