javascript - Adding increment to form input getting TypeError: qty_el is null -


i´m trying add increments in magento grouped items, code should follows javascript returning typeerror: qty_el null. think problem should when pass element id variable, can´t solve this. missing? there way this? hope me.

<div class="add-to-cart">             <div class="qty-button form-group">                  <input type="text" name="super_group_<?php echo $_item->getid() ?>" id="super_group_<?php echo $_item->getid() ?>" maxlength="12" value="<?php echo $_item->getqty() * 1  ?>" title="<?php echo mage::helper('core')->quoteescape($this->__('qty')) ?>" class="input-text qty group-qty form-control" />                  <div class="box-container">                     <div class="box-icon button-plus">                          <input type="button" onclick="incre(2,'super_group_<?php echo $_item->getid() ?>')" class="qty-increase" />                     </div>                     <div class="box-icon button-minus">                         <input type="button" onclick="decre(<?php echo json_encode ($i);?>,'super_group_<?php echo $_item->getid() ?>')" class="qty-decrease" />                     </div>                 </div>              </div>         </div> <script type="text/javascript"> function incre(qty_inc,idname) {     var qty_el = document.getelementbyid(idname);     var qty = qty_el.value;      if( !isnan( qty )){         if(qty_inc>0){                 qty_el.value = number(qty) + qty_inc ;             } else {                 qty_el.value++;             }       }  }  function decre(qty_inc,idname) {     var qty_el = document.getelementbyid(idname);     var qty = qty_el.value;              if(!isnan( qty ) && qty > '0') {                 if(qty_inc>0){                 qty_el.value = number(qty) - qty_inc;                 } else {                     qty_el.value--;                 }             }     }

you can try way increment decrement quantity on grouped products

<label for="qty"><?php echo $this->__('quantity:') ?></label> <a href="javascript:void(0);" onclick="var qty_el = document.getelementbyid('super_group_<?php echo $_item->getid(); ?>'); var qty = qty_el.value; if( !isnan( qty ) && qty > 1 ) qty_el.value--;return false;" class="qty-decrease" > - </a> <input type="text" pattern="\d*" name="super_group[<?php echo $_item->getid() ?>]" id="super_group_<?php echo $_item->getid(); ?>" maxlength="12" value="<?php echo max($this->getproductdefaultqty() * 1, 1) ?>" title="<?php echo $this->__('quantity') ?>" class="input-text qty" /> <a href="javascript:void(0);" onclick="var qty_el = document.getelementbyid('super_group_<?php echo $_item->getid(); ?>'); var qty = qty_el.value; if( !isnan( qty )) qty_el.value++;return false;" class="qty-increase" /> + </a>

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