1. Developing a widget

Magento widgets allow the administrator of the store with no technical knowledge to easily add dynamic content (for example, including product data) to the pages in Magento stores.

Creating an empty module
Let’s start by creating the module’s directory structure and the main files.The module folder must be located into app/code. Here, you have to decide in which code pool you want to create the module.Usually, you can create your module under the local code pool. Never create a module inside the core folder of Magento and never edit the files inside the core.

 
Module name usually comprises of 2 parts <CompanyName>_<ModuleName> 
or it’s also called <Namespace>_<Module>. 
In our case I will take the name of module as <BookStore_SocialWidget>

1.open the BookStore_SocialWidget.xml file located in the etc folder,and create the file that will enable the module with the following code:

<?xml version="1.0"?>
<config>
    <modules>
        <BookStore_SocialWidget><!-- Name of Module -->
            <active>true</active><!-- This says if the module is active or not -->
            <codePool>local</codePool><!-- This says the location of the module i.e 
inside the local folder. It can also be community folder. -->
            <depends>
                <Mage_Cms/>
            </depends>
        </BookStore_SocialWidget>
    </modules>
</config>

2.Now, let’s create the default module Helper. The default helper should be defined to make the translation subsystem work properly. A Helper in Magento is an object that contains practical methods. You can call it in template files, controllers, models or anywhere in Magento. You need not write any code here. You only need to define a class that extends the core helper, Mage_Core_Helper_Abstract.Open the Data.php file in app/code/local/BookStore/SocialWidget/Helper/ and insert the following code:

<?php
/**
* BookStore Social Widget
*/
class BookStore_SocialWidget_Helper_Data extends Mage_Core_Helper_Abstract{
}

[–If you don’t create this file with the preceding code, the system will generate an error.–]

3.Now to set up the module configuration, we need to create the configuration file called config.xml. Every module has this file and it contains a lot of information such as the module version and the default configurations.It is also used to define the helper and blocks’ base class names.So, let’s create the config.xml file in app/code/local/BookStore/SocialWidget/etc/ with the following code:

<?xml version="1.0"?>
<config>
    <modules>
        <BookStore_SocialWidget>
            <version>0.0.1</version> <!-- Version of module -->
        </BookStore_SocialWidget>
    </modules>
    <global>
        <helpers>
            <socialwidget>
                <class>BookStore_SocialWidget_Helper</class> <!-- Path of Helper Files -->
            </socialwidget>
        </helpers>
        <blocks>
            <socialwidget>
                <class>BookStore_SocialWidget_Block</class><!-- Path of the Block Folder, 
            where all php files are located related to view -->
            </socialwidget>
        </blocks>
    </global>
</config>

4.Then, we need to declare the widgets. All the widgets provided by the module must be declared in the widget.xml file that is located inside the etc folder with the the config.xml file. In the widget.xml file you created,insert the following code that defines a single widget:

<?xml version="1.0"?>
<widgets>
	<socialwidget_icons type="socialwidget/icons">
		<name>Social Sharing Type: Icons</name> <!-- name of widget -->
		<description type="desc">Adds social sharing with Icons</description> <!-- A short 
description of the widget -->
	</socialwidget_icons>
</widgets>

Of course you can define multiple widgets in the same file,for example:

<?xml version="1.0"?>
<widgets>
	<socialwidget_icons type="socialwidget/icons">
		<name>Social Sharing Type: Icons</name>
			<description type="desc">Adds social sharing with Icons</description>
		</socialwidget_icons>
	<socialwidget_buttons type="socialwidget/buttons">
		<name>Social Sharing Type: Buttons</name>
		<description type="desc">Adds social sharing with classics Buttons</description>
	</socialwidget_buttons>
</widgets>

Now we will work with a single widget definition as the first example.As you can see from the preceding code, the widget instance must contain the following information:
• A unique name node used in the system (in our case,socialwidget_icons)
• The widget name
• The type=”…” attribute
• A short description of the widget

5.We will now create the frontend blocks for our widgets.We will create the code that will return an output of the widget in the frontend. To do this, open the Icons.php file you created in app/code/local/BookStore/SocialWidget/Block/Icons.php and add the following code:

<?php
class BookStore_SocialWidget_Block_Buttons extends Mage_Core_Block_Abstract implements Mage_Widget_Block_Interface{
	protected function _toHtml(){
		$html = ' . . .';     // code to be displayed in the frontend
		return $html;
	}
}

We have just created a class that implements an interface, but we don’t have all the methods of that interface because they are already implemented in the ancestors of the method toHtml() class, which is implemented in Mage_Core_Block_Abstract.

6.Now that we have created the frontend block, we need to insert the expected output into HTML. As planned, we want to add the addthis code in the Icons.php file inside the $html variable.

<?php
class BookStore_SocialWidget_Block_Icons extends Mage_Core_Block_Abstract implements Mage_Widget_Block_Interface {
	protected function _toHtml() {
		$html ='<!-- AddThis Button BEGIN -->	
			<div class="addthis_toolbox addthis_default_style addthis_32x32_style">
				<a class="addthis_button_facebook"></a>
				<a class="addthis_button_twitter"></a>
				<a class="addthis_button_pinterest_share"></a>
				<a class="addthis_button_google_plusone_share"></a>
				<a class="addthis_button_compact"></a><aclass="addthis_counter addthis_bubble_style"></a> 
			</div>
			<script type="text/javascript" src="//s7.addthis.com/js/300/addthis_widget.js#pubid=xa-52cae78918520295"></script>
			<!-- AddThis Button END -->';
		return $html;
	}
}

7.Adding the widget to the CMS page
Now our first widget is completed, and we are done with programming. Let’s go to the admin panel and check if our brand new widget is available to be added to either a CMS page or a static block. To do this, follow these steps:

  1. Let’s go to CMS | Pages in the admin panel and add the widget instance on the About Us page. Open it from the list of CMS pages, and click on the Content tab on the left and click insert widget button,A widget selection and configuration pop-up opens with the options of all the available widgets.

  2. Select the new widget Social Sharing Type: Icons and click on the Insert Widget button.
    As you can see in the CMS page content, the result is a short piece of code that calls the widget:
    {{widget type=”socialwidget/icons”}}

  3. Open the page at the frontend and you will see the social sharing icons where you placed the widget. We are done! We’ve just created our first Magento widget.

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