How to add a button to custom post type's posts-page

Question

How can I add a button to a posts -page. (In this case a custom post type).

I'd like to place it next to, or near, the "Add new" button, to import content from a web service.

Answer 1

You can add button via add_meta_box function.

function add_your_meta_box(){

add_meta_box('your-metabox-id', 'Title', 'function_of_metabox', 'custom_post_type', 'side', 'high');}

add_action('add_meta_boxes', 'add_your_meta_box'); 

function function_of_metabox()
{?>
    <input type="submit" class="button button-primary button-large" value="Add New" id="add-new"/>
<?php }

if you add to multiple post type, you should use foreach loop.

function add_your_meta_box(){

  $types = array("post","page","custom_post_type");

  foreach($types as $type){

    add_meta_box('your-metabox-id', 'Title', 'function_of_metabox', $type, 'side', 'high');}

}

add_action('add_meta_boxes', 'add_your_meta_box'); 

Answer 2

Like this:

function custom_js_to_head() {
    ?>
    <script>
    jQuery(function(){
        jQuery("body.post-type-YOUR-CUSTOM-POST-TYPE .wrap h1").append('<a href="index.php?param=your-action" class="page-title-action">Import from ...</a>');
    });
    </script>
    <?php
}
add_action('admin_head', 'custom_js_to_head');

That code (pasted to functions.php) will dynamically add new link tag after "Add new" link.