Why AJAX dont´t pass value of name from html File-(JS part) to PHP File using POST?-CodePudding

I tried to pass value of name from .js file to PHP using POST method. But when I start the code, there isn´t any alert.
In console is only: Uncaught ReferenceError: $ is not defined
Do you know what could be improved?

<html>
<body>
<head>
<script type="text/javascript">


const name = "asdasd";

$.ajax({
  url: "TargetFile.php",
  method: "POST",
  data: {
    name
  },
  success: function (result) {
    alert(result);
  },
  error: function (error) {
    alert("Error "   error.status);
  }
})
    
</script>
</head>
</body>
</html>

<?php
  $name = $_POST['name'];
  if (empty($name)) {
    echo "Name is empty";
  } else {
    echo $name;
  }
}
?>

CodePudding user response：

You should put the references to the jquery scripts first i think it's the problem.

CodePudding user response：

You need to load the jQuery lib before using it. And also the head tag should be outside of the body tag.

<html>
    <head>    
        <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj 3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
        <script type="text/javascript">


           const name = "asdasd";

           $.ajax({
               url: "TargetFile.php",
               method: "POST",
               data: {
                   name
               },
               success: function (result) {
                   alert(result);
               },
               error: function (error) {
                   alert("Error "   error.status);
               }
           })

        </script>
    </head>
    <body>
    </body>
</html>

CodePudding user response：

As a simple, single page, test script that will send a POST request to the server which sends the response for the ajax callback. As others have stated - you should include the jQuery library but you need to change the payload to a valid object literal. The POST request expects name=value pairs as per below.

<?php
    if( $_SERVER['REQUEST_METHOD']=='POST' ){
        $result=!empty( $_POST['name'] ) ? $_POST['name'] : 'Name is empty';
        exit( $result );
    }
?>
<!DOCTYPE html>
<html lang='en'>
    <head>
        <meta charset='utf-8' />
        <title>Basic jQuery Ajax POST</title>
        <script src='//code.jquery.com/jquery-latest.js'></script>
        <script>
        
            const name = "Geronimo frequently kicked ass";

            $.ajax({
              url: location.href,   //"TargetFile.php"
              method: "POST",
              data: {
                'name':name
              },
              success: function(result) {
                alert(result);
              },
              error: function(error) {
                alert("Error "   error.status);
              }
            })      
        </script>
    </head>
    <body>
        
    </body>
</html>