need ajax help

Hi guys,

i am new to wp development. below is my first plugin.
what it does is, it ads a admin panel menu, when click it will show a simple form with one text box and a submit button. the submit method is ajax.
now up to this level all ok. the problem is, i am submitting the request to another php file called update.php in my plugin folder. but in that file, update function not working in that file. it shows

PHP Fatal error: Uncaught Error: Call to undefined function add_action() in /home/v72wdsfiafbt/public_html/wp-content/plugins/haf/update.php:3

Plugin page code

<?php
/**
 * Plugin Name: haf
 * Plugin URI: https://www.antlerweb.xyz
 * Description: a plugin for huf.
 * Version: 1.0
 * Author: antler web solutions
 * Author URI: https://www.antlerweb.xyz
 */

add_action( 'admin_menu', 'add_menu' );

function add_menu(){
    add_menu_page('haf','haf','administrator','haf','haf_menu');
}

function haf_menu () {

   echo "<div class='content'>

    <div id='applynow' class='apply-now'>

        <div class='content'>

            <div class='form'>

                <form id='recipients_form' name='recipients_form' method='' action='' >
                    
                    <div class='input'>
                        
						<input type='text' id='number' name='number' placeholder='Enter Number' required/>
		
						<div id='res'></div>
                        <button type='button' id='submit' class='button'>
                            <a>Submit</a>
                        </button>

                    </div>

                </form>

            </div>

        </div>

    </div>

    </div>    
    
    
    <script>
    
    jQuery('#submit').click(function() {
    	
    	var number = jQuery('#number').val();
    	var dataString =  'number='+ number;
    
        //alert(dataString);
    
    
    	jQuery.ajax({	
          type: 'POST',
          url: '/wp-content/plugins/haf/update.php',
          data: dataString,
          success: function( data, textStatus, jQxhr ){
    			//$('#res').html( data );
    			//$('#contactform').trigger('reset');
    			alert(data);
    			jQuery('#number').val('');
          }
        });
        return false;                        
        

    });

    </script>";  
                    
}

update.php code

<?php

add_action('init', 'process_query');

function process_query(){
    $number = $_POST['number'];
    global $wpdb;
    $table_name = $wpdb->prefix . 'extra_table';
    $wpdb->query("UPDATE $table_name SET number='$number' WHERE record_id=1");
    echo "Record Updated.";
}

• This topic was modified 3 years, 7 months ago by zamaan.
• This topic was modified 3 years, 7 months ago by zamaan.
• This topic was modified 3 years, 7 months ago by Yui. Reason: please use CODE button for code formatting