Existing Repeat Entry Expanded Flag

// Replace with your Repeat field's component_id
var repeat_field_id = 'YOUR_REPEAT_COMPONENT_ID';
// Replace with your flag field's component_id
var flag_field_component_id = 'YOUR_FLAG_FIELD_COMPONENT_ID';

// Set the repeat group component id that this script should respond to
var repeat_field_id = 'REPLACE_WITH_REPEAT_FIELD_COMPONENT_ID';
// Set the field component id inside the repeat entry that should be set as a flag when expanded
var flag_field_component_id = 'REPLACE_WITH_FLAG_FIELD_COMPONENT_ID';
// Set the field flag value to true on the provided input element and trigger change so repeat logic saves
function set_flag_value_on_input( flag_input_element ) {
  // Get the input type to handle different element types
  var input_type = ( flag_input_element.attr( 'type' ) || '' ).toLowerCase();
  // Get the tag name to determine how to set the value
  var tag_name = ( flag_input_element.prop( 'tagName' ) || '' ).toLowerCase();
  // Check if the input is a checkbox that needs a checked state
  if ( tag_name === 'input' && input_type === 'checkbox' ) {
    // Set the checkbox as checked
    flag_input_element.prop( 'checked', true );
    // Trigger the change event to ensure repeat entry logic captures this update
    flag_input_element.trigger( 'change' );
    // Stop further processing because the checkbox case is complete
    return;
  }
  // Set the flag value to 'true' for generic input, textarea, and select elements
  flag_input_element.val( 'true' );
  // Trigger the change event to ensure repeat entry logic captures this update
  flag_input_element.trigger( 'change' );
}
// Find the flag field input inside the provided repeat entry panel using stable selectors
function find_flag_input_in_repeat_panel( repeat_entry_panel ) {
  // Try the stable wrapper id that includes the component id in the format #component-<component_id> and select the input content
  var flag_input = repeat_entry_panel.find( '#component-' + flag_field_component_id + ' .input_content' );
  // Fall back to scanning common form controls within the same wrapper id if input_content is not present
  if ( !flag_input.length ) flag_input = repeat_entry_panel.find( '#component-' + flag_field_component_id + ' input, #component-' + flag_field_component_id + ' textarea, #component-' + flag_field_component_id + ' select' );
  // Fall back to data-component_id wrapper with the standard input_content child if the id-based selector fails
  if ( !flag_input.length ) flag_input = repeat_entry_panel.find( '[data-component_id=\'' + flag_field_component_id + '\'] .input_content' );
  // Fall back to data-component-id (hyphen) wrapper with the standard input_content child if the underscore attribute is not present
  if ( !flag_input.length ) flag_input = repeat_entry_panel.find( '[data-component-id=\'' + flag_field_component_id + '\'] .input_content' );
  // Fall back to scanning all inputs and matching by the closest wrapper that carries either data-component id attribute or the #component- id
  if ( !flag_input.length ) flag_input = repeat_entry_panel.find( '.input_content, input, textarea, select' ).filter( function() {
    // Get the current element as a jQuery object
    var el = $( this );
    // Find the closest wrapper that has a component identifier attribute or a matching id pattern
    var wrapper = el.closest( '[data-component_id],[data-component-id],[id^=\'component-\']' );
    // Get the wrapper id or an empty string when not present
    var wrapper_id = wrapper.attr( 'id' ) || '';
    // Return true if the wrapper matches the flag component id using any supported attribute or id format
    return wrapper.attr( 'data-component_id' ) === flag_field_component_id ||
      wrapper.attr( 'data-component-id' ) === flag_field_component_id ||
      wrapper_id === ( 'component-' + flag_field_component_id );
  } );
  // Return the found flag input element or an empty jQuery object for the calling code to handle
  return flag_input;
}
// Determine whether the provided repeat entry panel belongs to the configured repeat group
function is_target_repeat_panel( repeat_entry_panel ) {
  // Find the closest repeat wrapper for this entry
  var repeat_wrapper = repeat_entry_panel.closest( '.formyoula-Repeat' );
  // Return false when the repeat wrapper is not found, which should not happen in normal cases
  if ( !repeat_wrapper.length ) return false;
  // Get the repeat wrapper id which is formatted as component-<repeat_component_id>
  var repeat_wrapper_id = repeat_wrapper.attr( 'id' ) || '';
  // Return whether the current wrapper matches the configured repeat component id
  return repeat_wrapper_id === ( 'component-' + repeat_field_id );
}
// Handle the action that sets the flag when a repeat entry is interacted with
function handle_repeat_entry_flag( repeat_entry_panel ) {
  // Ensure this panel belongs to the configured repeat group before proceeding
  if ( !is_target_repeat_panel( repeat_entry_panel ) ) return;
  // Find the flag field input inside this repeat entry panel
  var flag_input = find_flag_input_in_repeat_panel( repeat_entry_panel );
  // If the flag input is found, set its value to 'true' and trigger a change event
  if ( flag_input.length ) {
    // Set the flag value on the input and trigger change
    set_flag_value_on_input( flag_input.first() );
    // Stop processing after a successful update
    return;
  }
  // Collect available component wrapper identifiers to help with troubleshooting when the field is not found
  var available_wrappers = repeat_entry_panel.find( '[id^=\'component-\'],[data-component_id],[data-component-id]' ).map( function() {
    // Return the most useful identifier for each wrapper in priority order
    return $( this ).attr( 'id' ) || $( this ).attr( 'data-component_id' ) || $( this ).attr( 'data-component-id' ) || '';
  } ).get();
  // Log a helpful message when the flag field is not found inside the repeat entry
  console.log( 'Field not found in repeat entry for component id: ' + flag_field_component_id + '. Available component wrappers in this entry: ', available_wrappers );
}
// Listen to clicks on existing repeat entry headers
$( document ).on( 'click', '.existing_repeat_entry_panel .panel-heading', function( event ) {
  // Get the current repeat entry panel container from the clicked header
  var repeat_entry_panel = $( this ).closest( '.existing_repeat_entry_panel' );
  // Handle the repeat entry flag logic for this panel
  handle_repeat_entry_flag( repeat_entry_panel );
} );
// Listen to the Bootstrap collapse shown event
$( document ).on( 'shown.bs.collapse', '.existing_repeat_entry_panel .panel-collapse', function( event ) {
  // Get the current repeat entry panel container from the opened collapse section
  var repeat_entry_panel = $( this ).closest( '.existing_repeat_entry_panel' );
  // Handle the repeat entry flag logic for this panel
  handle_repeat_entry_flag( repeat_entry_panel );
} );

User expands entry → Flag set to 'true' → Field Update triggers → Other fields update