Custom Navigation
Use Custom navigation
External navigation: Prev Next Complete
Survey.Survey.cssType = "bootstrap";
Survey.defaultBootstrapCss.navigationButton = "btn btn-green";
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;
}
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.onComplete.add(function(result) {
    document.querySelector('#surveyResult').innerHTML = "result: " + JSON.stringify(result.data);
});

survey.showTitle = false;

$("#surveyElement").Survey({ 
    model: survey ,onCurrentPageChanged: doOnCurrentPageChanged

});

doOnCurrentPageChanged(survey);
survey.showTitle = false;
<!DOCTYPE html>
<html>
<head>
    <title>Use Custom navigation for plaform jQuery, SurveyJS Library Example</title>
    <script src="https://unpkg.com/jquery"></script>
    <script src="https://surveyjs.azureedge.net/0.12.28/survey.jquery.js"></script>
    <link rel="stylesheet" href="https://unpkg.com/bootstrap@3.3.7/dist/css/bootstrap.min.css">
    <link rel="stylesheet" href="./index.css">

</head>
<body>
        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>
    <hr/><div id="surveyElement">
</div>
<div id="surveyResult"></div>

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

</body>
</html>
.btn-green {
  background-color: #1ab394;
  color: #fff;
  border-radius: 3px;
}
.btn-green:hover, .btn-green:focus {
    background-color: #18a689;
    color: #fff;
}
.panel-footer {
    padding: 0 15px;
    border:none;
    text-align: right;
    background-color: #fff;
}
#surveyPrev, #surveyNext, #surveyComplete {
    color: #1ab394;
}

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;
survey.render();

Page Next Text: default is "Next".

survey.pageNextText = yourValue;
survey.render();

Complete Text: default is "Complete".

survey.completeText = yourValue;
survey.render();

Show Navigation Buttons: default is true.

survey.showNavigationButtons = yourValue;
survey.render();

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

If you use knockout, please use onRedered event to initialized your custom navigation elements.

survey.onCurrentPageChanged.add(function (sender, options) {
    var survey = sender;
    var oldCurrentPage = options.oldCurrentPage;
    var newCurrentPage = options.newCurrentPage;
    //Your code
});
//Requires for knockout platoform only
survey.onRendered.add(function (sender) {
    var survey = sender;
    //Your code
});