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Hello I'm a newbie and using prestashop 1.6. I would like to implement social link 'LinkedIn' in the module blocksocial which is not actually present. At this stage I have modify the blocksocial.php and the blocksocial.tpl. I can view the new field 'LinkedIn' in the back office when I clicked on 'configure' button on module blocksocial. It successfully saved the new URL but I can't figure how to display the social icon together with its link on the front office.

This is my blocksocial.php:

<?php
/*
* 2007-2016 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Academic Free License (AFL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/afl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to [email protected] so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <[email protected]>
*  @copyright  2007-2016 PrestaShop SA
*  @license    http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

if (!defined('_CAN_LOAD_FILES_'))
	exit;

class blocksocial extends Module
{
	public function __construct()
	{
		$this->name = 'blocksocial';
		$this->tab = 'front_office_features';
		$this->version = '1.2.2';
		$this->author = 'PrestaShop';

		$this->bootstrap = true;
		parent::__construct();

		$this->displayName = $this->l('Social networking block');
		$this->description = $this->l('Allows you to add information about your brand\'s social networking accounts.');
		$this->ps_versions_compliancy = array('min' => '1.6', 'max' => '1.6.99.99');
	}

	public function install()
	{
		return (parent::install() AND Configuration::updateValue('BLOCKSOCIAL_FACEBOOK', '') &&
			Configuration::updateValue('BLOCKSOCIAL_TWITTER', '') &&
			Configuration::updateValue('BLOCKSOCIAL_RSS', '') &&
			Configuration::updateValue('BLOCKSOCIAL_YOUTUBE', '') &&
			Configuration::updateValue('BLOCKSOCIAL_GOOGLE_PLUS', '') &&
			Configuration::updateValue('BLOCKSOCIAL_PINTEREST', '') &&
			Configuration::updateValue('BLOCKSOCIAL_VIMEO', '') &&
			Configuration::updateValue('BLOCKSOCIAL_INSTAGRAM', '') &&
            Configuration::updateValue('BLOCKSOCIAL_LINKEDIN', '') &&
            $this->registerHook('displayHeader') &&
			$this->registerHook('displayFooter'));
	}

	public function uninstall()
	{
		//Delete configuration
		return (Configuration::deleteByName('BLOCKSOCIAL_FACEBOOK') AND
			Configuration::deleteByName('BLOCKSOCIAL_TWITTER') AND
			Configuration::deleteByName('BLOCKSOCIAL_RSS') AND
			Configuration::deleteByName('BLOCKSOCIAL_YOUTUBE') AND
			Configuration::deleteByName('BLOCKSOCIAL_GOOGLE_PLUS') AND
			Configuration::deleteByName('BLOCKSOCIAL_PINTEREST') AND
			Configuration::deleteByName('BLOCKSOCIAL_VIMEO') AND
            Configuration::deleteByName('BLOCKSOCIAL_LINKEDIN') AND
			Configuration::deleteByName('BLOCKSOCIAL_INSTAGRAM') AND
			parent::uninstall());
	}

	public function getContent()
	{
		// If we try to update the settings
		$output = '';
		if (Tools::isSubmit('submitModule'))
		{
			Configuration::updateValue('BLOCKSOCIAL_FACEBOOK', Tools::getValue('blocksocial_facebook', ''));
			Configuration::updateValue('BLOCKSOCIAL_TWITTER', Tools::getValue('blocksocial_twitter', ''));
			Configuration::updateValue('BLOCKSOCIAL_RSS', Tools::getValue('blocksocial_rss', ''));
			Configuration::updateValue('BLOCKSOCIAL_YOUTUBE', Tools::getValue('blocksocial_youtube', ''));
			Configuration::updateValue('BLOCKSOCIAL_GOOGLE_PLUS', Tools::getValue('blocksocial_google_plus', ''));
            Configuration::updateValue('BLOCKSOCIAL_LINKEDIN', Tools::getValue('blocksocial_linkedin', ''));
            Configuration::updateValue('BLOCKSOCIAL_PINTEREST', Tools::getValue('blocksocial_pinterest', ''));
			Configuration::updateValue('BLOCKSOCIAL_VIMEO', Tools::getValue('blocksocial_vimeo', ''));
			Configuration::updateValue('BLOCKSOCIAL_INSTAGRAM', Tools::getValue('blocksocial_instagram', ''));
			$this->_clearCache('blocksocial.tpl');
			Tools::redirectAdmin($this->context->link->getAdminLink('AdminModules').'&configure='.$this->name.'&tab_module='.$this->tab.'&conf=4&module_name='.$this->name);
		}

