Additional data passed through form

[kbrilla]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[x] Feature request
[ ] Documentation issue or request
[ ] Support request
[ ] Other... Please describe:

Expected behavior

I would like to propose ability to pass some custom observable data to form to be able to pass it through form control. It is really useful if that data is dependent on something in form model and we want to for example create that form in dedicated service.

  <kendo-multiselect
                #list
                [data]="control.data$ | async"
                [filterable]="true"
                textField="text"
                valueField="value"
                placeholder="T-shirt size"
               [formControl]=[control]
   >
    </kendo-multiselect>

and in service

 createControl(){
   const control = new FormControl<number>(undefined);
   control.passData(someObservableData$);
}

here it is a bit simplified and the use cases is not very visible but imagine this data being dependent on other form values from for example parent form. And some validations and disabled states also also depend on that data in other field etc.

I'm currently working on such form and such feature would be really useful and allow me to do everything much more neatly.

It become really usefull if data is used for a field in model that is in form array and is dependent on field from parent form group.

Just not sure if it should be observable or just "any" and let user decide what is needed.

[NetanelBasal]

I am not sure what is the use case and the functionality. Can you provide a complete example, please?

[kbrilla]

@NetanelBasal It will take some time but I already have use cases in my project so I will try to write something based on that.

[itayod]

@criskrzysiu any progress with the usecase?