javascript - can't figure out why ajax json request to server fails -

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i learning how make ajax request jquery , json. have following code:

jquery 

 $(document).ready(function(){      				$(document).on('submit','#form', function(e){      					e.preventdefault();      					var nombre = $("#nombre").val();      					var apellido = $("#apellido").val();      					alert(nombre+apellido);      					sendajax(nombre,apellido);      				});      				      				function sendajax(nombre,apellido){      				        $.ajax({      				                data:  {      				                    "nombre": nombre,      				                    "apellido": apellido      				                },      				                contenttype:"application/json",      				                datatype: 'json',      				                url:   'ajax/ajax.php',      				                type:  'post'      				        })      				        .done (function(response) {      							alert(response.nombre);      				    	})      				    	.fail (function() {      				        	alert("failed");      				    	});      				}      			});

**ajax.php** 

if(isset($_post['nombre'])){  	$json_data = array ('nombre' => $_post['nombre'] , 'apellido' => $_post['apellido']);  	header('content-type: application/json; charset=utf-8');  	echo json_encode(json_data);  }

as can see i'm not passing inputs values form, expecting alert string "nombre" (only testing purposes). request keeps failing , can't figure out why. wrong in code?


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