Voici comment récupérer des données au format JSON en PHP avec JQUery.
JSON (JavaScript Object Notation) est un format de données textuel, générique, dérivé de la notation des objets du langage ECMAScript. Il permet de représenter de l’information structurée. Créé par Douglas Crockford, il est décrit par la RFC 4627 de l’IETF.
Un document JSON ne comprend que deux éléments structurels :
des ensembles de paires nom / valeur ;
des listes ordonnées de valeurs.
Ces mêmes éléments représentent 3 types de données :
des objets ;
des tableaux ;
des valeurs génériques de type tableau, objet, booléen, nombre, chaîne ou null.
Code côté PHP json.php
< ?php
header('Cache-Control: no-cache, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Content-type: application/json');
$data[1]['id'] = "1";
$data[1]['value'] = "value1";
$data[2]['id'] = "2";
$data[2]['value'] = "value2";
echo json_encode($data);
?>
Page HTML appelant avec JQuery
$.ajax({
url: "json.php",
contentType: "application/json; charset=utf-8",
dataType: 'json',
success: onLoadData
});
function onLoadData(data) {
alert("I load data");
};
JSONP pour JSON with padding (en français, « JSON avec formatage ») est une extension dans laquelle le nom de la fonction de retour est indiqué. L’idée originale proviendrait du blog MacPython en 2005 et est maintenant répandu dans les applications Web 2.0, telle que Google’s toolkit Applications. Des améliorations sont prévues pour y ajouter des arguments.
JSONP utilise des balises de scripts, les appels sont ouverts. Ainsi, JSONP peut être inapproprié pour transporter des informations confidentielles.
Code côté PHP jsonp.php
< ?php
header('Cache-Control: no-cache, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Content-type: application/json');
$data[1]['id'] = "1";
$data[1]['value'] = "value1";
$data[2]['id'] = "2";
$data[2]['value'] = "value2";
echo $_GET['callback'] . '('.json_encode($data).')';
?>
$.ajax({
url: "jsonp.php",
contentType: "application/json; charset=utf-8",
dataType: 'jsonp',
success: onLoadData
});
function onLoadData(data) {
alert("I load data");
};
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