How to pre-fill form field values

Created by Phil Kurth, Modified on Fri, 24 Jun, 2022 at 9:39 AM by Phil Kurth

When using the advanced_form() function to render a form, you may use the `values` form arg to pre-fill field values. e.g; 

advanced_form( 'FORM_KEY', [
  'values' => [
    'first_name' => 'John',
    'last_name' => 'Doe',
] );

Note that the `values` form arg will only work when rendering a form using the function — the [advanced_form ...] shortcode does not support the use of the `values` argument. 

You may also choose to programmatically pre-fill values using the af/field/prefill_value filter.

function prefill_field_value_example( $value, $field, $form, $args ) {
  // If we aren't handling the desired form, return early.
  if ( $form['key'] !== 'FORM_KEY_HERE' ) {
    return $value;

  // Set the value for desired fields.
  if ( $field['name'] === 'first_name' ) {
    return 'John';

  if ( $field['name'] === 'last_name' ) {
    return 'Doe';

  return $value;
add_filter( 'af/field/prefill_value', 'prefill_field_value_example' );

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