Lowyat.NET: Latest topics by Cannibal

Exchange 3rd gen iPad adapter

Cannibal — Fri, 04 May 2012 14:36:33 +0800

as title, anyone interested please pm me. thanks.

About Intel S5520SC Serverboard

Cannibal — Wed, 11 Jan 2012 11:58:26 +0800

I am wondering can this motherboard fit into normal ATX case?

[addedon]January 11, 2012, 12:05 pm[/addedon]I am about to build a 8 core PC with budget ~6k. Any recommendation? Current plan:

Intel S5520SC - RM1500
Intel i7-960 x2 - RM1730
Intel SSD 120GB x2 - RM1800
Kingston DDR3 4GB x2 - RM136
Winfast Quadro FX580 512MB - RM899

SQL help

Cannibal — Mon, 25 Apr 2011 12:07:17 +0800

Let me describe a scenario. I have 3 doors (door1, door2 and door3), and a table recording the activities of 3 doors. Every time a door is open/close, a new record will be insert into the table with time stamp. Format of the table is something like below:

Time, Door, State
2011-01-01 01:01:00, 1, close
2011-01-01 01:00:00, 3, close
2011-01-01 00:00:00, 1, open
2011-01-01 00:00:00, 2, close
2011-01-01 00:00:00, 3, open

Now the question is, how do I make a query that will return last activity of each door, order by time desc? So it will return:

Time, Door, State
2011-01-01 01:01:00, 1, close
2011-01-01 01:00:00, 3, close
2011-01-01 00:00:00, 2, close

Any suggestion will be appreciated. Thanks.

Accessing function in parent window from iframe

Cannibal — Tue, 29 Mar 2011 12:24:07 +0800

In short, I am having problem checking constructor of an argument from iframe. The received argument from iframe is known as Object but yet does not pass obj.constructor == Object. Whoever is interested, please create 2 HTML file (say main.htm and iframe.htm) and paste the following code.

main.htm:

CODE

<!DOCTYPE HTML>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Iframe test</title>
<meta http-equiv="expires" content="-1" />
</head>
<body>
<iframe frameborder="0" style="height: 50%; width: 100%; position: fixed; bottom: 0" src="iframe.htm"></iframe>
</body>
<script type="text/javascript">
function foo(arg) {
if (arg.constructor == Object) {
alert('This is an Object');
}
else if (arg.constructor == String) {
alert('This is a String');
}
else {
alert('I don\'t know what is this');
}
}
</script>
</html>

iframe.htm:

CODE

<!DOCTYPE HTML>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Iframe test</title>
<meta http-equiv="expires" content="-1" />
</head>
<body>
<div style="width: 50%; float: left;">
<div>
<p>var obj = {};</p>
<p>top.foo(obj);</p>
<input type="button" value="Run top" onclick="top.foo({});" />
</div>
<div>
<p>var obj = "";</p>
<p>top.foo(obj);</p>
<input type="button" value="Run top" onclick="top.foo('');" />
</div>
</div>
<div style="width: 50%; float: left;">
<div>
<p>var obj = {};</p>
<p>foo(obj);</p>
<input type="button" value="Run here" onclick="foo({});" />
</div>
<div>
<p>var obj = "";</p>
<p>foo(obj);</p>
<input type="button" value="Run here" onclick="foo('');" />
</div>
</div>
</body>
<script type="text/javascript">
function foo(arg) {
if (arg.constructor == Object) {
alert('This is an Object');
}
else if (arg.constructor == String) {
alert('This is a String');
}
else {
alert('I don\'t know what is this');
}
}
</script>
</html>

typeof works but I don't like it.

[addedon]March 29, 2011, 2:51 pm[/addedon]manage to find solution by myself. it was mentioned back in 2003.

http://perfectionkills.com/instanceof-cons...robust-isarray/

solution is, write your own object prototype or use jQuery.isPlainObject(obj) to check.

SVG matrix in IE9

Cannibal — Tue, 22 Mar 2011 12:56:55 +0800

the following is a sample SVG file:

CODE

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg">

<rect
id="rect2605"
width="300"
height="100"
style="fill:rgb(0,0,255);stroke-width:1;stroke:rgb(0,0,0)"
transform="matrix(1,-1,1,1,0,0)" />

</svg>

the following is a test page:

CODE

<!DOCTYPE HTML>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>IE 9 SVG test</title>
</head>
<body>
<embed id='svgembed' type='image/svg+xml' src="test.svg"></embed>
</body>
<script type='text/javascript'>
setTimeout( function() {
var svgdoc = document.getElementById('svgembed').getSVGDocument()
var rect = svgdoc.getElementById('rect2605');
alert(rect.getAttribute( "transform"));
}, 1000);
</script>
</html>

in standard browser, the alert will show exactly what is written in the SVG transform attribute, that is, matrix(1,-1,1,1,0,0). in IE9, it returns matrix(1 -1 1 1 0 0). replaced coma with white space. this has caused my regex to fail. anyone can confirm this is a bug?

Best joke of the year

Cannibal — Thu, 03 Jul 2008 18:30:37 +0800

一小学老师在和学生解释"乳"字的含义：乳即是小的意思，比如乳鸽、乳猪等，要求小明用乳字造句。

小明：因为现在房价太高了，所以我家只能买得起50平方米的乳房

老师汗,说: 再造一个

小明: 我年纪太小,连一米宽的乳沟都跳不过去

老师大汗,说 : 再造一个

小明：老师我真的想不出来了，我的乳头都快想破了