A fix for window.location.origin in Internet Explorer

Internet Explorer does not have access to window.location.origin, which is a bummer because it is a pretty handy variable to have, but we can make it work with a fairly straight forward check because we access .origin;

if (!window.location.origin) {
 window.location.origin = window.location.protocol + "//" + window.location.hostname + (window.location.port ? ':' + window.location.port: '');
}

This should now have .origin set to what you would expect.


Regards,

Animesh Nanda
Sr. Software Engineer,
Photon Infotech Pvt. Ltd.

Object-Oriented Inheritance with JavaScript

JavaScript does not support an explicit inheritance operator the way Java or C++ do.
However, there are two ways to implement inheritance in JavaScript:

1. Using functions . This is the classical way.
2. Using Prototype. This is recommended and more powerful way of doing.  

Inheritance through Functions

1. Define super class.
2. Define sub class.
3. Assign the superclass object to one of the member method of the sub class.
4. Call the superclass constructor function inside the subclass.

/* Step 1 : define super class
*/
function superClass() {
this.sayHello = function(){alert('Hello SuperClass');}
this.sayMessage = function(){alert('Say Message SuperClass');}
this.name = 'superClass';
}

/*
Step 2: define sub class
a) assign the superclass object to one of the function object
b) call the superclass constructor inside the subclass
*/
function subClass()
{
//you can use any propertyname instead of parentClass eg superclass
this.parentClass = superClass;
this.parentClass(); // assigns the super class methods to subclass
this.sayHello = function(){alert('Hello SubClass');}
}

/* test */
function testSub() {
var sc = new subClass();
sc.sayHello();
sc.sayMessage();
}

Explanation

The explanation is pretty simple if you know the concept of “this” keyword in JS.
Remember that the ‘this’ keyword refers to the containing object.
So, when you call the following line, you have copied the entire superClass object to the subClass property
parentClass.
this.parentClass = superClass;
Then when you call the following line the constructor of the ‘superClass’ is fired.
this.parentClass();
Now, inside the superClass function you have the following line:
this.sayHello = function(){alert('Hello SuperClass');}
What does ‘this’ refer to?
Since the enclosing object of ‘superClass’ is ‘subClass’, the ‘this’ keyword refers to it’s enclosing object i.e.
“subClass” and not the ‘window’ object. Therefore all the properties of ‘superClass’ get copied to the ‘subClass’.

Inheritance through Prototype

This is the most suitable method of implementing inheritance in JavaScript.
1. The main advantage of this method is that the inheritance chain is dynamic i.e you can assign or remove   new methods and properties to the super class that becomes available to the child class automatically.
2. Also, JS natively supports prototypal inheritance and not class based inheritance.
3. We can only do method overriding and not method overloading.

Steps:

1. Create a super class.
2. Attach all the callable methods of super class to it’s prototype. Important step!
3. Create a sub class.
4. Assign the subclass prototype object to the super class instance. This creates inheritance.
5. Reset the constructor property for the sub class usingChildClassName.prototype.constructor=ChildClassName. This ensures that the objects created are
of the sub class and not the super class.
6. Call the super class methods using ClassName.prototype.methodName.call(this,parameters…). This will
work only for methods added via the prototype.

/* create a super class */
function Person()
{
this.sayName = function(){alert("Person::sayName()");}
this.name = "Person";
}
//create the callable methods in super using it's prototype
Person.prototype.sayHello = function(name){alert("Person::sayHello()");}

/* create sub class */
function Student()
{
this.name = "Student";
this.sayName = function(){alert("Student::sayName()");}
}

/* derive the sub class from super class by using it's prototype */
Student.prototype = new Person;

/*Reset the constructor property for the subclass using it's prototype.constructor property*/
Student.prototype.constructor = Student;
//add new methods to the super class which become available to all the sub classes automatically
Person.prototype.sayNew = function(){alert("Person::sayNew()");}
//call super class method
Student.prototype.callParentMethod = function()
{
//call parent methods this will work because sayHello is part of the object prototype
hierarchy
Person.prototype.sayHello.call(this);
//this NOT will work because sayName is NOT declared using the superclass prototype
Person.prototype.sayName.call(this); //error
}
function testProtoInherit()
{
var sc = new Student;
sc.sayHello();
sc.sayName();
sc.sayName('amit');
alert(sc.name);
sc.sayNew();
sc.callParentMethod();
}
testProtoInherit();

With Regards,
Animesh Nanda
Sr.Software Engineer | Photon Infotech
Bengaluru | Karnataka | INDIA.

