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