POST请求后，不进入成功回调(javascript)

Question

我的问题是请求 post 请求的页面不见了，然后只显示来自服务器的 JSON 数据字符串。请让我知道如何在不重定向（？）页面的情况下获取响应数据。

客户端POST请求

<!DOCTYPE html>
<html >
<head>
  <meta charset="UTF-8">
  <title>Login Form</title>

  <script
    src="https://code.jquery.com/jquery-3.1.1.min.js"
    integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8="
    crossorigin="anonymous"></script>
  <link rel="stylesheet" type="text/css" href="../../semantic/dist/semantic.min.css">
  <link rel="stylesheet" type="text/css" href="../../semantic/dist/login.css">
  <script
    src="https://code.jquery.com/jquery-3.1.1.min.js"
    integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8="
    crossorigin="anonymous"></script>
  <script src="semantic/dist/semantic.min.js"></script>


  <script type="text/javascript">
      $(document).ready(function() {
        $("#submit").click(function() {
            var form_data = {
                user_id: $("#user_id").val(),
                user_pw: $("#user_pw").val(),
                is_ajax: 1
            };
            $.ajax({
                type: "POST",
                url: '/',
                data: JSON.stringify(form_data),
                contentType: "application/json",
                dataType: "json",
                success: function(response) {
                    console.log('test');
                },
                error : function(response){
                    console.log('test');
                }
            });
        });
      });
      </script>
</head>

<body>
  <div class="ui one column center aligned grid">
<div class="column six wide form-holder">
  <h2 class="center aligned header form-head">Sign in</h2>
  <div class="ui form">
  <form class="form-signin" method="post">
    <div class="field">
      <input type="text" name = "user_id" placeholder="Email">
    </div>
    <div class="field">
      <input type="password" name = "user_pw" placeholder="password">
    </div>
    <div class="field">
      <input type="submit" value="sign in" class="ui button large fluid green">
    </div>
    <div class="field">
      <CENTER><h5><a href = "/register">Register</a></h5></CENTER>
    </div>
    </form>
  </div>
</div>

服务器POST响应

res.writeHead(200, {
'Content-Type': 'application/json'
});
res.end(JSON.stringify({message : "success"}));

结果
{"message":"success"}

Answer 1

为了防止重定向，您应该使用 preventDefault() 函数。

 <script type="text/javascript">
      $(document).ready(function() {
        $("#submit").click(function(e) {
            e.preventDefault();
            var form_data = {
                user_id: $("#user_id").val(),
                user_pw: $("#user_pw").val(),
                is_ajax: 1
            };
            $.ajax({
                type: "POST",
                url: '/',
                data: JSON.stringify(form_data),
                contentType: "application/json",
                dataType: "json",
                success: function(response) {
                    console.log(response);   //->it is not working.
                },
                error : function(response){
                    console.log('fail');
                }
            });
        });
      });
      </script>

Answer 2

如果您想通过 Ajax 请求处理 POST，则不应使用 HTML 发布。

按如下方式更改您的 HTML：

<form class="form-signin">
    <div class="field">
      <input type="text" name = "user_id" placeholder="Email">
    </div>
    <div class="field">
      <input type="password" name = "user_pw" placeholder="password">
    </div>
    <div class="field">
      <input type="button" value="sign in" class="ui button large fluid green">
    </div>
    <div class="field">
      <CENTER><h5><a href = "/register">Register</a></h5></CENTER>
    </div>
</form>

因此删除表单标记上的 POST 方法并删除按钮字段上的 'submit' 类型。我添加了 type="button" 但如果您的 css 处理渲染，您也可以使用 type="text"。

POST请求后，不进入成功回调(javascript)

After POST request, don't get into success call back (javascript)

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