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Complex questions in expressions

Example of using complex questions values in an expression


                        
        
            Survey.StylesManager.applyTheme("modern");
        


            
                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);
            });
        
        
            function onAngularComponentInit() {
            Survey.SurveyNG.render("surveyElement", {
            model: survey 
            });
            }
            var HelloApp =
            ng.core
            .Component({
            selector: 'ng-app',
            template: '<div id="surveyContainer" class="survey-container contentcontainer codecontainer"><div id="surveyElement"></div></div> '})
            .Class({
            constructor: function() {
            },
            ngOnInit: function() {
            onAngularComponentInit();
            }
            });
            document.addEventListener('DOMContentLoaded', function() {
            ng.platformBrowserDynamic.bootstrap(HelloApp);
            });
        

                    
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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}"