Notesale: Turn your study into money

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5th Sept 2015


The internet is a network of networks



World Wide Web is an information sharing model built on top of the
internet consisting of a collection of web pages



A web page is an electronic document



A website is a collection of related webpages



A client requests services/information
...




The software determines whether a computer is a client or a server



A browser is a client software that fetches information from a web server



A protocol is a rule that governs the communication between devices over
a network



A domain is an address to a website



IP address uniquely identifies a device on a network



A DNS consists of a list of registered domain names with their
corresponding IP address
...
All statements must be terminated with a semicolon

12th Sept 2015


A web application is a program; a functional website



JS is a scripting language which is a lightweight programming language



JS does not have direct access to a file system, nor does it talk to a
database directly unless using AJAX



JS can only be embedded or executed in a web page



Divided into 2 categories: client side or server side



Client side - executed by a browser



Server side - executed by a web server



JS is a client side scripting language because it is executed by a browser
...
It must be terminated by a colon



A variable is a memory location that stores a single value



Variables are important because you can refer to them at a later time



Data types - classification of data that indicates the type of data stored



JS data types: String, number, boolean, undefined, null



JS is a loosely typed language because it does not adhere to strict
programming rules



A reserved word has a specific meaning or purpose



Comments are used to document in a program



The word "continue" forces the continuation of a particular iteration

26th Sept 2015
Saturday, 26 September 2015
1:49 PM


DOM – Document Object Model is not a programming language,
is not a part of JavaScript
...




Document- web page; Object – individual pieces; Model – agreed
upon rules (diagram)



JS sees webpage as a hierarchical tree of objects



Node can either be an element, an attribute or a text in a DOM
tree



For a node to be an element, it must be a tag



An attribute node is drawn to the left hand side of the element
node



Every component is called a node



Inner HTML is a property of the DOM tree that refers to
everything under a particular element node



JS, via DOM, can access any element on a web page



getElementById() – allows JS to access an individual item
...
Always return only
one object
...
Always return an array object with several
elements



getElementsByName() – Groups elements
...
Always return an array object with several
elements



getElementsByClassName() – Groups elements
...
Always return an array object with several
elements



A method is a function that is attached to an object
...
A function is a set
of executable code
...
getElementById("loanAmt")
...
cssproperty = value;

Document
...
style
...
test() - accepts a string argument, returns true



^ - denotes the start of a string




If using both symbols example regE=/^abc$/; , then the String will only be
true if it is only "abc"


What is a web stack?
You must know about:


Operating System



Web server



DBMS



Server side scripting language

This is important for compatibility

1st Nov 2015
Sunday, 1 November 2015
9:01 AM


Regular expressions are a sequence of characters that defines a pattern



Purpose of regular expressions is for pattern matching




...
test(text) == true)
{
alert("Matches pattern");
}
else
{
alert("Doesn't match pattern");
}





$ - denotes the end of a string



[] denotes a range of characters