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Best Practice: Controller that handles multiple access methods (url/uri, ajax, post) - El Forum - 09-08-2009

[eluser]Unknown[/eluser]
I am curious how others are coding controller functions that do one thing, but can be accessed through multiple methods. For the sake of example, imagine a controller for administrating categories.

1. You want to be able to delete categories via a hyperlink that is captured by javascript and handled by an ajax request, with a JSON response.
2. In the interest of being degradable, you want the hyperlink (something like "/admin/categories/delete/27") to be functional, in case javascript is turned off.
3. Elsewhere in the admin, you have a page that allows you to delete multiple categories or some other method that involves posting the category_id.

The most obvious three techniques I can think of are included below, but they all seem a bit clunky. How are you handing these types of situations in your controller code?

(These are all coded quickly for this post and not actually used, just a general idea...)

Possible Technique 1: One Function

Code:
function delete() {
    if(intval($this->uri->segment(4))) {
        $category_id = (int) $this->uri->segment(4);
        $this->category_model->delete($category_id);
        $this->load->view("admin/categories/delete_succes");
    } else {
        $category_id = (int) $this->input->post('category_id');
        $this->category_model->delete($category_id);
        if($this->user_agent->is_ajax()) {
            $json = array(
                "result" => "success",
                "message" => "The category was successfully deleted."
            );
            $this->load->view("json", $json);
        } else {
            $this->load->view("admin/categories/delete_succes");
        }
    }
}

Possible Technique 2: Separate functions

Code:
function ajax_delete() {
    $category_id = (int) $this->input->post('category_id');
    $this->category_model->delete($category_id);
    $json = array(
        "result" => "success",
        "message" => "The category was successfully deleted."
    );
    $this->load->view("json", $json);
}

function delete() {
    $category_id = (int) $this->uri->segment(4);
    $this->category_model->delete($category_id);
    $this->load->view("admin/categories/delete_succes");
}

function post_delete() {
    $category_id = (int) $this->input->post('category_id');
    $this->category_model->delete($category_id);
    $this->load->view("admin/categories/delete_succes");
}

Possible Technique 3: Utility Functions

Code:
function delete() {
    if(intval($this->uri->segment(4))) {
        $this->_process_delete($this->uri->segment(4));
    } else {
        $category_id = (int) $this->input->post('category_id');
        if($this->user_agent->is_ajax()) {
            $this->_process_ajax_delete($category_id);
        } else {
            $this->_process_delete($category_id);
        }
    }
}

Thanks in advance.


Best Practice: Controller that handles multiple access methods (url/uri, ajax, post) - El Forum - 09-08-2009

[eluser]GSV Sleeper Service[/eluser]
IMO it's a bad idea to use 'GET' for deletion, imagine if somehow your secure area became unsecure, googlebot would quite happily spider your admin area deleting all your content as it goes!


Best Practice: Controller that handles multiple access methods (url/uri, ajax, post) - El Forum - 09-08-2009

[eluser]Johan André[/eluser]
I would go for the first approach. It's very slick!

I usually define a constant in application/config/constants.php:

Code:
define('IS_AJAX', isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');

Then in my controllers (or views):

Code:
if(IS_AJAX)
{
   // Do the ajax magic thing
} else {
   // Do the standard stuff (non-ajax)
}

I guess you extended the useragent-lib since there is no is_ajax()-method built-in?


Best Practice: Controller that handles multiple access methods (url/uri, ajax, post) - El Forum - 02-17-2010

[eluser]jcavard[/eluser]
Thank Johan André! It's so simple yet brilliant! neat thanks!

[quote author="Johan André" date="1252421870"]I would go for the first approach. It's very slick!

I usually define a constant in application/config/constants.php:

Code:
define('IS_AJAX', isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');

Then in my controllers (or views):

Code:
if(IS_AJAX)
{
   // Do the ajax magic thing
} else {
   // Do the standard stuff (non-ajax)
}

I guess you extended the useragent-lib since there is no is_ajax()-method built-in?[/quote]


Best Practice: Controller that handles multiple access methods (url/uri, ajax, post) - El Forum - 07-06-2011

[eluser]adityajoshi[/eluser]
i am having similar problem

<html>
<head>
<title><?php echo $title; ?></title>
</head>
<body>
<h1>Welcome to my blog</h1>
<ol>
<div = "posts">
&lt;?php foreach($query->result() as $row): ?&gt;
&lt;?php echo $row->title ?&gt;
&lt;?php echo $row->text ?&gt;
</div>
&lt;?php
$comment_display = $this->comment_display($row->id);
?&gt;
&lt;form method = "post" action = "http://localhost/feeders/index.php/blog/comment_insert"&gt;
&lt;?php echo form_hidden('entry_id',$this->uri->segment(3)); ?&gt;
<p>&lt;textarea name="text" rows="3"&gt;&lt;/textarea></p>
<p>&lt;input type="text" name="author" /&gt;&lt;/textarea></p>
<p>&lt;input type="submit" value="Submit" /&gt;&lt;/textarea></p>
&lt;/form&gt;
<hr />
&lt;?php endforeach; ?&gt;

</ol>
&lt;/body&gt;
&lt;/html&gt;



My controller is
&lt;?php
var_dump($_POST);
class Blog extends Controller {
function Blog()
{
parent::Controller();
$this->load->scaffolding('comments');
$this->load->helper('form');
$this->load->helper('url');
$this->load->model('blog_model');

}

function index()
{

$data['title'] = "Blog";
$data['list'] = array('first', 'second', 'third');
$data['query'] = $this->blog_model->get_blog_entries();
$this->load->view('blog_view',$data);
}

function comment_display($blog_id)
{
return $this->blog_model->show_comments($blog_id);
}

function comment_insert()
{
$this->db->insert('comments', $_POST);
redirect('blog');
}
}
?&gt;

my model is
&lt;?php
Class Blog_model extends Model
{
function get_blog_entries()
{
return $this->db->get('entries');
}
function show_comments($row_id)
{
$this->db->where('row_id',$row_id)->get('comments');
}
function insert_comment($data)
{
$this->db->insert('comments',$data);
}
}
?&gt;

i am getting the error

( ! ) Fatal error: Call to undefined method CI_Loader::comment_display() in C:\wamp\www\feeders\system\application\views\blog_view.php on line 21


can any one guide me