update cart from view page using ajax in magento 1.9
<p>Add to cart works fine on view page. Items are updated dynamically. But Update cart doesnt update header cart items. Items are updated after refresh.</p>

<p>checkout/cart/item/configure/updatecart.phtml</p>

<pre><code>&lt;?php $_product = $this-&gt;getProduct(); ?&gt;
&lt;?php $buttonTitle = $this-&gt;__('Update Cart'); ?&gt; 
&lt;?php if($_product-&gt;isSaleable()): ?&gt;
&lt;div class="add-to-cart"&gt;
    &lt;?php if (!$_product-&gt;isGrouped()): ?&gt;
    &lt;div class="qty-wrapper"&gt;
        &lt;label for="qty"&gt;&lt;?php echo $this-&gt;__('Qty:') ?&gt;&lt;/label&gt;
        &lt;input type="text" pattern="\d*" name="qty" id="qty" maxlength="12" value="&lt;?php echo $this-&gt;getProductDefaultQty() * 1 ?&gt;" title="&lt;?php echo $this-&gt;__('Qty') ?&gt;" class="input-text qty" /&gt;
    &lt;/div&gt;
    &lt;?php endif; ?&gt;
    &lt;div class="add-to-cart-buttons"&gt;
        &lt;button type="button" title="&lt;?php echo $buttonTitle ?&gt;" class="button btn-cart" onclick="productAddToCartForm.submit(this)"&gt;&lt;span&gt;&lt;span&gt;&lt;?php echo $buttonTitle ?&gt;&lt;/span&gt;&lt;/span&gt;&lt;/button&gt;
        &lt;span id='ajax_loader' style='display:none'&gt;&lt;img src='&lt;?php echo $this-&gt;getSkinUrl('images/opc-ajax-loader.gif')?&gt;'/&gt;&lt;/span&gt;
        &lt;?php echo $this-&gt;getChildHtml('', true, true) ?&gt;
    &lt;/div&gt;
&lt;/div&gt;
</code></pre>



<p>view.phtml</p>

<pre><code>    &lt;script type="text/javascript"&gt;
//&lt;![CDATA[
    var productAddToCartForm = new VarienForm('product_addtocart_form');
    productAddToCartForm.submit = function(button, url) {
    if (this.validator.validate()) {
        var form = this.form;
        var oldUrl = form.action;
        if (url) {
            form.action = url;
        }
        var e = null;
        // Start of our new ajax code
        if (!url) {
            url = jQuery('#product_addtocart_form').attr('action');
        }
        url = url.replace("checkout/cart","ajax/index"); // New Code
        var data = jQuery('#product_addtocart_form').serialize();
        data += '&amp;isAjax=1';
        jQuery('#ajax_loader').show();
            try {
                jQuery.ajax({
                  url: url,
                  dataType: 'json',
                  type : 'post',
                  data: data,
                  success: function(data){     
                      console.log(data);
                        jQuery('#ajax_loader').hide();
                        alert(data.message);
                        //console.log(url);
                        if(jQuery('#gd_total')){ 
                             jQuery("#gd_total").html( jQuery(data).find('#gd_total'));
                        }

                        if(jQuery('.count')){
                             var count=jQuery(data.toplink).find('.count').text();
                             jQuery(".count").html(count);
                              jQuery(".skip-cart").removeClass("no-count");
                        }      
                        if(jQuery('.minicart-wrapper')){ 
                           // jQuery('.header-minicart').replaceWith(data.toplink);
                           var cart=jQuery(data.toplink).find('.minicart-wrapper').html();
                             jQuery(".minicart-wrapper").html(cart);
                        }                             

                  }
            });
            }  catch (e) {
        }
        // End of our new ajax code
        this.form.action = oldUrl;
        if (e) {
            throw e;
        }
    }
}.bind(productAddToCartForm);
productAddToCartForm.submitLight = function(button, url){
        if(this.validator) {
            var nv = Validation.methods;
            delete Validation.methods['required-entry'];
            delete Validation.methods['validate-one-required'];
            delete Validation.methods['validate-one-required-by-name'];
            if (this.validator.validate()) {
                if (url) {
                    this.form.action = url;
                }
                this.form.submit();
            }
            Object.extend(Validation.methods, nv);
        }
    }.bind(productAddToCartForm);
//]]&gt;
&lt;/script&gt;
</code></pre>