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media/plg_quickicon_extensionupdate/js/extensionupdatecheck.js

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+/**
+ * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+(() => {
+
+  // Ajax call to get the update status of the installed extensions
+  const fetchUpdate = () => {
+    if (Joomla.getOptions('js-extensions-update')) {
+      const options = Joomla.getOptions('js-extensions-update');
+      const update = (type, text) => {
+        const link = document.getElementById('plg_quickicon_extensionupdate');
+        const linkSpans = [].slice.call(link.querySelectorAll('span.j-links-link'));
+        if (link) {
+          link.classList.add(type);
+        }
+        if (linkSpans.length) {
+          linkSpans.forEach(span => {
+            span.innerHTML = Joomla.sanitizeHtml(text);
+          });
+        }
+      };
+
+      /**
+       * DO NOT use fetch() for QuickIcon requests. They must be queued.
+       *
+       * @see https://github.com/joomla/joomla-cms/issues/38001
+       */
+      Joomla.enqueueRequest({
+        url: options.ajaxUrl,
+        method: 'GET',
+        promise: true
+      }).then(xhr => {
+        const response = xhr.responseText;
+        const updateInfoList = JSON.parse(response);
+        if (Array.isArray(updateInfoList)) {
+          if (updateInfoList.length === 0) {
+            // No updates
+            update('success', Joomla.Text._('PLG_QUICKICON_EXTENSIONUPDATE_UPTODATE'));
+          } else {
+            update('danger', Joomla.Text._('PLG_QUICKICON_EXTENSIONUPDATE_UPDATEFOUND').replace('%s', `<span class="badge text-dark bg-light">${updateInfoList.length}</span>`));
+          }
+        } else {
+          // An error occurred
+          update('danger', Joomla.Text._('PLG_QUICKICON_EXTENSIONUPDATE_ERROR'));
+        }
+      }).catch(() => {
+        // An error occurred
+        update('danger', Joomla.Text._('PLG_QUICKICON_EXTENSIONUPDATE_ERROR'));
+      });
+    }
+  };
+
+  // Give some times to the layout and other scripts to settle their stuff
+  window.addEventListener('load', () => {
+    setTimeout(fetchUpdate, 330);
+  });
+})();

media/plg_quickicon_extensionupdate/js/extensionupdatecheck.min.js

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+(()=>{const e=()=>{if(Joomla.getOptions("js-extensions-update")){const e=Joomla.getOptions("js-extensions-update"),t=(e,t)=>{const s=document.getElementById("plg_quickicon_extensionupdate"),n=[].slice.call(s.querySelectorAll("span.j-links-link"));s&&s.classList.add(e),n.length&&n.forEach((e=>{e.innerHTML=Joomla.sanitizeHtml(t)}))};Joomla.enqueueRequest({url:e.ajaxUrl,method:"GET",promise:!0}).then((e=>{const s=e.responseText,n=JSON.parse(s);Array.isArray(n)?0===n.length?t("success",Joomla.Text._("PLG_QUICKICON_EXTENSIONUPDATE_UPTODATE")):t("danger",Joomla.Text._("PLG_QUICKICON_EXTENSIONUPDATE_UPDATEFOUND").replace("%s",`<span class="badge text-dark bg-light">${n.length}</span>`)):t("danger",Joomla.Text._("PLG_QUICKICON_EXTENSIONUPDATE_ERROR"))})).catch((()=>{t("danger",Joomla.Text._("PLG_QUICKICON_EXTENSIONUPDATE_ERROR"))}))}};window.addEventListener("load",(()=>{setTimeout(e,330)}))})();