Hooks Example

For eg:

add_filter('uwpqsf_tax_field_checkbox', 'customize_checkbox','',12);
function customize_checkbox( $html ,$type,$exc,$hide,$taxname,$taxlabel,$taxall,$opt,$c,$defaultclass,$formid,$divclass){
  $eid = explode(",", $exc);//get the exclude term id in array
  $args = array('hide_empty'=>$hide,'exclude'=>$eid ); setup the arguments for get_terms use, you can change exclude to include if you want, or add any other get_terms parameters

  $terms = get_terms($taxname,$taxoargs); //get the terms
   $count = count($terms);
   if ( $count > 0 ){ //make sure the taxonomy has terms
        $html = ''; //clear the original checbox html
           //below out put the new checkbox html, you can customize it as you like, but there are various important element must present in the html, such as the hidden fields.

           $html  = '<div class="'.$defaultclass.' '.$divclass.' togglecheck" id="tax-check-'.$c.'"><span  class="taxolabel-'.$c.'">'.$taxlabel.'</span >';
				$html .= '<input  type="hidden" name="taxo['.$c.'][name]" value="'.$taxname.'">';//this is must
				$html .= '<input  type="hidden" name="taxo['.$c.'][opt]" value="'.$opt.'">';//this is must
				if(!empty($taxall)){
				$checkall = (isset($_GET['taxo'][$c]['call']) && $_GET['taxo'][$c]['call'] == '1'  ) ? 'checked="checked"' : '';
				$html .= '<label><input type="checkbox" id="tchkb-'.$c.'-0" class="tchkb-'.$c.' chktaxoall" name="taxo['.$c.'][call]"  value="1" '.$checkall.'>'.$taxall.'</label>';
				}
				$i = 1;
				foreach ( $terms as $term ) {
				$value = $term->slug;
				$checked = (isset($_GET['taxo'][$c]['term']) && in_array($value, $_GET['taxo'][$c]['term'])) ? 'checked="checked"' : '';
				$html .= '<label><input type="checkbox" id="tchkb-'.$c.'-'.$i.'" class="tchkb-'.$c.'" name="taxo['.$c.'][term][]" value="'.$value.'" '.$checked.'>'.$term->name.'</label>';
				$i++;
				}
   }

}

Here are the meaning of the function paremters:
$html = original checkbox html output.

$type = the input type, in this case it is ‘checkbox’

$exc = exclude terms id that configured in the search form

$hide = boolean field, to hide or not to hide empty terms.

$taxname = the taxonomy slug, use this when you want specify the customization on certain taxonomy only

$taxlabel = the label of the input field

$taxall = add search all option

$opt = operation such IN , OR

$c = counter for the filter

$defaultclass = class of the filter

$formid = the formid

$divclass = if you have define your own class in the shortcode

Beautiful reply. I’ll give this a go.

Thanks.

Fantastic. This works very well.

One thing that is missing from the code example above is returning $html.

Here is what I have:

function customize_checkbox($html,$type,$exc,$hide,$taxname,$taxlabel,$taxall,$opt,$c,$defaultclass,$formid,$divclass) {

    $eid = explode(",", $exc);
    $args = array('hide_empty'=>$hide,'exclude'=>$eid );
    $terms = get_terms($taxname,$taxoargs); //get the terms
    $count = count($terms);

    if ( $count > 0 ){ //make sure the taxonomy has terms
        $html = ''; //clear the original checkbox html

        $html  = '<div class="'.$defaultclass.' '.$divclass.' togglecheck" id="tax-check-'.$c.'"><span  class="taxolabel-'.$c.'">'.$taxlabel.'</span >';
        $html .= '<input  type="hidden" name="taxo['.$c.'][name]" value="'.$taxname.'">';//this is must
        $html .= '<input  type="hidden" name="taxo['.$c.'][opt]" value="'.$opt.'">';//this is must

        if(!empty($taxall)){
            $checkall = (isset($_GET['taxo'][$c]['call']) && $_GET['taxo'][$c]['call'] == '1'  ) ? 'checked="checked"' : '';
            $html .= '<label><input type="checkbox" id="tchkb-'.$c.'-0" class="tchkb-'.$c.' chktaxoall" name="taxo['.$c.'][call]"  value="1" '.$checkall.'>'.$taxall.'</label>';
        }

        $i = 1;

        foreach ( $terms as $term ) {
            $value = $term->slug;
            $checked = (isset($_GET['taxo'][$c]['term']) && in_array($value, $_GET['taxo'][$c]['term'])) ? 'checked="checked"' : '';
            $html .= '<label><input type="checkbox" id="tchkb-'.$c.'-'.$i.'" class="tchkb-'.$c.'" name="taxo['.$c.'][term][]" value="'.$value.'" '.$checked.'>'.$term->name.'</label>';
            $i++;
        }
    } 

    return $html;

}

add_filter( 'uwpqsf_tax_field_checkbox', 'customize_checkbox', '', 12);

Oh yes, missed that.