String operations in Code

[DonalRafferty]

Is it possible to use Javascript/Flutter syntax for string operations in a code block?

For example (from a DropDown element):

    onChange:
          action: executeCode
          body: |
            //@code
            loading.visible = true;
            card.text = this.value.substring(0, 4);

When I try this, the Text element with the id 'card' doesn't update. If I remove the substring method, it does. I have also tried charAt, substr, and slice without any success.

[kmahmood74]

Hi @DonalRafferty yes it is possible. We have unit tests too that cover this here - https://github.com/EnsembleUI/ensemble_ts_interpreter/blob/master/test/new_interpreter_tests.dart

All the supported string functions are in _String class here - https://github.com/EnsembleUI/ensemble_ts_interpreter/blob/master/lib/invokables/invokablecontroller.dart

I'll look at your screen and debug what's going on. Your syntax is correct. Just to confirm - if you just do -

card.text = this.value

This works but when you substring, it doesn't?

Could you please share what is this.value?

[kmahmood74]

@DonalRafferty I believe I am looking at the right screen definition - Product Code Demo. I couldn't find a field with id: card there. Is it on a different screen?

[amin-nas]

@DonalRafferty see string related examples here:
https://studio.ensembleui.com/app/e24402cb-75e2-404c-866c-29e6c3dd7992/screen/bf9e503e-286b-437a-a692-14d0d5814918