Update information script

Signed-off-by: Valentin Popov <info@valentineus.link>

assets/javascript/scriptx.js

@@ -0,0 +1,52 @@
+'use strict';
+
+/**
+ * @param {String} artistTrack - Artist of the track
+ * @param {String} titleTrack - Name of the track
+ * @description Updates the data on the page. Displays a pop-up window if the
+ * data has changed.
+ */
+function updateData(artistTrack, titleTrack) {
+  /* Gets items on the page */
+  var displayElement = document.getElementById('display');
+  var artistElement = document.getElementById('artist');
+  var titleElement = document.getElementById('title');
+
+  if (artistElement.innerHTML !== artistTrack || titleElement.innerHTML !== titleTrack) {
+    /* Updates text */
+    artistElement.innerHTML = artistTrack;
+    titleElement.innerHTML = titleTrack;
+
+    /* Displays a pop-up window */
+    displayElement.style['animation-name'] = 'fadeIn';
+
+    setTimeout(function () {
+      /* Removes a pop-up window */
+      displayElement.style['animation-name'] = 'fadeOut';
+    }, 3000);
+  }
+}
+
+var client = new XMLHttpRequest();
+var url = 'https://somafm.com/songs/defcon.xml';
+
+/* Processes response */
+client.onload = function () {
+  if (client.readyState === client.DONE) {
+    if (this.status === 200 && this.responseXML !== null) {
+      /* Gets current track */
+      var current = this.responseXML.getElementsByTagName('song')[0];
+      var artist = current.getElementsByTagName('artist')[0].textContent;
+      var title = current.getElementsByTagName('title')[0].textContent;
+
+      /* Updates data */
+      updateData(artist, title);
+    }
+  }
+};
+
+/* Update cycle */
+setInterval(function () {
+  client.open('GET', url);
+  client.send();
+}, 5000);