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v 1.9.45

Avoid adding duplicated questions


// register property named 'tag'
    .addProperty("question", {
        name: "tag",
        category: "general"

const options = { questionTypes : [ "text" ] };            
                var creator = new SurveyCreator.SurveyCreator(options);
                        <SurveyCreator.SurveyCreatorComponent creator={creator} />
// assign 'tag' property to some unique value
        name: "countries",
        isCopied: true,
        iconName: "icon-default",
        title: "All countries",
        json: {
            "type": "dropdown",
            placeholder: "Select a country...",
            choicesByUrl: {
                url: ""
            tag: "myItem1"

// Check if existing questions have same tag and cancel add operation
creator.onQuestionAdded.add(function(sender, options) {
    if (options.question.tag) {
        var questions = sender.survey.getAllQuestions();
        for (var i = 0; i < questions.length; i++) {
            if (questions[i] !== options.question && questions[i].tag === options.question.tag) {
<!DOCTYPE html>
<html lang="en">
    <title>Avoid adding duplicated questions, Survey Creator Example</title>
<meta name="viewport" content="width=device-width" />
    <script src=""></script>
    <script src=""></script>
    <script src=""></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" />
    <script src="" type="text/javascript" charset="utf-8"></script>
    <script src="" type="text/javascript" charset="utf-8"></script>
    <!-- Uncomment to enable Select2
    <script src=""></script>
    <link href="" rel="stylesheet" />
    <script src=""></script>
        <script src="/DevBuilds/survey-creator-core/survey-creator-core.min.js"></script>
        <link href="/DevBuilds/survey-creator-core/survey-creator-core.min.css" type="text/css" rel="stylesheet" />
        <script src="/DevBuilds/survey-creator-core/survey-creator-core.i18n.min.js"></script>
        <script src="/DevBuilds/survey-creator-react/survey-creator-react.min.js"></script>
            :root {
                --tab-min-height: 600px;
    <link rel="stylesheet" href="./index.css">

<body style="margin: 0">
<div id="surveyContainer">
            <div id="creatorElement" style="height: 100vh;"></div>

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


This sample demonstrates how to handle the onQuestionAdded event to avoid adding duplicated questions onto the survey designer surface.

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