How to implement Heatmap on Websites using PHP, MySQL, jQuery and Ajax?

I was assigned a task when an Interviewer interviewed me and that was a Technical question. I was asked to design a system that can gather click data from a webpage and show it later in form of a Heatmap.

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This system can be integrated into any website which records visitor clicks on the page. The goal of of this will be to track visitor’s mouse clicks on various elements of the page and later show them accurately in form a Heatmap. The owner should be able to see aggregated click data in form of an overlay on top of his webpage. The areas in the heatmap that are red more clicks compared to the areas that are white.

After googling through the internet I found some resources which were very interesting. I devoted some time and tried to implement a demo. Please follow the following Steps:

1. Client Code : Create a file index.php and include the following code below. This is the page where users make clicks.

[code]
<script type=’text/javascript’ src="js/jquery-lib.js"></script> <!– jQuery library –>
<script type=’text/javascript’ src="js/hm-dev.js"></script> <!– Log JS –>

<title>99-Websites.com Labs</title>
<body>
<div style="text-align:center">
<img src="99-ws-labs.jpg" />
</div>
</body>

[/code]

2. The Ajax Call : Create a JS file named as hm-dev.js. This file is included in the above index.php page. Add the snippet below:

[code]
/*
Author : Dev
Date : 12/06/2015
*/

jQuery(document).ready(function() {
jQuery(document).click(function(e){
//alert(window.location.href.toString().split(window.location.host)[1]+" — "+e.pageX+" — "+e.pageY);
log_click(window.location.href.toString(), e.pageX, e.pageY);
});
var canvas = document.getElementsByTagName(‘canvas’)[0];
canvas.style.display = "none";
});

function log_click(page, x, y){ // log clicks for heatmap
jQuery.ajax({
type: ‘POST’,
url: ‘log_click.php’,
crossDomain: true,
data: "x_coord="+x+"&y_coord="+y+"&page="+page,
dataType: ‘json’,
success: function(responseData, textStatus, jqXHR)
{
if (responseData== 1){
console.log("Click logged: " + x + ", " + y);

}
else{
console.log("Error – click not logged " + x + ", " + y);
}
},
error: function (responseData, textStatus, errorThrown)
{
console.warn(responseData, textStatus, errorThrown);
alert(‘CORS failed – ‘ + textStatus);
}
});
}
[/code]

3. Log the Clicks : Create a PHP file named with log_click.php and add the following snippet.

[code]

<?php
header(‘Access-Control-Allow-Origin: *’);
header(‘Access-Control-Allow-Methods: POST, GET, OPTIONS’);
header(‘Access-Control-Max-Age: 1000’);
header(‘Access-Control-Allow-Headers: Content-Type’);

//echo json_encode(array("your_request_was" => $_POST[‘page’].$_POST[‘x_coord’].$_POST[‘y_coord’]));

include(‘config.php’); //Create config.php file and define $dbuser, $dbpass & $dbname

if(isset($_POST[‘x_coord’])){
$page = htmlentities($_POST[‘page’]);
if($page == "/"){ $page = "/index.php"; }
$xcoord = htmlentities($_POST[‘x_coord’]);
$ycoord = htmlentities($_POST[‘y_coord’]);
$time = date( ‘Y-m-d H:i:s’);

$conn = mysql_connect(‘localhost’, $dbuser, $dbpass);
mysql_select_db($dbname, $conn);
$page = mysql_real_escape_string($page);
$xcoord = mysql_real_escape_string($xcoord);
$ycoord = mysql_real_escape_string($ycoord);

mysql_query("INSERT INTO clicks (timestamp, page, x, y) VALUES (‘$time’, ‘$page’, $xcoord, $ycoord)");
mysql_close($conn);
echo "1";
}
else
{
echo ‘0’;
}

?>

[/code]

4. Create MySQL Table : Create table with following fields:

[code]

CREATE TABLE IF NOT EXISTS `clicks` (
`timestamp` datetime NOT NULL,
`page` varchar(200) NOT NULL,
`x` int(255) NOT NULL,
`y` int(255) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

[/code]

That’s it, the first part is over. After implementing the above steps you will be able to log clicks on the MySQL Table. The next and the main part is viewing the heat maps.

