Question

Case: I have a form in the page which enables users to add certain values in a simple text file. Now I want to redirect to the same page after values have been added successfully.

The read/write code all works great, I even put redirection code but this would display warning that header information is already sent.

Headers I tried:

header("Location: some_url_here_in_same_site");
wp_redirect("some_url_here_in_same_site");

My Form code:

if(isset($_POST['txtName'])}

    // form validation code here
    if(successful)
        wp_redirect("some_url_here_in_same_site");

}

PROBLEM:

• how can we do redirection in wordpress after form submission in our plugin?
• ob_start wonb’t work, so don’t suggest me this either

Answer 1

Ok I managed to do it using Hooks. I did redirection using the code below. Note that the form action is set to admin-post.php

<form action="admin-post.php" name="frmHardware" id="frmHardware" method="post">
    <!-- form elements -->
    <!-- Essential field for hook -->
    <input type="hidden" name="action" value="save_hw" />
</form>

Then in my plugin’s main file, I added the following:

add_action('admin_init', 'RAGLD_dashboard_hardware_init' ); // action hook add/remove hardware

Where, the function definition is as follows:
Also note that the first argument is derived from admin_post which is a reserved word is combined with the action hidden field in the form above.

function RAGLD_dashboard_hardware_init() {
    // checking for form submission when new hardware is added
    add_action( 'admin_post_save_hw', 'RAGLD_process_hw_form' );
}

after the evaluation that form has been submitted in above add_action, function RAGLD_process_hw_form will be called which is meant to validate form entries and take actions/redirections accordingly.

function RAGLD_process_hw_form() {
    if (form_is_validated) {
        wp_redirect( add_query_arg( array('page' => 'ragld/edit-hardware', 'action'=> 'InvalidData'), admin_url() ));
    } else {
        //do something else
    }
}

This is the solution I could think of for the time being, you can suggest your answers if you feel they are more effective.