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CI 2.1.0 form validation external callbacks via the newly available param - Printable Version

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+--- Thread: CI 2.1.0 form validation external callbacks via the newly available param (/showthread.php?tid=47178)

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 11-28-2011

[eluser]skunkbad[/eluser]
I've done my share of bitching about CI lately, nevertheless, I thought I'd share a little code that makes working with bigger applications more manageable. CI does not by itself accommodate external callbacks for form validation, and models are a great place to store them, since the CI super object is accessible from inside them.

What I've done is created a generic external_callbacks method in MY_Controller. The method explodes the comma seperated string that contains the model name, method, and any arguments that should be passed along as an array.

Here is the method:

Code:
/*
* external_callbacks method handles form validation callbacks that are not located
* in the controller where the form validation was run.
*
* $param is a comma delimited string where the first value is the name of the model
* where the callback lives. The second value is the method name, and any additional
* values are sent to the method as a one dimensional array.
*
* EXAMPLE RULE:
*  callback_external_callbacks[some_model,some_method,some_string,another_string]
*/
public function external_callbacks( $postdata, $param )
{
$param_values = explode( ',', $param );

// Make sure the model is loaded
$model = $param_values[0];
$this->load->model( $model );

// Rename the second element in the array for easy usage
$method = $param_values[1];

// Check to see if there are any additional values to send as an array
if( count( $param_values ) > 2 )
{
  // Remove the first two elements in the param_values array
  array_shift( $param_values );
  array_shift( $param_values );

  $argument = $param_values;
}

// Do the actual validation in the external callback
if( isset( $argument ) )
{
  $callback_result = $this->$model->$method( $postdata, $argument );
}
else
{
  $callback_result = $this->$model->$method( $postdata );
}

return $callback_result;
}

/*******************************************************************/


CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 01-26-2012

[eluser]ajustesen[/eluser]
CroNIX... do you mind giving a quick example of how you used it with a controller and a model, can't seem to get your Form_validation library version to work.

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 02-02-2012

[eluser]erikig[/eluser]
Hey Brian,

Just wanted to say thanks, its a mighty elegant fix. This was one of the more annoyances of Form Validation (the other being that it only works on _POST instead on any input i.e _GET, _COOKIE etc)

E

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 02-02-2012

[eluser]CroNiX[/eluser]
@ajustesen I'm sorry I didn't see your post til now. Please start a new thread and post what you have tried and I will help. I don't want to mess with Brians thread and I apologize to Brian for posting in his.

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 02-03-2012

[eluser]skunkbad[/eluser]
[quote author="erikig" date="1328234983"]Hey Brian,

Just wanted to say thanks, its a mighty elegant fix. This was one of the more annoyances of Form Validation (the other being that it only works on _POST instead on any input i.e _GET, _COOKIE etc)

E[/quote]

I've never heard of submitting a form with cookie data, but of course $_GET functionality would be useful. Glad you found the code useful.

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 04-19-2012

[eluser]theshiftexchange[/eluser]
just wanted to say thanks - this code is so awesome

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 04-19-2012

[eluser]chenx[/eluser]
Hello.

Thanks for skunkbad for solving my problem with Form Validation.

But still, I have some things needed to be solve here, it's the error message.

Because we're using the function external_callback, the error message only return the error for external_callback.

How can I return the error message from each of my model function?

Sorry for my bad english. Thanks for helping.

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 04-19-2012

[eluser]theshiftexchange[/eluser]
[quote author="chenx" date="1334897650"]
Because we're using the function external_callback, the error message only return the error for external_callback.

How can I return the error message from each of my model function?
[/quote]

You always use the 'external_callback' error message - it will display the error for each of your models as needed

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 05-09-2012

[eluser]LeMec[/eluser]
Hello,

Thanks, for this skunkbad. I looked at your community auth and tried to take the My_form_validation and use it in my project.

I am using HMVC so it did not work.

I also have my models organized in sub directories so the code could not find the specified model.

I have made a few changes that seemed to fix the problem for me...

Code:
public function external_callbacks( $postdata, $param )
{
  $param_values = explode( ',', $param );

  // Make sure the model is loaded
  $model = $param_values[0];

  //Alain: See if there is a path...
  $model_path= explode( '/',$model );
  $model_segments= count($model_path );
  if ($model_segments > 1)
  {
   $modelObj=$model_path[$model_segments -1];
  }
  else
  {
   $modelObj=$model;
  }

  $this->CI->load->model( $model );

  // Rename the second element in the array for easy usage
  $method = $param_values[1];

  // Check to see if there are any additional values to send as an array
  if( count( $param_values ) > 2 )
  {
   // Remove the first two elements in the param_values array
   array_shift( $param_values );
   array_shift( $param_values );

   $argument = $param_values;
  }

  // Do the actual validation in the external callback
  if( isset( $argument ) )
  {
   //Alain: now using $modelObj
   $callback_result = $this->CI->$modelObj->$method( $postdata, $argument );
  }
  else
  {
   //Alain: now using $modelObj
   $callback_result = $this->CI->$modelObj->$method( $postdata );
  }

  return $callback_result;
}

Edit: I also need to enter the full path of where my model is in my validation rules...

So, if I did not enter a path, then this would not find the model, but If I entered a path, then it would find the model load it but when trying to use it it would reference the object with the path.

CI 2.1.0 form validation external callbacks via the newly available param - El Forum - 09-29-2012

[eluser]skunkbad[/eluser]
I've revised the way I'm using external callbacks. I just wanted to be able to use libraries and models at the same time. See comments:

Code:
/**
* Generic callback used to call callback methods for form validation.
*
* @param  string  the value to be validated
* @param  string  a comma separated string that contains the model name,
*                 method name and any optional values to send to the method
*                 as a single parameter.
*
*                 - First value is the external class type (library or model)
*                 - Second value is the name of the class.
*                 - Third value is the name of the method.
*                 - Any additional values are values to be
*                   sent in an array to the method.
*
*      EXAMPLE RULE FOR CALLBACK IN MODEL:
*  external_callbacks[model,model_name,some_method,some_string,another_string]
*  
*      EXAMPLE RULE FOR CALLBACK IN LIBRARY:
*  external_callbacks[library,library_name,some_method,some_string,another_string]
*/
public function external_callbacks( $postdata, $param )
{
$param_values = explode( ',', $param );

// Load the model or library holding the callback
$class_type = $param_values[0];
$class_name = $param_values[1];
$this->CI->load->$class_type( $class_name );

// Apply method name to variable for easy usage
$method = $param_values[2];

// Check to see if there are any additional values to send as an array
if( count( $param_values ) > 3 )
{
  // Remove the first three elements in the param_values array
  $argument = array_slice( $param_values, 3 );
}

// Do the actual validation in the external callback
if( isset( $argument ) )
{
  $callback_result = $this->CI->$class_name->$method( $postdata, $argument );
}
else
{
  $callback_result = $this->CI->$class_name->$method( $postdata );
}

return $callback_result;
}