5. Create the Admin Page : Create PHP page named with admin.php. This page will lists out all the domains on which the client side code is added. When the links are clicked, their respective heatmaps will be displayed below the same page.  Admin Code is listed below:

[code]

<?php
/*
Author : Dev
Date : 12/06/2015
*/
include("config.php");
$con2 = mysql_connect(‘localhost’, $dbuser, $dbpass);
mysql_select_db($dbname, $con2);
$query = "SELECT distinct page FROM `clicks` WHERE 1";
$result = mysql_query($query);
?>
<html>
<head>
<title>Heatmap Admin</title>
<script type=’text/javascript’ src="js/jquery-lib.js"></script>

<script type=’text/javascript’ src="js/heatmap.js"></script>
<script>
jQuery(document).ready(function(){
var heatmapInstance = h337.create({
container: document.querySelector(‘.display’),
radius: 25
});

jQuery(".showcanvas").click(function(){
//location.reload();
//alert(jQuery(this).attr(‘value’));
var timescale = "day";
var page = jQuery(this).attr(‘value’);
//alert(page);
var postData = "timescale="+timescale+"&page="+page;
jQuery.ajax({
type:"POST",
dataType: "json",
data: postData,
beforeSend: function(x) {
if(x && x.overrideMimeType) {
x.overrideMimeType("application/json;charset=UTF-8");
}
}, url: ‘heatmap.php’,
success: function(data) {

if (data.amount > 0){
for (i=0; i<data.amount; i++){
heatmapInstance.addData({
x: data[i].x,
y: data[i].y,
value: 2
});
}
}
}
});

});
});
</script>
</head>
<body >
<div style="width:100%; border:1px solid; black;">
[Click on the Websites below to View their respective HeatMaps]<br>
<ul style="font-size:12px;">
<?php
while($row = mysql_fetch_assoc($result)){
?>
<li><a href="#" class="showcanvas" value="<?=$row["page"]?>"> <?=$row["page"]?></a></li> <br/>

<?php

}
?>
</ul>
</div>
<div class="display" style="width:100%;height:100%;border:1px solid; black;float:right;">
</div>

</body>
</html>

[/code]

The main logic behind the code is the heatmap.js library. In order to understand in detail you can explore the following references:

1. http://www.patrick-wied.at/static/heatmapjs/example-click-heatmap.html

2. http://rossmarks.co.uk/blog/?p=683

3. http://www.d-mueller.de/blog/cross-domain-ajax-guide/

You can view the Demo here: 

1. Client / Users Page : http://99labs.net where you can make some clicks on the webpage.

2. Admin Page : http://dewendra.com.np/labs/hm/admin.php where you can view the Heatmap.

Also, You can download the whole code from here : Download

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PS : The client code can be installed into any website and their logs can be maintained on the remote server. If you go through the client side code you can see the ajax code implemented with CORS (Cross Origing Resource Sharing) using jQuery.

Check whether current time lies between start hour and end hour (PHP)

I started to think of a function in PHP that checks the current time whether it lies between start hour and end hour. This was a task from my boss a couple of weeks ago. He asked this function to write in order to turn down our web application from 900PM to 400AM and display an appropriate message. I googled for a few minutes and compiled the code below:

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[code]
function checkTime($current_time, $start, $end){
/* $current_time = "9:00 pm";
$start = "9:00 pm";
$end = "4:00 am"; */

$date1 = DateTime::createFromFormat(‘H:i a’, $current_time);
$date2 = DateTime::createFromFormat(‘H:i a’, $start);
$date3 = DateTime::createFromFormat(‘H:i a’, $end);

