4

I have added the product size randomly and the result was, the numbers added last was shown at the end even if it is smaller than the above size:

example

I have also changed the position in admin panel:

values sort order in the admin

Still not able to arrange the sizes in either descending or ascending order.

1

overwrite block app/code/local/Vendor/Module/etc/config.xml

<config>
    <modules>
        <Vendor_Module>
            <version>1.0.0</version>
        </Vendor_Module>
    </modules>
    <global>
        <blocks>
            <catalog>
                <rewrite>
                    <product_view_type_configurable>Vendor_Module_Block_Product_View_Type_Configurable</product_view_type_configurable>
                </rewrite>
            </catalog>
        </blocks>
    </global>
</config>

app/code/local/Vendor/Module/Block/Product/View/Type/Configurable.php

<?php

class Vendor_Module_Block_Product_View_Type_Configurable extends Mage_Catalog_Block_Product_View_Type_Configurable
{
    /**
     * @var Magento_Db_Adapter_Pdo_Mysql
     */
    protected $_read;

    /**
     * @var string
     */
    protected $_tbl_eav_attribute_option;

    /**
     * Composes configuration for js
     *
     * @version 2014.12.15 - Addition of this line:
     *    $info['options'] = $this->_sortOptions($info['options']);
     *
     * @return string
     */
    public function getJsonConfig()
    {
        $attributes = array();
        $options    = array();
        $store      = $this->getCurrentStore();
        $taxHelper  = Mage::helper('tax');
        $currentProduct = $this->getProduct();

        $preconfiguredFlag = $currentProduct->hasPreconfiguredValues();
        if ($preconfiguredFlag) {
            $preconfiguredValues = $currentProduct->getPreconfiguredValues();
            $defaultValues       = array();
        }

        foreach ($this->getAllowProducts() as $product) {
            $productId  = $product->getId();

            foreach ($this->getAllowAttributes() as $attribute) {
                $productAttribute   = $attribute->getProductAttribute();
                $productAttributeId = $productAttribute->getId();
                $attributeValue     = $product->getData($productAttribute->getAttributeCode());
                if (!isset($options[$productAttributeId])) {
                    $options[$productAttributeId] = array();
                }

                if (!isset($options[$productAttributeId][$attributeValue])) {
                    $options[$productAttributeId][$attributeValue] = array();
                }
                $options[$productAttributeId][$attributeValue][] = $productId;
            }
        }

        $this->_resPrices = array(
            $this->_preparePrice($currentProduct->getFinalPrice())
        );

        foreach ($this->getAllowAttributes() as $attribute) {
            $productAttribute = $attribute->getProductAttribute();
            $attributeId = $productAttribute->getId();
            $info = array(
                    'id'        => $productAttribute->getId(),
                    'code'      => $productAttribute->getAttributeCode(),
                    'label'     => $attribute->getLabel(),
                    'options'   => array()
            );

            $optionPrices = array();
            $prices = $attribute->getPrices();
            if (is_array($prices)) {
                foreach ($prices as $value) {
                    if(!$this->_validateAttributeValue($attributeId, $value, $options)) {
                        continue;
                    }
                    $currentProduct->setConfigurablePrice(
                            $this->_preparePrice($value['pricing_value'], $value['is_percent'])
                    );
                    $currentProduct->setParentId(true);
                    Mage::dispatchEvent(
                            'catalog_product_type_configurable_price',
                            array('product' => $currentProduct)
                    );
                    $configurablePrice = $currentProduct->getConfigurablePrice();

                    if (isset($options[$attributeId][$value['value_index']])) {
                        $productsIndex = $options[$attributeId][$value['value_index']];
                    } else {
                        $productsIndex = array();
                    }

                    $info['options'][] = array(
                            'id'        => $value['value_index'],
                            'label'     => $value['label'],
                            'price'     => $configurablePrice,
                            'oldPrice'  => $this->_prepareOldPrice($value['pricing_value'], $value['is_percent']),
                            'products'  => $productsIndex,
                    );
                    $optionPrices[] = $configurablePrice;
                }
            }

            // CALL SORT ORDER FIX
            $info['options'] = $this->_sortOptions($info['options']);

            /**
             * Prepare formated values for options choose
             */
            foreach ($optionPrices as $optionPrice) {
                foreach ($optionPrices as $additional) {
                    $this->_preparePrice(abs($additional-$optionPrice));
                }
            }
            if($this->_validateAttributeInfo($info)) {
                $attributes[$attributeId] = $info;
            }

            // Add attribute default value (if set)
            if ($preconfiguredFlag) {
                $configValue = $preconfiguredValues->getData('super_attribute/' . $attributeId);
                if ($configValue) {
                    $defaultValues[$attributeId] = $configValue;
                }
            }
        }

        $taxCalculation = Mage::getSingleton('tax/calculation');
        if (!$taxCalculation->getCustomer() && Mage::registry('current_customer')) {
            $taxCalculation->setCustomer(Mage::registry('current_customer'));
        }

        $_request = $taxCalculation->getDefaultRateRequest();
        $_request->setProductClassId($currentProduct->getTaxClassId());
        $defaultTax = $taxCalculation->getRate($_request);

        $_request = $taxCalculation->getRateRequest();
        $_request->setProductClassId($currentProduct->getTaxClassId());
        $currentTax = $taxCalculation->getRate($_request);

        $taxConfig = array(
                'includeTax'        => $taxHelper->priceIncludesTax(),
                'showIncludeTax'    => $taxHelper->displayPriceIncludingTax(),
                'showBothPrices'    => $taxHelper->displayBothPrices(),
                'defaultTax'        => $defaultTax,
                'currentTax'        => $currentTax,
                'inclTaxTitle'      => Mage::helper('catalog')->__('Incl. Tax')
        );

        $config = array(
                'attributes'        => $attributes,
                'template'          => str_replace('%s', '#{price}', $store->getCurrentCurrency()->getOutputFormat()),
                'basePrice'         => $this->_registerJsPrice($this->_convertPrice($currentProduct->getFinalPrice())),
                'oldPrice'          => $this->_registerJsPrice($this->_convertPrice($currentProduct->getPrice())),
                'productId'         => $currentProduct->getId(),
                'chooseText'        => Mage::helper('catalog')->__('Choose an Option...'),
                'taxConfig'         => $taxConfig
        );

        if ($preconfiguredFlag && !empty($defaultValues)) {
            $config['defaultValues'] = $defaultValues;
        }

        $config = array_merge($config, $this->_getAdditionalConfig());    

        return Mage::helper('core')->jsonEncode($config);
    }

    /**
     * Sort the options based off their position.
     *
     * @param array $options
     * @return array
     */
    protected function _sortOptions($options)
    {
        if (count($options)) {
            if (!$this->_read || !$this->_tbl_eav_attribute_option) {
                $resource = Mage::getSingleton('core/resource');

                $this->_read = $resource->getConnection('core_read');
                $this->_tbl_eav_attribute_option = $resource->getTableName('eav_attribute_option');
            }

            // Gather the option_id for all our current options
            $option_ids = array();
            foreach ($options as $option) {
                $option_ids[] = $option['id'];

                $var_name  = 'option_id_'.$option['id'];
                $$var_name = $option;
            }

            $sql    = "SELECT `option_id` FROM `{$this->_tbl_eav_attribute_option}` WHERE `option_id` IN('".implode('\',\'', $option_ids)."') ORDER BY `sort_order`";
            $result = $this->_read->fetchCol($sql);

            $options = array();
            foreach ($result as $option_id){
                $var_name  = 'option_id_'.$option_id;
                $options[] = $$var_name;
            }
        }

        return $options;
    }
}
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