My plugin shows 2 input fields and a button wherever you put the placeholder in WP. After clicking the button it calls a js function which should start a php function using AJAX but somehow i get the error message: "reference error myAjax is not defined"

wsn-plugin.php

function wpb_new_company(){
    echo '<input type="text" class="form-control" id="companyName" placeholder="Firmenname">';
    echo '<input type="text" class="form-control" id="companyYear" placeholder="Jahr">';
    echo '<button onclick="myAjax();" id="btnNewCompany" type="submit" class="btn btn-primary">Erstellen</button>';
}

script.js (which handles all the events)

function myAjax() {
    alert("myAjax gestartet");
      $.ajax({
           type: "POST",
           url: 'localhost/wp/wp-content/plugins/wsn-plugin/wsn-plugin.php',
           data:{action:'call_this'},
           success:function(html) {
             alert(html);
           }

      });
      alert("myAjax ausgeführt");
 }

and again wsn-plugin.php which should then run some function

if($_POST['action'] == 'call_this') {
    echo "i reached it";
}

Changed

function wpb_adding_scripts() {
wp_register_script('wsn_script', plugins_url('script.js', __FILE__), array('jquery'),'1.1', true);
wp_enqueue_script('wsn_script');
}
add_action( 'wp_enqueue_scripts', 'wpb_adding_scripts' );

and js script:

function myAjax() {
    alert("myAjax gestartet");
      $.ajax({
           type: "POST",
           url: '/wp/wp-content/plugins/wsn-plugin/wsn-plugin.php',
           data:{action:'call_this'},
           success:function(html) {
             alert(html);
           }

      });
      alert("myAjax ausgeführt");
 }

no chrome shows the error message: localhost says
fatal error uncaught error call to undefined function add_action() in wsn-plugin.php:16

php可以调用opencv库吗？

qq_29682007

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