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"].