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v 1.9.51

Complex questions in expressions


                        
        
            Survey.StylesManager.applyTheme("defaultV2");
        



                
                    var json = {
  "showQuestionNumbers": "off",
  "elements": [
    {
      "type": "matrix",
      "name": "matrix",
      "title": "Please select the question you wish to answer",
      "columns": [
        {
          "value": "yes",
          "text": "Yes, I do"
        },
        {
          "value": "no",
          "text": "Please do not ask this question"
        }
      ],
      "rows": [
        {
          "value": "name",
          "text": "Could you answer what is your name?"
        },
        {
          "value": "city",
          "text": "Could you tell us the city you have born?"
        }
      ]
    },
    {
      "type": "text",
      "name": "name",
      "title": "What is your name?",
      "visibleIf": "{matrix.name} = 'yes'"
    },
    {
      "type": "text",
      "name": "city",
      "title": "What is the city you have born?",
      "visibleIf": "{matrix.city} = 'yes'"
    }
  ]
};

                    window.survey = new SurveyKnockout.Survey(json);
                
        
            survey.onComplete.add(function(sender) {
            document.querySelector('#surveyResult').textContent =
            "Result JSON:\n" + JSON.stringify(sender.data, null, 3);
            });
        
            
                survey.render("surveyElement");
            

                    
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Complex questions in expressions, Knockoutjs Survey Library Example</title>
    
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</head>
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<script type="text/javascript" src="./index.js"></script>

</body>
</html>

You may use the typical question value, for example "text", in an expression as:

visibileIf: "{textQuestion} = 'Yes'"
For questions like Multiple Text, Matrix, Matrix Dropdown, Matrix Dynamic and Panel Dynamic you can't use the same approach.

Multiple Text, Matrix questions values are objects:
"name": { "firstName": "John", "lastName": "Snow"}
As result you may use it in expression as:
visibleIf: "{name.firstName} = 'John' and {name.lastName = 'Snow'}"


Matrix dropdown question is an object of objects:
"rateTeaches": { "math": { "knowSubject": 5, "explainsClearly": 4}, "literature": { "knowSubject": 4, "explainsClearly": 4} }
You may use it in expression as:
visibleIf: "{rateTeaches.math.explainsClearly} > 3}"


Matrix and Panel Dynamic questions are array of objects:
"rateTeaches": [{"subject": "math", "knowSubject": 5, "explainsClearly": 4}, {"subject": "literature",  "knowSubject": 4, "explainsClearly": 4} ]
The expression can be as:
visibleIf: "{rateTeaches[0].explainsClearly} > 3}"