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  A simple example of drawing bar chart with label using d3.js

D3.js is a very popular graph library to help developers draw various kind of charts using JavaScript in a webpage. It utilizes the SVG format supported by all major modern browsers and can help developers get rid of the old age of Flash or server side graph drawing libraries. In this post, we will introduce some simple examples of drawing bar chart with labels using D3.js.  First, let's see what will be the final look of the graph drawn. Below is the complete source code for this example....

   JAVASCIPT,D3,BAR CHART,LABEL,TUTORIAL     2020-05-16 23:25:40

  10 modern technologies we will still use in 2030

Although there is rapid revolution for new technology, some technologies can survive with the passage of time. Here are 10 modern technologies which may continue to exist in 2030. 1. QWERTY keyboard Speech recognition, handwriting recognition and gesture control input will become the trend for the next two decades. Nonetheless QWERTY keyboard input is still one of the most accurate way - although not necessarily the most convenient. Although physical keyboard disappear on phones and tablet PCs, ...

   New technology,Trend     2012-11-12 11:02:02

  Why cannot Renren be China's Facebook?

Yizhou Chen, CEO of China's SNS community Renren, shouted "one war, three battles". We do not know now how the battle progresses. Currently Renren's net market value is $1.3 billion where 900 million of them are in cash, it means the market values Renren 400 million US dollars only which is far lower than Facebook. Why cannot Renren be China's Facebook? This is a very interesting topic, many users share their opinions, Some of the main points are summarized as follows:Facebook pay more attentio...

   Renren, Facebook,SNS     2012-11-22 11:44:33

  30 minutes to fix Java vulnerability

On September 25, Adam Gowdiak from the Polish security consulting firm Security Explorations submitted a Java security vulnerability to Oracle and provided a proof-of-concept. The vulnerability exists in Java 5 6,7, once the user accesses hosted malware site, an attacker can remotely control the infected machine.Gowdiak later got in touch again with Oracle and got the response that the fix has reached the final stage. He can expect the patch in four months later. He eventually unbearable Oracle'...

   Java, Vulnerability,Fix     2012-10-29 11:53:43

  Speech balloon with pure CSS--One step further

Many of us want to add cool features to our websites to make our websites user friendly ad more attractive. Especially in Web2.0 era. Today we are talking about adding speech balloon feature to our webpage so that we can display beautiful help windows while users mouse over some help icons on our page. First, let me introduce one post written by Umar Ashfaq named "How to create a speech balloon with pure CSS". He also explains how this works. You can also refer Magic CSS shape for more informati...

   Speech balloon, Pure CSS,border     2013-03-16 04:11:58

  China's search engine war becomes tough

According to CNZZ, the new search engine market share report for August shows that the war of search engine is becoming tough in China. In August, four major players took almost all the search engine market share.  Among these four, Baidu still tops the market share with 63.16 percent, but it experienced a 1.09 percent drop compared to July. In contrast, its main competitor Qihoo continued to inch upwards, Qihoo's market share increased by around one percent compared to July. In the third ...

   CNZZ,Search engine,Baidu     2013-09-17 02:46:02

  new expression vs operator new in C++

In C++, there is a new mechanism for memory allocation and management. When we want to initialize an object, we can use new expression to get enough memory for storing an object and also initialize the object. When we want to create a new object, we can use new expression, for example: Obj *obj=new Obj; Basically, what the new expression does is to allocate enough memory for storing the obj object, in addition, it will initialize the object with some intial values. Also, there is an operator new...

   C++, new expression, operator new     2012-08-12 11:42:39

  10 tools to make your shell script more powerful

Many people mistakenly think that shell scripts can only be run in command line. In fact shell can also call some GUI components such as menus,alert dialogs, progress bar etc. You can control the final output, cursor position and various output effects. Here we introduce some tools which can help you create powerful, interactive and user friendly Unix/Linux shell scripts. 1. notify-send This command can let you inform the process to send a desktop notification to users. This can be used to send ...

   shell,GUI,zenity     2013-04-05 08:50:41

  Samsung will build its own mobile browser

According to the Korean IT News, Samsung is developing its own brand mobile browser based on WebKit, make its the default browser for future Gaxlaxy products.Samsung has posted recruitment advertisements for recruiting Webkit developers in its Advanced Software Platform Lab located in the Silicon Valley. Webkit is an open-source browser engine, Apple's Safari and Google's Chrome are based on this open source engine.For many users, the phone's built-in default browser is still the most used, so S...

   Samsung,Browser,Webkit     2012-09-24 22:32:00

  Use pdb to help understand python program

  As I have mentioned in Why do I need a debugger?: (3) Debugger is a good tool to help you understand code. So when I come across difficulty to understand vfscount.py code in bcc project, I know it is time to resort to pdb, python's debugger, to help me. The thing which confuses me is here: counts = b.get_table("counts") for k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print("%-16x %-26s %8d" % (k.ip, b.ksym(k.ip), v.val...

       2017-08-22 22:42:37

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