9

I want to have a link to create a new post that sets the category also.

I have tried wp-admin/post-new.php?post_category=12 and wp-admin/post-new.php?cat=12, but neither worked. I also tried using the name rather than the id of the category; which also had no affect.

How do I create a link to a new post with a default category?

4 Answers 4

5

Dave James Miller over at GitHub nailed this one for me. None of the work is from me, I'm just posting his code wrapped into a plguin since it works perfectly as advertised:

<?php
/**
 * Plugin Name: Set default category from url parameter
 * Plugin URI:  https://gist.github.com/davejamesmiller/1966543
 * Description: enables you to setup new post links with the post_title, category and tags in the url: <code><a href="<?= esc_attr(admin_url('post-new.php?post_title=Default+title&category=category1&tags=tag1,tag2')) ?>">New post</a></code>
 * Version:     0.0.1
 * Author:      davejamesmiller
 * Author URI:  https://gist.github.com/davejamesmiller
 */

// I used this code to automatically set the default post title, category and
// tags for a new WordPress post based on which link was clicked. It could also
// be tweaked to hard-code the values instead of using request parameters.


add_filter('wp_get_object_terms', function($terms, $object_ids, $taxonomies, $args)
{
    if (!$terms && basename($_SERVER['PHP_SELF']) == 'post-new.php') {

        // Category - note: only 1 category is supported currently
        if ($taxonomies == "'category'" && isset($_REQUEST['category'])) {
            $id = get_cat_id($_REQUEST['category']);
            if ($id) {
                return array($id);
            }
        }

        // Tags
        if ($taxonomies == "'post_tag'" && isset($_REQUEST['tags'])) {
            $tags = $_REQUEST['tags'];
            $tags = is_array($tags) ? $tags : explode( ',', trim($tags, " \n\t\r\0\x0B,") );
            $term_ids = array();
            foreach ($tags as $term) {
                if ( !$term_info = term_exists($term, 'post_tag') ) {
                    // Skip if a non-existent term ID is passed.
                    if ( is_int($term) )
                        continue;
                    $term_info = wp_insert_term($term, 'post_tag');
                }
                $term_ids[] = $term_info['term_id'];
            }
            return $term_ids;
        }
    }
    return $terms;
}, 10, 4);
1
  • Using the above method works great, however it would appear that advanced custom fields (another popular plug-in) rules that rely on post category, don't load correctly (i.e the custom fields for that category do not load). Has anyone figured a workaround for this?
    – Aphire
    Nov 5, 2015 at 17:37
9

Hook into wp_insert_post, test the post status for auto-draft, and the URL for a GET parameter.

But first we need a helper function to get and sanitize the GET parameter:

/**
 * Set default category.
 *
 * @wp-hook pre_option_default_category
 * @return  string Category slug
 */
function t5_get_default_cat_by_url()
{
    if ( ! isset( $_GET['post_cat'] ) )
        return FALSE;

    return array_map( 'sanitize_title', explode( ',', $_GET['post_cat'] ) );
}

Now the auto-draft handler:

add_action( 'wp_insert_post', 't5_draft_category', 10, 2 );

/**
 * Add category by URL parameter to auto-drafts.
 *
 * @wp-hook wp_insert_post
 * @param   int $post_ID
 * @param   object $post
 * @return  WP_Error|array An error object or term ID array.
 */
function t5_draft_category( $post_ID, $post )
{
    if ( ! $cat = t5_get_default_cat_by_url()
        or 'auto-draft' !== $post->post_status )
        return;

    // return value will be used in unit tests only.
    return wp_set_object_terms( $post_ID, $cat, 'category' );
}

This works only if get_default_post_to_edit() was called with the second parameter $create_in_db set to TRUE. To catch the other case you have to filter the option default_category:

add_filter( 'pre_option_default_category', 't5_get_default_cat_by_url' );

Now you can use the parameter post_cat to pass a comma separated list of category slugs:

enter image description here

See also:

