gistfile1.txt

<?php

/**
 * Implements hook_block_info().
 */
function creode_product_types_block_block_info()
{
    $blocks = array();
    $blocks['product_types_block'] = array(
        'info' => t('Product types'),
    );
    return $blocks;
}

/**
 * Implements hook_block_view().
 */
function creode_product_types_block_block_view($delta = '')
{
    $block = array();
    switch ($delta) {
        case 'product_types_block':
            $block['subject'] = '';
            $block['content'] = _product_types_block_content();
            break;
    }
    return $block;
}

function _product_types_block_content()
{
    $last_url_key = end(explode('/', current_path()));
    $output = "";
    $output .= "<select id='facetapi_select_facet_form_1' class='form-select form-item'>";
    $output .= "<optgroup label='Audio'>";
    $output .= "<option value='/product-line/type/audio-pmic-audio'>PMIC + Audio</option>";
    $output .= "<option value='/product-line/type/audio-codecs'>Audio CODECs</option>";
    $output .= "<option value='/product-line/type/audio-amplifiers'>Audio amplifiers</option>";
    $output .= "</optgroup>";

    $output .= "<optgroup label='Connectivity'>";
    $output .= "<option value='/product-line/type/bluetooth-smart'>Bluetooth® Smart</option>";
    // $output .= "<option value='/product-line/type/smartbond-development-tools'>SmartBond Development Tools</option>";
    $output .= "<option value='/product-line/type/voice-over-dect'>Voice over DECT</option>";
    $output .= "<option value='/product-line/type/voice-over-ip'>Voice over IP</option>";
    $output .= "</optgroup>";

    $output .= "<optgroup label='Lighting'>"; 
    $output .= "<option value='/product-line/type/led-drivers-solid-state-lighting'>SSL LED Drivers</option>";
    $output .= "<option value='/product-line/type/led-drivers-backlighting'>Backligh LED Drivers</option>";
    $output .= "</optgroup>";

    $output .= "<optgroup label='Power Conversion'>";
    $output .= "<option value='/product-line/type/acdc-embedded'>AC/DC - Embedded</option>";
    $output .= "<option value='/product-line/type/acdc-power-adapters'>AC/DC - Power Adapters</option>";
    $output .= "<option value='/product-line/type/acdc-rapid-charge-solutions'>AC/DC - Rapid Charge™ Solutions</option>";
    // $output .= "<option value='/product-line/type/acdc-converters'>AC/DC Converters</option>";
    $output .= "</optgroup>";
    
    $output .= "<option value='0'>--Choose--</option>";
    $output .= "<optgroup label='Power management'>";
    $output .= "<option value='/product-line/type/system-pmics'>System PMICs</option>";
    $output .= "<option value='/product-line/type/power-management-pmic-audio'>PMIC + Audio</option>";
    $output .= "<option value='/product-line/type/embedded-pmics'>Embedded PMICs</option>";
    $output .= "</optgroup>";

    $output .= "<optgroup label='Sensors'>";
    $output .= "<option value='/product-line/type/multi-touch'>Multi-Touch</option>";
    $output .= "</optgroup>";    
    // $output .= "<option value='/product-line/type/audio-reference-designs'>Audio reference designs</option>";

    $output .= "</select>";
    return $output;
}