в Virtuemart 3
/administrator/components/com_virtuemart/models/userfields.php
929 строка
case 'webaddress':
$_return['fields'][$_fld->name]['formcode'] = '<input type="text" id="'
. $_prefix.$_fld->name . '_field" name="' . $_prefix.$_fld->name.'" size="' . $_fld->size
. '" value="' . $_return['fields'][$_fld->name]['value'] .'" '
. ($_fld->required ? ' class="required"' : '')
. ($_fld->maxlength ? ' maxlength="' . $_fld->maxlength . '"' : '')
. $readonly . ' /> ';
break;
меняем на
case 'webaddress':
$_return['fields'][$_fld->name]['formcode'] = '<input type="text" id="'
. $_prefix.$_fld->name . '_field" name="' . $_prefix.$_fld->name.'" size="' . $_fld->size
. '" value="' . $_return['fields'][$_fld->name]['value'] .'"
placeholder="'.$_fld->title.($_fld->required ? '*' : '').'"'
. ($_fld->required ? ' class="required"' : '')
. ($_fld->maxlength ? ' maxlength="' . $_fld->maxlength . '"' : '')
. $readonly . ' /> ';
break;