//echo $date1;
if ($date1 &gt;= $date2 || $date1 &lt; $date3)
{
return 1;
}
else{
return 0;
}
}

$curTime = date(‘h:i a’);
$curTime = "9:00 pm";
//echo $curTime;
if(checkTime($curTime, "9:00 pm", "4:00 am")==1){
echo "Server Under Maintenance !!
<div style="color: #cc503f; border: 2px solid red; border-radius: 6px; margin-left: auto; margin-right: auto; width: 600px; height: 200px; padding: 10px; text-align: center;">
<h2>Notice!!!</h2>
<h3>Portal under Maintenance from 9PM to 4AM. Please visit back soon.</h3>
</div>
";
exit;
}
[/code]

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Eport data to excel using Codeigniter and Oracle (OCI)

Below is a simple code snippet that will help you to export data to CSV/Excel format using Codeigniter and Oracle. Yes, it is obvious that you must have knowledge regarding Codeigniter and Oracle before you proceed further reading.

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The code below contains few PHP variables and function calls. I hope that you understand the same in a better way and please give your feedback if you feel this needs.

$sql = "SELECT * FROM your_table_name";
$filename = "Name_of_the_file.csv";
$countRow = functionCountRow();

$this->searchkyc_model->ExportToExcel($sql,$filename,$countRow);

public function ExportToExcel($sql,$filename,$countRow) { 	

		$output = "";

		$this->epfo_db = $this->load->database('EPFO', true);		

		$stmt = oci_parse($this->epfo_db->conn_id, $sql);

		oci_execute($stmt);

		$ncols = oci_num_fields($stmt);

		for ($i = 1; $i <= $ncols; ++$i) { 			
                    $colname = oci_field_name($stmt, $i);			 			
                    $output .= '"'.$colname.'",'; 		
                 } 		
                $output.="n"; 		 		
                $row = oci_fetch_all($stmt, $result); 		
                oci_free_statement($stmt); 		
                oci_close($this->epfo_db->conn_id);	

		// Get Records from the table
		for($i=0;$i<$countRow;$i++){ 				 				                
                    foreach($result as $key=>$val){
					$output.='"'.$val[$i].'",';
		          }
				$output.="n";
		}

		// Download the file	
		header('Content-type: application/csv');
		header('Content-Disposition: attachment; filename='.$filename);

		echo $output;
		exit;

	 }

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ORA-24408: could not generate unique server group name

After continuous google for more than 10 hours, I finally came to a conclusion that the problem “ORA-24408: could not generate unique server group name” was not with oracle instanclient or the connection string oci_connect(). The only problem was with the mis-match of the hostnames of the application server defined in /etc/sysconfig/network & /etc/hosts.

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After modifying the hostnames in both the file to a single name, the problem was solved.

 $ vi /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=RHEL65
$vi /etc/hosts

$ vi /etc/hosts
#127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
127.0.0.1    RHEL65

$service network restart

The above steps helped me save my valuable time. Thanks to the bloggers.

I hope these information would help you too. Best wishes!

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[Source: http://ahmadzainuddinzakaria.blogspot.in/2012/06/warning-ociconnect-functionoci-connect.html]

Unable to save changes to menu in Drupal 6

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On the menu-customize page, after

1) dragging a menu item, or

2) checking/unchecking an enable checkbox,

and clicking “Save configuration”, changes to menu were not saved in Drupal 6. Hence, I started to debug the issue at the Application level. After long head bang, I raised my hand and took some rest. Finally, I googled and found that the problem was not at the Application Level but at System Level. I came to know that while posting the form (i.e. when Save Configuration is clicked) the data sent was of large amount and the system was not able to accept since maximum input size was not defined. Following were the changes made in php.ini file.

; How many GET/POST/COOKIE input variables may be accepted
max_input_vars = 2048

After making above changes I restarted the Apache server. Thus, the problem was resolved and Save Configuration in Menu started working.

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