How to add a button dynamically using jquery

Your append line must be in your test() function

EDIT:

Here are two versions:

Version 1: jQuery listener

$(function(){
    $('button').on('click',function(){
        var r= $('<input type="button" value="new button"/>');
        $("body").append(r);
    });
});

DEMO HERE

Version 2: With a function (like your example)

function createInput(){
    var $input = $('<input type="button" value="new button" />');
    $input.appendTo($("body"));
}

DEMO HERE

Note: This one can be done with either .appendTo or with .append.

To add dynamic button on the fly;

<!DOCTYPE html>
<html>
<head>
     <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
     <script type="text/javascript">
        function newButtonClickListener() {
                alert("Hello World");
        }
         function test() {
            var r = $('<input/>').attr({
                         type: "button",
                         id: "field",
                         value: "New Button",
                         onclick: "newButtonClickListener()"
                    });

            $("body").append(r);
         }
     </script>
</head>
<body>
     <button onclick="test()">Insert after</button><br/> 
</body>
</html>

Demo link

the $("body").append(r) statement should be within the test function, also there was misplaced " in the test method

function test() {
    var r=$('<input/>').attr({
        type: "button",
        id: "field",
        value: 'new'
    });
    $("body").append(r);    
}

Demo: Fiddle

Update
In that case try a more jQuery-ish solution

<!DOCTYPE html>
<html>
    <head>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
        <script type="text/javascript">
          jQuery(function($){
              $('#mybutton').one('click', function(){
                  var r=$('<input/>').attr({
                      type: "button",
                      id: "field",
                      value: 'new'
                  });
                  $("body").append(r);   
              })
          })
        </script>
    </head>
    <body>
        <button id="mybutton">Insert after</button> 
    </body>
</html>

Demo: Plunker

Try this:

<script type="text/javascript">

function test()
{
    if($('input#field').length==0)
    {
       $('<input type="button" id="field"/>').appendTo('body');
     }
}
</script>

How to add a button dynamically using jquery

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