Just add this code to init() function your Bootstrap class:

elgg_register_external_file('js', 'functions', elgg_get_simplecache_url('js/functions.js'));

elgg_load_external_file('js', 'functions');

elgg_load_external_file('js', 'functions');

I am still getting the error....Can you please go through my code and comment if I had done it right...

This flow was working with older version, but I can't figure out the error.....

So giving you a little trouble, for I tried to change it to the latest version

<?php

namespace Elgg\Curriculum;

use Elgg\DefaultPluginBootstrap;

use Elgg\I18n\NullTranslator;

class Bootstrap extends DefaultPluginBootstrap {

        /**

         * {@inheritDoc}

         */

        public function boot() {

                $this->curriculum_init();

        }

function curriculum_init() {

 elgg_register_menu_item('site', array(

                'name' => 'curriculum',

                'text' => elgg_echo('curriculum'),

                'href' => 'curriculum',

                'href' => 'curriculum/available'

        ));

       elgg_register_external_file('js', 'curriculum', elgg_get_simplecache_url('js/curriculum.js'));

       elgg_load_external_file('js', 'curriculum');

       $this->curriculum_page_handler('curriculum');

        $this->curriculum_page_menu('register', 'menu:page')

}

function curriculum_page_handler($page) {

       elgg_push_breadcrumb(elgg_echo('curriculum'), 'curriculum/available');

if (!isset($page[0])) {

                $page[0] = 'available';

        }

        $vars = array();

        $vars['page'] = $page[0];

        $pages = dirname(__FILE__) . './pages/curriculum';

        switch ($page [0]) {

                case "available" :

                        include "$pages/available.php";

                        break;

                case "teach" :

                        include "$pages/teach.php";

                        break;

                case "learn" :

                        include "$pages/learn.php";

                        break;

                default :

                        return false;

        }

        elgg_pop_context();

        return true;

      }

function curriculum_page_menu($hook, $type, $return, $params) {

         if (elgg_is_logged_in()) {

                // only show side links in curriculum pages

                if (elgg_in_context('curriculum')) {

                        $page_owner = elgg_get_page_owner_entity();

                        if (!$page_owner) {

                                //$page_owner = elgg_get_logged_in_user_entity();

                        }else{

                                $return[0] = new ElggMenuItem('dropbox', elgg_echo('curriculum:dropbox'), 'javascript:syncDropBox("'.$enc>

                                //$return[1] = new ElggMenuItem('uploadBook', elgg_echo('curriculum:uploadbook') , 'javascript:uploadBook>

                        }

                }

        }

        return $return;

        }

This is not relevant to the question you asked.

All I can answer you here is that you cannot include non-existent functions that are not in the extended class.

For example, this code:

function curriculum_init() {}

Use

function init() {} 

instead.

Look at My plugin skeleton plugin

I think you need to learn more about PHP and Elgg or hire someone.

The Curriculum_int() function is working for I am able to register the menu...The java script in not loading

I used to program in Elgg 7-8 years back and am mostly a java developer....

I have not followed what has changed in Php and elgg and am confused a little, and so i am trying to understand it by little trial and error while trying to tweak my old app to the new design... This is how I can register what all has changed by asking questions...And some changes might not register

To hire a developer, I need to know what to ask for and so don't mind my questions....for I am still trying to figure out whether the design that worked in the past is relevant.. So don't mind my childish questions

I figured out a few things about Bootstrap Function or loading external javascript, but don't see the error logs to understand where the mistake is...

HelloWorld Plugin is basic and I understand this...

Do you have a tutorial to load an external javascript file in Bootstrap function...

And how much would a developer charge to convert my old app to the new one...

In addition to the official documentation, you can use the search on this community.

Also read these related Q&As:

https://elgghacks.com/questions/view/3947/require-js

https://elgghacks.com/questions/view/4088/amd-loading-js-issue

https://elgghacks.com/questions/view/5676/how-to-include-three-js-with-orbitcontrols-js-and-objloader-js-into-elgg

https://elgghacks.com/questions/view/5349/javascript-library