Surveyjs - Create Help Text

Help Text create for category and question for Surveyjs

use custom property and jquery to add new element

define popupdescription as help text

var json = {
    title: "Software developer survey.",
    pages: [
        { title: "What operating system do you use?", popupdescription:  "Select the operating system you are currently using.",
            questions: [
                {type:"checkbox", name:"opSystem", title: "OS", hasOther: true, isRequired: true, popupdescription:  "If you do not use any of the listed operating system, please select 'others' and type your operating system name.",
                    choices:["Windows", "Linux", "Macintosh OSX"]}
            ]
        },
        {   title: "What language(s) are you currently using?", popupdescription:  "Select all programming languages you have been using for the last six months.", 
            questions: [
            {type:"checkbox", name:"langs",title:"Plese select from the list",popupdescription:  "Select all programming languages you have been using for the last six months.", 
                 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 Lisp", "Haskell", "Lua", "Clojure", 
                    "Matlab", "Arduino", "Makefile", "Groovy", "Puppet", "Rust", "PowerShell"]
            }
        ]},
        { title: "Please enter your name and e-mail", popupdescription:  "We will not share this information with any third-party organization.",
            questions: [
            {type: "text", name: "name", title: "Name:", popupdescription:  "Please, type your name as 'Given Name' 'Family Name'."},
            {type: "text", name: "email", title: "Your e-mail", popupdescription:  "Please, make sure you do not misspell your e-mail."}]
        }]
};

define render option

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

survey.onAfterRenderQuestion.add(function(survey, options){
    //Return if there is no description to show in popup
    if(!options.question.popupdescription) return;
    //Add a button;
    var btn = document.createElement("button");
    btn.type = "button";
    btn.className = "btn btn-info btn-xs";
    btn.innerHTML = "More Info";
    var question = options.question;
    btn.onclick = function() { showDescription(question); }
    var header = options.htmlElement.querySelector("h5");
    var span = document.createElement("span");
    span.innerHTML = "  ";
    header.appendChild(span);
    header.appendChild(btn);
});

survey.onAfterRenderPage.add(function(survey, options){
    //Return if there is no description to show in popup
    if(!options.page.popupdescription) return;
    //Add a button;
    var btn = document.createElement("button");
    btn.type = "button";
    btn.className = "btn btn-info btn-xs";
    btn.innerHTML = "More Info";
    btn.onclick = function() { showDescription(survey.currentPage); }
    var header = options.htmlElement.querySelector("h4");
    var span = document.createElement("span");
    span.innerHTML = "  ";
    header.appendChild(span);
    header.appendChild(btn);
});
$("#surveyElement").Survey({ 
    model: survey 
});