DecSoft Soporte - JSON Data Parsing

JSON Data Parsing

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Mark Stow

Hi David, Do you have any sample of parsing json data from a server? i.e user logs in on app and then the app receives json data containing account information. I have a server up and running and i can get the app the receives the data i just cant work out how to put the data into variables Thanks for you time

DecSoft

Hello Mark,

Yes; don't worry, because, it's quite easy. So once you get working one time... you know what to do in next similar situations. May I can provide a sample app in the near future, however, I think you can got it also if I refer here the steps.

First of all, prepare a server's script, in the below case a PHP one, which returns some JSON object to our app, when it's called:


// Enable CORS (http://enable-cors.org/server_php.html)
header('Access-Control-Allow-Origin: *');

// Access-Control headers are received during OPTIONS requests
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
  if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
    header("Access-Control-Allow-Methods: GET, POST, OPTIONS");
  if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
    header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");
  exit;
}

// This is a sample of data, which can become from a database
// for example. The point is that we can return here an associated
// array, which later "json_encode" convert into the right JSON.

$data = array(
  'firstName' => 'John',
  'lastName' => 'Doe'
);

// Set the appropriate header (we returns a JSON object)

header('Content-Type: application/json');

// And echo the JSON as the response of this script.
echo json_encode($data);

// Exit the script execution here.
exit;

Use an HTTP control, and, set his "Url" property to the URL of the above script, for example: "https://www.mydomain.com/myscript.php".

Then use the "execute()" method of the HTTP control to made the HTTP call. And finally look at the most interesting part: in the Done event of the HTTP control, you can access the JSON object using the HTTP control "response" property:


// Show the name of the user
alert(views.view1.http1.response.firstName);

// Show the last name of the user
alert(views.view1.http1.response.lastName);

So, as you can see, can't be more easy: the HTTP control "response" is the JSON object that the script / server returns, and we can just access that JSON object properties like any other JavaScript property, like you can see above.

Please, take your time and try to prepare a sample app based in the above information: if you need some help at some point, just post it here and we will try to help you. :-)

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DecSoft

Hello Mark,

Just for your information, there is a new sample app named "GetJson" included in the current release of DecSoft App Builder. Please, take a look and don't hesitate to post here if you have any further question.

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Mark Stow

Hi David, Thank you for the reply, that has helped me a lot. Thank you

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