Ajax不会调用PHP文件

Question

I have a Ajax function which should call search-engine.php but nothing happen.
Here my code:

Ajax:

 $.ajax(){
     type: 'POST',
     url: 'search-engine.php',
     data: {userInput: searchInput},
     success: function(){
     alert('works');
     },
     error: function(){
     alert('something went wrong');
     }
    }

PHP:

<?php
$userInput = $_POST("userInput");
echo $userInput;
?>

And my input is inside a form tag with method post. If is important.

Answer 1

Your Javascript is all messed up. This is how it ought to look (compare and contrast with your code). And read the documentation!

 $.ajax('search-engine.php', {
      type: 'POST',
      data: { userInput:searchInput }
 }).done(function () {
      alert('works');
 }).fail(function () {
      alert('something went wrong');
 });

And in the PHP you are using ( and ). You have to use the [ and ] characters. If you are not getting any errors then you should turn on errors!

<?php
$userInput = $_POST["userInput"];
echo $userInput;