新开发的模块内容未出现在网站上。 的Prestashop

sir, In my project i am adding new module. It was added in back office/ modules section. but, not appearing on website. code is as follows..

mymodule.php

<?php
if ( !defined( '_PS_VERSION_' ) )
exit;

class MyModule extends Module
{
public function __construct()
{
$this->name = 'mymodule';
$this->tab = 'mymodule';
$this->version = 1.6;
$this->author = 'Firstname Lastname';
$this->need_instance = 0;
parent::__construct();
$this->displayName = $this->l( 'My module' );
$this->description = $this->l( 'Description of my module' );
$this->ps_versions_compliancy = array('min' => '1.0', 'max' => _PS_VERSION_);
}

public function install()
{
  if (Shop::isFeatureActive())
    Shop::setContext(Shop::CONTEXT_ALL);

  return parent::install() &&
    $this->registerHook('leftColumn') &&
    $this->registerHook('header') &&
    Configuration::updateValue('MYMODULE_NAME', 'my friend');
}

public function hookDisplayLeftColumn($params)
{
  $this->context->smarty->assign(
      array(
          'my_module_name' => Configuration::get('MYMODULE_NAME'),
          'my_module_link' => $this->context->link->getModuleLink('mymodule', 'display')
      )
  );
  return $this->display(__FILE__,'views/templates/hooks/mymodule.tpl');
}

public function hookDisplayRightColumn($params)
{
  return $this->hookDisplayLeftColumn($params);
}

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

?>

mymodule.tpl

location:views/templates/hooks/mymodule.tpl

<!-- Block mymodule -->
<div id="mymodule_block_left" class="block">
  <h4>Welcome!</h4>
  <div class="block_content">
    <p>Hello,
       {if isset($my_module_name) && $my_module_name}
           {$my_module_name}
       {else}
           World
       {/if}
       !       
    </p>   
    <ul>
      <li><a href="{$my_module_link}" title="Click this link">Click me!</a></li>
    </ul>
  </div>
</div>
<!-- /Block mymodule -->

mymodule.css

location:css/mymodule.css

div#mymodule_block_left p {
  font-size: 150%;
  font-style:italic;
}

display.php

location:controllers/front/display.php

<?php
class mymoduledisplayModuleFrontController extends ModuleFrontController
{
  public function initContent()
  {
    parent::initContent();
    $this->setTemplate('display.tpl');
  }
}

display.tpl

location:controllers/front/display.php

<h1>well come !!!!!!!!</h1>

If you are still interested, your mistake seems to be on this line in the public function install():

 $this->registerHook('leftColumn')

It should be:

$this->registerHook('displayLeftColumn')

The "display" keyword seems to be important.

One year later, Prestashop documentation still contains this crucial error.

Note that: public function hookDisplayLeftColumn($params)

don't appear in every pages (by example: it appear in product page, but not the home page).

There are some kind of specific hook for specific page. By example,

$this->registerHook('displayHome')

public function hookDisplayHome()

Added my module in the center of the home page (bellow already hooked modules). All the hooks can be found in the table ps_hook.

Beware: public function hookDisplayRightColumn($params)

doesn't work at all for me.

That page helped me a little bit with the same problem as yours: http://doc.prestashop.com/display/PS16/Managing+Hooks

Well, I guess better worth an answer later than never...

Edit: I found how to activate columns:

In the back office, seek for the menu preferences/themes and click on the "advanced settings" button

enter image description here

Make sure that the columns you want are activated. In the list, click on green check or red X to reverse the visibility of columns in a specific module.

enter image description here