Month: August 2008

Check username availability via AJAX with jQuery

HTML Checking… JavaScript $(“#loading”).hide(); var orig=$(“#loading”).html(); $(“#UserNameInputID”).blur(function() { $(“#loading”).html(orig); $(“#loading”).show(); loadTextPage(“loading”,”check.php?username=”+$(“#UserNameInputID”).val()); }); /** load a text page into this div */ function loadTextPage($pDivID,$pURL) { $.ajax({ url:$pURL, dataType:’html’, success:function (txt) { $(‘#’+$pDivID).html(txt); } }); Server-side check.php

August 28, 2008
jQuery odd/even selector bug?

For some reason I have not been able to identify and test, this code would not work (show the same color or same color for subsequent rows, does not seem to have a pattern): $(“#tableid tbody tr:even”).addClass(“even”); $(“#tableid tbody tr:odd”).addClass(“odd”); But this does work: $(“#tableid tbody tr:nth-child(even)”).addClass(“even”); $(“#tableid tbody tr:nth-child(odd)”).addClass(“odd”); Any thought?

August 23, 2008
jQuery eq() typical mistake

With all the open/close quote, you might write this code: var i = 123; $(“:checkbox:eq(i)”).removeAttr(“disabled”); Since the selector string is within the quotes, the correct statement should be: $(“:checkbox:eq(“+i+”)”).removeAttr(“disabled”);

August 22, 2008
vmstat – Get an overview look at your server

Get an update every one second [root@s14 trungson]# vmstat 1 procs ———–memory———- —swap– —–io—- –system– —-cpu—- r b swpd free buff cache si so bi bo in cs us sy id wa 3 0 41200 33324 2152 1489108 0 0 4 27 0 1 5 3 91 0 2 0 41200 33500 2152 1489108 0…

August 21, 2008
Duplicate value under Binlog_Do_DB

If you see Binlog_Do_DB show duplicate values and you mention them only once in my.cnf. For example: db1,db2,db1,db2. You would suspect that something is reading your my.cnf twice. That would be correct as it’s a MySQL bug #20748

August 17, 2008
Some Hack Script

After my fare share of performing security audit, these are some hacking script I found, not for the purpose of hacking, but for education, analysis and prevention. function ConvertBytes($number) { $len = strlen($number); if($len < 4) { return sprintf("%d b", $number); } if($len >= 4 && $len = 7 && $len

August 15, 2008
Use ethtool or mii-tool to detect problems with ethernet card

[root@s2 adserver]# ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Full Advertised auto-negotiation: Yes Speed: Unknown! (0) Duplex: Half Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on Supports Wake-on: pumbg Wake-on: g Current message level: 0x00000033 (51) Link…

August 13, 2008
Ad Server with AJAX

Normally, JavaScript document.write is used by ad servers to write the ad code directly into the page (AdSense, AdSpeed, OpenX, etc.) To reload ads automatically without a page reload, we use AJAX with JSONP (JSON with padding). Partial content reloading uses DOM to update the content. jQuery 1.2.x has this built-in, or you can write…

August 6, 2008