/**
* @file
* System behaviors.
*/
(function ($, Drupal, drupalSettings) {
// Cache IDs in an array for ease of use.
const ids = [];
/**
* Attaches field copy behavior from input fields to other input fields.
*
* When a field is filled out, apply its value to other fields that will
* likely use the same value. In the installer this is used to populate the
* administrator email address with the same value as the site email address.
*
* @type {Drupal~behavior}
*
* @prop {Drupal~behaviorAttach} attach
* Attaches the field copy behavior to an input field.
*/
Drupal.behaviors.copyFieldValue = {
attach(context) {
// List of fields IDs on which to bind the event listener.
// Create an array of IDs to use with jQuery.
Object.keys(drupalSettings.copyFieldValue || {}).forEach((element) => {
ids.push(element);
});
if (ids.length) {
// Listen to value:copy events on all dependent fields.
// We have to use body and not document because of the way jQuery events
// bubble up the DOM tree.
$('body')
.once('copy-field-values')
.on('value:copy', this.valueTargetCopyHandler);
// Listen on all source elements.
$(`#${ids.join(', #')}`)
.once('copy-field-values')
.on('blur', this.valueSourceBlurHandler);
}
},
detach(context, settings, trigger) {
if (trigger === 'unload' && ids.length) {
$('body').removeOnce('copy-field-values').off('value:copy');
$(`#${ids.join(', #')}`)
.removeOnce('copy-field-values')
.off('blur');
}
},
/**
* Event handler that fill the target element with the specified value.
*
* @param {jQuery.Event} e
* Event object.
* @param {string} value
* Custom value from jQuery trigger.
*/
valueTargetCopyHandler(e, value) {
const $target = $(e.target);
if ($target.val() === '') {
$target.val(value);
}
},
/**
* Handler for a Blur event on a source field.
*
* This event handler will trigger a 'value:copy' event on all dependent
* fields.
*
* @param {jQuery.Event} e
* The event triggered.
*/
valueSourceBlurHandler(e) {
const value = $(e.target).val();
const targetIds = drupalSettings.copyFieldValue[e.target.id];
$(`#${targetIds.join(', #')}`).trigger('value:copy', value);
},
};
})(jQuery, Drupal, drupalSettings);