jTemplates is a template engine 100% in JavaScript.
Example of template:
<table> {#foreach $T.table as row} <tr> <td>{$T.row.name.bold()}</td> <td>{$T.row.mail}</td> </tr> {#/for} </table>
Download, demos, changelog, documentation are available on project homepage: http://jtemplates.tpython.com
