1 files changed, 74 insertions, 0 deletions
diff --git a/assets/javascript/script.js b/assets/javascript/script.js
new file mode 100644
index 0000000..6eaf1a6
--- /dev/null
+++ b/assets/javascript/script.js
@@ -0,0 +1,74 @@
+'use strict';
+
+/**
+ * @param {String} parameterName - Variable name
+ * @returns {String} Value of variable
+ * @description Searches for the value of the GET variable on the page.
+ */
+function findGetParameter(parameterName) {
+  var result = null;
+  var tmp = [];
+
+  var items = window.location.search.substr(1).split('&');
+  for (var index = 0; index < items.length; index++) {
+    tmp = items[index].split('=');
+    if (tmp[0] === parameterName) {
+      result = decodeURIComponent(tmp[1]);
+    }
+  }
+
+  return result;
+}
+
+/**
+ * @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.textContent !== artistTrack || titleElement.textContent !== titleTrack) {
+    /* Updates text */
+    document.title = artistTrack + ' - ' + titleTrack;
+    artistElement.textContent = artistTrack;
+    titleElement.textContent = titleTrack;
+
+    /* Displays a pop-up window */
+    displayElement.style['animation-name'] = 'fadeIn';
+
+    setTimeout(function () {
+      /* Removes a pop-up window */
+      displayElement.style['animation-name'] = 'fadeOut';
+    }, 10000);
+  }
+}
+
+var client = new XMLHttpRequest();
+var radio = findGetParameter('radio');
+var url = '//somafm.com/songs/' + radio + '.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();
+}, 15000);