David's Untitled Life

IE7 has been released

Thu, 19 Oct 2006 14:01:29 +0100

Download here:http://www.microsoft.com/windows/ie/downloads/default.mspx
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Duet:Microsoft and SAP's power

Fri, 12 May 2006 15:04:31 +0100

I got this message from Here.Microsoft and SAP will dev a new product named Duet.This is it's site:http://www.duet.com/
Office will be the Front end as Presentation and SAP will be the Application layer. I thought Office's smart client is a great tech before. Now office and SAP make a perfect bound. Here is the Architech diagram:

Next step of AJAX

Fri, 28 Apr 2006 10:36:49 +0100

Because of focusing on SAP field and busying with a Bank Project,i haven't visit most tech webs such as TSS ajaxian for a long time.But i sitll care the evolution of JAVA world.
Today i found a new word--comet.No, not Halley's comet,yet another buzzword in AJAX world.
It's a approach to improve the interaction of web application after AJAX.The server will hold a connection with client and push message to the client .
More information please visit the related sites:
http://www.irishdev.com/NewsArticle.aspx?id=2166
http://www.irishdev.com/NewsArticle.aspx?id=2173

We still need iframe

Thu, 23 Mar 2006 08:51:26 +0000

I'm implementing upload feature.Javascript can't manipulate file on client machine for security,so i came to iframe firstlly.But i still wonder GMail and microsoft live mail's solution.I found that there were few discussion in domestic ajax forum.But there are many voerseas components.I found all of them use iframe to solve this problem.

So we still need iframe as a approach on AJAX way.

Cool online ruby tutorial

Wed, 22 Mar 2006 07:16:37 +0000

http://tryruby.hobix.com/ Really cool!

Basic Definitions and Concepts of AOP

Tue, 21 Mar 2006 07:07:00 +0000

Concern A particular issue, concept or area of interest for an application. Examples include transaction management, persistence, logging and security.
Crosscutting Concern A concern in which the implementation cuts across many classes. These are often difficult to implement and maintain with OOP.
Aspect The modularization of a crosscutting concern; implemented by gathering and isolating code.
Join Point A point during the execution of a program or class. In Spring's AOP implementation, a join point is always a method invocation. Other examples include accessing fields, where read or write access occurs on an instance variable, and exception handling.
Advice An action taken at a particular join point. Different types of advice in Spring include around, before, throws and after returning. Of these, around is the most powerful, as you get the opportunity to do something before and after a method is invoked. The previous TraceInterceptor used around advice by implementing the AOP Alliance's MethodInterceptor.
Pointcut A set of join points specifying when an advice should fire. Pointcuts often use regular expressions or wildcard syntax.
Introduction Adds fields or methods to an advised class. Spring allows you to introduce new interfaces to any advised object. For example, you could use an introduction to make any object implement an IsModified interface, to simplify caching.
Weaving Assembles aspects to create an advised object. This can be done at compile time (this is how AspectJ does it) or at runtime. The Weaving Strategies section later in this chapter discusses in detail the different strategies for weaving (that is, implementing AOP).
Interceptor An AOP implementation strategy, where a chain of interceptors may exist for a particular join point.
AOP Proxy An object created by the AOP framework, including advice. In Spring, an AOP proxy will be a JDK dynamic proxy or a CGLIB proxy.
Target Object An object containing the join point. In frameworks using interception, it's the object instance at the end of an interceptor chain. Also called an advised or proxied object.

AJAX tool box---Venkman

Mon, 13 Mar 2006 02:05:09 +0000

Venkman is a Javascript Debugger as a FireFox extenstion.It's at least powerful than IE's default script debugger(not Visual InterDev's).You can watch varaiable,set breakpoint and use "step over" "step into" "step out" "continue" buttons to debug your niffy javascript codes.
It's ease to use.And tutorial is HERE:http://www.svendtofte.com/code/learning_venkman/index.php

No more crap about IE Memeory Leak

Sat, 11 Mar 2006 08:39:23 +0000

Two useful liks:
http://jibbering.com/faq/faq_notes/closures.html#clMem
http://javascript.weblogsinc.com/2005/03/07/javascript-memory-leaks/

variable's scope in Javascript

Sat, 11 Mar 2006 08:12:45 +0000

See DFlying's finding:
Yep,No Block Scope concept in JavaScript.Only the global and function Scope.You can use "var" to declare a global variable and use "var" agian to declare a homonymous variable in a function.In the function ,the second one works.But there is no Block scope.
Check the codes below,it's a demo for "NO BLOCK SCOPE"
function test(o) {var i = 0; // i is defined throughout functionif (typeof o == "object") {var j = 0; // j is defined everywhere, not just blockfor(var k = 0; k < 10; k++) { // k is defined everywhere, not just loopdocument.write(k);

}document.write(k); // k is still defined: prints 10}document.write(j); // j is defined, but may not be initialized}

But,You still need to care javascript's FUNCTION SCOPE.Also see code snippet:
var scope = "global";

function f( ) {alert(scope); // Displays "undefined", not "global"var scope = "local"; // Variable initialized here, but defined everywherealert(scope); // Displays "local"}f( );
Right,thought you alert(scope) first and then define a new functin scope variable scope.However,once you define a function scope vriable,it will hide the global variable in the function body,whatever the definition order.

AJAX Auto-complete component

Wed, 08 Mar 2006 02:54:13 +0000

本来还要自己写一个auto-complete，但是大多数此类功能并没有提供类似google suggest提供的键盘选择功能，auto-complete便失去了一大半的交互改善。于是前两天还特意扒了google suggest来看ac.js 发现google定是用了混淆器。虽然代码没有压缩，但是代码的回车空行和函数名字全部混乱。正在要自己写的时候发现了此中国自产的AutoAssist。Very Cool!

AutoAssist is an auto completion web widget that written in pure JavaScript. It can help enhance the accessibility of existing website, let the users to work effective and feel comfortable. AutoAssist Javascript only and is built upon prototype and rico. Its main features are :

* improve the User Experience
* Don't require an Ajax experience
* pretty managed JavaScript, easy to understand and customize
* works well on Mozilla/FireFox, IE and Opera
* have a nice solution for fast user typing, reduce a lot of corresponding server loading (20% - 80% *)

The code for the screenshot is very simple :

var foo = function() {
    var tt = new AutoAssist("t", {setRequestOptions: function() {
            var pars = "name=" + this.txtBox.value;
            return { url: "/country.php", parameters: pars };
        }});
}
Event.observe(window, "load", foo);

You can find a ten minutes tutorial for AutoAssist explaining in details how to use this script to create an auto-complete list based on country data.

By the way,script.aculo.us also has it's impelmention:http://demo.script.aculo.us/ajax/autocompleter