Event Validators

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            Survey.StylesManager.applyTheme("modern");
        

function isNumber(n) { return n && !isNaN(parseFloat(n)) && isFinite(n); }    
   
function surveyValidateQuestion(s, options) {
    if (options.name == 'pricelimit') {
        var leastamount = options.value['leastamount'];
        var mostamount = options.value['mostamount'];
        if(leastamount > mostamount) {
            options.error = "The 'most amount' should be more 'less amount'.";
        }
    }
    if (options.name == 'firstcomputer') {
        if(options.value.indexOf('computer') < 0) {
            options.error = "Please type the word 'computer'.";
        }
    }
}

                
                    var json = {
  "elements": [
    {
      "type": "multipletext",
      "name": "pricelimit",
      "title": "What is the... ",
      "isRequired": true,
      "colCount": 2,
      "items": [
        {
          "name": "leastamount",
          "title": "The least amount you have ever paid for a computer",
          "validators": [
            {
              "type": "numeric",
              "minValue": 10,
              "maxValue": 10000
            }
          ]
        },
        {
          "name": "mostamount",
          "title": "The most amount you have ever paid for a computer",
          "validators": [
            {
              "type": "numeric",
              "minValue": 10,
              "maxValue": 10000
            }
          ]
        }
      ]
    },
    {
      "type": "comment",
      "name": "firstcomputer",
      "title": "Please tell us about your first computer",
      "isRequired": true,
      "validators": [
        {
          "type": "text",
          "minLength": 20
        }
      ]
    }
  ]
};

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

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Event Validators, 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/modern.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/javascript" src="./index.js"></script>

</body>
</html>

Event Validators

Example of using onValidateQuestion event

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