1. Nick Sims
Scripting Languages

2. Dynamic Web Sites Static websites are old fashioned
Dynamic websites are preferred and they are easier to maintain once they “go live” on the Internet

3. Types of scripting languages
HTML (what does it stand for?)
(Hyper Text Markup Language)
JavaScript
VBScript

4. Nature of Language
Object-oriented languages: the code is broken into objects
Each object knows what it can do (how what and how it can interact) and is a self-contained module
Event driven language – the code is broken into handling events i.e.
An action – mouse click, key pressed or transmission of data

5. Objects and methods
Each object has properties and these properties have values.
A method is how an object can carry a task out
<script>
hw=“Hello World” document.write(hw.toUpperCase())
</script>
The output is HELLO WORLD on screen

6. Security
As code is being executed this is a possible entry route for hackers making the client’s computer system and the web site vulnerable
Also unscrupulous website owners could read the contents of a client’s computer
Such as data mining, opening applications and reading other browser windows

7. Including scripts inside HTML
HTML is interpreted by the browser and executed line by line
Functions such as script functions can be placed anywhere as they are not run until they are called
Script needs to be placed between <script> and </script> tags for the browser to know it is not interpreting HTML

8. Scripting Language Constructs
Variables and operators
Variables hold data
Operators can be used to perform calculations and assign values to variables
Loops – piece of code executed repetitively
Decision making (known as selection)
Functions – written separately, which can be called and executed whenever required
Parameter – where a value in a bracket of passed to the function to use