Knockout / jQuery: An expression validator doesn't update the validation message on value change

[FHourmy]

Are you requesting a feature, reporting a bug or asking a question?

Bug

Specify your

• surveyjs platform (angular or react or jquery or knockout or vue): jquery
• surveyjs version: 1.9.104

What is the current behavior?

Validator text containing an expression doesn't update properly on value change (version 1.9.104).
It used to work (tested on 1.8.71)

What is the expected behavior?

Validator text containing an expression should update when the value changes

How would you reproduce the current behavior (if this is a bug)?

reproduced on sandbox : https://codesandbox.io/s/winter-voice-vjcypc
enter a value, see the error text not updating

Provide the test code and the tested page URL (if applicable)

Tested page URL: https://codesandbox.io/s/winter-voice-vjcypc

[JaneSjs]

Hi @FHourmy,
Thank you for sharing the demo. I tested it on my end and confirms that expressions and validation work as expected. For instance, enter 30 within the first input field. The 'leftover' expression receives the 70 value and the error message appears as expected:

Now, enter 120 for the first field. The leftover expression is now set to -20 which is less than 0. The validation expression evaluates to true and the error message disappears.

Please let me know if you are expecting different behavior.

[FHourmy]

Hi @JaneSjs

For the Bug to happen here is the step by step :

• initial state : correct value, no error
  
• you enter a wrong value => the error is triggered with the correct text
  
• you enter another wrong value => the text error is not updated

[andrewtelnov]

@FHourmy The issue has been fixed by this PR.

Thank you,
Andrew