WordPress users in a datatables is not working - ajax

Question

I am making a plugin to display all user info in a DataTables but i am failed. I have about 20k user so i can't use normal table method that's why i use ajax method. Please help me.
I get ajax response like {"draw":0,"recordsTotal":0,"recordsFiltered":0,"data":[]}
This is my table structure
<table id="user_table" class="display table table-striped table-bordered dataTable" style="width:100%">
<thead class="user-table">
<tr>
<th>Email</th>
<th>Name </th>
<th>Url</th>
<th>nickname</th>
<th>description</th>
</tr>
</thead>
<tbody>
</tbody>
</table>
My script
jQuery(document).ready(function($){
var ajaxurl = USERAjax.wpajaxusersearch;
var dataTable = $('#user_table').DataTable({
"processing":true,
"serverSide":true,
"order":[],
"ajax":{
url: ajaxurl,
type:"POST"
},
"columnDefs":[
{
"targets":[0, 3, 4],
"orderable":false,
},
],
});
});
also added localize script like
wp_localize_script( 'jquery', 'USERAjax', array('wpajaxusersearch' => admin_url( 'admin-ajax.php?action=wpajaxusersearch' )) );
and my data fetching function with ajax response
<?php
function wpajaxusersearch(){
$request=$_REQUEST;
global $wpdb;
$sort= "user_registered";
//Build the custom database query to fetch all user IDs
$all_users_id = $wpdb->get_results("SELECT $wpdb->users.ID FROM $wpdb->users ORDER BY %s ASC ", $sort );
$totalData=mysqli_num_rows($all_users_id);
$data=array();
foreach ( $all_users_id as $i_users_id ) {
$user = get_userdata( $i_users_id );
$email = $user->user_email;
$user_fullname =$user->first_name . ' ' . $user->last_name;
$user_url =$user->user_url;
$user_nickname =$user->nickname;
$user_profile =$user->description;
$sub_array = array();
$sub_array[] = $email;
$sub_array[] = $user_fullname;
$sub_array[] = $user_url;
$sub_array[] = $user_nickname;
$sub_array[] = $user_profile;
$data[] = $sub_array;
}
$json_data=array(
"draw" => intval($_POST["draw"]),
"recordsTotal" => intval($totalData),
"recordsFiltered" => intval($totalData),
"data" => $data
);
echo json_encode($json_data);
wp_die(); //to remove that 0 response
}
add_action( 'wp_ajax_wpajaxusersearch', 'wpajaxusersearch' );
add_action( 'wp_ajax_nopriv_wpajaxusersearch', 'wpajaxusersearch' );

Answer 1

Try this code
Your query is wrong
<?php
function wpajaxusersearch(){
$request=$_REQUEST;
global $wpdb;
$sort= "user_registered";
//Build the custom database query to fetch all user IDs
$all_users_id = $wpdb->get_results("SELECT $wpdb->users.ID FROM $wpdb->users ORDER BY $sort ASC " );
$totalData=$wpdb->num_rows;
$data=array();
foreach ( $all_users_id as $i_users_id ) {
$user = get_userdata( $i_users_id->ID);
$email = $user->user_email;
$user_fullname =$user->first_name . ' ' . $user->last_name;
$user_url =$user->user_url;
$user_nickname =$user->nickname;
$user_profile =$user->description;
$sub_array = array();
$sub_array[] = $email;
$sub_array[] = $user_fullname;
$sub_array[] = $user_url;
$sub_array[] = $user_nickname;
$sub_array[] = $user_profile;
$data[] = $sub_array;
}
$json_data=array(
"draw" => intval($_POST["draw"]),
"recordsTotal" => intval($totalData),
"recordsFiltered" => intval($totalData),
"data" => $data
);
echo json_encode($json_data);
wp_die(); //to remove that 0 response
}
add_action( 'wp_ajax_wpajaxusersearch', 'wpajaxusersearch' );
add_action( 'wp_ajax_nopriv_wpajaxusersearch', 'wpajaxusersearch' );