Custom Validators

Example of creating a custom validator using a custom function in expressions

                        function MyTextValidator(params) {
    var value = params[0];
    return value.indexOf("survey");
}
// Register the function for use in SurveyJS expressions
Survey.FunctionFactory.Instance.register("MyTextValidator", MyTextValidator);



var json = {
  "questions": [
    {
      "type": "comment",
      "name": "memo",
      "isRequired": true,
      "title": "Type here 'survey' to pass the validation ",
      "validators": [
        {
          "type": "expression",
          "text": "You text should contains 'survey' word.",
          "expression": "MyTextValidator({memo}) >= 0"
        }
      ]
    }
  ]
};

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);
});


                    
<!DOCTYPE html>
<html>
<head>
    <title>Example of creating a custom validator using a custom function in expressions, Angular2 Survey Library Example</title>


    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://npmcdn.com/zone.js@0.8.17/dist/zone.js"></script>
    <script src="https://npmcdn.com/core-js@2.6.5/client/shim.min.js"></script>
    <script src="https://npmcdn.com/rxjs@5.0.0-beta.6/bundles/Rx.umd.js"></script>
    <script src="https://npmcdn.com/@angular/core@2.0.0-rc.5/bundles/core.umd.js"></script>
    <script src="https://npmcdn.com/@angular/common@2.0.0-rc.5/bundles/common.umd.js"></script>
    <script src="https://npmcdn.com/@angular/compiler@2.0.0-rc.5/bundles/compiler.umd.js"></script>
    <script src="https://npmcdn.com/@angular/platform-browser@2.0.0-rc.5/bundles/platform-browser.umd.js"></script>
    <script src="https://npmcdn.com/@angular/platform-browser-dynamic@2.0.0-rc.5/bundles/platform-browser-dynamic.umd.js"></script>
<script src="https://surveyjs.azureedge.net/1.1.6/survey.angular.js"></script>
<link href="https://surveyjs.azureedge.net/1.1.6/survey.css" type="text/css" rel="stylesheet" />
    <link rel="stylesheet" href="./index.css">

</head>
<body>
            <ng-app></ng-app>
    <div id="surveyResult"></div>

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

</body>
</html>