Before you
build a website that is responsive, you should know first about javascript.
Then what is javascript?.
JavaScript is
a language in the form of a collection of scripts that are running on an HTML
document. Throughout the history of the internet is the first scripting
language for the web. This language is a programming language to provide
additional capabilities against the HTML language by allowing commands executed
on the user's side, meaning that the browser side instead of on the server side
of the web.
JavaScript
is a language that is "case sensitive" means to distinguish the
variable naming and functions that use uppercase and lowercase letters,
examples of variables or functions with different TEST with variable name
with a name
of test. And the latter languages such as Java or C, although this is not
mandatory, any instruction may be terminated with a semicolon (;).
Writing
Javascript Code
There are
several ways to write the Javascript code in the
document/ HTML
page, i.e. using the tag <script>, use external files, and through
specific events.
1. Use the
<SCRIPT> tag. example:
< script
language = "javascript" >
......
</script>
2. using
external files
The next way
is to write a Javascript program code in a text file and then a text file that
contains the Javascript code in the callback from within a HTML document
(specifically Netscape starting with version 3 and above). example:
< script
language = "javascript" src = "location/file.js" >
</script>
3. Through a
particular event
The event is
a term from one of the action performed by the user, such as the click of the
mouse buttons, further discussion is on other material. example:
< tag
eventHandler = "Javascript code that will be inserted" >
Writing
comments in Javascript
We can use
the same way with the existing rules on language C/C++ or Java.
a. to write
comments in a row
We can use
the double forward slash characters (//). example:
// all the
characters behind the sign of "//" will not be executed
b. to write
comments that consist of a few lines
We can use
the characters/* and */ . example:
/* All lines
between the 2 marks will not be executed by the compiler */
Example
program:
<html>
<head>
<title>
sample of javascript programs </title>
</head>
<body>
< script
language = "javascript" >
alert
("Hello!");
</script>
</body>
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