javascript - AJAX/Jquery - 从 php 文件获取响应

Question

您好，我有一个 php 文件，当我的 ajax/jquery 代码调用它时，它会在 mySQL 表中插入一行。但是我想要某种反馈来了解插入是否成功。这是我当前的代码:

ajax/jquery:

$.ajax({
    url: "update.php",
    success: function(){
        alert("success");    
    },
    error:function(){
        alert("failure");
    }
});

PHP:

$conn = "";
try {
    $conn = new PDO( "mysql:host=XXX;dbname=XXX", "XXX", "XXX");
    $conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
} catch ( PDOException $e ) {
    echo "Cannot connect to database, try again later";
}
$stmt = $conn->prepare("INSERT INTO data (price) VALUES (:price)");
$stmt->bindParam(":price", $price);
$stmt->execute();
$conn=null;

Answer 1

主要示例，您可以做更多的事情来连接反馈与 javascript 处理

$.ajax({
  url: "update.php",
  data: $('#form_id').serialize(),
  dataType: "json",
  timeout: 15000,    
  success: function(response){
    switch(response.status){
      case 'saved':
        alert(response.message); // do what you want
      break;
      case 'empty':
        alert(response.message);
      break;
      default:
        alert("unknown response");
    }  
   },
   error:function(){
    alert("failure");
   }
});


// remote php file
<?php

    // on database success or whatever
      $return_arr["status"] = 'saved';
      $return_arr["message"] = utf8_encode("Your data ".$name." was saved");
      echo json_encode($return_arr);
      exit();

?>