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
Clic pe tag-ul HTML care afiseaza o linie orizontala.
<br> <em> <hr>Continut ...
<hr />
Alt continut sub linie ...
Care proprietate CSS defineste culoarea textului?
font-style font-variant colorh2 {
color: #cbdafb;
}
Clic pe functia care cauta daca un anume caracter sau text e intr-un sir.
indexOf() toString() split()var str = "Web courses - http://CoursesWeb.net/";
if(str.indexOf("http://") == -1) alert("http:// nu e in sir");
else alert("http:// e in sir");
Care e functia ce imparte un sir in parti de siruri intr-un array, pe baza unui separator?
array_merge() explode() implode()$str = "mar,banana,pepene,para";
$arr = explode(",", $str);
var_export($arr); // array (0=>"mar", 1=>"banana", 2=>"pepene", 3=>"para")
Indicati asocierea corecta: "luna-anotimp".
April - Autumn October - Spring July - SummerJuly is a beautiful summer month.
- Iulie este o frumoasa luna de vara.
Indicati asocierea corecta: "luna-anotimp".
Octubre - Primavera Julio - Verano Abril - OtoƱoJulio es un hermoso mes de verano.
- Iulie este o frumoasa luna de vara.