CodeIgniter - Form Validation

Form Validation

Validation  is  an  important  process  while  building  web  application.  It  ensures  that  the data  that  we  are  getting  is  proper  and  valid  to  store  or  process.  CodeIgniter  has  made this task very easy. Let us understand this process with a simple example.
Example

Create       a       view       file       myform.php       and       save       the       below       code       it       in application/views/myform.php.  This  page  will  display  form  where  user  can  submit his  name  and  we  will  validate  this  page  to  ensure  that  it  should  not  be  empty  while submitting.

<html>
<head>
<title>My  Form</title>
</head>
<body>
<form  method  =  ""  action  =  "">
<?php  echo  validation_errors();  ?>
<?php  echo  form_open('form');  ?>
<h5>Name</h5>
<input  type="text"  name="name"  value=""  size="50"  />
<div><input  type="submit"  value="Submit"  /></div>
</form>
</body>

</html>

Create  a  view  file  formsuccess.php  and  save  it  in application/views/formsuccess.php.   This   page   will   be   displayed   if   the   form   is validated successfully.

<html>

<head>
<title>My  Form</title>
</head>
<body>
<h3>Your  form  was  successfully  submitted!</h3>
<p><?php  echo  anchor('form',  'Try  it  again!');  ?></p>
</body>

</html>

Create  a  controller  file  Form.php  and  save  it  in  application/controller/Form.php. This   form   will   either,   show   errors   if   it   is   not   validated   properly   or   redirected   to formsuccess.php page.

<?php
class  Form  extends  CI_Controller  { public  function  index()
{
/*  Load  form  helper  */
$this->load->helper(array('form'));
/*  Load  form  validation  library  */
$this->load->library('form_validation');
/*  Set  validation  rule  for  name  field  in  the  form  */
$this->form_validation->set_rules('name',  'Name',  'required');
if  ($this->form_validation->run()  ==  FALSE)
{
$this->load->view('myform');
}
else
{
$this->load->view('formsuccess');

}

}

}

Add the following line in application/config/routes.php.

$route['validation']  =  'Form';

Let  us  execute  this  example  by  visiting  the  following  URL  in  the  browser.  This  URL  may be different based on your site.
http://yoursite.com/index.php/validation

It will produce the following screen:
Figure: Validation Form

We  have  added  a  validation  in  the  controller  – Name  is  required  field  before  submitting the  form.  So,  if  you  click  the  submit  button  without  entering  anything  in  the  name  field, then  you  will  be  asked  to  enter  the  name  before  submitting  as  shown  in  the  screen below.


Figure: Form Not Validated Successfully

After  entering  the  name  successfully,  you  will  be  redirected  to  the  screen  as  shown below.

Figure: Form Not Validated Successfully


In  the  above  example,  we  have  used  the  required  rule  setting.  There  are  many  rules available in the CodeIgniter, which are described below.
Validation Rule Reference

The following is a list of all the native rules that are available to use:














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