Get records in auto suggestion search box - php

Question

I want to get all the records in autocomplete search box.
And as well get complete record from database of selected keyword from autocomplete list.
Output here
http://appail.xyz/ajax-box-php-master/
How can i get complete record by selecting the keyword??
Thank in Advance...
Here is added my PHP, HTML Code.
PHP Code
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap-theme.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script src="typeahead.min.js"></script>
<script>
$(document).ready(function(){
$('input.typeahead').typeahead({
name: 'typeahead',
remote:'search.php?key=%QUERY',
limit : 10
});
});
</script>
.bs-example{
font-family: sans-serif;
position: relative;
margin: 50px;
}
.typeahead, .tt-query, .tt-hint {
border: 2px solid #CCCCCC;
border-radius: 8px;
font-size: 24px;
height: 30px;
line-height: 30px;
outline: medium none;
padding: 8px 12px;
width: 396px;
}
.typeahead {
background-color: #FFFFFF;
}
.typeahead:focus {
border: 2px solid #0097CF;
}
.tt-query {
box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset;
}
.tt-hint {
color: #999999;
}
.tt-dropdown-menu {
background-color: #FFFFFF;
border: 1px solid rgba(0, 0, 0, 0.2);
border-radius: 8px;
box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
margin-top: 12px;
padding: 8px 0;
width: 422px;
}
.tt-suggestion {
font-size: 24px;
line-height: 24px;
padding: 3px 20px;
}
.tt-suggestion.tt-is-under-cursor {
background-color: #0097CF;
color: #FFFFFF;
}
.tt-suggestion p {
margin: 0;
}
<div class="panel panel-default">
<div class="bs-example">
<input type="text" name="typeahead" class="typeahead tt-query" autocomplete="off" spellcheck="false" placeholder="Type your Query">
</div>
</div>
<?php
$key=$_GET['key'];
$array = array();
$con=mysqli_connect("localhost","appail_register","appail_register","appail_register");
$query=mysqli_query($con, "select * from login where username LIKE '%{$key}%'");
while($row=mysqli_fetch_assoc($query)){
$array[] = $row['username'];}
echo json_encode($array);
mysqli_close($con);
?>