Use onQuestionAdded event to avoid duplicating questions in survey, Survey Creator Example

Avoid adding duplicated questions

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JavaScript
HTML
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        SurveyCreator.StylesManager.applyTheme("bootstrap");
    

// register property named 'tag'
Survey
    .Serializer
    .addProperty("question", {
        name: "tag",
        category: "general"
    });

var creatorOptions = {questionTypes : [ "text" ]};
var creator = new SurveyCreator.SurveyCreator("creatorElement", creatorOptions);
creator.showToolbox = "right";
creator.showPropertyGrid = "right";
creator.rightContainerActiveItem("toolbox");

// assign 'tag' property to some unique value
creator
    .toolbox
    .addItem({
        name: "countries",
        isCopied: true,
        iconName: "icon-default",
        title: "All countries",
        json: {
            "type": "dropdown",
            optionsCaption: "Select a country...",
            choicesByUrl: {
                url: "https://restcountries.eu/rest/v2/all"
            },
            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) {
                options.question.delete();
                return;
            }
        }
    }
});;

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Use onQuestionAdded event to avoid duplicating questions in survey, Survey Creator 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-knockout/survey.ko.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.4.10/ace.min.js" type="text/javascript" charset="utf-8"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.4.10/ext-language_tools.js" type="text/javascript" charset="utf-8"></script>
    <!-- Uncomment to enable Select2
    <script src="https://unpkg.com/jquery"></script>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
    -->
        <script src="/DevBuilds/survey-creator/survey-creator.min.js"></script>
        <link href="/DevBuilds/survey-creator/survey-creator.min.css" type="text/css" rel="stylesheet" />
    <link rel="stylesheet" href="https://unpkg.com/bootstrap@3.3.7/dist/css/bootstrap.min.css">
    <link rel="stylesheet" href="./index.css">

</head>
<body>
    
<div id="surveyContainer">
        <div id="creatorElement"></div>
</div>

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

</body>
</html>

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

Avoid adding duplicated questions

Use onQuestionAdded event to avoid duplicating questions in survey

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