Get key press events using JavaScript

Get Key Press Events Using JavaScript
script language="javascript" type="text/javascript"

function CheckPressedKey(Key)

{
switch(KeyID)
{
case 13:
alert("Key Pressed: Enter");
break;

case 16:
alert("Key Pressed: Shift");
break;

case 17:
alert("Key Pressed: Ctrl");
break;

case 18:
alert("Key Pressed: Alt");
break;

case 19:
alert("Key Pressed: Pause");
break;

case 37:
alert("Key Pressed: Arrow Left");
break;

case 38:
alert("Key Pressed: Arrow Up");
break;

case 39:
alert("Key Pressed: Arrow Right");
break;

case 40:
alert("Key Pressed: Arrow Down");
break;
}

}


End script

CheckPressedKey(event)

JavaScript trim function Equivalent of PHP trim Function

This function returns a string with whitespace stripped/removed from the beginning and end of string . Without the second parameter, trim() will strip these characters:

* " " (ASCII 32 (0x20)), an ordinary space.
* "\t" (ASCII 9 (0x09)), a tab.
* "\n" (ASCII 10 (0x0A)), a new line (line feed).
* "\r" (ASCII 13 (0x0D)), a carriage return.
* "\0" (ASCII 0 (0x00)), the NUL-byte.
* "\x0B" (ASCII 11 (0x0B)), a vertical tab.

In PHP we can easily use trim($string) and all whitespace are stripped And in JavaScript we use this function to stripped the White spaces.

function trim(sValue)
{
return sValue.replace(/^\s+|\s+$/g, "");
}

JavaScript Equivalent of PHP Explode Function

In PHP we can easily break a long string into smaller parts by using the explode() function of PHP. In run rime, this function works like this:

$string_to_Explode="JavaScript Equivalent of PHP Explode Function";
$explodestring=explode(" ", $string_to_Explode);

After the execution of the second command the variable $explodestring is an array such that,

$explodestring[0]="JavaScript"
$explodestring[1]="Equivalent"
$explodestring[2]="of"
$explodestring[3]="Explode"
$explodestring[4]="Function"

and so on. So how do we do it in JavaScript. In JavaScript there is a split() function that achieves the same objective, although the syntax is a bit different.

var string_to_explode="JavaScript Equivalent of PHP Explode Function";
var explodestring=string_to_explode.split(" ");


Now the Array explodestring has all those words such that,

explodestring[0]="JavaScript"
explodestring[1]="Equivalent"
explodestring[2]="of"
explodestring[3]="Explode"
explodestring[4]="Function"

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