		return $output.$this->renderForm();
	}

	public function hookDisplayHeader()
	{
		$this->context->controller->addCSS(($this->_path).'blocksocial.css', 'all');
	}

	public function hookDisplayFooter()
	{
		if (!$this->isCached('blocksocial.tpl', $this->getCacheId()))
			$this->smarty->assign(array(
				'facebook_url' => Configuration::get('BLOCKSOCIAL_FACEBOOK'),
				'twitter_url' => Configuration::get('BLOCKSOCIAL_TWITTER'),
				'rss_url' => Configuration::get('BLOCKSOCIAL_RSS'),
				'youtube_url' => Configuration::get('BLOCKSOCIAL_YOUTUBE'),
				'google_plus_url' => Configuration::get('BLOCKSOCIAL_GOOGLE_PLUS'),
				'pinterest_url' => Configuration::get('BLOCKSOCIAL_PINTEREST'),
				'vimeo_url' => Configuration::get('BLOCKSOCIAL_VIMEO'),
				'instagram_url' => Configuration::get('BLOCKSOCIAL_INSTAGRAM'),
                'linkedin_url' => Configuration::get('BLOCKSOCIAL_LINKEDIN'),
			));

		return $this->display(__FILE__, 'blocksocial.tpl', $this->getCacheId());
	}

	public function renderForm()
	{
		$fields_form = array(
			'form' => array(
				'legend' => array(
					'title' => $this->l('Settings'),
					'icon' => 'icon-cogs'
				),
				'input' => array(
					array(
						'type' => 'text',
						'label' => $this->l('Facebook URL'),
						'name' => 'blocksocial_facebook',
						'desc' => $this->l('Your Facebook fan page.'),
					),
					array(
						'type' => 'text',
						'label' => $this->l('Twitter URL'),
						'name' => 'blocksocial_twitter',
						'desc' => $this->l('Your official Twitter account.'),
					),
					array(
						'type' => 'text',
						'label' => $this->l('RSS URL'),
						'name' => 'blocksocial_rss',
						'desc' => $this->l('The RSS feed of your choice (your blog, your store, etc.).'),
					),
					array(
						'type' => 'text',
						'label' => $this->l('YouTube URL'),
						'name' => 'blocksocial_youtube',
						'desc' => $this->l('Your official YouTube account.'),
					),
					array(
						'type' => 'text',
						'label' => $this->l('Google+ URL:'),
						'name' => 'blocksocial_google_plus',
						'desc' => $this->l('Your official Google+ page.'),
					),
					array(
						'type' => 'text',
						'label' => $this->l('Pinterest URL:'),
						'name' => 'blocksocial_pinterest',
						'desc' => $this->l('Your official Pinterest account.'),
					),
					array(
						'type' => 'text',
						'label' => $this->l('Vimeo URL:'),
						'name' => 'blocksocial_vimeo',
						'desc' => $this->l('Your official Vimeo account.'),
					),
					array(
						'type' => 'text',
						'label' => $this->l('Instagram URL:'),
						'name' => 'blocksocial_instagram',
						'desc' => $this->l('Your official Instagram account.'),
					),
                    array(
                        'type' => 'text',
                        'label' => $this->l('URL LinkedIn:'),
                        'name' => 'blocksocial_linkedin',
                        'desc' => $this->l('Your official LinkedIn account.'),
                    ),
				),
				'submit' => array(
					'title' => $this->l('Save'),
				)
			),
		);

