function with argument in JS file called in my QML fail

filipdns

Hello guys,

I'm trying to add argument to my JS fonction to use it in my QML form but it's not working.

here working code:

function sum()
{
  var res = 0;
  var res1 = 0;
  var result = 0;
  for(var i = 0; i < listModel.count; i++){
  res += parseFloat(listModel.get(i).trip_time);
  }
  for(var i1 = 0; i1 < listView.currentRow; i1++){
  res1 += parseFloat(listModel.get(i1).trip_time);
  }
  result = res-res1;
  return result;
}

but when I try to replace "trip_time" by argument like that:

function sum(column)
{
  var res = 0;
  var res1 = 0;
  var result = 0;
  for(var i = 0; i < listModel.count; i++){
  res += parseFloat(listModel.get(i).column);
  }
  for(var i1 = 0; i1 < listView.currentRow; i1++){
  res1 += parseFloat(listModel.get(i1).column);
  }
  result = res-res1;
  return result;
}

and call the function in my qml with:

JS.sum(trip_time)

I receive error :
ReferenceError: trip_time is not defined

I used many time this method to add argument like below:

function hourtodec(hour)
{
    var res = hour.split(":")
    var hours = parseInt(res[0]);
    var minutes = parseInt(res[1]);

    var dec = hours+ minutes/60;
    return dec;
}``

and I never got this problem before...

Could you help me please?

Thank you very much

SGaist

Hi,

If I understand correctly trip_time comes from your model. Where do you get it from when calling the new version ?

JonB

@filipdns
If I understand correctly:

In your "working" example, hour is just a variable passed into function hourtodec, and is used as such.

In your "non-working" code, you start with listModel.get(i).trip_time. trip_time is an attribute name. You cannot "factor this out" by trying to pass a parameter into sum() --- you can't simply define function as sum(column) and then use column in listModel.get(i1).column to somehow replace the need to reference the trip_time attribute.

Unless QML --- which I know nothing about --- magically changes the syntax/behaviour of JavaScript....

filipdns

Hello I solved the problem with :

function sum(column)
{
  var res = 0;
  var res1 = 0;
  var result = 0;
for(var i = 0; i < listModel.count; i++){
  res += parseFloat(listModel.get(i)[column]);
  }
  for(var i1 = 0; i1 < listView.currentRow; i1++){
  res1 += parseFloat(listModel.get(i1)[column]);
  }
result = res-res1;
  return result;
}

and call the function in my qml form with:

JS.sum("trip-time")

thank you for your help!!

filipdns

This post is deleted!

JonB

@filipdns
Yes indeed, well done! Here instead of trying to use column as a direct JS property reference now you are using [column] as a property accessor and passing the string "trip_time" as the name of the property. In JS object.property refers to the same as object["property"].