javascript - PHP Ajax response is empty using jQuery -

at moment create register "page". here html code of form

<form class="register_form" method="post" action="insert.php">    <label class="label_register">benutzername*:</label>    <div class="input_group">  	<input class="input_register" id="register_username" name="username" type="text"/><span class="register_span">-</span>    </div>    <label class="label_register">passwort*:</label>    <div class="input_group">  	<input class="input_register" id="register_password_1" name="password" type="password"/><span class="register_span">-</span>    </div>    <label class="label_register">passwort wdh.*:</label>    <div class="input_group">   	<input class="input_register" id="register_password_2" name="password2" type="password"/><span class="register_span">-</span>    </div>    <label class="label_register">e-mail adresse*:</label>    <div class="input_group">  	<input class="input_register" id="register_email" name="email" type="text"/><span class="register_span">-</span>    </div>        <button class="button button_register">jetzt kostenlos registrieren</button>    <p class="register_hint">  	 * pflichtfeld    </p>  </form>

here jquery code

var username_bool = true; var password_bool = true; var email_bool = true; $('.register_form').on('submit', function(){     if(username_bool == true && password_bool == true && email_bool == true){          $.ajax({             type: "post",             url: "insert.php",             data: $(this).serialize(),             success: function(response){                 console.log(response);                 alert(response);             },         });     }     else{         alert("---");     }     return false; }); 

and here php code

<?php if(isset($_post["username"]) && isset($_post["password_1"]) && isset($_post["email"])){     echo "response"; } 

?>

now have sent form, respone empty. use firebug debugg. mistake? , made other mistakes?

thanks help.

you seem checking field named password_1

isset($_post["password_1"]) 

while it's named password

<input class="input_register" id="register_password_1" name="password" type="password"/><span class="register_span">-</span> 

you'll have make sure name attribute matches value you're checking