How to retrieve the date of the itme's version using Ecmascript

Question

Hello, all
I'd like to retrieve the date of minor and major versions using ecmascript. Here is my script so far.
I am getting ID from query string in URL, then passing it to access file.
What I don't understand is to how to instantiate Version class and loop through version to retrieve created date.
Can someone help?
<Sharepoint:ScriptLink name="SP.js" runat="server" OnDemand="true" localizable="false"/>
<pre class="brush: javascript;">
<script language="ecmascript" type="text/ecmascript">
//Get ID of the document
function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
var v_id = getParameterByName('ID');
alert(v_id);
        var item;
        var list;
        var file;
        function fileMajorandMinorVersion() {
            var clientContext = SP.ClientContext.get_current();
            if (clientContext != undefined && clientContext != null) {
                var webSite = clientContext.get_web();
                this.list = webSite.get_lists().getByTitle("List Title");
                this.item = list.getItemById(v_id);
                this.file = this.item.get_file();
                clientContext.load(this.file);
                clientContext.executeQueryAsync(Function.createDelegate(this, this.OnLoadSuccess), Function.createDelegate(this, this.OnLoadFailed));
         function OnLoadSuccess(sender, args) {
            var version = "Major Version: " + this.file.get_majorVersion() + '\n' + "Minor Version: " + this.file.get_minorVersion();
            alert(version)
        function OnLoadFailed(sender, args) {
            alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
        </script>
<input id="btnFileMajorandMinorVersion" onclick="fileMajorandMinorVersion()" type="button" value="File Major and Minor Version"/>
vlad

Answer 1

In order to loop through the version collection and display last version date here is the script that works for me:
<Sharepoint:ScriptLink name="SP.js" runat="server" OnDemand="true" localizable="false"/>
<script language="ecmascript" type="text/ecmascript">
//Get ID of the document
function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
var v_id = getParameterByName('ID');
function convertShortDate(par_date) {
   var var_date = new Date(par_date);
   var day = var_date.getDate();
   var month = var_date.getMonth() + 1;
   var year = var_date.getFullYear();
   var result_date = month+'/'+day+'/'+year;
   return result_date;
        var item;
        var list;
        var file;
        var versions;
        var _version;
        function set_LastCertDate() {
            var clientContext = SP.ClientContext.get_current();
            if (clientContext != undefined && clientContext != null) {
                var webSite = clientContext.get_web();
                this.list = webSite.get_lists().getByTitle("Archer Pages");
                this.item = list.getItemById(v_id);
                this.file = this.item.get_file();
                this.versions = this.file.get_versions()               
                clientContext.load(this.file);
                clientContext.load(this.versions)
                clientContext.executeQueryAsync(Function.createDelegate(this, this.OnLoadSuccess), Function.createDelegate(this, this.OnLoadFailed));
         function OnLoadSuccess(sender, args) {
         var output = "";
         var certdate = "";
         var listItemEnumerator = this.versions.getEnumerator();
         // loop through the version items
         while (listItemEnumerator.moveNext())
          var oVersionItem = listItemEnumerator.get_current();
          certdate = oVersionItem.get_created();
          $("input[title='CertificateDate']").val(convertShortDate(certdate));
        function OnLoadFailed(sender, args) {
            alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
       document.write("<input name='Button1' type='button' value='Populate Certificate Date' onclick='set_LastCertDate()'/>");
    </script>
vlad