Checkboxes: Selected choices are not reflected in another field that uses the defaultValueExpression property

[gitikakhanna]

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

Reporting a bug

What is the current behavior?

The selected choices (in checkboxes question) are not reflected in another field when trying to access the answer using Default Value Expression

What is the expected behavior?

Selected choices should be accessible and rendered in another field using Default Value Expression.

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

Step 1: Create a Checkbox question with multiple choices (question1)

Step 2: Create a Single-Input Field (question2) and the default value expression should be set as {question1}

Step 3: In the Preview tab, select multiple choices in Question 1. The value reflected in question 2 will be only the first choice that was selected in question 1. It does not reflect all the selected options separated by a comma.

Step 4: Unselect all choices in question1 and the question2 will still be reflecting the very first choice selected in question1.

In the below example, I selected multiple options in Question 1 (Favourite Sports) and the answer reflected in the text field didn't contain all the selected options. When I unselected all options, even then the value in second field did not change.

Checkbox.Bug.SurveyJS.mov

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

Tested page URL:
The bug is reproducible in the following codesandbox

Test code
https://codesandbox.io/s/checkbox-question-bug-28xq84?file=/src/json.js

Specify your

• browser: Chrome
• browser version: 112.0.5615.49
• surveyjs platform (angular or react or jquery or knockout or vue): jquery
• surveyjs version: 1.9.81

[JaneSjs]

Hello @gitikakhanna,
I appreciate your detailed explanation, and a demo. I reproduced the issue using the latest SurveyJS Form Library version. We'll research this issue and update you as soon as we get any news to share.

Thanks

{
 "logoPosition": "right",
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "checkbox",
     "name": "question1",
     "choices": [
      "Item 1",
      "Item 2",
      "Item 3"
     ]
    },
    {
     "type": "text",
     "name": "question2",
     "defaultValueExpression": "{question1}"
    }
   ]
  }
 ]
}

[gitikakhanna]

Hello @gitikakhanna, I appreciate your detailed explanation, and a demo. I reproduced the issue using the latest SurveyJS Form Library version. We'll research this issue and update you as soon as we get any news to share.

Thanks

{
 "logoPosition": "right",
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "checkbox",
     "name": "question1",
     "choices": [
      "Item 1",
      "Item 2",
      "Item 3"
     ]
    },
    {
     "type": "text",
     "name": "question2",
     "defaultValueExpression": "{question1}"
    }
   ]
  }
 ]
}

Thank you @JaneSjs