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jQuery.html5Loader

Html 5 มีความสามารถในการแสดง video และ audio เพิ่มขิ้นมา ดังนั้น preload ในครั้งที่แล้ว ซึ่งช่วยโหลดรูปมาเก็บไว้เท่านั้นอาจจะไม่เพียงพอ เพราะไฟล์วิดีโอใหญ่ ๆ หรือไฟล์เพลงยังโหลดมาไม่ครบ การแสดงผลออกมาจึงไม่สมบูรณ์ตามที่ออกแบบไว้ได้ เครื่องมือที่แนะนำวันนี้คือ jQuery.html5Loader โหลดได้ที่ gianlucaguarini http://www.gianlucaguarini.com/
demo.html[code language=”html”]

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>preload jQuery.html5loader</title>
<style>
#preload {
background: #000;
height: 99%;
opacity: 0.5;
width: 99%;
z-index: 100;
}
</style>
</head>

<body>
<div id="preload"></div>
<script src="assets/jQuery/jquery.min.js"></script>
<script src="assets/jquery/jQuery.html5loader/js/animations/jQuery.html5Loader.circular.js"></script>
<script src="assets/jQuery/jQuery.html5loader/js/jQuery.html5Loader.min.js"></script>
<script>
var images ={};
var loaderAnimation = $(‘#preload’).LoaderAnimation({
glowColor:"#f0f0f0",
lineWidth:10,
color:"#cccccc"
});
$.html5Loader({
getFilesToLoadJSON:’preloadHtml5loader.json’,
onComplete:function()
{
alert(‘onComplete’);
$(‘#preload’).remove();
},
onUpdate: loaderAnimation.update
});
</script>
</body>
</html>
[/code]
โดย JavaScript จะอ่านข้อมูลที่ต้องโหลดมาจากข้อมูล json ในไฟล์ preloadHtml5loader.json ผมทำไฟล์ PHP ช่วย generate ไว้ให้แล้ว
generator.php
[code language=”html”]
<?php
/*
http://php.net/manual/en/function.readdir.php
Xhtml.co.il 01-Jun-2011 02:31
*/

/*
http://en.wikipedia.org/wiki/Internet_media_type#List_of_common_media_types
http://diveintohtml5.info/video.html
http://en.wikipedia.org/wiki/HTML5_video#Supported_video_formats
*/

$extensionType[‘AUDIO’] = array(‘aiff’, ‘au’, ‘flac’, ‘l16’, ‘m4a’, ‘m4b’, ‘m4p’, ‘m4rand’, ‘m4v’, ‘mp3’, ‘oga’, ‘ogg’, ‘ogv’, ‘ogx’, ‘opus’, ‘pcm’, ‘ra’, ‘ram’, ‘spx’, ‘wav’, ‘wave’, ‘webm’);
$extensionType[‘IMAGE’] = array(‘gif’, ‘ico’, ‘jfi’, ‘jfif’, ‘jif’, ‘jpe’, ‘jpeg’, ‘jpg’, ‘png’, ‘svg’, ‘svgz’, ‘tif’, ‘tiff’);
$extensionType[‘SCRIPT’] = array(‘js’, ‘json’);
$extensionType[‘TEXT’] = array(‘css’, ‘csv’, ‘htm’, ‘html’, ‘txt’, ‘xml’);
$extensionType[‘VIDEO’] = array(‘aac’, ‘dv’, ‘f4a’, ‘f4b’, ‘f4p’, ‘f4v’, ‘flv’, ‘m1a’, ‘m1v’, ‘m2a’, ‘m4a’, ‘m4b’, ‘m4p’, ‘m4r’, ‘m4v’, ‘mk3d’, ‘mka’, ‘mks’, ‘mkv’, ‘mov’, ‘mp1’, ‘mp2’, ‘mp4’, ‘mpa’, ‘mpeg’, ‘mpg’, ‘mpv’, ‘oga’, ‘ogv’, ‘ogx’, ‘opus’, ‘qt’, ‘spx’, ‘wav’, ‘wmv’);

function ReadFolderDirectory($dir = ‘assets/products’, $extensionType, $files)
{
$multiple = array();
if($handler = opendir($dir))
{
$dirs = array();
while (($sub = readdir($handler)) !== FALSE)
{
$item = array();
if ($sub != "." && $sub != ".." && $sub != "Thumb.db" && $sub != "Thumbs.db")
{
if(is_file($dir."/".$sub))
{
$pathParts = pathinfo($sub);
$item[‘type’] = ”;
foreach($extensionType as $group => $type)
{
$ext = strtolower($pathParts[‘extension’]);
if(array_search($ext, $type) !== FALSE)
{
$item[‘type’] = $group;
continue;
}
}
if($item[‘type’] == ‘AUDIO’ || $item[‘type’] == ‘VIDEO’)
{
$multiple[$item[‘type’]][$pathParts[‘filename’]][$ext][‘size’] = filesize($dir."/".$sub);
$multiple[$item[‘type’]][$pathParts[‘filename’]][$ext][‘source’] = $dir.’/’.$sub;
}
else
{
$item[‘size’] = filesize($dir."/".$sub);
$item[‘source’] = $dir.’/’.$sub;
$files[] = $item;
}
}
else
{
$files = ReadFolderDirectory($dir."/".$sub, $extensionType, $files);
}
}
}
closedir($handler);
foreach($multiple as $type => $filenames)
{
$group = array();
$group[‘type’] = $type;
foreach($filenames as $filename => $exts)
{
foreach($exts as $ext => $info)
{
$group[‘sources’][$ext][‘size’] = $info[‘size’];
$group[‘sources’][$ext][‘source’] = $info[‘source’];
}
}
$files[] = $group;
}
}
return $files;
}

$files = array();
$files[‘files’] = ReadFolderDirectory(‘assets/products/items’, $extensionType, $files);
//echo ‘<pre>’,print_r($lists, true),'</pre>’;
header(‘Content-type: application/json; charset=utf-8’);
echo json_encode($files);
[/code]
Effect ที่มีสามารถเปลี่ยนได้โดยการเปลี่ยนไปเรียกไฟล์ javascript อื่นๆ ใน assets/jquery/jQuery.html5loader/js/animations แทน

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