Avoid adding duplicated questions


                        

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

const options = { questionTypes : [ "text" ] };            
                var creator = new SurveyCreator.SurveyCreator(options);
            
                
                    ReactDOM.render(
                    <React.StrictMode>
                        <SurveyCreator.SurveyCreatorComponent creator={creator} />
                    </React.StrictMode>,
                    document.getElementById("creatorElement")
                    );
                
// assign 'tag' property to some unique value
creator
    .toolbox
    .addItem({
        name: "countries",
        isCopied: true,
        iconName: "icon-default",
        title: "All countries",
        json: {
            "type": "dropdown",
            placeholder: "Select a country...",
            choicesByUrl: {
                url: "https://surveyjs.io/api/CountriesExample"
            },
            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>Avoid adding duplicated questions, Survey Creator Example</title>
    
<meta name="viewport" content="width=device-width" />
    <script src="https://unpkg.com/react@17.0.1/umd/react.production.min.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.1/umd/react-dom.production.min.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.2.5/babel.min.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-react-ui/survey-react-ui.min.js"></script>
    <link href="/DevBuilds/survey-core/defaultV2.min.css" type="text/css" rel="stylesheet" />
    <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-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>
        <style>
            :root {
                --tab-min-height: 600px;
            }
        </style>
    <link rel="stylesheet" href="./index.css">

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

<script type="text/babel" 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

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