Use custom function in expressions


                        
        
            Survey.StylesManager.applyTheme("defaultV2");
        

function rowsWithValue(params) {
   if (!params && params.length < 2) return false;
   var matrixValue = params[0];
   var value = params[1];
   var rowCount = 0;
   for(var key in matrixValue) {
     if(matrixValue[key] == value) rowCount++;
   }
   return rowCount;
}
Survey.FunctionFactory.Instance.register("rowsWithValue", rowsWithValue);

                
                    var json = {
  "elements": [
    {
      "type": "matrix",
      "name": "quality",
      "title": "Please indicate if you agree or disagree with the following statements",
      "columns": [
        {
          "value": "agree",
          "text": "Agree"
        },
        {
          "value": "disagree",
          "text": "Disagree"
        }
      ],
      "rows": [
        {
          "value": "affordable",
          "text": "Product is affordable"
        },
        {
          "value": "doeswhatitclaims",
          "text": "Product does what it claims"
        },
        {
          "value": "betterthanother",
          "text": "Product is better than other products on the market"
        },
        {
          "value": "easytouse",
          "text": "Product is easy to use"
        }
      ]
    },
    {
      "type": "comment",
      "name": "disappointedComment",
      "title": "We are really sorry that our products doesn't suite your needs. Could provide us with some comments to help us imporove it?",
      "visibleIf": "rowsWithValue({quality}, 'disagree') >= 3"
    },
    {
      "type": "comment",
      "name": "approvedComment",
      "title": "Thank you for appreciating our product. Could provide us with some comments to make it event better?",
      "visibleIf": "rowsWithValue({quality}, 'agree') >= 3"
    }
  ]
};

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

                    
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Use custom function in expressions, Knockoutjs Survey Library Example</title>
    
<meta name="viewport" content="width=device-width" />
    <script src="https://unpkg.com/knockout@3.5.1/build/output/knockout-latest.js"></script>
    <script src="/DevBuilds/survey-core/survey.core.min.js"></script>
    <script src="/DevBuilds/survey-core/survey.i18n.min.js"></script>
    <script src="/DevBuilds/survey-knockout-ui/survey-knockout-ui.min.js"></script>
    <link href="/DevBuilds/survey-core/defaultV2.min.css" type="text/css" rel="stylesheet" />
    <link rel="stylesheet" href="./index.css">

</head>
<body style="margin: 0">
    
            <div id="surveyElement" style="display:inline-block;width:100%;">
                    <survey params="survey: model"></survey>
                            </div>
    <div id="surveyResult"></div>

<script type="text/javascript" src="./index.js"></script>

</body>
</html>
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