The application subfolders contain only the files needed to produce an example. You need a functioning CI setup to run this example.
The folder structure inside application/ matches the standard CodeIgniter (CI) installation.
Copy the files to the matching folders of your CI setup.
Because this example uses a "hook" be sure to set $config['enable_hooks'] = TRUE; in your config.php file.
Once the files are in place browse to http://yoursite.com/user and give the example app a try.
The view loaded by User.php contains three buttons. Each button makes an ajax request to User_ajax in a slightly different way.
The intent is to show how to respond appropriately to various ajax.dataType option values.
The bottom button demonstrates how to use getInputs() to verify that required fields have been posted.
The JavaScript that handles button clicks (and triggers ajax requests) is in the view file ajax_test_v.php.
There are a couple of commented lines in the JavaScript that, when uncommented, will change the outcomes for a couple buttons. Try out these variations - hopefully they are instructive.
To see what happens when an attempt is made to access User_ajax directly point a browser to
http://yoursite.com/user_ajax/get_json and enjoy the "404 Page Not Found" screen that appears.
Use this example to experiment according to your needs.
One thing this example does not do is call ajax_error() explicitly. You might want to think up a case where you would
want to do that and try it out.
For instance:
if(FALSE === $isAuthorized)
{
$this->ajax_error('You must Sign In to continue!', 401);
}
// authorized user - continue with your code here
Keep in mind that a call to $this->ajax_error(); will end script execution after the error response
is sent. This means you do not need an else block to handle the case where $isAuthorized is TRUE.