1 – Now if you want create custom action oro platform have perfect technique for handling the datagrid and put your custom action link in any grid .
First create folder extension inside your bundle Extension/Action/Actions/GetpdfAction.php
 
I want extend ajax action behavior for that I will extends :
Oro\Bundle\DataGridBundle\Extension\Action\Actions\AjaxAction;
the content of the class

<?php
namespace Ibnab\Bundle\PmanagerBundle\Extension\Action\Actions;
use Oro\Bundle\DataGridBundle\Extension\Action\ActionConfiguration;
use Oro\Bundle\DataGridBundle\Extension\Action\Actions\AjaxAction;
class GetpdfAction extends AjaxAction
{
/**
* @var array
*/
protected $requiredOptions = [  'entity_name', 'data_identifier'];
public function getOptions()
{
$options = parent::getOptions();
$options['frontend_type'] = 'getpdf';
if (empty($options['frontend_handle'])) {
$options['frontend_handle'] = 'getpdf';
}
return $options;
}
}
 

see the frontend type is very important part  is the link between your action and custom js in second section 'getpdf-action.js'

getpdf-action.js
Second now you need create requirejs.yml for declaring your custom js yes is for customize options , change message route or other for more info about all options go to :
/vendor/oro/platform/src/Oro/Bundle/DataGridBundle/Resources/public/js/datagrid/action/abstract-action.js
ok inside requirejs.yml put :
 

 
config:
    paths:
        'oro/datagrid/action/getpdf-action': 'bundles/ibnabpmanager/js/datagrid/action/getpdf-action.js'
   

And create file  getpdf-action.js inside  your custom bundle like:  Ibnab/Bundle/PmanagerBundle/Resources/public/js/datagrid/action/getpdf-action.js
put that :
 

 
/*global define*/
define([
'oro/datagrid/action/model-action'
], function (ModelAction) {
'use strict';
 
    var GetpdfAction;
 
    /**
    * Ajax action, triggers REST AJAX request
    *
    * @export  oro/datagrid/action/getpdf-action
    * @class   oro.datagrid.action.GetpdfAction
    * @extends oro.datagrid.action.ModelAction
    */
 
    GetpdfAction = ModelAction.extend({
        defaultMessages: {
           confirm_title: 'Execution Confirmation',
           confirm_content: 'Are you sure you want to do this?',
           confirm_ok: 'Yes, do it',
           confirm_cancel: 'Cancel',
           success: 'Action performed.',
           error: 'Action is not performed.',
           empty_selection: 'Please, select item to perform action.'
       }
   });
 
    return GetpdfAction;
});
 

Third  now I want add my custom action to contact datagrid inside datagrid.yml of my custom option I will add :
 

 
datagrid:
    contacts-grid:
        properties:
            getpdf_link:
                type:       url
                route:      pmanager_default_getpdf
                params:     [ id ]
        actions:
            getpdf:
                type: getpdf
                data_identifier: c.id
                frontend_handle: dialog
                frontend_options:
                    title: 'Address Book'
                entity_name: %orocrm_contact.entity.class%
                acl_resource: pmanager_defaut_getpdf
                label: pmanager_defaut_getpdf
                icon: eye-open
                confirmation: true
                link: getpdf_link
  

Fourthly oh don't forget creating service inside example action.yml with content :
 

 
parameters:
    ibnab_pmanager.extension.action.type.getpdf.class:    Ibnab\Bundle\PmanagerBundle\Extension\Action\Actions\GetpdfAction
 
services:
    ibnab_pmanager.extension.action.type.getpdf:
        class: %ibnab_pmanager.extension.action.type.getpdf.class%
        scope: prototype
        tags:
            - { name: oro_datagrid.extension.action.type, type: getpdf }
  

inside IbnabPmanagerExtension.php add :
 

 
 $loader->load('actions.yml');
   

to function load
 
You can play now with it enter to contact grid page :
and refresh customize your getpdf-action.js and see if have action if not is note loaded
I find small truck for see if is loaded with my frontend-type I go to :
/opt/lampp/htdocs/alloro/oc2/vendor/oro/platform/src/Oro/Bundle/DataGridBundle/Resources/public/js/map-action-module-name.js
and I change the code to :
 

 
/*global define*/
define(function () {
    'use strict';
     var moduleNameTemplate = 'oro/datagrid/action/{{type}}-action';
     return function (type) {
         alert(moduleNameTemplate.replace('{{type}}', type));
         return moduleNameTemplate.replace('{{type}}', type);
     };
});
   

this js maped every action with it js  based on frontend-type
and shift + ctrl + f5 = it will be show all loaded action by frontend-type and the js related to this action
 
More resources on the same project see all folder :
/opt/lampp/htdocs/alloro/oc2/vendor/oro/platform/src/Oro/Bundle/DataGridBundle/Resources/public/js/datagrid/action/
 
And folder :
/opt/lampp/htdocs/alloro/oc2/vendor/oro/platform/src/Oro/Bundle/DataGridBundle/Extension/Action/Actions
 
See DatagridBunlde genraly in oro platform
 
For testing with changing js don't forget :
rm -rf web/bundles/*
php app/console assets:install
 
Five more on-line resource
http://www.orocrm.com/forums/topic/%D1%81ustom-javascript-action
http://www.orocrm.com/forums/topic/custom-mass-actions
http://www.orocrm.com/forums/topic/how-to-get-the-data-from-datagrid-action
http://www.orocrm.com/forums/topic/hdi-open-dialog-from-datagrid
https://github.com/orocrm/platform/blob/master/src/Oro/Bundle/DataGridBundle/Resources/doc/backend/datagrid.md
https://www.youtube.com/watch?v=WJZ98akh8tM