<p id="truncateMe">Lorem ipsum dolor sit amet, consectetuer adipiscing
elit. Aenean consectetuer. Etiam venenatis. Sed ultricies, pede sit
amet aliquet lobortis, nisi ante sagittis sapien, in rhoncus lectus
mauris quis massa. Integer porttitor, mi sit amet viverra faucibus,
urna libero viverra nibh, sed dictum nisi mi et diam. Nulla nunc eros,
convallis sed, varius ac, commodo et, magna. Proin vel
risus. Vestibulum eu urna. Maecenas lobortis, pede ac dictum pulvinar,
nibh ante vestibulum tortor, eget fermentum urna ipsum ac neque. Nam
urna nulla, mollis blandit, pretium id, tristique vitae, neque. Etiam
id tellus. Sed pharetra enim non nisl.</p>

<script type="text/javascript">

var len = 100;
var p = document.getElementById('truncateMe');
if (p) {

  var trunc = p.innerHTML;
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       previous word to ensure that we don't truncate in the middle of
       a word */
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    trunc = trunc.replace(/\w+$/, '');

    /* Add an ellipses to the end and make it a link that expands
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    p.innerHTML = trunc;
  }
}

</script>

truncate text with javascript

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