Magento – code working in one phtml file not working in another

As this is marketplace multi vendor site, we are displaying vendor product information in frontend.

List of products informations are displaying as in image :

If we want to edit any information like "Product name, Price, sku, qty....etc", at the last column, you can see "Action" column, below that there is a Edit button, we will click on that and new page will open as below image :

than we will enter the new "Qty value" and click on "save" button. Its working awesome without any problem.

we are using this code for editing quanity button : app/design/frontend/default/default/template/mpassignproduct/editassignproduct.phtml

<li class="fields">
<div class="customer-name">
<div class="field">
<label class="required" for="qty"><em>*</em><?php echo $helper->__('Quantity')?></label>
<div class="input-box">
<input type="text" name="qty" id="qty" value="<?php echo intval($mpAssignProductModel->getQty()) ?>"
 class="required-entry validate-zero-or-greater input-text"/>
</div>
</div>
</div>
</li>

but i want to provide an option to edit the quantity without clicking the "Edit" button present below "Action" column. in the 1st image , you can see "edit" button below "Qty". once we click on that, its displaying as following image :

once we change the value and click on "Update" buton, it show the updated value.
but once we refresh the page, it show old value only.

I used same code in mpassignproduct.phtml . but it didt worked for me.

means code worked editassignproduct.phtml didt worked mpassignproduct.phtml

or did i missed some code ?

so we used following code for editing qty, but this also same problem.

`app/design/frontend/default/default/template/mpassignproduct/mpassignproduct.phtml`  [full code : http://pastebin.com/TSd7CVxC ]

PHtml

    <td>
    <span class="label qty" id="valueqty_<?php echo $assinproducts->getId(); ?>">
        <?php echo intval($assinproducts['qty']); ?>
    </span>

    <input type = "text" id = "qty_<?php echo $assinproducts->getId(); ?>" onkeydown="validateNumbers(event)" 
    name="stock" value="<?php echo intval($assinproducts['qty']); ?>" style="display:none;"/>

    <span class="label wk_action" id="edit_link_<?php echo $assinproducts->getId(); ?>">
        <img onclick="showField('<?php echo $assinproducts->getId(); ?>'); return false;" 
        src="<?php echo $this->getSkinUrl('marketplace/images/icon-edit.png'); ?>"/>
    </span>

    <p id="updatedqty_<?php echo $assinproducts->getId(); ?>" style = "display:none;color:red;">Updated</p><br/>

    <button id="update_button_<?php echo $assinproducts->getId(); ?>" class="button wk_mp_btn1" 
    onclick="updateField('<?php echo $assinproducts->getId(); ?>',<?php echo intval($assinproducts['qty']); ?>); return false;" style="display:none" >
        <span>
            <span style="font-size:12px;"><?php echo $helper->__('Update') ?></span>
        </span>
    </button>

    <button id="reset_button_<?php echo $assinproducts->getId(); ?>" type="reset" class="cancel" 
    onclick="hideReset('<?php echo $assinproducts->getId(); ?>'); return false;" style="display:none"></button> 
</td>

Script

function hideReset(product_id)
    {
        var qtyId='#qty_'+ product_id;
        var editLink="#edit_link_"+ product_id;
        var updateButton="#update_button_"+ product_id;
        var resetButton="#reset_button_"+ product_id;

        $wk_jq(qtyId).hide();
        $wk_jq(editLink).show();
        $wk_jq(updateButton).hide();
        $wk_jq(resetButton).hide();
    }

    function showField(product_id)
    {
        var qtyId           = '#qty_'+ product_id;
        var editLink        = "#edit_link_"+ product_id;
        var updateButton    = "#update_button_"+ product_id;
        var resetButton     = "#reset_button_"+ product_id;

        $wk_jq(qtyId).show();
        $wk_jq(editLink).hide();
        $wk_jq(updateButton).show();
        $wk_jq(updateButton).prop('disabled', false);//just in case
        $wk_jq(resetButton).show();

        return false;
    }



    function updateField(product_id,assignqty)
    {

    //  alert("Hello! I am an alert box!!");
        var qtyId           = '#qty_'+ product_id;
        var valueId         = '#valueqty_'+ product_id;
        var updatedqty      = '#updatedqty_'+ product_id;
        var editLink        = "#edit_link_"+ product_id;
        var updateButton    = "#update_button_"+ product_id;
        var resetButton     = "#reset_button"+ product_id;
        var url             = '<?php echo Mage::getUrl('marketplace/marketplaceaccount/updateField/')?>';

        $wk_jq(qtyId).toggle();
        $wk_jq(editLink).hide();
        $wk_jq(updateButton).show();
        $wk_jq(resetButton).show();

        $qty = $wk_jq(qtyId).val();
        jQuery(valueId).html($qty);
        hideReset(product_id);

        var tmpQty = assignqty+parseInt($qty) ;

        new Ajax.Request(url, {
            method: 'post',
            parameters: {id: product_id, qty: tmpQty},
            onComplete: function (transport) {
            //  alert(tmpQty);
                jQuery(priceId).val($price);                
        jQuery(updatedqty).show().delay(2000).fadeOut();
                $updateButton.prop('disabled', false);
            }
        });
    }

controllers.php

public function updateFieldAction(){

            $stockItem = Mage::getModel('cataloginventory/stock_item')->loadByProduct($product);
            $id= $this->getRequest()->getParam('id');
            $pro=Mage::getModel('catalog/product')->load($id);
            $selllermpassignproduct=Mage::getModel('mpassignproduct/mpassignproduct')->getAssignProDetails($id);
            $customerid=Mage::getSingleton('customer/session')->getCustomerId();
            $collection_product = Mage::getModel('marketplace/product')->getCollection()->addFieldToFilter('mageproductid',array('eq'=>$id))->addFieldToFilter('userid',array('eq'=>$customerid));
            //Mage::getSingleton('core/session')->setEditProductId($id);
            if($selllermpassignproduct['seller_id']==$customerid)
            {

             $assignqty=isset($selllermpassignproduct['assignqty'])?$selllermpassignproduct['assignqty']:0;
             $newq=$pro->getQty()-$assignqty;
             $newqty=$this->getRequest()->getParam('qty')+$newq;
             $connectionresource = Mage::getSingleton('core/resource');
             $connectionWrite = $connectionresource->getConnection('core_write');
             $table1 = $connectionresource->getTableName('mpassignproduct/mpassignproduct');

            $connectionWrite->beginTransaction();

                      $data = array(

                          'assignqty' => $this->getRequest()->getParam('qty'),


                      );

                      $connectionWrite->update($table1, $data, array(
                              'seller_id = ?' => $customerid,
                              'mageproductid = ?' => $id,


                          ));
                      $connectionWrite->commit();

            }else {

            $assignqty=isset($selllermpassignproduct['assignqty'])?$selllermpassignproduct['assignqty']:0;
            $newqty=$this->getRequest()->getParam('qty')+$assignqty;

            }
            $stockItem = Mage::getModel('cataloginventory/stock_item')->loadByProduct($id);
            $stockItem->setData('manage_stock', 1);
            $stockItem->setData('qty', $newqty);

            $stockItem->save();

            $response['message'] = 'Your Product Is Been Sucessfully Updated';
            $this->getResponse()->setBody(Mage::helper('core')->jsonEncode($response)); 
            //Mage::getSingleton('core/session')->addSuccess(Mage::helper('marketplace')->__('Your Product Is Been Sucessfully Updated'));
          }

there are JS errors in console, is there any chance because of following js code , quantity is not saving ? if so how to resolve these errors.