Example of using complex questions values in an expression, Knockoutjs Survey Library Example

Complex questions in expressions

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            Survey.StylesManager.applyTheme("default");
        


            
                var json = { showQuestionNumbers:  "off",
  questions: [
    {
      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 Survey.Model(json);
            
        
            survey.onComplete.add(function(sender) {
            document.querySelector('#surveyResult').textContent =
            "Result JSON:\n" + JSON.stringify(sender.data, null, 3);
            });
        
            
                survey.render("surveyElement");

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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}"

Complex questions in expressions

Example of using complex questions values in an expression

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