4
  • I tried this solution by pasting the code into my functions.php file and it didn't work. Am I missing something? Do I need to do more like call the function to make it do the job?
    – Jamie
    Jan 16, 2015 at 0:40
  • @Jamie Didn't work is too vague. :)
    – fuxia
    Jan 16, 2015 at 0:42
  • I thought by adding the code into functions.php that when I tick a category, it would add that parameter to the end of the string like in the photo above. I am trying to add a metabox to only a specific category. Then I will use $_GET to test if I am in the correct category to load the metabox. When I tried the code and tried to replicate what is in your photo above, nothing happened. All I got was wp-admin/post-new.php. I am trying to get wp-admin/post-new.php?post_cat=audio
    – Jamie
    Jan 16, 2015 at 0:50
  • @Jamie This code works the other way around: You build the link manually (for example to send it to someone per email), and the code will set the proper category. It doesn’t create any link.
    – fuxia
    Jan 16, 2015 at 0:53
1

I think you can go about the default option default_category and filter option_default_category this, if the url have a param for the category, like this example source. Use it as plugin, test it. Was write from scratch and not tested.

The url param is post_cat and you can set the category, like this url: /wp-admin/post-new.php?post_cat=categoryname

<?php
/**
 * Plugin Name: .my Test
 * Plugin URI:  http://bueltge.de/
 * Description: 
 * Version:     0.0.1
 * Author:      Frank B&uuml;ltge
 * Author URI:  http://bueltge.de/
 */
class Set_Default_Cat_From_Url_Param {

    protected static $classobj = NULL;

    public static function init() {

        NULL === self::$classobj and self::$classobj = new self();

        return self::$classobj;
    }

    function __construct() {

        if ( isset( $_GET['post_cat'] ) )
            add_filter( 'option_default_category', array( $this, 'get_category' ) );
    }

    function get_category( $category ) {

        if ( isset( $_GET['post_cat'] ) )
            $category = get_cat_ID( esc_attr( $_GET['post_cat'] ) );

        return $category;
    }

}
add_action( 'load-post-new.php', array( 'Set_Default_Cat_From_Url_Param', 'init' ) );
0

I realize this has already been answered, but I wanted to add my own take. I've added it to a gist here https://gist.github.com/malcalevak/ba05b4fbed0c6e33ac8c18c1451bd857

To save you the hassle, though, here's the code:

function set_category () {

    global $post;
  //Check for a category parameter in our URL, and sanitize it as a string
    $category_slug = filter_input(INPUT_GET, 'category', FILTER_SANITIZE_STRING, array("options" => array("default" => 0)));

  //If we've got a category by that name, set the post terms for it
    if ( $category = get_category_by_slug($category_slug) ) {
        wp_set_post_terms( $post->ID, array($category->term_id), 'category' );
    }

}

//hook it into our post-new.php specific action hook
add_action( 'admin_head-post-new.php', 'set_category', 10, 1 );

Similar to all the others, you'd trigger it via /wp-admin/post-new.php?category=categoryname

FYI, if you're using Advanced Custom Fields, like @Aphire, this WILL work.

8
  • this works if it is a simple post. If there is a post_type parameter, it does not work. How can i fix this to recognize wp-admin/post-new.php?post_type=wpdmpro?category=mycategory
    – yurividal
    Jan 2, 2019 at 21:33
  • @yurividal unfortunately, I don't have an environment set up at the moment, any my memory is hazy, but a quick look at the WordPress Download Manager code looks like the issue might be that it's using a custom Taxonomy that "looks" like the built-in Category Taxonomy, but isn't.
    – Malcalevak
    Jan 2, 2019 at 23:15
  • @yurividal didn't mean to end the comment. You'll likely need to adjust the get_category_by_slug function with one to get_term_by and then adjust wp_set_post_terms to set the custom wpdmcategory Taxonomy.
    – Malcalevak
    Jan 2, 2019 at 23:23
  • Wow, that sounds a little complicated and I don't think I have enough php skills for that. Anyways, thank you for your help, I'll try to dig deeper into that.
    – yurividal
    Jan 3, 2019 at 10:15
  • @yurividal I don't think it would be that complicated, but I could definitely see it as daunting to the less well initiated with PHP and/or WordPress. If I can find time to spare, I'll try to throw something together, my only concern is that I can't currently test it, which would make diagnosing issues a bit... complicated.
    – Malcalevak
    Jan 3, 2019 at 21:21

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