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v 1.9.7
v 1.9.7
Overview Examples Docs Source

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 = {
  "elements": [
      "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(sender) {
            document.querySelector('#surveyResult').textContent =
            "Result JSON:\n" + JSON.stringify(, null, 3);
            model: survey 

<!DOCTYPE html>
<html lang="en">
    <title>Example of creating a custom validator using a custom function in expressions, jQuery Survey Library Example</title>

<meta name="viewport" content="width=device-width" />
    <script src=""></script>
    <script src="/DevBuilds/survey-jquery/survey.jquery.min.js"></script>
    <link href="/DevBuilds/survey-core/survey.min.css" type="text/css" rel="stylesheet" />
    <link rel="stylesheet" href="./index.css">

            <div id="surveyElement" style="display:inline-block;width:100%;">
    <div id="surveyResult"></div>

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