Ext.js card_wizard Layout

Ext.js card_wizard Layout

<!DOCTYPE html>
<html>
   <head>
      <link href = "https://cdnjs.cloudflare.com/ajax/libs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css"
         rel = "stylesheet" />
      <script type = "text/javascript"
         src = "https://cdnjs.cloudflare.com/ajax/libs/extjs/6.0.0/ext-all.js"></script>

      <script type = "text/javascript">
         Ext.onReady(function() {
            Ext.create('Ext.panel.Panel', {
               renderTo: Ext.getBody(),
               requires: ['Ext.layout.container.Card'],
               layout: 'card',
               width: 600,
               height: 200,
               bodyPadding: 15,

               defaults: {
                  border:false
               },
               defaultListenerScope: true,

               bbar: ['->',
               {
                  itemId: 'card-prev',
                  text: '« Previous',
                  handler: 'showPrevious',
                  disabled: true
               },{
                  itemId: 'card-next',
                  text: 'Next »',
                  handler: 'showNext'
               }],

               items: [{
                  id: 'card0',
                  html: '<h2> This is card wizard layout </h2> <p> This is first card </p> <p> Please click the "Next" button to continue... </p>'
               },{
                  id: 'card1',
                  html: '<p> This is second card </p> <p> Please click the "Next" button for next card and "Previous" button for previous card... </p>'
               },{
                  id: 'card2',
                  html: '<p> This is final card </p> <p> Please click the "Previous" button for previous card... </p>'
               }],

               showNext: function () {
                  this.cardPanelNavigation(1);
               },

               showPrevious: function (btn) {
                  this.cardPanelNavigation(-1);
               },

               cardPanelNavigation: function (incr) {
                  var me = this;
                  var l = me.getLayout();
                  var i = l.activeItem.id.split('card')[1];
                  var next = parseInt(i, 10) + incr;
                  l.setActiveItem(next);
                  me.down('#card-prev').setDisabled(next===0);
                  me.down('#card-next').setDisabled(next===2);
               }
            });
         });
      </script>
   </head>

   <body>
   </body>
</html>