Cheslab

/**
 * Utilize WordPress' media library. Easy select/upload files for your plugin/theme admin page.
 * It uses build-in jQuery 1.4.1
 * Tested with WordPress 5.2.4
 */

$('.my-upload-button').click(function(e) {
  e.preventDefault();

  // setup our media library frame

Cheslab

// jQuery UI is required

<form action="" class="form-filters">
  <label for="from">From</label>
  <input type="text" id="from" name="from">
  <label for="to">to</label>
  <input type="text" id="to" name="to">
  <script>
$(function() {
  var dateFrom = new Date();

Cheslab

// SweetAlert.js is required

$('.trigger').click(function(e) {
  e.preventDefault();
  swal({
    title: "Are you sure?",
    text: "If you're sure click YES",
    icon: "warning",
    buttons: true,
    dangerMode: true

Cheslab

// jQuery UI is required

$("#target_input").autocomplete({
  minLength: 2,
  source: "ajax/autocomplete.php", // expects JSON
  select: function(event, ui) {
    $("#target_input").val(ui.item.label); // display the selected text
    $("#target_input-id").val(ui.item.value); // save selected id to hidden input
    event.preventDefault(); // prevent autocomplete from updating the textbox
    return false; // prevent from inserting id into the input instead of label

Cheslab

<script src="https://api-maps.yandex.ru/2.1/?lang=ru_RU" type="text/javascript"></script>
<div id="map" style="width: 100%; height: 600px"></div>
<script type="text/javascript">

  var elementExists = document.getElementById("map");
  if (elementExists != null) {

    ymaps.ready(init);
    var myMap,
            myPlacemark;

Cheslab

// In order to use an external css file in the plugin's admin panel: 
// 1. Copy following code to the main php file of your plugin (plugins/your_plugin/your_plugin_name.php)
// 2. Create admin.css (or adjust the name below)

function plugin_name_admin_css()
{
  $siteurl = get_option('siteurl');
  $url = $siteurl . '/wp-content/plugins/' . basename(dirname(__FILE__)) . '/admin.css';
  echo "<link rel='stylesheet' type='text/css' href='$url' />\n";
}