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
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.
Preluare sir JSON in PHP de la JavaScript

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