我有3个.php文件，它们是index.php、load_file.php和register.php
- 在index.php中，包含导航，每个导航都有下拉列表，我称这个导航和数据库中的下拉列表。index.php也有到register.php的链接，注意：load_file.php包含在这个文件中
- 在load_file.php中，包含通过使用if（$_GET['page']）检查页面值的代码，并使用开关情况触发每个值
- register.php，只是一个普通形式
我的问题是，在我通过键入？page=在浏览器中注册，我在index.php文件中的下拉列表变得不可用
：更新：：
这是我的index.php文件
<?php
session_start();
require_once './model/functions.php';
if(isset($_GET["category"])){
$index_page= $_GET["category"];
$index_sub_page= null;
}elseif (isset ($_GET["sub_category"])) {
$index_sub_page = $_GET["sub_category"];
$index_page= null;
}else{
$index_sub_page= null;
$index_page= null;
}
if($_POST){
$username = $_POST["username"];
$password = $_POST["password"];
if(check_username_and_password_from_users($username, $password)){
$_SESSION["username"] = $username;
}
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>Learn Bootstrap</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
</head>
<body>
<div id="TopContainer" class="container">
<div class="pull-right navbar-default">
<ul class="nav navbar-nav">
<?php if(isset($_SESSION["username"])){ ?>
<li class="dropdown">
<a class="dropdown-toggle" href="#" data-toggle="dropdown"><?php echo $_SESSION["username"]; ?></a>
<div class="dropdown-menu" style="padding: 17px;">
<a href="logout.php">Logout</a>
</div>
</li>
<?php }else{ ?>
<!--dropdown here -->
<li class="dropdown">
<a class="dropdown-toggle" href="#" data-toggle="dropdown" id="login">Dropdown</a>
<div class="dropdown-menu" style="padding:17px;">
<form id="loginform" method="post" action="index.php" class="form">
<div class="form-group">
<input class="form-control" type="text" name="username" id="username" placeholder="username">
</div>
<div class="form-group">
<input class="form-control" type="password" name="password" id="password" placeholder="password">
</div>
<input type="submit" value="Submit">
</form>
</div>
</li>
<li><a href="?page=register">Register</a></li>
<?php } ?>
<li><a href="#">FAQs</a></li>
<li><a href="#">Twitter</a></li>
<li><a href="#">Facebook</a></li>
</ul>
</div>
</div>
<div id="logo" class="container">
<div class="col-md-6">
<a class="navbar no-margin" href="#"><img src="picture/LogoSaya.png"></a>
</div>
<div class="col-md-6">
<div class="col-md-6 pull-right">
<div class="input-group input-group-sm">
<span class="input-group-btn">
<button class="btn btn-default" type="button">Go!</button>
</span>
<input type="text" class="form-control" placeholder="Search for...">
</div>
</div>
</div>
</div>
<nav class="container">
<div class="navbar navbar-default">
<ul class="nav navbar-nav">
<?php
$subject_set = find_all_subjects();
while($subject = mysqli_fetch_assoc($subject_set)){
?>
<li>
<a id="dLabel" data-target="#" href="?subject=<?php echo urlencode($subject["id"]);?>" data-toggle="dropdown" aria-haspopup="true" role="button">
<?php echo $subject["name"];?>
<span class="caret"></span>
</a>
<!--dropdown here -->
<ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
<?php
$page_set = find_pages_from_subjects($subject["id"]);
while($page = mysqli_fetch_assoc($page_set)){
?>
<li>
<a href="?category=<?php echo urlencode($page["id"]);?>"><?php echo $page["name"];?></a>
<ul>
<?php
$sub_page_set = find_sub_pages_from_pages($page["id"]);
while($sub_page = mysqli_fetch_assoc($sub_page_set)){
?>
<li>
<a href="?sub_category=<?php echo urlencode($sub_page["id"]);?>"><?php echo $sub_page["name"];?></a>
</li>
<?php
}
clear_result($sub_page_set);
?>
</ul>
</li>
<?php
}
clear_result($page_set);
?>
</ul>
</li>
<?php
}
clear_result($subject_set);
?>
</ul>
</div>
</nav>
<div class="container">
<?php
include "load_files.php"; //this is to load the files
?>
</div>
<script src="//code.jquery.com/jquery-1.11.2.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
</body>
</html>要浏览register.html，我使用以下代码
<li><a href="?page=register">Register</a></li>
正如你所看到的，我把代码放在index.php中
<?php
include "load_files.php"; //this is to load file
?>
这是我的load_files.php
<?php
if($_GET){
switch ($_GET['page']) {
case 'register':
if(!file_exists("register.html")){
die("Sorry Empty Page");
}
include 'register.html';
break;
default:
break;
}
}
?>看起来像是一个事件处理程序问题。我会看看你是如何添加事件处理程序的，看看处理程序是否以某种方式被删除了。
：已解决：
我的问题是，在我通过键入？page=在浏览器中注册，我在index.php文件中的下拉列表变得不可用
这个问题的发生是因为，我有2个
<script src="jquery.js"></script>，在index.php和register.html中。通过删除register.html中的一个将解决