I am working on a site. i have a navbar which is dynamic. i want to display the data on same page when user click on link. i am using $_REQUEST. Code is working fine but when i run the script it gives an error that 'undefined index val'... but when user click on a link it works fine. i want to remove that error.please guide me
<html>
<head>
<style>
body {
background: #212121;
font-size:22px;
line-height: 32px;
color: #ffffff;
word-wrap:break-word !important;
font-family: 'Quicksand', sans-serif;
margin: 0;
padding: 0;
}
h1 {
font-size: 60px;
text-align: center;
color: #FFF;
margin-top: 150px;
font-family: 'Russo One', sans-serif;
}
h1 span {
color: #FF4649;
}
#container {
margin: 0 auto;
}
nav {
margin: 35px 0;
background-color: #FF4649;
}
nav ul {
padding: 0;
margin: 0;
list-style: none;
position: relative;
}
nav ul li {
display:inline-block;
background-color: #FF4649;
}
nav a {
display:block;
padding:0 10px;
color:#FFF;
font-size:20px;
line-height: 60px;
text-decoration:none;
}
nav a:hover {
background-color: #333;
}
nav ul ul {
display: none;
position: absolute;
top: 60px;
}
nav ul li:hover > ul {
display:inherit;
}
nav ul ul li {
width:230px;
float:none;
display:list-item;
position: relative;
}
nav ul ul ul li {
position: relative;
top:-60px;
left:230px;
}
nav ul ul li {
border: 1px solid white;
}
//li > a:after { content: ' ▼'; }
//li > a:only-child:after { content: ''; }
</style>
</head>
<body>
<html>
<head>
<meta charset="UTF-8">
<title>Pure CSS DropDown Menu</title>
<link href="https://fonts.googleapis.com/css?family=Quicksand|Russo+One&display=swap" rel="stylesheet">
<link rel="stylesheet" href="style.css">
</head>
<body>
<?php
$con=mysqli_connect("localhost","root","","links");
if(!$con){
echo "error occured";
}
$query="SELECT * FROM cat";
$result=mysqli_query($con,$query);
?>
<div id="container">
<nav>
<ul>
<?php
while($row=mysqli_fetch_array($result)){
$fn_id=$row['id'];
$sub_query="SELECT * FROM subcat WHERE catid=".$fn_id;
$sub_result=mysqli_query($con,$sub_query);
?>
<li><a href="pagination1.php?val=<?php echo $row['id']; ?>"><?php echo $row['name'];?></a>
<ul>
<?php
while($sub_row=mysqli_fetch_array($sub_result)){
?>
<li><a href="pagination1.php?val=<?php echo $sub_row['id']?>"> <?php echo $sub_row['anme'];?></a></li>
<?php
}
?>
</ul>
<?php
}
?>
</li>
</ul>
</nav>
<h1>Simple <span>CSS</span> DropDown Menu</h1>
</div>
<?php
$query='SELECT * FROM data WHERE subcat='.$_REQUEST['val'];
$result=mysqli_query($con,$query);
while($row=mysqli_fetch_array($result)){
?>
<p><?php echo $row['Name'];?></p>
<?php
}
?>
</body>
</html>
</body>
</html>
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