An exclamation mark operator (!) produces an error in async expressions

[mgoetz-nerdery]

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

Reporting a bug

What is the current behavior?

When using the ! operator on an async expression, the page errors out with "this.returnResult is not a function."

What is the expected behavior?

The page should not error out, and should work as expected.

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

1. Create a custom function that returns a value (using this.returnResult)
2. Register it to FunctionFactory as an async function (third parameter set to true)
3. Use this function in an expression such as visibleIf, and use the ! operator to negate it.
4. Observe the failure.

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

Tested page URL: https://codesandbox.io/s/brave-heyrovsky-3rzmnc?file=/src/SurveyComponent.jsx

Specify your

• browser: Google Chrome
• browser version: 117
• surveyjs platform (angular or react or jquery or knockout or vue): React
• surveyjs version: 1.9.114

[JaneSjs]

Hello @mgoetz-nerdery,

Thank you for sharing a demo. From what I gather, you placed an exclamation mark before your custom function to invert the custom function's result.

We will investigate this issue and provide you with an update shortly.

[mgoetz-nerdery]

Yep, that's correct! It works fine if I don't use the exclamation point, but when I do use the exclamation point to negate the result of the expression, that's when I see the error.

[mgoetz-nerdery]

Confirmed that this is resolved in my test case when I update to 1.9.115. Thanks for the fast turnaround!