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

Complex questions in expressions

Edit in Plunker

Open in new window

Show in Survey Creator

Export Pdf

Result
JavaScript
HTML
Documentation
QR Code


                        
        
            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(result) {
            document.querySelector('#surveyResult').textContent =
            "Result JSON:\n" + JSON.stringify(result.data, null, 3);
            });
        
            
                survey.render("surveyElement");

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Example of using complex questions values in an expression, Knockoutjs Survey Library Example</title>

<meta name="viewport" content="width=device-width" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.0/knockout-min.js"></script>
<script src="https://surveyjs.azureedge.net/1.7.10/survey.ko.js"></script>
<link href="https://surveyjs.azureedge.net/1.7.10/survey.css" type="text/css" rel="stylesheet" />
    <link rel="stylesheet" href="./index.css">

</head>
<body>
    
            <div id="surveyElement" style="display:inline-block;width:100%;">
            </div>
    <div id="surveyResult"></div>

<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}"

Complex questions in expressions

Example of using complex questions values in an expression

Why We Use Cookies