Javascript Prototype Object

Prototype is a builtin js property that is part of JS objects. It was introduced in JS version 1.1.

Prototype object can be added only to Function,String, Image, Number, Date and Array.

We can use prototype on the base class not on the objects derived from it.

The prototype object help you quickly add a custom method or member to an object that is

reflected on ALL instances of it.

Prototype object can only be used to add PUBLIC member and methods. It cannot add private

members or methods.

If the prototype object is used to override the the previously set property it will not override the

properties of already created objects. It will only affect the objects that have been created after

the prototype change.

Using prototype on custom objects:

var func = function(){};

func.prototype.foo = "bar"; //adds the property foo

alert(func.foo); //alerts undefined

func2 = new func();

alert(func2.foo); //alerts bar

func2.prototype.foo2 = 'ddd'; //Error : func2.prototype is undefined

Using prototype on builtin JS objects:

String.prototype.foo = "bar";

Image.prototype.foo = "bar";

Number.prototype.foo = "bar";

Array.prototype.foo = "bar";

You cannot use prototype on derived objects:

var str = new String();

str.prototype.foo = 'bar'; //Error : str.prototype is undefined

With Regards,
Animesh Nanda,
Sr. Software Engineer | Photon Infotech
Bengaluru | Karnataka | INDIA.

How to read directory or folder contents in PHP

TO GET ALL FILES ON RECURSIVE DIRECTORIES IN SINGLE ARRAY USE THE CODE GIVEN BELOW.

function getFilesFromDir($dir) { 

  $files = array(); 
  if ($handle = opendir($dir)) { 
    while (false !== ($file = readdir($handle))) { 
        if ($file != "." && $file != "..") { 
            if(is_dir($dir.'/'.$file)) { 
                $dir2 = $dir.'/'.$file; 
                $files[] = getFilesFromDir($dir2); 
            } 
            else { 
              $files[] = $dir.'/'.$file; 
            } 
        } 
    } 
    closedir($handle); 
  } 

  return $this->array_flat($files); 
} 

function array_flat($array) { 

  foreach($array as $a) { 
    if(is_array($a)) { 
      $tmp = array_merge($tmp, array_flat($a)); 
    } 
    else { 
      $tmp[] = $a; 
    } 
  } 

  return $tmp; 
} // Code to get folder contents (Usage) $dir = '/data'; $foo = $this->getFilesFromDir($dir); print_r($foo); ?>  




With Regards,
Er.Animesh Nanda
Sr. Programmer Analyst,
Innovate Search Pvt. Ltd..
Bengaluru,Karnataka,INDIA.

Showing and Hiding Windows Form in System Tray in VB .net

Show and Hide Windows Form in System Tray

How to show and hide your form in windows system tray.

1. Add NotifyIcon class in your project (System.Windows.Forms.NotifyIcon) and drag it into form.

2. Change NotifyIcon properties.

BalloonTipIcon = Info
BalloonTipText = Running
Change Icon
Text = Running Your Program
Visible = True

3. Add code in Event Form1_Resize.

Private Sub Form1_Resize(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles MyBase.Resize
' If minimize form that will show in system tray.
If System.Windows.Forms.FormWindowState.Minimized = WindowState Then
sysMonTray.ShowBalloonTip(5, "Running", "Running Your Program", ToolTipIcon.Info)
Me.Hide()
End If
End Sub


4. Add code in Event NotifyIcon_Click to hide and show form.

Private Sub sysMonTray_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles sysMonTray.Click

If Me.Visible Then
Me.Hide()
Else
Me.Show()
Me.ShowInTaskbar = True
Me.WindowState = FormWindowState.Normal
Me.StartPosition = FormStartPosition.CenterScreen
End If

End Sub

With Regards,
Er.Animesh Nanda
Manusis Technologies Pvt.Ltd.
Bengaluru,
Karnataka,INDIA.

