Mdl prob

HTML

<html>
  <head>
    <!-- Material Design Lite -->
    <script src="https://code.getmdl.io/1.3.0/material.min.js"></script>
    <link rel="stylesheet" href="https://code.getmdl.io/1.3.0/material.indigo-pink.min.css">
    <!-- Material Design icon font -->
    <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
  </head>
  <body>
    <!-- Simple Textfield -->
      <div class="mdl-textfield mdl-js-textfield">
        <input class="mdl-textfield__input" type="text" id="sample1">
        <label class="mdl-textfield__label" for="sample1">Text...</label>
      </div>
    <div id="container"></div>
    <input type="button" style="width:100px" id="somebutton" />
  </body>
</html>

JavaScript

$("#somebutton").click(function () {
        
        $("#container").append('<div class="mdl-textfield mdl-js-textfield">        <input class="mdl-textfield__input" type="text" id="sample1">        <label class="mdl-textfield__label" for="sample1">Text...</label>      </div>');
       
        
    });