JToolbar frontend submit value on click
<form action="<?php echo JRoute::_('index.php');?>" method="post"
                name="termForm" id="adminForm">

                <table class="stripeMe">
                    <tbody>


                    <thead>

                        <tr>
                            <th>Begriff</th>
                            <th>Definition</th>



<?php if ($user->authorize('com_glossary', 'edit', 'glossary', 'all')): ?><th>Published</th> <?php endif; ?>

        </tr>
                    </thead>

              <?php foreach($this->items as $i => $item): ?>

            <tr>

                <td>

                <span class="title"><?php echo $item->tterm; ?></span>

                    <?php if ($user->authorize('com_glossary', 'edit', 'bearbeiten', 'all')):?>

                       <?php echo $this->getEdit(); ?><?php endif; ?>

                </td>

               <td><?php echo $item->tdefinition; ?></td>
                 <?php if ($user->authorize('com_glossary', 'edit', 'bearbeiten', 'all')): ?>
               <td><?php echo $this->getPublished(); ?></td> <?php endif; ?>


           </tr>
               <?php endforeach; ?>

    </tbody>
    </table>

                <div>
        <input type="hidden" name="task" value="" /> <input type="hidden"
                        name="id" value="" onclick="submitbutton(<?php echo count( $item->id ); ?>);" /> <input type="hidden"
                        name="option" value="com_glossary" /> <input type="hidden"
                        name="controller" value="bearbeiten" />


        <?php echo JHtml::_('form.token'); ?>
    </div>
            </form>

<input type="hidden" name="boxchecked" value="0" />

<td><?php echo JHTML::_('grid.id', $i, $item->id ); ?></td>