Sphinx Commands For Beginners

#INDEXER

Configuring single index

indexer --config /full path/sphinx.conf myindex

Configuring all indices

indexer --config /full path/sphinx.conf --all

Rotating single index

indexer --rotate myindex

Rotating all indices

indexer --rotate --all

No output on rotation

indexer --rotate --all --quiet

Not to display progress detail

indexer --rotate --all --noprogress

#SEARCHD

Help

searchd --help

Configuring searchd

searchd --config /full path/sphinx.conf

Configuring port

searchd --port 9313

Status

searchd --status

Checking Status

searchd --config /full path/sphinx.conf --status

IO status

searchd --config /full path/sphinx.conf --iostats

CPU status

searchd --config /full path/sphinx.conf --cpustats

Setting PID file

searchd --config /full path/sphinx.conf --pidfile /home/myuser/sphinx.pid

Forcing to search specified index

searchd --index myindex

Stopping search process

searchd --config /full path/sphinx.conf --stop

Killing all search process

killall searchd

STEPS TO DO IF SPHINX SEARCH IS NOT WORKING

1. killall searchd
2. searchd --config /full path/sphinx.conf --status
3. searchd --pidfile --config /fullpath/sphinx.conf
4. searchd --config /full path/sphinx.conf --status
5. indexer --config /full path/sphinx.conf --all
6. indexer --rotate --all

COMMAND TO SEARCH

search -i myindex -e 'test'

Search Attributes
1. Match modes (--any / --phrase / --boolean / --ext / --ext2 / --filter attr v)
2. Set Limit (--limit count)
3. Set offset value (--offset count)
4. Sort by group (--group attr)
5. Sort by ASC/DESC (--sortby clause)
6. Sort by timestamp attribute (--rsort)




With Regards,
Er.Animesh Nanda
Software Developer,
Manusis Technology Pvt. Ltd.
Bengaluru,Karnataka,INDIA.

How to write Sphinx confugiration file ?

Four Steps to create a sphinx confugiration file

STEP - 1
Create a file named as sphinx.conf

STEP - 2
Declare a source as per following.

source src1
{
type = mysql
sql_host = host name
sql_user = user name
sql_pass = password
sql_db = database name
sql_port = 3306 # optional, default is 3306
sql_query = sql query for fetching data
sql_attr_uint = unique column eg id #can use more than one sql_attr_uint
sql_attr_timestamp = date_added
sql_query_info = sql query for viewing in command prompt
}

STEP - 3
Declare an index as per following.

index test1
{
source = src1
path = /var/lib/sphinxsearch/data/test1
docinfo = extern
charset_type = sbcs
enable_star = 1
min_prefix_len = 1
}


indexer
{
mem_limit = 32M
}

STEP - 4
Declare a searchd function as per following.

searchd
{
port = 9312
log = /var/log/sphinxsearch/searchd.log
query_log = /var/log/sphinxsearch/query.log
read_timeout = 5 #return null if no results found for 5 secs
max_children = 30
#maximum result to show in a dropdown or autocomplete
pid_file = /var/run/searchd.pid
max_matches = 1000 #maximum matches to get from database
seamless_rotate = 1
preopen_indexes = 0
unlink_old = 1
}


After each modification on sphinx.conf file, developer needs to rotate the index declared in the confugiration file.



With Regards,
Er.Animesh Nanda
Software Developer,
Manusis Technology Pvt. Ltd.
Bengaluru,Karnataka,INDIA.