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CodeIgniter Form Validation — Conditional Required Field

CodeIgniter conditional required fields

This is a quick tip if your’re looking for a “required_if” rule in CodeIgniter. Basically the rule is as follows: Make form field-A required if form field-B is filled in. The most common case scenario is changing a password, where the original password is required first, but is conditional only if a new password is entered.

Change Password

If your form validation rules are defined on runtime you can simply modify your rules during processing as such:

$required_if = $this->input->post('password') ? '|required' : '' ;
$this->form_validation->set_rules('current_password', 'current password', 'trim'. $required_if .'|min_length[6]');			
$this->form_validation->set_rules('password', 'password', 'trim|min_length[6]|matches[password_confirm]');
$this->form_validation->set_rules('password_confirm', 'password confirmation', 'trim');

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Posted in | Tagged , , | 15 Responses

15 responses to “CodeIgniter Form Validation — Conditional Required Field”

  1. David
    David June 12, 2010 at 7:23 am |

    heya! thanks for this. worked like a charm.

  2. Nextra
    Nextra September 1, 2010 at 6:34 am |

    Good tip, works great. Thanks.

  3. Tahsin Hasan
    Tahsin Hasan October 10, 2010 at 5:46 am |

    Hi,

    see the codeigniter validation library on tahsin’s garage

  4. John
    John July 13, 2011 at 7:53 am |

    I’ve encountered a problem while trying to confirm a password as you did above: When there’s a mismatch between password and confirm, it says “The Password field does not match the password_confirm field”, instead of “The Password field does not match the password confirmation field”.

  5. Dimas
    Dimas July 13, 2011 at 7:59 am |

    @John, the second param in set_rules() is the pretty label, make sure that is set properly.

    $this->form_validation->set_rules('password_confirm', 'password confirmation', 'trim');
  6. Rik Davis
    Rik Davis December 6, 2011 at 3:58 pm |

    I thought I would post this here. Perhaps others might find it useful. I developed this form validation library as an attempt to try to somewhat replicate Perl’s DataFormValidator module.

    Code Igniter Form Validate
    Please leave comments on the Github page rather then here.

  7. Sidou
    Sidou April 11, 2012 at 6:59 am |

    Good stuff man!
    Thanks a lot for the trick 🙂

  8. naspard
    naspard May 28, 2012 at 1:03 am |

    very big thank’s bro
    it’s very usefull

    thank’s

  9. raj
    raj August 9, 2012 at 4:35 am |

    nice and useful

  10. Vaibhav
    Vaibhav August 9, 2012 at 6:44 pm |

    this is cool tip bro

  11. Lord Byron
    Lord Byron September 12, 2012 at 2:45 am |

    Ooh! Very nice…
    I was trying this in my ‘MY_Form_Validation’ class, for hours, without luck.
    This is so good! Soooo easy!
    Thank you! Thank you!

  12. codeigniter forms
    codeigniter forms June 3, 2013 at 10:27 pm |

    Try http://codeigniterforms.com for rapid form generation in codeigniter and save your time

  13. Razibul Hasan
    Razibul Hasan December 29, 2014 at 12:56 am |

    I am a codeigniter developer. Now i am doing a new security option. This post is really too strong.

  14. Diploma Study
    Diploma Study December 29, 2014 at 12:59 am |

    Our organization use this rules. Now it’s more safety & strong login system.

  15. Saurabh Kumar Singh
    Saurabh Kumar Singh September 29, 2015 at 11:53 pm |

    Form validation in Codeigniter 3.0
    http://www.stepblogging.com/form-validation-in-codeigniter-3-0/