Magento Add wysiwyg editor in custom module.

Step-1

Go to following path and open Edit.php
app\code\local\Namespace\Modulename\Block\Adminhtml\Modulename\Edit.php
and Add this Function

protected function _prepareLayout()
{
    // Load Wysiwyg on demand and Prepare layout
    if (Mage::getSingleton('cms/wysiwyg_config')->isEnabled() && ($block = $this->getLayout()->getBlock('head'))) {
    $block->setCanLoadTinyMce(true);
    }
    parent::_prepareLayout();

}

Step-2

Go to following path and open Form.php
app\code\local\Namespace\Modulename\Block\Adminhtml\Modulename\Edit\Tab\Form.php
and find function protected function_prepareForm() and add

$form = new Varien_Data_Form();
$this->setForm($form);

$form->setHtmlIdPrefix('yourmodulename');
$wysiwygConfig = Mage::getSingleton('cms/wysiwyg_config')->getConfig(array('tab_id' => 'form_section'));
$wysiwygConfig["files_browser_window_url"] = Mage::getSingleton('adminhtml/url')->getUrl('adminhtml/cms_wysiwyg_images/index');
$wysiwygConfig["directives_url"] = Mage::getSingleton('adminhtml/url')->getUrl('adminhtml/cms_wysiwyg/directive');
$wysiwygConfig["directives_url_quoted"] = Mage::getSingleton('adminhtml/url')->getUrl('adminhtml/cms_wysiwyg/directive');
$wysiwygConfig["widget_window_url"] = Mage::getSingleton('adminhtml/url')->getUrl('adminhtml/widget/index');
$wysiwygConfig["files_browser_window_width"] = (int) Mage::getConfig()->getNode('adminhtml/cms/browser/window_width');
$wysiwygConfig["files_browser_window_height"] = (int) Mage::getConfig()->getNode('adminhtml/cms/browser/window_height');
$plugins = $wysiwygConfig->getData("plugins");
$plugins[0]["options"]["url"] = Mage::getSingleton('adminhtml/url')->getUrl('adminhtml/system_variable/wysiwygPlugin');
$plugins[0]["options"]["onclick"]["subject"] = "MagentovariablePlugin.loadChooser('".Mage::getSingleton('adminhtml/url')->getUrl('adminhtml/system_variable/wysiwygPlugin')."', '{{html_id}}');";
$plugins = $wysiwygConfig->setData("plugins",$plugins);

and add this code to display wysiwyg editor

$fieldset->addField('content', 'editor', array(
'name' => 'content',
'label' => Mage::helper('news')->__('Content'),
'title' => Mage::helper('news')->__('Content'),
'style' => 'width:700px; height:500px;',
'wysiwyg' => true,
'required' => true,
'state' => 'html',
'config' => $wysiwygConfig,
));

Step-3

Go to following path and open yourmodulename.xml if its not available than create xml file
app\design\adminhtml\default\default\layout\yourmodulename.xml
and add
<?xml version="1.0"?>
<layout>
  <news_adminhtml_news_edit>
    <update handle="editor"/>
  </news_adminhtml_news_edit>
</layout>

Magento Add Custom Breadcrumbs In custom Module.

Add following code in you modules block file.

public function _prepareLayout()
{
    $breadcrumbs = $this->getLayout()->getBlock('breadcrumbs');
    $breadcrumbs->addCrumb('home', array('label'=>Mage::helper('cms')->__('Home'), 'title'=>Mage::helper('cms')->__('Home Page'), 'link'=>Mage::getBaseUrl()));
    $breadcrumbs->addCrumb('an_alias', array('label'=>'Your label', 'title'=>'Your title', 'link'=>Mage::getUrl("your_module/your_block")));

    return parent::_prepareLayout();
}

Magento Disable Cache For Particular Block Useing XML.

In my case i have disable cache for footer.

<block type="page/html_footer" name="footer" as="footer" template="page/html/footer.phtml">

    <action method="unsetData"><key>cache_lifetime</key></action>
    <action method="unsetData"><key>cache_tags</key></action>
               
</block>

Magento Add Rel Canonical Url

To apply simply click on System > Configuration > Catalog > Search Engine Optimizations Section

Then simply change from no to yes and then click on the “Save Config” button in the top right hand corner.

Magento Add "addAttributeToFilter() function" with Conditionals.

1) Equals: eq

 $_products->addAttributeToFilter('status', array('eq' => 1));

 2) Not Equals - neq

 $_products->addAttributeToFilter('sku', array('neq' => 'test-product'));

 3) Like - like

 $_products->addAttributeToFilter('sku', array('like' => 'UX%'));

 4) Not Like - nlike

 $_products->addAttributeToFilter('sku', array('nlike' => 'err-prod%'));

 5) In - in

 $_products->addAttributeToFilter('id', array('in' => array(1,4,98)));

 6) Not In - nin

 $_products->addAttributeToFilter('id', array('nin' => array(1,4,98)));

 7) NULL - null

 $_products->addAttributeToFilter('description', 'null');

 8) Not NULL - notnull

 $_products->addAttributeToFilter('description', 'notnull');

 9) Greater Than - gt

 $_products->addAttributeToFilter('id', array('gt' => 5));

 10) Less Than - lt

 $_products->addAttributeToFilter('id', array('lt' => 5));

 11) Greater Than or Equals To- gteq

 $_products->addAttributeToFilter('id', array('gteq' => 5));

 12) Less Than or Equals To - lteq

 $_products->addAttributeToFilter('id', array('lteq' => 5));

Magento Arrange Collection in Specific Range Like A-D, 0-9 etc.

Add this code after any collection.

<?php $collection_AtoD->getSelect()->where("name like 'A%' or name like 'B%' or name  like 'C%' or name  like 'D%'"); ?>

Magento Show Discount in Special Price.

Add this code in template > catalog > product > price.phtml

<?php if($_finalPrice < $_price): ?>    
<?php $_savePercent = 100 - round(($_finalPrice / $_price) * 100); $_saveAmount = number_format(($_price - $_finalPrice), 2); ?>        
<p class="yousave">           
    <span class="price-label label">You Save: </span>           
    <span class="price">
        <strong class="save-amount">$<?php echo $_saveAmount; ?></strong> (<?php echo $_savePercent; ?>%)
    </span>
</p>   
<?php endif; ?>