Pentru a apela o functie Ajax cand pagina e inchisa, aplicati evenimentul beforeunload la obiectul "window", care sa apeleze functia ajax cand evenimentul este emis.
- Cererea ajax trebuie facuta in mod sincron (synchronous).
<script>
// sends data to a php file, via POST, when page is closed
function pageClosed() {
 var request = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP'); // XMLHttpRequest object
 var data ='name=val'; //data with name and value to send to your_script.php
 request.open('post', 'your_script.php', false); //false - to make synchronous request

 request.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
 request.send(data); //sends data

 console.log(data); //for debug to see if code is executed
 return true;
}

//register event emited when page is closed, it calls the pageClosed() function
window.addEventListener('beforeunload', pageClosed);
</script>
- In scriptul php apelat de Ajax se adauga functia ignore_user_abort(true);. Permite rularea scriptului php si dupa ce fereastra browser-ului este inchisa.

Inregistrare timp petrecut de utilizatori pe site

Iata o aplicatie practica a codului dat mai sus.
Urmatorul script inregistreaza intr-un fisier pe server timpul petrecut de utilizatori pe site (in format json). Aici se inregistreaza utilizatorul dupa IP.

1. Adaugati urmatorul script ajax in paginile din site:
<script>
var start_time = Math.floor(Date.now() /1000);

// sends to php the number of seconds the user spend on time
function pageClosed() {
 var request = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP'); // XMLHttpRequest object
 var data ='tms='+(Math.floor(Date.now() /1000) - start_time); //data to send to reg_time.php
 request.open('post', 'reg_time.php', false); //false - to make synchronous request

 request.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
 request.send(data); //sends data

 console.log(data); //for debug to see if code is executed
 return true;
}

//register event emited when page is closed, it calls the pageClosed() function
window.addEventListener('beforeunload', pageClosed);
</script>
2. Adaugati urmatorul cod intr-un fisier php: "reg_time.php".
<?php
ignore_user_abort(true);

if(isset($_POST['tms'])){
 $tms = intval($_POST['tms']);
 $user = $_SERVER['REMOTE_ADDR']; //here we use the ip
 $file ='reg_time.json';
 $f_data =[];

 //add the $user and $tms in json format in $file
 if(!file_exists($file)){
 $f_data[$user] = $tms;
 } else {
 $f_data = json_decode(file_get_contents($file), true);
 if(isset($f_data[$user])) $f_data[$user] = $f_data[$user]+ $tms;
 else $f_data[$user] = $tms;
 }

 file_put_contents($file, json_encode($f_data));
}
3. Urmatorul cod php poate fi utilizat pentru a citi si afisa datele inregistrate in "reg_time.json":
<?php
$file ='reg_time.json';
$f_data =[];

if(file_exists($file)) $f_data = json_decode(file_get_contents($file), true);

foreach($f_data as $k=>$v){
 echo '<br>'. $k.' = '.$v.' seconds';
}

Un Test simplu in fiecare zi

HTML
CSS
JavaScript
PHP-MySQL
Engleza
Spaniola
Care tag defineste zona de click intr-o harta creata dintr-o imagine?
<map> <img> <area>
<img src="image.jpg" usemap="#map1">
<map name="map1">
  <area shape="rect" coords="9, 120, 56, 149" href="#">
  <area shape="rect" coords="100, 200, 156, 249" href="#">
</map>
Ce proprietate CSS indica ce sa se intample cand continutul unui element depaseste dimensiunile lui?
display overflow position
#id {
  overflow: auto;
}
Clic pe evenimentul care este declansat cand mouse-ul e deasupra unui obiect.
onclick onmouseover onmouseout
document.getElementById("id").onmouseover = function(){
  document.write("Sa ai Viata Buna");
}
Indicati variabila PHP ce contine datele adaugate in adresa URL, dupa caracterul "?".
$_SESSION $_GET $_POST
if(isset($_GET["id"])) {
  echo $_GET["id"];
}
Clic pe pronumele reflexiv care e potrivit in propozitia: "Marc is the boy ... won the prize".
who which whoever
Marc is the boy who won the prize.
- Marc e baiatul care a castigat premiul.
Clic pe pronumele reflexiv care e potrivit in propozitia: "Voy a ver al pintor de ... les hablé ayer".
que quien cuyo
Voy a ver al pintor de quien les hablé ayer.
- Ma duc sa vad pictorul despre care ti-am vorbit ieri.
Apelare functie Ajax la inchidere pagina

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