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'use strict';
var client = new XMLHttpRequest();
var channel = findGetParameter('channel');
var duration = getInterval('duration');
var interval = getInterval('interval');
/**
* @function
* @description Processes the incoming packet.
*/
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 artistTrack = current.getElementsByTagName('artist')[0].textContent;
var titleTrack = current.getElementsByTagName('title')[0].textContent;
/* 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 */
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';
}, duration);
}
}
}
};
/**
* @function
* @description Cyclical sending a request to update the information.
*/
setInterval(function tick() {
client.open('GET', '//somafm.com/songs/' + channel + '.xml');
client.send();
return tick;
}(), interval);
/**
* @function
* @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;
}
/**
* @function
* @param {String} parameterName - Variable name
* @returns {Number} Timer value, default 10 seconds
* @description Gets the settings for the specified timer.
*/
function getInterval(parameterName) {
var value = findGetParameter(parameterName);
var interval = parseInt(value, 10);
var result = 10000;
if (isNaN(interval) === false) {
result = interval;
}
return result;
}
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