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            Survey.defaultBootstrapCss.navigationButton = "btn btn-green";

                    var json = { elements: [
    type: "dropdown",
    name: "country",
    title: "Select the country...",
    isRequired: true,
    choicesByUrl: {
      "url": "",
      "valueName": "name"
    type: "panel",
    name: "panel_countriesByRegion",
    title: "Show countries by region",
    elements: [{
    type: "dropdown",
    name: "region",
    title: "Select the region...",
    choices: ["Africa", "Americas", "Asia", "Europe", "Oceania"]
  }, {
    type: "dropdown",
    name: "reg_country",
    title: "Select the country...",
    isRequired: true,
    choicesByUrl: {
      "url": "{region}",
      "valueName": "name"


                    window.survey = new Survey.Model(json);
            survey.onComplete.add(function(sender) {
            document.querySelector('#surveyResult').textContent =
            "Result JSON:\n" + JSON.stringify(, null, 3);

<!DOCTYPE html>
<html lang="en">
    <title>Dropdownrestful, Knockoutjs Survey Library Example</title>
<meta name="viewport" content="width=device-width" />
    <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-knockout-ui/survey-knockout-ui.min.js"></script>
    <link rel="stylesheet" href="">
    <link rel="stylesheet" href="./index.css">

<body style="margin: 0">
            <div id="surveyElement" style="display:inline-block;width:100%;">
    <div id="surveyResult"></div>

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


var q = survey.getQuestionByName('country');
q.choicesByUrl.url = 'http://yourrestfulserviceurl';;

var q = survey.getQuestionByName('country');
q.choicesByUrl.path = 'MyPathToTheResult';;

var q = survey.getQuestionByName('country');
q.choicesByUrl.valueName = 'thePropertyNameForValue';;

var q = survey.getQuestionByName('country');
q.choicesByUrl.titleName = 'thePropertyNameForTitle';;


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