Kdjykuj

I'm new to Magento and I'm trying to add an additional button to a pre-existing admin form using an observer. I set up my config to what I believe is the right event handle. I created an observer and added the name and method to config. I don't believe my observer is ever hit since Mage log is not printing. Can anyone see where I'm going wrong?

Sales.xml - (Enterprise layout file)

<layout>

   <adminhtml_sales_order_view>

        <reference name="content">

            <block type="adminhtml/sales_order_view" name="sales_order_edit"></block>

        </reference>

   </adminhtml_sales_order_view>

</layout>

config.xml

<?xml version="1.0" encoding="UTF-8"?>



<config>

    <modules>

        <Mycompany_MyModule>

            <version>0.1.0</version>

        </Mycompany_MyModule>

    </modules>

    <global>

        <events>

            <adminhtml_sales_order_view>

                <observers>

                    <my_observer>

                        <type>singleton</type>

                        <class>Mycompany_MyModule_Model_Observer</class>

                        <method>addMyButton</method>

                    </my_observer>

                </observers>

            </adminhtml_sales_order_view>

        </events>

    </global>

</config>

Observer.php

<?php



class Mycompany_MyModule_Model_Observer

{

    public function addMyButton($observer)

    {

        Mage::log('test observer');



        $container = $observer->getBlock();

        if(null !== $container && $container->getType() == 'adminhtml/sales_order_view')

        {

            $data = array(

                'label'     => 'My button',

                'class'     => 'go',

                'onclick'   => 'setLocation(' '  . Mage::getUrl('*/*', array('param' => 'value')) . '')',

            );

            $container->addButton('my_button_identifier', $data);

        }

        return $this;

    }

}

You need to extend layout instead of writing observer.
You cannot dispatch a new event using layout files. Please check more on how to extend layout handles

There is no event with the name <adminhtml_sales_order_view>, it is a layout handle.

You need to use event like <core_block_abstract_prepare_layout_before> as below :

<adminhtml>

        <events>

            <core_block_abstract_prepare_layout_before>

                <observers>

                    .....

                </observers>

            </core_block_abstract_prepare_layout_before>

        </events>

    </adminhtml> 

Reference Links :

• http://inchoo.net/category/magento/events-observers/




• https://www.nicksays.co.uk/magento-events-cheat-sheet-1-9/




• Magento add new Button on Sales order view

FINAL CODE - I did a layout update and it worked for me.

config.xml

<?xml version="1.0" encoding="UTF-8"?>

<config>

    <modules>

        <MyCompany_MyModule>

            <version>0.1.0</version>

        </MyCompany_MyModule>

    </modules>

 <adminhtml>

     <layout>

          <updates>

               <myupdate>

                     <file>myupdate.xml</file>

               </myupdate>

          </updates>

     </layout>

 </adminhtml>

</config>

myupdate.xml

<layout version="0.1.0">

    <adminhtml_sales_order_view>

        <reference name="sales_order_edit">

            <action method="addButton">

                <id>my_button_identifier</id>

                <data>

                    <label>My button</label>

                    <class>go</class>

                </data>

            </action>

        </reference>

    </adminhtml_sales_order_view>

</layout>

Have you defined your <blocks> and <models> within config.xml? If you didnt define models, that will explain why your observer didn't work. Well, that, and the fact that you have a layout handle as your event.

Additionally, instead of

if(null !== $container && $container->getType() == 'adminhtml/sales_order_view')

you should go with

if($container instanceof Mage_Adminhtml_Block_Sales_Order_View)

That's because if you have some module or customization in the future, the "type" may change but it will most likely still extend from the original class.

Additionally, a super helpful tool created by Alan Storm, Commerce Bug. I use it every single day. In fact, it will provide you with a list of available observer events available on a given page.

Also, xdebug is very helpful when debugging Magento. You will know right away if your observer is firing. I made a short video on how to install xdebug. Xdebug Installation