DecSoft Support - 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.

Purchase one or more licenses of our products if they are useful to you!

Mark Stow

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

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