月度归档：2011年06月

How To Get URL Parts in JavaScript

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This JavaScript Tutorial article explains the Location object, and how to retrieve the URL from it in several parts, including how to parse, split, and rebuild URLs.

This JavaScript tutorial article concentrates on:

  • Obtaining the URL from the window.location object
  • Changing the current location with window.location.href and window.location.reload
  • Splitting and rebuilding URLs with Array and String splitting functions

The first step is understanding the JavaScript Location object.

The Location Object

This is a JavaScript class that is used to store URLs. It comes with properties that represent each part of the URL, and can be updated by changing the href property. The key properties that this article deals with are:

  • location.href : the full URL
  • location.protocol, location.host & location.pathname : the parts of the URL

In addition there are various methods that

  • location.reload
  • location.replace

These shall be discussed with reference to the window.location object.

The window.location Object

The window.location object is the specific object that stores the URL of the currently loaded page. If a JavaScript function changes the window.location.href property, then the page should reload with the new location.

However, this may not always be the case, and so the location.reload and location.replace methods have also been provided in the Location object. These were introduced in JavaScript 1.2, and give a little more control over the way that browsing history and current page location URLs are handled. In some cases it may not be enough to set the window.location.href, and so calling window.location.reload will force the page to be refreshed.

The window.location.replace method is used to overwrite the history entry in the browser, for the current page

Splitting and Rebuilding URLs

The URL is stored as the following parts:

protocol://host/pathname

Each part can be accessed using the appropriate property of the Location object:

  • location.protocol : for web pages, the value http
  • location.host : for this site www.suite101.com
  • location.pathname : the path to a page i.e. mypages/page1.html

It is important to note that:

  • The protocol is store without the : or // that make up the whole URL
  • The host will contain a port, where appropriate
  • the pathname does not contain the leading /

So, to rebuild a URL based on the above information, code such as the following can be used:

newURL = window.location.protocol + “//” + window.location.host + “/” + window.location.pathname;

This makes it very easy to create inline links that are context sensitive, and that refer pages that should exist on the server. For example, a site might have a tag page that collects all content that has the tag marketing associated with it. If the word marketing were to appear in a block of text, then JavaScript could be used to pre-process that block of text, and add a URL based on the current URL, but containing the reference to the marketing tag page.

One final note is that the pathname will be a / separated string, which can be split into an array of strings using the following code:

pathArray = window.location.pathname.split( ‘/’ );

Using this approach, it is easy to rebuild URLs, as each component will be contained in one array element. Again, however, it is necessary to put the / back:

newPathname = “”;
for ( i = 0; i pathArray.length; i++ ) {
newPathname += “/”;
newPathname += pathArray[i];
}

The JavaScript Split List or String article contains more details about using arrays and strings in this way.

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Passing parameter from HTML to Flash in Adobe CS4

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Suppoe we need pass the video name from HTML to Flash.

1.   Add the following  ActionScript into FLA:

# Display the video in screen

var my_fmt = new TextFormat();
my_fmt.color = 0xFF0000;
my_fmt.underline = true;
this.createTextField(“myTxt”, 1, 320, 10, 200, 20);
myTxt.autoSize = “left”;
myTxt.setTextFormat(my_fmt);

#  myVIDEO is the parameter from HTML
if (myVIDEO == undefined) {
myTxt.text = “Keynote_1.flv”;
} else {
myTxt.text = myVIDEO;
}

// create basic netConnection object
var nc:NetConnection = new NetConnection();

// connect to the local Red5 server
nc.connect(“rtmp://192.168.127.127/oflaDemo”);

// create the netStream object and pass the netConnection object in the constructor
var ns:NetStream = new NetStream(nc);

// attach the netStream object to the video object
videoContainer.attachVideo(ns);

// Play the video
ns.play(myTxt.text);

 

 

2.  Generate the SWF and HTML from FLA

 

 

3. Modify the generated HTML to add myVIDEO parameter,

   Three parts to be modified in HTML:

 

   A)  Add the following line in the  AC_FL_RunContent block:

       ‘FlashVars’,’myVIDEO=Keynote_2.flv’,

 

