.val（）不起作用-找不到解决方案

Question

$(document).ready(function() {
 var login = $("#login").val();
 var password = $('#password').val();


 $('.login-button').click(function() {
  alert(login);
 });
});

HTML

<form method="post" class="login">  <p id="login-error"></p>
<p>
  <label for="login">Username:</label>
  <input type="text" name="login" id="login" placeholder="username">
</p>

<p>
  <label for="password">Password:</label>
  <input type="password" name="password" id="password" placeholder="password">
</p>

<p class="login-submit">
  <button class="login-button">Login</button>
</p>

<p class="forgot-password">Fill your username and password.</p>   </form>

It shows nothing! What's up with it? Any solution? The id names are correct

EDIT: I have another problem. Dont want to open another question for that. I'm trying to get ajax answer from validate.php (it is in /views/admin/validate.php - it runs when opening domain.com/validate)

$(document).ready(function() {  
$('.login-button').click(function() {
var login = $("#login").val();
var password = $('#password').val();
$.ajax({
  type: 'POST',
  url: '/view/admin/validate.php',
  data: {
  login : login,
  password : password
  },
  success: function(data){
    $('#login-error').html(data);
  }
});
});
});

validate.php

<?php
session_start();
$user = mysql_real_escape_string($_POST['login']);
$password = mysql_real_escape_string(sha1($_POST['password']));
$query = mysql_query("SELECT * FROM  `users` WHERE name =  '$user' AND pass =  '$password' AND privileges = 'superuser'");
$num_rows = mysql_num_rows($query);
if($num_rows == '0') {
echo "Username and Password are incorrect! (Maybe you don't have permission!)";
}
elseif($num_rows == '1') {
$expire = time()*60*60*60*60;
setcookie("user","$user",$expire);
$_SESSION['user'] = $user;
include '/views/admin/admin.php';
}
?>

It should return Username and Password are incorrect! (Maybe you don't have permission!) - but it doesn't.. Any solution??

Answer 1

var login = $("#login").val();

When this line runs, the input is empty.

You need to get the value after the user types something.

Answer 2

$('.login-button').click(function() {
  var login = $('#login').val();
  alert(login);
 });

Answer 3

Try it :

$('.login-button').click(function() {
  alert($("#login").val());
 });

or :

$('.login-button').click(function() {
      var login = $("#login").val();
      alert(login);
     });

or :

var login = "";
$('.login-button').click(function() {
      login = $("#login").val();
      alert(login);
     });