WordPress create advanced custom plugin using OOP

In this example, I am explaining how to add CSS, Java script, ajax in our custom plugin.

Plugin directory structure

mysample.php

<?php 
    /*
    Plugin Name: My Sample Plugin
    Plugin URI: http://www.workassis.com
    Description: My sample plugin it will create a menu in admin and helloworld
    Author: bm
    Version: 2
    Author URI: https://wiki.workassis.com
    */
class SamplePlugin {
	
	public function SamplePlugin() {
		
	    //registering memu
		add_action ( 'admin_menu', array ($this, 'setup_menu' ) );
		
		//registering javascript and css
		wp_register_script ( 'mysample', plugins_url ( 'js/myjs.js', __FILE__ ) );
		wp_register_style ( 'mysample', plugins_url ( 'css/mystyle.css', __FILE__ ) );
		
		//registering ajax call
		add_action("wp_ajax_save_my_settings",  array ($this,"save_my_settings") );
		

	}
	
	function setup_menu() {
		add_menu_page ( 'Sample Plugin Settings', 'Sample page', 'manage_options', 'sample-page-dashboard', array ($this,	'dashboard' ) );
		add_submenu_page ( 'sample-page-dashboard', 'Inner Page', 'Inner Page', 'manage_options', 'inner-page', array ($this,'innerpage_define' ) );
	}
	
	function dashboard() {
	    
	    //implementing the registerd javascript and css in the page
	    wp_enqueue_script('mysample');
	    wp_enqueue_style('mysample');
	    
	    //wp_enqueue_script( 'jquery-ui-sortable');
	    //wp_enqueue_media(); //Enqueues all scripts, styles, settings, and templates necessary to use all media JS APIs.
	    
	    $saved_data =  get_option('save_plugin_settings');
	    $saved_data = $saved_data ? unserialize($saved_data) : null ;
	    
	    include_once (WP_PLUGIN_DIR . '/mysample/dashboard_view.php');
        
	}
	
	function innerpage_define() {
	    
	    wp_enqueue_script('mysample');
	    wp_enqueue_style('mysample');
	    
	    $saved_data =  get_option('save_plugin_settings');
	    
	    $saved_data = $saved_data ? unserialize($saved_data) : null ;
	    
	    include_once (WP_PLUGIN_DIR . '/mysample/innerpage_view.php');

	}
	
	// this function will handle the ajax call
	function save_my_settings() {
	    
	    if(isset($_POST) && isset($_POST['yourname']) ){
	         
	        $saved_data =  get_option('save_plugin_settings');
	        
	        $data['name'] = $_POST['yourname'];
	         
	        if($saved_data) {
	            update_option( 'save_plugin_settings',  serialize($data) );
	        }else{
	            add_option( 'save_plugin_settings',  serialize($data) );
	        }
	        
	    }
	    
	    print_r($data);
	    
	   wp_die();
	}
	
}

$masterpage_obj = new SamplePlugin ();
?>

dashboard_view.php

<div>
 	<h2>Hi this is Dash board</h2>
 	<div>Dashboard contents will come here</div>
 	<div>
 	<?php 
 	
 	echo ($saved_data && isset($saved_data['name']) && $saved_data['name'] !='') ?  'Welcome <span class="mysample-name" >'. $saved_data['name']. '</span>' : '';
 	
 	?>
 	<button class="btn-click-me">Click Me</button>
 	</div>
</div>

innerpage_view.php

<div>

	<h2>This is inner page</h2>

	<form action="" method="post" class="my_form" data-action="save_my_settings">

		Enter Your name<br>
		 
		<input type="text" name="yourname" id="yourname" class="text_box" placeholder="Enter your name" value="<?php echo $saved_data ? $saved_data['name'] : '' ; ?>"> 
		
		<input type="submit" value="Save">
		
	</form>

</div>

mystyle.css

h2{
	color: blue;
    font-weight: bold;
}
.mysample-name{
	 font-style: italic;
}

myjs.js

jQuery('.btn-click-me').click(function(){
	alert('welcome !!!');
});



