The reasons for using anonymous functions

March 20th, 2015 prakash No comments

There are a lot of good reasons to support anonymous functions in a programming language. In JavaScript, the uses generally fall under two rough categories: iteration and deferred execution.

Iteration with anonymous functions

Iteration has a lot of uses – you can sort a collection, map one collection to another, reduce a collection down into a single value, etc. It basically comes down to going through a collection and doing something with each item, somehow. I’m going to show a very basic example of iteration – going through a list of numbers and printing each one. JavaScript has a

for/in loop as well, but it doesn’t really work very well on arrays. The standard way to iterate over an array is with the humble for loop: var arr = [1, 2, 3, 4]; for (var i = 0, len = arr.length; i < len; i++) { console.log(arr[i]); } here is the jQuery version: var arr =

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[1, 2, 3, 4]; $.each(arr, function(index, value) { console.log(value); });

Deferred execution

This is where a function is passed to another function for later use (this is often called a callback). For example, in jQuery.getJSON: $.getJSON('ajax/test.json', function(data) { console.log(data); });

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Finding Location of site visitor

May 26th, 2011 prakash No comments

There are few approaches to find the location of the visitor with their IP. I’ll show you some of the approaches that I know :

jQuery1.5 Cheat Sheet

April 4th, 2011 prakash No comments

jQuery Cheat Sheet for version

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1.5, use it for quick reference on learning jquery. Launch PDF file.

logical NOT NOT operator (!!) ?

March 24th, 2011 prakash No comments

The logical NOT operator can also be used to convert a value into its Boolean equivalent. By using two NOT operators in a row, you can effectively simulate the behavior of the Boolean() casting function. The first NOT returns a Boolean value no matter what

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operand it is given. The second NOT negates that Boolean value and so gives the true Boolean value of a variable. The end result is the same as using the Boolean() function on a value. An Example: alert(!0); //true alert(!!0); //false alert(!NaN); //true alert(!!NaN); //false

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arguments.callee – javascript useful property

March 23rd, 2011 prakash No comments

The arguments object is an array like object that contains all of the arguments that were passed into the function. Though its primary use is to represent function arguments, the arguments object also has a property named callee , which is a pointer to the function that owns the arguments object. Consider the following classic factorial function done with arguments.callee

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 function factorial(num){ if (num < = 1) { return 1; } else { return num * arguments.callee(num-1) } } 

There is no longer a reference to the name “ factorial ” in the function body, which ensures that the recursive call will happen on the correct function no matter how the function is referenced.

Finding n-th level of sibling on DOM with jquery

March 20th, 2011 prakash No comments

By clicking on an element in

DOM, to get the which

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indexed number of the sibling, you’ll need to use jquery’s .index() method which is easy and useful too. Let’s give an example, HTML :

 <ul> <li>first</li> <li>second</li> <li>third</li> </ul> 


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() { alert($(this).index()); });

Enjoy jquery

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CSS and javascript hack for Safari Browser

March 16th, 2011 prakash No comments

Since the Safari and chrome browser uses same webkit, differentiating safari and google chrome browser will be a difficult part. Finally I’ve found out the solution for it, CSS HACK: for both chrome and safari browser,

@media screen and (-webkit-min-device-pixel-ratio:0){ #yourdiv{ margin-left:0; } } 

Javascript Hack : for both chrome and safari browser,

if(window.devicePixelRatio) { alert('This is safari or chrome browser'); }

Javascript Hack : for safari and only safari browser,

if (navigator.userAgent.match(/AppleWebKit/) && ! navigator.userAgent.match(/Chrome/)) { alert('this is safari
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Forced Download – PHP

February 14th, 2011 prakash No comments

Use this code :

 $file = 'index.php'; if (file_exists($file)) { header('Content-Description:
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File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename='.basename($file)); header('Content-Transfer-Encoding: binary'); header('Expires: 0'); header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); header('Pragma: public'); header('Content-Length: ' . filesize($file)); ob_clean(); flush(); readfile($file); exit; }
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What is metaprogramming?

February 10th, 2011 prakash No comments

It’s writing code to write code. It’s dynamic

code generation. It’s the move from imperative to declarative. It’s a

rejection of Java’s endless repetition of boilerplate code. It’s the living embodiment of DRY. Here’s an example:

 class Monkey def name @name end def name= n @name = n end end
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Implementing Jquery in Joomla

February 5th, 2011 prakash No comments

Joomla Uses Mootools as it’s javascript library by default, so we’ll need to use the jquery’s power of flexibility ie, jquery noConflict. Below are the examples how to use it.

In admin :

 $document =JFactory::getDocument(); $document->addScript('location_to_jquery/jquery-min.js'); $scripts = "jQuery.noConflict()"; $document->addScriptDeclaration($scripts); 

In Site :

from template :

  // insert this code inside the  tag before  tag 

From module
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and component:

 $document = JFactory::getDocument(); $document->addScript('location_to_jquery/jquery-min.js'); $scripts = "jQuery.noConflict()"; $document->addScriptDeclaration($scripts);