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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>Test Page</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
  body {
    font-family: sans-serif;
  }
  p {
    margin: 0px;
  }
  input[type=text], #measure {
    font-family: serif;
    font-size: 18pt;
    font-style: normal;
  }
  #measure {
    position: absolute;
    left: -10000px;
    top: 0px;
  }
</style>
</head>
<body>
  <input type='text' id='theField' value=''>
  <span id="measure"></span>
</body>
</html>
 
asdlaskjdoivna alkalao alks aaf
​
 
jQuery(function($) {
  var field;
  
  // Hook up some events for resizing
  field = $("#theField");
  field.bind("change  click keydown keyup", function() {
    resizeIt(field);
  });
  
  // Resize on load
  resizeIt(field);
​
  // Function to do the work
  function resizeIt(field) {
    var measure = $("#measure");
    measure.text(field.val());
    field.css("width", (measure.width()) + "px");
  }
  
});
Output

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