Data field examples?

Former Member over 9 years ago

Is there any more examples of simple data fields? Might try creating some.

Was looking here and tried an example based off this sample but I can't seem to divide an activity.info by a number or by another activity.info object?

http://developer.garmin.com/connect-iq/programmers-guide/dynamic-data-fields/

Was trying to divide calories by elapsed time to play with in the simulator....(eventually looking to get a calories per minute / per second interval type field)

Thanks

travis.vitek over 9 years ago

Most likely the problem is that you need to check for null, and possibly also a divide by zero. Then, you need to simulate data (via the simulator menu) so that you get actual numbers coming through.

If you just write this...

function calculate(info) {
  // average calories per minute
  return (info.calories / (info.timerTime / 60000.0)).format("%.2f");
}

You'll likely find that info.calories and info.timerTime are null until you simulate data. If you are testing on a device info.calories will probably be 0, but info.timerTime will be null. If you add the null checks...

function calculate(info) {
  if (info.calories == null || info.timerTime == null) {
    return "--";
  }

  return (info.calories / (info.timerTime / 60000.0)).format("%.2f");
}

You should be okay. You could run into a divide by zero problem if info.timerTime you are doing integral division and the timerTime is smaller than the divisor.

Former Member over 9 years ago

Most likely the problem is that you need to check for null, and possibly also a divide by zero. Then, you need to simulate data (via the simulator menu) so that you get actual numbers coming through.

If you just write this...

function calculate(info) { // average calories per minute return (info.calories / (info.timerTime / 60000.0)).format("%.2f"); }

You'll likely find that info.calories and info.timerTime are null until you simulate data. If you are testing on a device info.calories will probably be 0, but info.timerTime will be null. If you add the null checks...

function calculate(info) { if (info.calories == null || info.timerTime == null) { return "--"; } return (info.calories / (info.timerTime / 60000.0)).format("%.2f"); }

You should be okay. You could run into a divide by zero problem if info.timerTime you are doing integral division and the timerTime is smaller than the divisor.

Thanks for the response. I think I'm way over my head on how to get that back into the datafield:(. How is function compute different from function calculate?

Sorry I'm not a programmer but trying to learn the basics on how to get some of these simple fields going with existing watch data.

Cheers.

travis.vitek over 9 years ago

Sorry. I was writing code on my break and typed the wrong function name...