Magento 2.1 – Fix Configurable Products Not Showing Options on Product Page

Was the product created programmatically or via import script?

If the configurable product doesn't have a value specified for the options_cointainer attribute, the effect will be similar to the one described by you.

You can solve the problem by saving the configurable product from Admin Panel, selecting a value for the the "Display Product Options in" of the "Design" tab of the product details.

Otherwise the following will do that programmatically:

Mage::getModel('catalog/product')->load()->setOptionsContainer('container1')->save();

or

Mage::getModel('catalog/product')->load()->setOptionsContainer('container2')->save();

Regards

I got the solution to the above requirment..

$product= Mage::getModel('catalog/product')->load($configId);
    #Check if the product has children
    if ($product->type_id == 'configurable') {
        $options = array();
        // Get any super_attribute settings we need
        $productAttributesOptions = $product->getTypeInstance(true)->getConfigurableOptions($product);
        foreach ($productAttributesOptions as $productAttributeOption) {
                    $options[$product->getId()] = array();
                foreach ($productAttributeOption as $optionValues) {
                    $val = $this->trimValue($optionValues['option_title']);
                    $options[$product->getId()][] = array (
                        $optionValues['sku'] =>  $optionValues['attribute_code']."=".$val           
                    ) ;
            }
        }