104 lines
4.6 KiB
JavaScript
104 lines
4.6 KiB
JavaScript
/**
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* @copyright (C) 2020 Open Source Matters, Inc. <https://www.joomla.org>
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* @license GNU General Public License version 2 or later; see LICENSE.txt
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*/
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/**
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* Add a keyboard event listener to the Select a Module Type search element.
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*
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* IMPORTANT! This script is meant to be loaded deferred. This means that a. it's non-blocking
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* (the browser can load it whenever) and b. it doesn't need an on DOMContentLoaded event handler
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* because the browser is guaranteed to execute it only after the DOM content has loaded, the
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* whole point of it being deferred.
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*
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* The search box has a keyboard handler that fires every time you press a keyboard button or send
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* a keypress with a touch / virtual keyboard. We then iterate all module type cards and check if
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* the plain text (HTML stripped out) representation of the module title or description partially
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* matches the text you entered in the search box. If it doesn't we add a Bootstrap class to hide
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* the module.
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*
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* This way we limit the displayed modules only to those searched.
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*
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* This feature follows progressive enhancement. The search box is hidden by default and only
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* displayed when this JavaScript here executes. Furthermore, session storage is only used if it
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* is available in the browser. That's a bit of a pain but makes sure things won't break in older
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* browsers.
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*
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* Furthermore and to facilitate the user experience we auto-focus the search element which has a
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* suitable title so that non-sighted users are not startled. This way we address both UX concerns
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* and accessibility.
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*
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* Finally, the search string is saved into session storage on the assumption that the user is
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* probably going to be creating multiple instances of the same module, one after another, as is
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* typical when building a new Joomla! site.
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*/
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// Make sure the element exists i.e. a template override has not removed it.
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const elSearch = document.getElementById('comModulesSelectSearch');
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const elSearchContainer = document.getElementById('comModulesSelectSearchContainer');
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const elSearchHeader = document.getElementById('comModulesSelectTypeHeader');
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const elSearchResults = document.getElementById('comModulesSelectResultsContainer');
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const alertElement = document.querySelector('.modules-alert');
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const elCards = [].slice.call(document.querySelectorAll('.comModulesSelectCard'));
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if (elSearch && elSearchContainer) {
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// Add the keyboard event listener which performs the live search in the cards
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elSearch.addEventListener('keyup', event => {
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/** @type {KeyboardEvent} event */
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const partialSearch = event.target.value;
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let hasSearchResults = false;
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// Save the search string into session storage
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if (typeof sessionStorage !== 'undefined') {
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sessionStorage.setItem('Joomla.com_modules.new.search', partialSearch);
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}
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// Iterate all the module cards
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elCards.forEach(card => {
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// First remove the class which hide the module cards
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card.classList.remove('d-none');
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// An empty search string means that we should show everything
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if (!partialSearch) {
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return;
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}
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const cardHeader = card.querySelector('.new-module-title');
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const cardBody = card.querySelector('.new-module-caption');
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const title = cardHeader ? cardHeader.textContent : '';
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const description = cardBody ? cardBody.textContent : '';
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// If the module title and description don’t match add a class to hide it.
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if (title && !title.toLowerCase().includes(partialSearch.toLowerCase()) && description && !description.toLowerCase().includes(partialSearch.toLowerCase())) {
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card.classList.add('d-none');
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} else {
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hasSearchResults = true;
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}
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});
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if (hasSearchResults || !partialSearch) {
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alertElement.classList.add('d-none');
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elSearchHeader.classList.remove('d-none');
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elSearchResults.classList.remove('d-none');
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} else {
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alertElement.classList.remove('d-none');
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elSearchHeader.classList.add('d-none');
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elSearchResults.classList.add('d-none');
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}
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});
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// For reasons of progressive enhancement the search box is hidden by default.
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elSearchContainer.classList.remove('d-none');
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// Focus the just show element
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elSearch.focus();
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try {
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if (typeof sessionStorage !== 'undefined') {
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// Load the search string from session storage
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elSearch.value = sessionStorage.getItem('Joomla.com_modules.new.search') || '';
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// Trigger the keyboard handler event manually to initiate the search
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elSearch.dispatchEvent(new KeyboardEvent('keyup'));
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}
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} catch (e) {
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// This is probably Internet Explorer which doesn't support the KeyboardEvent constructor :(
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}
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}
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