Virtual field type

Use the Virtual field type to define a virtual field.

Supported virtual field types

oik-fields provides two virtual fields which you can use with the fields= parameter for shortcodes that supports it.

Name	Title	Notes
file_size	File size	Displays the file size in bytes of an attachment
dimensions	Dimensions	Displays the width and height of an attached image

Sample code

In this example, taken from oik-shortcodes we create a virtual field called _oik_sc_the_title_cb which is a checkbox indicating whether or not a shortcode will be expanded during the_title filter processing.

You appear to be a bot. Output may be restricted

  $the_title_args = array( "#callback" => "bw_get_shortcode_expands_in_titles"
                         , "#parms" => "_oik_sc_code" 
                         , "#plugin" => "oik"
                         , "#file" => "shortcodes/oik-codes.php"
                         , "#form" => false
                         , "#hint" => "virtual field"
                         ); 
  bw_register_field( "_oik_sc_the_title_cb", "virtual", "Expands in 'the_title'?", $the_title_args );
  bw_register_field_for_object_type( "_oik_sc_the_title_cb", "oik_shortcodes" );
 

Form display

When displayed in the Fields meta box

bw_fields display

When displayed by [bw_fields] it appears like this.

Notes

Related

• bw_form_field_virtual() – Implement bw_form_field_ hook for ‘virtual’ field
• bw_get_shortcode_expands_in_titles() – Return Yes / No to indicate if a shortcode expands in titles
• bw_theme_field_virtual() – Theme a field of type ‘virtual’

• oik-fields – requirements and implementation overview
• oik-fields – Field Types
  • checkbox field type
  • currency field type
  • date field type
  • email field type
  • noderef field type
  • numeric field type
  • select field type
  • text field type
  • textarea field type
  • URL field type
  • Virtual field type
• oik-fields – Field Attributes
• oik-fields – Implementing a new custom field
• oik-fields – unique features