ninja_forms_register_field

ninja_forms_register_field.php

<?php
function register_my_custom_field() {
  $args = array(
    'name' => 'My Custom Field', 
    'edit_options' => array( 
      array(
        'type' => 'text',
        'name' => 'my_text',
        'label' => 'My Text Label', 
        'class' => 'widefat',
      ),
      array(
        'type' => 'select',
        'name' => 'my_select',
        'label' => 'My Select Label',
        'options' => array(
          array( 'name' => 'Item 1', 'value' => 'item_1' ),
          array( 'name' => 'Item 2', 'value' => 'item_2' ),
          array( 'name' => 'Item 3', 'value' => 'item_3' ),
        ),
      ),
    ),
    'display_function' => 'my_new_field_display',
    'edit_function' => 'my_new_field_edit',
    'sidebar' => 'template_fields',
    'pre_process' => 'my_new_field_pre_process',
    'process' => 'my_new_field_process',
  );
  
  if( function_exists( 'ninja_forms_register_field' ) ) {
    ninja_forms_register_field('my_field', $args);
  }
}

add_action( 'init', 'register_my_custom_field' );
/*
 * This function outputs HTML for the backend editor.
 * The naming convention is: ninja_forms_field_4[custom_value].
 * It will be available as $data[custom_value].
 *	
 * $field_id is the id of the field currently being edited.
 * $data is an array of the field data, including any custom variables.
 *
*/
function my_new_field_edit( $field_id, $data ){
  if( isset( $data['my_value'] ) ){
    $my_value = $data['my_value'];
  }else{
    $my_value = '';
  }
  ?>
  <input type="text" name="ninja_forms_field_<?php echo $field_id;?>[my_value]" value="<?php echo $my_value;?>">
  <?php
}

/*
 * This function only has to output the specific field element. The wrap is output automatically.
 *
 * $field_id is the id of the field currently being displayed.
 * $data is an array the possibly modified field data for the current field.
 *
*/
function my_new_field_display( $field_id, $data ){
  if( isset( $data['my_value'] ) ){
    $my_value = $data['my_value'];
  }else{
    $my_value = '';
  }
  ?>
  <input type="text" name="ninja_forms_field_<?php echo $field_id;?>" value="<?php echo $my_value;?>">
  <?php
}