Curs Ajax

Acest tutorial explica cu exemple de cod cum se poate prelua in PHP un sir JSON transmis cu Ajax din JavaScript.
Se poate folosi unul din urmatoarele doua variante:

Folosind php://input stream

- Documentatie despre PHP I/O streams
In acest caz obiectul JSON e trimis ca sir la php prin ajax cu Content-type application/json.
- Exemplu.
In JavaScript:
<script>
var data ={s1:'marplo.net', s2:'gamv.eu', y:2020};

//jsn_str = json string
function ajaxF(jsn_str) {
 var request = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP'); // XMLHttpRequest object

 request.open('POST', 'test.php', true); // set the request

 //sends data as json
 request.setRequestHeader('Content-type', 'application/json');
 request.send(jsn_str);

 // Check request status
 // If the response is received completely, alert response
 request.onreadystatechange =()=>{
 if(request.readyState ==4){
 alert(request.responseText); // marplo.net
 }
 }
}

//converts data object in json string and sends it to php
let jsn = JSON.stringify(data);
ajaxF(jsn);
</script>
In PHP (test.php):
$arr = json_decode(file_get_contents('php://input'), true);
echo $arr['s1'];
exit;

Adaugare sir JSON in variabila $_POST

In acest caz sirul JSON e atasat la un nume (aici "jsn"), si trimis prin ajax cu POST si Content-type application/x-www-form-urlencoded.
- Exemplu.
In JavaScript:
<script>
var data ={s1:'marplo.net', s2:'gamv.eu', y:2020};

//jsn_str = json string
function ajaxF(jsn_str) {
 var request = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP'); // XMLHttpRequest object

 request.open('POST', 'test.php', true); // set the request

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

 // Check request status
 // If the response is received completely, alert response
 request.onreadystatechange =()=>{
 if(request.readyState ==4){
 alert(request.responseText); // gamv.eu
 }
 }
}

//converts data object in json string and sends it to php
let jsn = JSON.stringify(data);
ajaxF(jsn);
</script>
In PHP (test.php):
$arr = isset($_POST['jsn']) ? json_decode($_POST['jsn'], true) :['s2'=>'default'];
echo $arr['s2'];
exit;

Un Test simplu in fiecare zi

HTML
CSS
JavaScript
PHP-MySQL
Engleza
Spaniola
Ce tag HTML5 este indicat sa contina meniul cu link-uri de navigare in site?
<section> <nav> <article>
<nav><ul>
 <li><a href="http://coursesweb.net/css/" title="CSS Course">CSS Course</a></li>
 <li><a href="http://www.marplo.net/jocuri/" title="Flash Games">Flash Games</a></li>
</ul></nav>
Ce proprietate CSS muta elementrul in dreapta sau stanga de la locul unde e?
text-align clear float
.some_class {
  width: 30%;
  float: left;
}
Clic pe metoda obiectului Math care rotunjeste numarul x descrescator la cel mai apropiat intreg.
Math.ceil(x) Math.abs(x) Math.floor(x)
var num = 12.34567;
num = Math.floor(num);
alert(num);       // 12
Indicati functia PHP care returneaza numarul de caractere dintr-un sir.
mb_strlen() count() stristr()
$str = "sir cu caractere utf-8 åèö";
$nrchr = mb_strlen($str);
echo $nrchr;        // 29
Clic pe raspunsul potrivit la intrebarea: "When it happened?".
On the 7th of July 1996 It is a quarter to 5. Nice weather.
When it happened? On the 8th of August 2001.
- Cand s-a intamplat? Pe 8 August 2001.
Indicati raspunsul potrivit la intrebarea: "¿Cuando sucedió?".
Hace buen tiempo. En el 8 de Agosto de 2001 Son las tres menos cuarto.
¿Cuando sucedió? En el 8 de Agosto de 2001.
- Cand s-a intamplat? Pe 8 August 2001.
Preluare sir JSON in PHP de la JavaScript

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