Form output values are not updated based on the changes in the input value

[GeethaParthasarathy]

Describe the bug

Create a form say with "Number" field and add a input value to it. The given input value is reflected in the output value field and the Form preview. But when we delete the value one digit by digit the last digit remains in the output field even though there is no value at all in the input value field

Steps to reproduce

1. Create a form with number field
2. In the input values add a value to the number say 67
3. Now we could see the value 67 in both the preview and the output value field
4. Delete from the last digit to the first
5. We could see that the first digit here "6" is not deleted from the preview or the output field even though no value exists in the input field

abb59c94a521fadf7ae18d35274401ef.mp4

Expected behavior

Update the preview and the output field based on the values provided in the input field

Environment

• OS: [Windows 10]
• Camunda Modeler Version: [5.0.0]
• Execution Platform: [e.g. Camunda Platform, Camunda Cloud]

Additional context

No response

[marstamm]

I think this is expected behavior. The input should be JSON format. Deleting the last digit makes this syntactically invalid JSON that is not accepted as input and the last valid input is used.

[smbea]

That makes sense. But I have to say it seems like a bug from the user's POV

[pinussilvestrus]

Nice catch, indeed. A good example of why proper JSON error handling might be needed (cf. this comment).

[christian-konrad]

@pinussilvestrus should we move/copy it to the form-js repo? I agree on the error handling

[christian-konrad]

@pinussilvestrus I created this follow-up issue: camunda/form-playground#20