Javascript

JavaScript
Green Apple
Computer Learning
*

*
*Javascript is a dynamic computer programming
language.
*It is lightweight and most commonly used as a
part of web pages, whose implementations
allow client-side script to interact with the
user and make dynamic pages.
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*
*It is an interpreted programming language
*It object-based language
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*JavaScript was first known as LiveScript, but
Netscape changed its name to JavaScript,
possibly because of the excitement being
generated by Java.
*JavaScript made its first appearance in
Netscape 2.0 in 1995 with the name
LiveScript.
11/20/20164

*
*JavaScript is a lightweight, interpreted
programming language.
*Designed for creating network-centric
applications.
*Complementary to and integrated with Java.
*Complementary to and integrated with HTML.
*Open and cross-platform
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*
*Client-side JavaScript is the most common
form of the language.
*The script should be included in or referenced
by an HTML document for the code to be
interpreted by the browser.
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*
*It means that a web page need not be a static
HTML, but can include programs that interact with
the user, control the browser, and dynamically
create HTML content.
*The JavaScript client-side mechanism provides
many advantages over traditional CGI server-side
scripts. For example, you might use JavaScript to
check if the user has entered a valid e-mail address
in a form field.
*The JavaScript code is executed when the user
submits the form, and only if all the entries are
valid, they would be submitted to the Web Server.
*JavaScript can be used to trap user-initiated events
such as button clicks, link navigation, and other
actions that the user initiates explicitly or
implicitly.
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*
*Less server interaction
*Immediate feedback to the visitors
*Increased interactivity
*Richer interfaces
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*
*You can validate user input before sending the
page off to the server. This saves server traffic,
which means less load on your server.
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*
*They don't have to wait for a page reload to
see if they have forgotten to enter something.
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*
*You can create interfaces that react when the
user hovers over them with a mouse or
activates them via the keyboard.
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*
*You can use JavaScript to include such items as
drag-and-drop components and sliders to give a
Rich Interface to your site visitors.
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*
*Client-side JavaScript does not allow the
reading or writing of files. This has been kept
for security reason.
*JavaScript cannot be used for networking
applications because there is no such support
available.
*JavaScript doesn't have any multithreading or
multiprocessor capabilities.
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*
*Microsoft FrontPage
*Macromedia Dreamweaver MX
*Macromedia HomeSite 5
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*
*Microsoft has developed a popular HTML editor
called FrontPage.
*FrontPage also provides web developers with a
number of JavaScript tools to assist in the
creation of interactive websites.
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*
*Macromedia Dreamweaver MX is a very popular
HTML and JavaScript editor in the professional
web development crowd.
*It provides several handy prebuilt JavaScript
components, integrates well with databases,
and conforms to new standards such as XHTML
and XML.
11/20/201616

*
*HomeSite 5 is a well-liked HTML and JavaScript
editor from Macromedia that can be used to
manage personal websites effectively.
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*
*The <script> tag alerts the browser program to
start interpreting all the text between these
tags as a script.
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*
*Language
*Type
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*
*This attribute specifies what scripting language
you are using. Typically, its value will be
javascript. Although recent versions of HTML
andXHTML, itssuccessor have phased out the
use of this attribute.
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*
*This attribute is what is now recommended to
indicate the scripting language in use and its
value should be set to "text/javascript".
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*
<script language="javascript" type="text/javascript">

</script>
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*
*Numbers, eg. 123, 120.50 etc.
*Strings of text e.g. "This text string" etc.
*Boolean e.g. true or false
*null
*Undefined
*object
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*
*Variables are declared with the var keyword as
follows
<script type="text/javascript">

</script>
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*

</script>
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*
*JavaScript is untyped language. This means
that a JavaScript variable can hold a value of
any data type.
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*
*Global Variables
*Local Variable
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*
*A global variable has global scope which means
it can be defined anywhere in your JavaScript
code.
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*
*A local variable will be visible only within a
function where it is defined. Function
parameters are always local to that function.
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*

</script>
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*
*Arithmetic Operators
*Comparision Operators
*Logical orRelational Operators
*Assignment Operators
*Conditional orternary Operators

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*
*The typeof operator is a unary operator that is
placed before its single operand, which can be
of any type. Its value is a string indicating the
data type of the operand.

11/20/201675
*
*The JavaScript navigator object includes a
child object called plugins.
*This object is an array,with one entry for each
plug-in installed on the browser.
*The navigator.plugins object is supported only
by Netscape, Firefox, and Mozilla only.

11/20/201680
*
*To get information about the browser your
webpage is currently running in, use the built-
in navigator object

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*
*appCodeName
*appVersion
*Language
*mimTypes[]
*platform[]
*plugins[]
*userAgent[]

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*
*This property is a string that contains the code
name of the browser, Netscape for Netscape
and Microsoft Internet Explorer for Internet
Explorer.

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*
*This property is a string that contains the
version of the browser as well as other useful
information such as its language and
compatibility.

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*
*This property contains the two-letter
abbreviation for the language that is used by
the
*browser. Netscape only.

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*
*This property is an array that contains all MIME
types supported by the client. Netscape only.

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*
*This property is a string that contains the
platform for which the browser was
compiled."Win32" for 32-bit Windows operating
systems.

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*
*This property is an array containing all the
plug-ins that have been installed on the client.
Netscape only.

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*
*This property is a string that contains the code
name and version of the browser.
*This value is sent to the originating server to
identify the client.

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*
*javaEnabled()
*plugings.refresh
*preference(name,value)
*taintEnabled()

11/20/201690
*
*This method determines if JavaScript is
enabled in the client. If JavaScript is enabled,
this method returns true; otherwise, it returns
false.

11/20/201691
*
*This method makes newly installed plug-ins
available and populates the plugins array with
all new plug-in names. Netscape only.

11/20/201692
*
*This method allows a signed script to get and
set some Netscape preferences. If the second
parameter is omitted, this method will return
the value of the specified preference;
otherwise, it sets the value. Netscape only.

11/20/201693
*
*This method returns true if data tainting is
enabled; false otherwise.

Javascript

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