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Form Validation - Requiring one input OR the other

#1
[eluser]gstjohn[/eluser]
I'm new to CodeIgniter, but love it already. Was hoping to get a hand with some confusion with the form validation. Best as I can tell there is nothing about it specifically on this forum.

I have a form that collects city and state OR zip code. I can't for the life of me figure out how to validate this with CI. Obviously just using required for all three doesn't cut it since it's an OR situation. Best as I can tell a callback won't work either.

Am I just being ridiculous and not seeing the solution? If there is no way to check this with the validation library, how would I validate it myself and push the error message to the view?

Thanks in advance!

#2
[eluser]missionsix[/eluser]
use an if statement to check if the fields are filled, before you build your requirements. As such:

Code:
<?php

$this->load->library('form_validation');

$this->form_validation->set_error_delimiters('<p class="error">', '</p>');

if(empty($this->input->post('zipcode')) {
  
    $this->form_validation->set_rules('city', 'City', 'trim|required');
    $this->form_validation->set_rules('state', 'State', 'trim|required');

} else {

    $this->form_validation->set_rules('zip', 'Zip Code', 'trim|required');

}


if($this->form_validation->run()=== false) {
    // display errors
} else {
   //save form
}
?&gt;

Rules are set after the form is sent to the browser, so you still have access to $_POST vars from there in ($this->input->post(KEY); ). Hope that helps.

#3
[eluser]gstjohn[/eluser]
Wow! Duh...

That seems so obvious after having seen it. Definitely appreciate the direction!

#4
[eluser]gstjohn[/eluser]
Small note: empty() cannot check the return value of a function or method.

Code:
if (empty($this->input->post('zipcode'))) { ... }

You will get an error saying:

Quote:Fatal error: Can't use method return value in write context in ...

Corrected syntax will need to be:

Code:
$zipcode = $this->input->post('zipcode');
if (empty($zipcode)) { ... }


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