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
Ce atribut poate fi utilizat pentru a adauga stiluri CSS direct in tag-ul HTML?
type style class
<div style="width: 80%; border: 3px solid #888888;">Continut</div>
Care din metodele proprietatii CSS transform distorsioneaza elementul HTML la un anumit unghi (inclusiv continutul lui)?
translate() scale() skew()
#un_id {
  transform: skew(20deg, 25deg);
  -ms-transform: skew(20deg, 25deg);   /* IE 9 */
  -webkit-transform: skew(20deg, 25deg);   /* Safari and Chrome */
}
Clic pe functia care poate converti un obiect Date in Sir.
indexOf() toString() getDate()
var rightnow = new Date();
alert( rightnow.toString() );
Care functie aplica o alta functie la elementele unui array?
array_merge() array_search() array_map()
$arr = arra("abc", "<p>xyz</p>", "<em>PHP</em>");
// aplica functia strip_tags() ca sa stearga tag-urile HTML din fiecare element din %arr
$arr = array_map("strip_tags", $arr);
}
Cum se spune "sambata" in limba engleza?
Sunday Saturday Monday
On Saturday I visit my grandparents.
- Sambata imi vizitez bunicii.
Cum se spune "sambata" in limba spaniola?
domingo lunes sábado
Sábado visito mis abuelos.
- Sambata imi vizitez bunicii.
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