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Form Validation in codeigniter

In this article, we will implement form validation in codeigniter.

Steps

To implement form validation, we will follow these steps.

      1. Create a textbox and a "submit" button in a view.

      2. Load the "Form" helper in the controller class.

      3. Load the "form_validation" library in the controller class.

      4. Apply form validation rules using "set_rules" method.

      5. Call "run" method to validate data.

Let us work on each step.

View changes

In view, we will create a textbox and a "submit" button

<body>
	<div id="container">
		<div id="body"></div>
	</div>
	<?php echo form_open(); 
   echo form_input('username', "); 
   echo form_submit('mysubmit', 'Click Me'); 
   echo form close();?>
</body>
</html>

Controller Changes

As discussed above, we will

      1. Load the "Form" helper in controller class.

      2. Load the "form_validation" library in controller class.

      3. Apply form validation rules using "set_rules" method.

      4. Call "run" method to validate data.

Here is the code

public function Index() { 
$this->load->helper('form'); 
$this->load->library('form_validation'); 
$this->load->view('users'); 
$this->form validation->set rules('username', 'Username', 'required'); 
  if ($this->form_validation->run() == FALSE) { 
    echo "Please enter user name";
  } 
  else{ 
    echo "Valid user name";
  }
}

In the above code, "required" is the validation rule.

Output

See the page on the browser.

Picture showing the view when page gets loaded

Click to Enlarge

The reason for this message is - on page load there is no value assigned to the textbox.

Now, fill the value and click on the "Click Me" button. You will get the following output

Picture showing the validation message when page is submitted with empty textbox

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Wednesday, August 5, 2020

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