Expression Validator

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            Survey.StylesManager.applyTheme("defaultV2");
        



                
                    var json = {
   "elements": [
    {
     "type": "rating",
     "name": "serviceRate",
     "title": "How do you rate our service?",
     "isRequired": true,
     "rateMax": 10
    },
    {
     "type": "comment",
     "name": "serviceComment",
     "title": "Please write us your opinion about the service (required if you rate us 7 or higher)",
     "validators": [
      {
       "type": "expression",
       "text": "Please tell us your opinion.",
       "expression": "{serviceRate} < 7 or {serviceComment} notempty"
      }
     ]
    }
   ]
};

                    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"));

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Expression Validator, Reactjs Survey Library Example</title>

<meta name="viewport" content="width=device-width" />
    <script src="https://unpkg.com/react@17.0.1/umd/react.production.min.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.1/umd/react-dom.production.min.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.2.5/babel.min.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-react-ui/survey-react-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>
    
            <div id="surveyElement" style="display:inline-block;width:100%;">
            </div>
    <div id="surveyResult"></div>

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

</body>
</html>

Expression Validator

Expression validator

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