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proxy.html
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proxy.html
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<!doctype html>
<html lang="en">
<head>
<title>JavaScript Patterns</title>
<meta charset="utf-8">
<style>
img {
float: left;
padding-right: 7px;
}
div {
padding: 7px;
border: 1px solid #ccc;
background: #eee;
width: 400px;
}
h2 {
margin: 0;
}
span {
text-decoration: underline;
cursor: pointer;
}
body {
padding: 21px;
font-size: 105%;
font-family: Helvetica;
}
input {
margin-right: 7px;
}
a {
color: blue;
}
</style>
</head>
<body>
<h1>Dave Matthews vids</h1>
<p><span id="toggle-all">Toggle Checked</span></p>
<ol id="vids">
<li><input type="checkbox" checked><a href="http://new.music.yahoo.com/videos/--2158073">Gravedigger</a></li>
<li><input type="checkbox" checked><a href="http://new.music.yahoo.com/videos/--4472739">Save Me</a></li>
<li><input type="checkbox" checked><a href="http://new.music.yahoo.com/videos/--45286339">Crush</a></li>
<li><input type="checkbox" checked><a href="http://new.music.yahoo.com/videos/--2144530">Don't Drink The
Water</a></li>
<li><input type="checkbox" checked><a href="http://new.music.yahoo.com/videos/--217241800">Funny the Way It
Is</a></li>
<li><input type="checkbox" checked><a href="http://new.music.yahoo.com/videos/--2144532">What Would You Say</a>
</li>
</ol>
<script>
/* Title: Proxy
Description: provides a placeholder for another object to control access, reduce cost, and reduce complexity
*/
var $ = function (id) {
return document.getElementById(id);
};
var http = {
makeRequest:function (ids, callback) {
var url = 'http://query.yahooapis.com/v1/public/yql?q=',
sql = 'select * from music.video.id where ids IN ("%ID%")',
format = "format=json",
handler = "callback=" + callback,
script = document.createElement('script');
sql = sql.replace('%ID%', ids.join('","'));
sql = encodeURIComponent(sql);
url += sql + '&' + format + '&' + handler;
script.src = url;
document.body.appendChild(script);
}
};
var proxy = {
ids:[],
delay:50,
timeout:null,
callback:null,
context:null,
makeRequest:function (id, callback, context) {
// add to the queue
this.ids.push(id);
this.callback = callback;
this.context = context;
// set up timeout
if (!this.timeout) {
this.timeout = setTimeout(function () {
proxy.flush();
}, this.delay);
}
},
flush:function () {
http.makeRequest(this.ids, 'proxy.handler');
// clear timeout and queue
this.timeout = null;
this.ids = [];
},
handler:function (data) {
var i, max;
// single video
if (parseInt(data.query.count, 10) === 1) {
proxy.callback.call(proxy.context, data.query.results.Video);
return;
}
// multiple videos
for (i = 0, max = data.query.results.Video.length; i < max; i += 1) {
proxy.callback.call(proxy.context, data.query.results.Video[i]);
}
}
};
var videos = {
getPlayer:function (id) {
return '' +
'<object width="400" height="255" id="uvp_fop" allowFullScreen="true">' +
'<param name="movie" value="http://d.yimg.com/m/up/fop/embedflv/swf/fop.swf"\/>' +
'<param name="flashVars" value="id=v' + id + '&eID=1301797&lang=us&enableFullScreen=0&shareEnable=1"\/>' +
'<param name="wmode" value="transparent"\/>' +
'<embed ' +
'height="255" ' +
'width="400" ' +
'id="uvp_fop" ' +
'allowFullScreen="true" ' +
'src="http://d.yimg.com/m/up/fop/embedflv/swf/fop.swf" ' +
'type="application/x-shockwave-flash" ' +
'flashvars="id=v' + id + '&eID=1301797&lang=us&ympsc=4195329&enableFullScreen=1&shareEnable=1"' +
'\/>' +
'<\/object>';
},
updateList:function (data) {
var id,
html = '',
info;
if (data.query) {
data = data.query.results.Video;
}
id = data.id;
html += '<img src="' + data.Image[0].url + '" width="50" \/>';
html += '<h2>' + data.title + '<\/h2>';
html += '<p>' + data.copyrightYear + ', ' + data.label + '<\/p>';
if (data.Album) {
html += '<p>Album: ' + data.Album.Release.title + ', ' + data.Album.Release.releaseYear + '<br \/>';
}
html += '<p><a class="play" href="http://new.music.yahoo.com/videos/--' + id + '">» play<\/a><\/p>';
info = document.createElement('div');
info.id = "info" + id;
info.innerHTML = html;
$('v' + id).appendChild(info);
},
getInfo:function (id) {
var info = $('info' + id);
if (!info) {
proxy.makeRequest(id, videos.updateList, videos);
return;
}
if (info.style.display === "none") {
info.style.display = '';
} else {
info.style.display = 'none';
}
}
};
$('vids').onclick = function (e) {
var src, id;
e = e || window.event;
src = e.target || e.srcElement;
if (src.nodeName.toUpperCase() !== "A") {
return;
}
if (typeof e.preventDefault === "function") {
e.preventDefault();
}
e.returnValue = false;
id = src.href.split('--')[1];
if (src.className === "play") {
src.parentNode.innerHTML = videos.getPlayer(id);
return;
}
src.parentNode.id = "v" + id;
videos.getInfo(id);
};
$('toggle-all').onclick = function (e) {
var hrefs,
i,
max,
id;
hrefs = $('vids').getElementsByTagName('a');
for (i = 0, max = hrefs.length; i < max; i += 1) {
// skip play links
if (hrefs[i].className === "play") {
continue;
}
// skip unchecked
if (!hrefs[i].parentNode.firstChild.checked) {
continue;
}
id = hrefs[i].href.split('--')[1];
hrefs[i].parentNode.id = "v" + id;
videos.getInfo(id);
}
};
// reference
// http://www.addyosmani.com/resources/essentialjsdesignpatterns/book/#proxypatternjquery
// http://shop.oreilly.com/product/9780596806767.do?sortby=publicationDate
</script>
</body>
</html>