Creating First Extension

Here we introduce IceHrm extensions and covers the steps needed to create a basic extension

Introduction

IceHrm extensions allow developers to extend the features offered by IceHrm without making changes to the IceHrm core. Here we will start building an extension to list some tasks for employees

  • Create the directory icehrm/extensions if it doesn't exist

  • Create a directory named tasks inside icehrm/extensions

Add meta.json file

icehrm
|--extnsions
|--tasks
|--meta.json

The meta.json file for this extension should look like:

{
"label": "My Tasks",
"menu": ["Tasks", "fa-list"],
"icon": "fa-tasks",
"user_levels": [
"Admin",
"Manager",
"User"
],
"model_namespace": "\\Tasks\\Model",
"manager": "\\Tasks\\Extension",
"headless": false
}
  • menu: the name of the main menu and the icon for the main menu

  • label: the name of the menu item that will be created by this extension

  • icon: the icon for the menu that will hold the extension

  • user_levels: which types of users will be able to see and use the extension (in this case Admins / Managers and Employees)

  • headless: if true this extension will not have any UI visibility. It'll just function as a background module

  • manager: the main class which will control the extension

  • model_namespace: the namespace which will hold all the database model classes

Add Extension Manager Class

icehrm
|--extnsions
|--tasks
|--src
|--Tasks
|--Extension.php
|--meta.json

Extension.php

<?php
namespace Tasks;
use Classes\IceExtension;
class Extension extends IceExtension
{
public function install() {
}
public function uninstall() {
}
public function setupModuleClassDefinitions()
{
}
public function setupRestEndPoints()
{
}
}

Adding Extension Include File

Every extension should have an include file with the same name as the extension. In our example, it will be tasks.php

icehrm
|--extnsions
|--tasks
|--src
|--Tasks
|--Extension.php
|--meta.json
|--tasks.php

tasks.php

<?php
require_once __DIR__.'/src/Tasks/Extension.php';

Adding the View file

Every extension must have a view file if it's not running on headless mode. File should always be <extension_dir>/web/index.php

icehrm
|--extnsions
|--tasks
|--src
|--Tasks
|--Extension.php
|--web
|--index.php
|--meta.json
|--tasks.php

web/index.php

<?php
$user = \Classes\BaseService::getInstance()->getCurrentUser();
echo "Welcome ".$user->username;

Here we use a core class from Icehrm to get the currently logged in user

Load the Extension in IceHrm

Visit http://icehrm.os and you should see the My Tasks menu