FormArray fields value updating

[mga47]

Hi
I have some problems when try to use FormArray functionality.

In each row I have 2 select boxes, and the options of second select box depends on first select box value.
I found the solution of this problem. After onChange() action in first select box I remove the appropriate row from arrayModel, change the createGroup method implementation and insert the row in old place. Now the problems.

1. I don't know which row select box value changed. I can't pass the row number to my method.
2. Because of problem 1 I decide remove all rows where select box Id and Value equal to $event.model ID and Value. after that I try to return old values to my fields like this, and nothing happened.
   (this.arrayModel.groups[rowNum].group[itemVal] as DynamicFormValueControlModel<string>).valueUpdates.next(array[+itemVal]);

When I try after this line of code recreate FormGroup and ArrayControl, like this:
this.formGroupGrid = this.formService.createFormGroup(this.formModelGrid); this.arrayControl = <FormArray> this.formGroupGrid.get(RlappConstants.gridName);
I get an error

I can give you plunker example upon your request.

P.S
Thanks for great library )

[udos86]

@garnikmkrtchyan Thanks for your message!

After reading through your issue my conclusion is that adding additional information to the change event for FormArray controls would solve your problem, right?

[mga47]

It will solve my problem partially. Even if I know which row I must replace, the valueUpdateing functionality doesn't work in this case.

[udos86]

I think it would solve your problem as long as you avoid recreating the FormGroup again because I assume this leads to a mess of lost references.

You've already figured out correctly how to update the value of a FormArray control:
this.arrayModel.get(1).get(0).valueUpdates.next("new value");

So if we extend the change event by adding a context information from which you can read the row index you could directly call valueUpdates.

[mga47]

Thanks for your answer @udos86 .
I can give you some additional info about this issue, that may help you later.

After creating a FormArray (that contain only one row), I call Initialize method to fill it from my dataset. All this work fine, row after row it create and fill my grid.

But if I try later update some rows values by same mechanism, I get errors. From that errors I understand, that inner structure of FormArray was broken, and some references contain wrong (maybe old) values.

That's all about this. Now my problem solved by another way, and I hope that you can provide a more simple mechanism to valueUpdating.

[udos86]

@garnikmkrtchyan Ok!

Nevertheless 1.4.12 will deliver some enhancement for DynamicFormControlEvent.