Use custom function in expressions

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            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);
            });
        
        
            ReactDOM.render(
            <SurveyReact.Survey model={survey}  />, document.getElementById("surveyElement"));

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Use custom function in expressions

Example of using custom functions in an expression

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