//data insert & update
jQuery('.my_form').submit(function(e){

	
	jQuery('#loadingDiv').show();
	
	
	var form=jQuery(this); 
	jQuery.ajax({
	    url: ajaxurl+"?action="+form.attr("data-action") ,
	    type: 'POST',
	    data: jQuery(this).serialize(),
	    success: function( data ){
	    	console.log(data);
	    }
	  });
	
	e.preventDefault();
});

For  WordPress create simple custom plugin using OOP refer https://wiki.workassis.com/wordpress-create-simple-custom-plugin-using-oop/

refer

https://developer.wordpress.org/reference/functions/wp_register_script/

https://codex.wordpress.org/Function_Reference/wp_register_style

https://codex.wordpress.org/Plugin_API/Action_Reference/wp_ajax_(action)

https://developer.wordpress.org/reference/functions/wp_enqueue_script/

https://developer.wordpress.org/reference/functions/wp_enqueue_style/

https://developer.wordpress.org/reference/functions/get_option/

https://codex.wordpress.org/Function_Reference/add_option

https://codex.wordpress.org/Function_Reference/update_option

Create simple custom plugin using OOP

Plugin directory structure

Note:-Plugin folder name and the file name should be same

mysample.php

<?php 
    /*
    Plugin Name: My Sample Plugin
    Plugin URI: http://www.workassis.com
    Description: My sample plugin it will create a menu in admin and helloworld
    Author: bm
    Version: 1.0
    Author URI: https://wiki.workassis.com
    */
class SamplePlugin {
	
	public function SamplePlugin() {
		
		add_action ( 'admin_menu', array ($this, 'setup_menu' ) );

	}
	
	function setup_menu() {
		add_menu_page ( 'Sample Plugin Settings', 'Sample page', 'manage_options', 'sample-page-dashboard', array ($this,	'dashboard' ) );
		add_submenu_page ( 'sample-page-dashboard', 'Inner Page', 'Inner Page', 'manage_options', 'inner-page', array ($this,'innerpage_define' ) );
	}
	
	function dashboard() {
	    
        ?>
        <div>
       	 	<h2>Hi this is Dash board</h2>
       	 	<div>Dashboard contents will come here</div>
       	 	<div>
       	 	<?php 
       	 	
       	 	$saved_data =  get_option('save_plugin_settings');
       	 	 
       	 	$saved_data = $saved_data ? unserialize($saved_data) : null ;
       	 	
       	 	echo $saved_data && isset($saved_data['name']) && $saved_data['name'] !='' ?  "Welcome ". $saved_data['name'] : '';
       	 	
       	 	?>
       	 	</div>
        </div>
        <?php
	}
	
	function innerpage_define() {
	    
	    $saved_data =  get_option('save_plugin_settings');
	    
	    $saved_data = $saved_data ? unserialize($saved_data) : null ;
	    
	    if(isset($_POST) && isset($_POST['yourname']) ){
	        
	        $data['name'] = $_POST['yourname'];
	        
	        if($saved_data) {
	            update_option( 'save_plugin_settings',  serialize($data) );
	        }else{
	            add_option( 'save_plugin_settings',  serialize($data) );
	        }
	        
	        $saved_data['name']=$data['name'];
	    }
        ?>
        <div>
        
       	 	<h2>This is inner page</h2>
       	 	
			<form action="" method="post" >
				
				<br>
				Enter Your name<br>
				<input type="text" name="yourname" id="yourname" class="text_box" placeholder="Enter your name"  value="<?php echo $saved_data ? $saved_data['name'] : '' ; ?>" >
				<input type="submit" value="Save" >  
			</form>
		
        </div>
        <?php
	}
	
}

$masterpage_obj = new SamplePlugin ();
?>

You can see the commented line in the top of the file. This is plugin specific information header. WordPress recognize our plugin using this

<?php 
    /*
    Plugin Name: My Sample Plugin
    Plugin URI: http://www.workassis.com
    Description: My sample plugin it will create a menu in admin and helloworld
    Author: bm
    Version: 1.0
    Author URI: https://wiki.workassis.com
    */

Got admin pane and select plugin menu you can see our plugin there

Activate the plugin.

Tadaaaaaaaa…….. see our plugin create a menu and it sub menu

for WordPress create advanced custom plugin using OOP https://wiki.workassis.com/wordpress-create-advanced-custom-plugin-using-oop/