Wordpress filter to handle custom action button on custom post type - custom-post-type

Question

I have created custom post type called campaign, then I have create custom action button using post_row_actions filter like this.
function hipwee_add_action_button($actions, $post){
if(get_post_type() === 'campaign'){
$actions['export'] = 'Export Result';
}
return $actions;
}
add_filter( 'post_row_actions', 'hipwee_add_action_button', 10, 2 );
as you can see above, I added new action button called "Export Result",
but now, how to add a function to handle the export, is there available wordpress filter to put my custom action handler?

Answer 1

Try this code:
function hipwee_add_action_button($actions, $post){
if(get_post_type() === 'campaign'){
$url = add_query_arg(
array(
'post_id' => $post->ID,
'my_action' => 'custom_export_post',
)
);
$actions['export'] = '<a href="' . esc_url( $url ) . '" target="_blank" >Export Result</a>';
}
return $actions;
}
add_filter( 'post_row_actions', 'hipwee_add_action_button', 10, 2 );
add_action( 'admin_init', 'custom_export_function' );
function custom_export_function(){
if ( isset( $_REQUEST['my_action'] ) &&
'custom_export_post' == $_REQUEST['my_action'] ) {
$data = array(
'hello' => 'world'
);
header('Content-Type: application/json');
header('Content-Disposition: attachment; filename="sample.json"');
echo json_encode($data);
exit;
}
}
What it does:
When Export Result button is clicked, it opens new window with parameter my_action with value custom_export_post. Now another function custom_export_function is hooked to admin_init. This function acts as the main exporter. In the example a sample array is exported to JSON file. You can now customize function as you require.