<div id='printedArea'>
    <h1>Hello world</h1>
</div>
<input type='button' onclick='print()' value='print me'></input>
<script>
    function print() {
        jsreport.download('report.pdf', {
          template: {
              content: document.getElementById('printedArea').innerHTML,
              engine: 'none',
              recipe: 'phantom-pdf'
        }});
    }
</script>