238 lines
8.1 KiB
JavaScript
238 lines
8.1 KiB
JavaScript
/**
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* @file
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* Form features.
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*/
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/**
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* Triggers when a value in the form changed.
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*
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* The event triggers when content is typed or pasted in a text field, before
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* the change event triggers.
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*
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* @event formUpdated
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*/
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(function ($, Drupal, debounce) {
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'use strict';
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/**
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* Retrieves the summary for the first element.
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*
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* @return {string}
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*/
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$.fn.drupalGetSummary = function () {
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var callback = this.data('summaryCallback');
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return (this[0] && callback) ? $.trim(callback(this[0])) : '';
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};
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/**
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* Sets the summary for all matched elements.
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*
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* @param {function} callback
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* Either a function that will be called each time the summary is
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* retrieved or a string (which is returned each time).
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*
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* @return {jQuery}
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*
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* @fires event:summaryUpdated
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*
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* @listens event:formUpdated
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*/
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$.fn.drupalSetSummary = function (callback) {
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var self = this;
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// To facilitate things, the callback should always be a function. If it's
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// not, we wrap it into an anonymous function which just returns the value.
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if (typeof callback !== 'function') {
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var val = callback;
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callback = function () { return val; };
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}
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return this
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.data('summaryCallback', callback)
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// To prevent duplicate events, the handlers are first removed and then
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// (re-)added.
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.off('formUpdated.summary')
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.on('formUpdated.summary', function () {
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self.trigger('summaryUpdated');
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})
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// The actual summaryUpdated handler doesn't fire when the callback is
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// changed, so we have to do this manually.
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.trigger('summaryUpdated');
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};
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/**
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* Prevents consecutive form submissions of identical form values.
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*
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* Repetitive form submissions that would submit the identical form values
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* are prevented, unless the form values are different to the previously
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* submitted values.
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*
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* This is a simplified re-implementation of a user-agent behavior that
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* should be natively supported by major web browsers, but at this time, only
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* Firefox has a built-in protection.
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*
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* A form value-based approach ensures that the constraint is triggered for
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* consecutive, identical form submissions only. Compared to that, a form
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* button-based approach would (1) rely on [visible] buttons to exist where
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* technically not required and (2) require more complex state management if
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* there are multiple buttons in a form.
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*
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* This implementation is based on form-level submit events only and relies
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* on jQuery's serialize() method to determine submitted form values. As such,
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* the following limitations exist:
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*
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* - Event handlers on form buttons that preventDefault() do not receive a
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* double-submit protection. That is deemed to be fine, since such button
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* events typically trigger reversible client-side or server-side
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* operations that are local to the context of a form only.
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* - Changed values in advanced form controls, such as file inputs, are not
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* part of the form values being compared between consecutive form submits
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* (due to limitations of jQuery.serialize()). That is deemed to be
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* acceptable, because if the user forgot to attach a file, then the size of
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* HTTP payload will most likely be small enough to be fully passed to the
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* server endpoint within (milli)seconds. If a user mistakenly attached a
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* wrong file and is technically versed enough to cancel the form submission
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* (and HTTP payload) in order to attach a different file, then that
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* edge-case is not supported here.
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*
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* Lastly, all forms submitted via HTTP GET are idempotent by definition of
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* HTTP standards, so excluded in this implementation.
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*
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* @type {Drupal~behavior}
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*/
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Drupal.behaviors.formSingleSubmit = {
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attach: function () {
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function onFormSubmit(e) {
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var $form = $(e.currentTarget);
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var formValues = $form.serialize();
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var previousValues = $form.attr('data-drupal-form-submit-last');
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if (previousValues === formValues) {
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e.preventDefault();
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}
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else {
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$form.attr('data-drupal-form-submit-last', formValues);
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}
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}
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$('body').once('form-single-submit')
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.on('submit.singleSubmit', 'form:not([method~="GET"])', onFormSubmit);
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}
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};
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/**
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* Sends a 'formUpdated' event each time a form element is modified.
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*
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* @param {HTMLElement} element
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*
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* @fires event:formUpdated
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*/
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function triggerFormUpdated(element) {
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$(element).trigger('formUpdated');
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}
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/**
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* Collects the IDs of all form fields in the given form.
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*
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* @param {HTMLFormElement} form
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*
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* @return {Array}
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*/
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function fieldsList(form) {
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var $fieldList = $(form).find('[name]').map(function (index, element) {
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// We use id to avoid name duplicates on radio fields and filter out
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// elements with a name but no id.
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return element.getAttribute('id');
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});
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// Return a true array.
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return $.makeArray($fieldList);
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}
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/**
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* Triggers the 'formUpdated' event on form elements when they are modified.
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*
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* @type {Drupal~behavior}
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*
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* @fires event:formUpdated
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*/
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Drupal.behaviors.formUpdated = {
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attach: function (context) {
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var $context = $(context);
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var contextIsForm = $context.is('form');
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var $forms = (contextIsForm ? $context : $context.find('form')).once('form-updated');
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var formFields;
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if ($forms.length) {
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// Initialize form behaviors, use $.makeArray to be able to use native
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// forEach array method and have the callback parameters in the right
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// order.
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$.makeArray($forms).forEach(function (form) {
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var events = 'change.formUpdated input.formUpdated ';
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var eventHandler = debounce(function (event) { triggerFormUpdated(event.target); }, 300);
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formFields = fieldsList(form).join(',');
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form.setAttribute('data-drupal-form-fields', formFields);
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$(form).on(events, eventHandler);
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});
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}
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// On ajax requests context is the form element.
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if (contextIsForm) {
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formFields = fieldsList(context).join(',');
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// @todo replace with form.getAttribute() when #1979468 is in.
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var currentFields = $(context).attr('data-drupal-form-fields');
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// If there has been a change in the fields or their order, trigger
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// formUpdated.
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if (formFields !== currentFields) {
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triggerFormUpdated(context);
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}
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}
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},
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detach: function (context, settings, trigger) {
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var $context = $(context);
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var contextIsForm = $context.is('form');
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if (trigger === 'unload') {
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var $forms = (contextIsForm ? $context : $context.find('form')).removeOnce('form-updated');
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if ($forms.length) {
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$.makeArray($forms).forEach(function (form) {
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form.removeAttribute('data-drupal-form-fields');
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$(form).off('.formUpdated');
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});
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}
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}
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}
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};
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/**
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* Prepopulate form fields with information from the visitor browser.
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*
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* @type {Drupal~behavior}
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*/
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Drupal.behaviors.fillUserInfoFromBrowser = {
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attach: function (context, settings) {
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var userInfo = ['name', 'mail', 'homepage'];
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var $forms = $('[data-user-info-from-browser]').once('user-info-from-browser');
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if ($forms.length) {
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userInfo.map(function (info) {
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var $element = $forms.find('[name=' + info + ']');
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var browserData = localStorage.getItem('Drupal.visitor.' + info);
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var emptyOrDefault = ($element.val() === '' || ($element.attr('data-drupal-default-value') === $element.val()));
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if ($element.length && emptyOrDefault && browserData) {
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$element.val(browserData);
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}
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});
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}
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$forms.on('submit', function () {
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userInfo.map(function (info) {
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var $element = $forms.find('[name=' + info + ']');
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if ($element.length) {
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localStorage.setItem('Drupal.visitor.' + info, $element.val());
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}
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});
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});
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}
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};
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})(jQuery, Drupal, Drupal.debounce);
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