request.args.get()返回None类型值(None)

时间:2019-11-06 15:56:43

标签: javascript python html

我正在尝试检查登录表单上的用户输入。我正在向服务器发送HTTP请求,以检查数据库中的用户名。这是网络网址:https://bceec5a5-eba3-49e3-b255-d3976d185fad-ide.cs50.xyz:8080/user_name?username=fabianomobono

这是html

<form id="login_form" action='/home' method='post'>
        <input id="login_credentials_username" name='login_username' type='text' placeholder='Username' >
        <input id="login_credentials_password" name='login_password' type='password' placeholder="Password" >
        <button class="btn btn-primary" type='submit'>Log in</button>
      </form>

这是JS:

$('#login_form').ready(function() {

    $('#login_form').on('submit', function(e) {

        e.preventDefault();
        logincheck();

    });
});

    function logincheck(){
        var username = document.getElementById("login_credentials_username").value;
        var password = document.getElementById("login_credentials_password").value;

        if (username == ''){
          alert("no user");
          return false;
        }
        else if (password == ''){
           alert('no password');
           return false;
        }

        else if (password && username){
            alert(password + username);
            console.log(username)
            $.get('/user_name?username=' + username, function(r){
                if (r === false){
                    alert('python returned false');
                    return false;
                }

                else{
                    alert('python returned true');
                    return true;
                }

            });
            return false;

        }

      else {

        return true;
      }

         }

这是服务器端的python:

@app.route("/user_name", methods=["GET"])
def login_usercheck():
    print(Fore.GREEN + "user_check function, line 171")
    username = (request.args.get('login_username'),)
    print(username)
    conn = sqlite3.connect('database.db')
    c = conn.cursor()
    c.execute("SELECT username FROM users WHERE username =?", username)
    old_user = c.fetchall()

    if len(old_user) > 0:
        return jsonify(True)

    else:
        return jsonify(False)

问题是我在python函数中的用户名变量始终返回NULL。我尝试了(request.form.get,request.args.get ...等的所有组合)有趣的是,我有一个类似的功能来检查注册凭证,并且它工作得很好。我似乎无法弄清楚问题出在哪里...这是我在终端机中得到的:

(无,)192.168.164.98--[05 / Nov / 2019 17:54:01]“ GET / user_name?username = cf HTTP / 1.0” 200-

1 个答案:

答案 0 :(得分:1)

可能是拼写错误?
在您的Javascript中,您可以:

$.get('/user_name?username=' + username, function(r){

在Python中,您可以:

username = (request.args.get('login_username'),)

尝试request.args.get('username')