php - Value from selected dropdown option cannot be retrieved using $_POST -


i can't seem selected option value select.php value_selected.php file.the console.log(data) displayed nothing. why that?

select.php

<!doctype html>   <html>   <head></head> <body> <script src="js/jquery-3.2.0.min.js"></script>  <form method="post" action=""> <label "sel_opt">select value: </label> <select name="sel_opt" id="sel_opt">     <option value="1">1</option>     <option value="2">2</option> </select> <input name="submit" type="submit" id="submit" value="submit"> </form>  <div id="result"></div>  <script> $(document).ready(function(){              $("#submit").click(function(){               $.ajax({                             url:"http://localhost/value_selected.php",                             type:"post",                             success:function(data)                             {                               console.log(data);                             $('#result').html(data);                             }                        });                   });              });  </script> </body> </html>

value_selected.php

<?php $output = ""; if(isset($_post["submit"])) {  if(isset($_post["sel_opt"])) { $val = $_post["sel_opt"];  if ($val == 1) {         $output = "<p>value 1 selected</p>";  }   else {     $output = "<p>value 2 selected</p>";  }  echo $output; }  ?>

add data: ajax config object form values.

<script> $(document).ready(function(){     $("#submit").click(function(){         $.ajax({             url:"http://localhost/value_selected.php",             type:"post",             data: $('form').serialize(),             success:function(data)             {                 console.log(data);                 $('#result').html(data);             }         });     }); }); </script>

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