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Use onCurrentPageChanged event to update it after the current page is changed.

survey.onCurrentPageChanged.add(function (sender, options) {
    var survey = sender;
    var oldCurrentPage = options.oldCurrentPage;
    var newCurrentPage = options.newCurrentPage;
    //Your code

Get/set the current page No: from 0 to visible page count - 1.

survey.currentPageNo = yourValue;

Page Prev Text: default is "Previous".

survey.pagePrevText = yourValue;

Page Next Text: default is "Next".

survey.pageNextText = yourValue;

Complete Text: default is "Complete".

survey.completeText = yourValue;

Show Navigation Buttons: default is true.

survey.showNavigationButtons = yourValue;

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

window.survey = new Survey.Model({ 
    title: "Software developer survey.",
    pages: [
        { title: "What operating system do you use?",
            questions: [
                {type:"checkbox", name:"opSystem", title: "OS", hasOther: true, isRequired: true, 
                    choices:["Windows", "Linux", "Macintosh OSX"]}
        {   title: "What language(s) are you currently using?",
            questions: [
            {type:"checkbox", name:"langs",title:"Plese select from the list",
                 colCount: 4, isRequired: true,
                choices:["Javascript", "Java", "Python", "CSS", "PHP", "Ruby", "C++", "C", 
                    "Shell", "C#", "Objective-C", "R", "VimL", "Go", "Perl", "CoffeeScript", 
                    "TeX", "Swift", "Scala", "Emacs List", "Haskell", "Lua", "Clojure", 
                    "Matlab", "Arduino", "Makefile", "Groovy", "Puppet", "Rust", "PowerShell"]
        { title: "Please enter your name and e-mail",
            questions: [ 
            {type: "text", name: "name", title: "Name:"}, 
            {type: "text", name: "email", title: "Your e-mail"}]
survey.showTitle = false;
survey.onComplete.add(function(result) {
	document.querySelector('#surveyResult').innerHTML = "result: " + JSON.stringify(;

function doOnCurrentPageChanged(survey) {
    document.getElementById('surveyPrev').style.display = !survey.isFirstPage ? "inline" : "none";
    document.getElementById('surveyNext').style.display = !survey.isLastPage ? "inline" : "none";
    document.getElementById('surveyComplete').style.display = survey.isLastPage ? "inline" : "none";
    document.getElementById('surveyProgress').innerText = "Page " + (survey.currentPageNo + 1) + " of " + survey.visiblePageCount + ".";
    if(document.getElementById('surveyPageNo')) document.getElementById('surveyPageNo').value = survey.currentPageNo;

new Vue({ el: '#surveyElement', data: { survey: survey } });

<!DOCTYPE html>

    <title>Welcome to Vue</title>
    <script src=""></script>
    <link rel="stylesheet" href="">
    <script src=""></script>
    <link rel="stylesheet" href="./index.css">

    External navigation:
    <span id="surveyProgress"></span>  
    <a id="surveyPrev" href="#" onclick="survey.prevPage();">Prev</a>  
    <a id="surveyNext" href="#" onclick="survey.nextPage();">Next</a>  
    <a id="surveyComplete" href="#"  onclick="survey.completeLastPage();">Complete</a>

    <div id="surveyElement">
        <survey :survey='survey'/>
    <div id="surveyResult"></div>
    <script src="./index.js"></script>


.btn-green {
  background-color: #1ab394;
  color: #fff;
  border-radius: 3px;

.btn-green:hover, .btn-green:focus {
    background-color: #18a689;
    color: #fff;

.panel-footer {
    text-align: right;
    background-color: #fff;

#surveyPrev, #surveyNext, #surveyComplete {
    color: #1ab394;