Add a checkbox to Taxonomy

gistfile1.php

// Edit term page
function summit_taxonomy_edit_meta_field($term) {
 
	// put the term ID into a variable
	$t_id = $term->term_id;
 
	// retrieve the existing value(s) for this meta field. This returns an array
	$term_meta = get_option( "taxonomy_$t_id" ); ?>
	<tr class="form-field">
    <th scope="row" valign="top"><label for="term_meta[displayed]"><?php _e( 'Display Category', 'summit' ); ?></label></th>
		<td>
			<input type="checkbox" name="term_meta[displayed]" id="term_meta[displayed]" value="1" <?php if( $term_meta['displayed'] == "1" ) { ?>checked="checked"<?php } ?> ">
			<p class="description"><?php _e( 'Check to have the Category to displayed on the Sales Page','summit' ); ?></p>
		</td>
	</tr>
<?php
}
add_action( 'category_edit_form_fields', 'summit_taxonomy_edit_meta_field', 10, 2 );