		$helper = new HelperForm();
		$helper->show_toolbar = false;
		$helper->table =  $this->table;
		$lang = new Language((int)Configuration::get('PS_LANG_DEFAULT'));
		$helper->default_form_language = $lang->id;
		$helper->allow_employee_form_lang = Configuration::get('PS_BO_ALLOW_EMPLOYEE_FORM_LANG') ? Configuration::get('PS_BO_ALLOW_EMPLOYEE_FORM_LANG') : 0;
		$helper->identifier = $this->identifier;
		$helper->submit_action = 'submitModule';
		$helper->currentIndex = $this->context->link->getAdminLink('AdminModules', false).'&configure='.$this->name.'&tab_module='.$this->tab.'&module_name='.$this->name;
		$helper->token = Tools::getAdminTokenLite('AdminModules');
		$helper->tpl_vars = array(
			'fields_value' => $this->getConfigFieldsValues(),
			'languages' => $this->context->controller->getLanguages(),
			'id_language' => $this->context->language->id
		);

		return $helper->generateForm(array($fields_form));
	}

	public function getConfigFieldsValues()
	{
		return array(
			'blocksocial_facebook' => Tools::getValue('blocksocial_facebook', Configuration::get('BLOCKSOCIAL_FACEBOOK')),
			'blocksocial_twitter' => Tools::getValue('blocksocial_twitter', Configuration::get('BLOCKSOCIAL_TWITTER')),
			'blocksocial_rss' => Tools::getValue('blocksocial_rss', Configuration::get('BLOCKSOCIAL_RSS')),
			'blocksocial_youtube' => Tools::getValue('blocksocial_youtube', Configuration::get('BLOCKSOCIAL_YOUTUBE')),
			'blocksocial_google_plus' => Tools::getValue('blocksocial_google_plus', Configuration::get('BLOCKSOCIAL_GOOGLE_PLUS')),
			'blocksocial_pinterest' => Tools::getValue('blocksocial_pinterest', Configuration::get('BLOCKSOCIAL_PINTEREST')),
			'blocksocial_vimeo' => Tools::getValue('blocksocial_vimeo', Configuration::get('BLOCKSOCIAL_VIMEO')),
			'blocksocial_instagram' => Tools::getValue('blocksocial_instagram', Configuration::get('BLOCKSOCIAL_INSTAGRAM')),
            'blocksocial_linkedin' => Tools::getValue('blocksocial_linkedin', Configuration::get('BLOCKSOCIAL_LINKEDIN')),

        );
	}

}

And this is my blocksocial.tpl: 

<div id="social_block">
	<h4 class="title_block">{l s='Follow us' mod='blocksocial'}</h4>
	<ul>
		{if $facebook_url != ''}<li class="facebook"><a class="_blank" href="{$facebook_url|escape:html:'UTF-8'}">{l s='Facebook' mod='blocksocial'}</a></li>{/if}
		{if $twitter_url != ''}<li class="twitter"><a class="_blank" href="{$twitter_url|escape:html:'UTF-8'}">{l s='Twitter' mod='blocksocial'}</a></li>{/if}
		{if $rss_url != ''}<li class="rss"><a class="_blank" href="{$rss_url|escape:html:'UTF-8'}">{l s='RSS' mod='blocksocial'}</a></li>{/if}
		{if $youtube_url != ''}<li class="youtube"><a class="_blank" href="{$youtube_url|escape:html:'UTF-8'}">{l s='YouTube' mod='blocksocial'}</a></li>{/if}
		{if $google_plus_url != ''}<li class="google_plus"><a class="_blank" href="{$google_plus_url|escape:html:'UTF-8'}" rel="publisher">{l s='Google+' mod='blocksocial'}</a></li>{/if}
		{if $pinterest_url != ''}<li class="pinterest"><a class="_blank" href="{$pinterest_url|escape:html:'UTF-8'}">{l s='Pinterest' mod='blocksocial'}</a></li>{/if}
		{if $vimeo_url != ''}<li class="vimeo"><a href="{$vimeo_url|escape:html:'UTF-8'}">{l s='Vimeo' mod='blocksocial'}</a></li>{/if}
		{if $instagram_url != ''}<li class="instagram"><a class="_blank" href="{$instagram_url|escape:html:'UTF-8'}">{l s='Instagram' mod='blocksocial'}</a></li>{/if}
		{if $linkedin_url != ''}<li class="linkedin"><a class="_blank" href="{$linkedin_url|escape:html:'UTF-8'}">{l s='linkedin' mod='blocksocial'}</a></li>{/if}

	</ul>
</div>

Maybe there is something to be done more but I can't figure it out if someone can help me achieve this please.