Count wordpress post hits - wordpress

Question

I want to count and show WordPress posts in admin panel.I don't want to show it on the website but I want to be able to sort posts in admin panel according to their hits.
I used this link to do so. Every thing is good but it only doesn't sort the posts. In the source website it has told to put some code in template.js. But I don't know where is this file.
functions.php
/*
Function: getPostViews (custom)
Gets the Post Views count
Returns:
$count.' Views'
*/
function getPostViews($postID){
$count_key = 'post_views_count';
$count = get_post_meta($postID, $count_key, true);
if($count==''){
delete_post_meta($postID, $count_key);
add_post_meta($postID, $count_key, '0');
return "0 View";
}
return $count.' Views';
}
/*
Function: setPostViews (custom)
Sets the Post Views count
*/
function setPostViews($postID) {
$count_key = 'post_views_count';
$count = get_post_meta($postID, $count_key, true);
if($count==''){
$count = 0;
delete_post_meta($postID, $count_key);
add_post_meta($postID, $count_key, '0');
}else{
$count++;
update_post_meta($postID, $count_key, $count);
}
}
template.js
// get querystring as an array split on "&"
var querystring = location.search.replace( '?', '' ).split( '&' );
// declare object
var queryObj = {};
// loop through each name-value pair and populate object
for ( var i=0; i<querystring.length; i++ ) {
// get name and value
var name = querystring[i].split('=')[0];
var value = querystring[i].split('=')[1];
// populate object
queryObj[name] = value;
}
// Check query string for sort filter method
if(queryObj[ "filter" ] === "popular"){
$('#newest').removeClass('active');
$('#popular').addClass('active');
} else if(queryObj[ "filter" ] === "newest"){
$('#popular').removeClass('active');
$('#newest').addClass('active');
}
Wordpress Post Sorting
<?
// Place this code into your archive.php template file
$filter = $_GET['filter'];
// Preserve existing query parameters
global $wp_query;
// Check query string parameter "filter" (options: 'popular' and 'newest')
if((isset($filter)) && $filter == 'popular'){
$args = array_merge( $wp_query->query, array('order' => 'desc', 'orderby' => 'meta_value_num', 'meta_key' => 'post_views_count') );
query_posts( $args );
}else if((isset($filter)) && $filter == 'newest'){
$args = array_merge( $wp_query->query, array('order' => 'desc') );
query_posts( $args );
}
?>