I’m creating a plugin, that creates a custom post type called cars. I also created a template for it.

add_action( 'template_include', 'on_template_include' );
    public function on_template_include($original_template)
    {
      global $wp;

      $custom_post_types = array($this->custom_post_name);

      if (in_array($wp->query_vars['post_type'], $custom_post_types))
      {
        if (is_singular($this->custom_post_name))
        {
          $original_template = plugin_dir_path(__FILE__).'template/single-car.php';
        }
        else 
        {
          $original_template = plugin_dir_path(__FILE__).'template/page-car.php';
        }
      }

      return $original_template;
    }

Right now, when I enter
http://localhost/cars
the page redirects to the page without problem.

What I want to do is, add a custom search to the page.

<div class="stock_search_form_wrapper">
  <div class="stock_search_form">
    <h3>Search Our Stock</h3>
    <form action="/cars/" method="get" id="searchform">
      <fieldset class="field-make">
        <label for="formfield_search_make">Make</label>
        <select class="csform" name="make" id="formfield_search_make">
        <option>All</option>
        <option value="ABC">ABC</option>
        <option value="DEF">DEF</option>
        </select>
      </fieldset>
      <fieldset class="submit">
        <input type="submit" id="formfield_search_submit" value="search">
      </fieldset>
    </form>
  </div>
</div>

When I submit page, I want it to redirect to the same page and I will change the query variables accordingly. The page goes to
http://localhost/cars/?make=ABC

But the page says ‘Object Not Found’. It doesn’t even go to 404 page. Template redirect code does not run either.

I figure I might need to add some rewrite code. I’ve found some codes and tried to change it but no success there either. Whatever I tried, the page says ‘Object Not Found’. (I updated permalinks.)

Thank you for your help,

Read more here: WordPress – URL Parameters on Custom Post Type Templates


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