  B)  Add the following line in the  Object block:

      <param name=”FlashVars” value=”myVIDEO=Keynote_2.flv” />

 

  C)  Add the following into the embed scr block:

     FlashVars=”myVIDEO=Keynote_2.flv”

 

http://commondatastorage.googleapis.com/red5.zhenglei.net/Pass_Variable_From_Html_To_Flash.7z

 

setup red5 on ubuntu 10.10

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sudo apt-get update

sudo apt-get upgrade

sudo apt-get install sun-java6-jdk

sudo apt-get install sun-java6-jre

sudo apt-get install ant

sudo apt-get install subversion

sudo apt-get install ivy

cd /usr/share

sudo svn export  http://red5.googlecode.com/svn/java/server/trunk/

sudo mv trunk red5

sudo chown lzheng -R red5

sudo chgrp lzheng -R red5

cd red5

ant clean

ant dist

 

#  Install oflaDemo:

 

 

# Method 1:    Install from snapshots

wget http://red5.googlecode.com/svn/snapshots/oflaDemo-r3989-java6.war

mkdir oflaDemo && cd oflaDemo && unzip  ../oflaDemo-r3989-java6.war && cd ..

sudo mv oflaDemo  /usr/share/red5/dist/webapps/

 

 

# Method 2:    Install from dev trunk

# Download

svn export http://red5.googlecode.com/svn/java/example/trunk/oflaDemo/

 

# Setup build property

echo red5.root=/usr/share/red5/dist > ~/build.properties

#echo build.optimize=true >> ~/build.properties

# echo debug.status=false >> ~/build.properties

 

cd oflaDemo

ant clean

ant

# Result:   dist/oflaDemo.war

mkdir oflaDemo && cd oflaDemo && unzip  ../dist/oflaDemo.war && cd ..

sudo mv oflaDemo  /usr/share/red5/dist/webapps/

 

 

 

 

VPS ubuntu 10.10 config (9) *** PPTP VPN***

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# Install

sudo apt-get update

sudo apt-get upgrade

sudo apt-get install pptpd

 

#Config DNS

sudo nano /etc/ppp/pptpd-options,  and enter the following:

  ms-dns 8.8.8.8

  ms-dsn 8.8.4.4

 

#Config Password:

sudo nano /etc/ppp/chap-secrets

    acount [TAB] pptpd [TAB] password [TAB] IP addresses

 

# Config IP

sudo nano /etc/pptpd.conf,   and enter the following:

localip 10.168.10.1  
remoteip 10.168.10.10-20


# Config IP forward and IP Nat

net.ipv4.ip_forward=1
sudo iptables -t nat -A POSTROUTING -s 10.168.10.0/24 -o eth0 -j MASQUERADE

VPS ubuntu 10.10 config (8) *** OpenVPN***

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sudo apt-get update

sudo apt-get upgrade

sudo apt-get install openvpn

 

#Generage certification and key

cp -r /usr/share/doc/openvpn/examples/easy-rsa/2.0   ~/

cd ~/2.0

source vars
./clean-all
./build-ca
./build-key-server <servername>
./build-key <clientname>
./build-dh

 

# add extra key

source vars
./build-key-server <servername>
or
./build-key <clientname>

 

# Config OpenVPN listen on port 443, and share port 443 with SSH

 

Example of config file:

example_vps_etc.7z

 

Reference:

http://forum.ubuntu.org.cn/viewtopic.php?p=532825

 

 

 

Enable UpnP/DLNA on WIndows XP

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(1) Enable  SSDP Discovery Service

   Start -> Setting -> Control Plane -> Administrative Tools-> Service -> SSDP Discovery Service

 

(2) Add UPnP Windows Component

  Start -> Setting -> Control Plane -> Add or Remove Program -> Add/Remove Windows Component -> Network Service -> UPnP User Interface + Internet Gateway Discovery

 

(3) Enable UPnP in Windows XP Firewall

  Start -> Setting -> Control Plane-> Windows Firewall -> Exception -> UPnP Firewall

 

Refer Link:

http://hi.baidu.com/chenshake/blog/item/ea299f8b398a8ed7fc1f1008.html