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  1. I thought i would share some of my knowledge on Javascript with all of you guys. Note: i created this back in 2011-2012. This is the first time i'm sharing it with anyone. [COLOR=#ff0000][SIZE=4]PROGRAMMING WITH JAVA SCRIPT [/SIZE][/COLOR] INSTEAD OF OTHER GUIDES WHERE ALL YOU ARE GIVEN IS CODES, I ACTUALLY EXPLAIN WHAT THE HELL YOU ARE CODING. PLEASE TAKE THE TIME TO READ EVERYTHING. THAT'S THE ONLY WAY YOU WILL TRULY UNDERSTAND JAVA SCRIPT. [COLOR=#0000ff][SIZE=3]CHAPTER 1 [/SIZE][/COLOR] Server Side • Server side scripts reside on the server (main computer) while client side scripts reside on a user PC • Storing all programs on the server allows multiple users simultaneous access but poses potential connection and performance issues. Client Side • While client side scripts are not as powerful and will never fully replace server side scripts, they do offer a convenient alternative for performing some of the simple, low-key tasks locally. Why JavaScript? • HTML allows developers to create static web pages, the information and look of the page does not change. • JavaScript allows you to create pages where content and layout can be modified using special code built into the page. [COLOR=#ff0000][SIZE=3]Java vs. JavaScript [/SIZE][/COLOR] [COLOR="#800080"]I included this for people who have no knowledge of Java or Javascript and would like to know the difference.[/COLOR] Java • Code is powerful but complex • A special app (JDK) required • Programs must be saved and compiles separately • Used for complex tasks JavaScript • Code is easy to learn and to use • No additional software is needed • Code can be added directly anywhere in the HTML text editor • Used for quick, simple tasks [COLOR=#ff0000][SIZE=3]Code Example[/SIZE][/COLOR] [CODE] <script> document.write(“Today is 12/20/2011 <BR>”) document.write(“Only 10 days until the New Year!”) </script> [/CODE] [COLOR=#ff0000][SIZE=3] Variables[/SIZE][/COLOR] • A Variable is a verbal representation of information that can be substituted for information. • Before you can use a variable can be used in the code it has to be created using a variable declaration. Variable Types • Numeric variables- any number in standard or scientific notification • String Variables – text (Must be in quotes) • Boolean variables- TRUE/FALSE. Used when you want the program to act depending on condition • Null Variables- a variable without an assigned value. [COLOR=#ff0000][SIZE=3]Naming Rules[/SIZE][/COLOR] • The first character must be a letter or an underscore • The remaining characters must be letters, numbers or underscores • Names cannot contain spaces • JavaScript code items cannot be used as variable names. [COLOR=#ff0000][SIZE=3]Variable Example[/SIZE][/COLOR] --------------------------------------- var month ="March"; document.write(“School starts in” + Month); OR month = “March”; document.write(“School starts in” + Month); --------------------------------------- Both of the codes above will yield the same result. Which is: [COLOR="#FF0000"]School starts in March[/COLOR] [COLOR=#ff0000][SIZE=3]Expressions and Operators[/SIZE][/COLOR] • A JavaScript expression is a command that is used for assigning values to defined variables. • A JavaScript operator is an element that can be used within an expression to perform and action, such as adding or combining multiple elements.. • The most commonly used operator is the equal sign (=) that will assign a value to the preceding variable. • Another example of an operator is the plus sign (+) used for combining multiple elements. [COLOR=#ff0000][SIZE=3]Assignment Operators [/SIZE][/COLOR]• In JS, values are assigned to variables using assignment operators. • An example is the equal sign (=) [COLOR=#ff0000][SIZE=3]Functions[/SIZE][/COLOR] • A function is a series of commands that can be executed by your program to calculate a value or perform an action [COLOR=#ff0000][SIZE=3]Benefits of Funtions[/SIZE][/COLOR] • Complex programming tasks can be broken down into simpler steps • Code does not have to be duplicated within a program • Code can be reused multiple times by a placing a simple function call anywhere is the program [COLOR=#ff0000][SIZE=3]Declaration [/SIZE][/COLOR]• A function has to be created using a function declaration like the one below --------------------------------------- Function Name(Function Variables) { Function Commands; } --------------------------------------- [COLOR=#ff0000][SIZE=3]Three major parts of a function:[/SIZE][/COLOR] Function Name= identifies each function Parameters= Values needed by the function to produce the expected result Commands= Actions that will be executed when the function runs. Calling a function Whenever you need to use the function you created you must insert this piece of code: --------------------------------------- FunctionName(Variables); --------------------------------------- (Replace "FuntionName" with the name you created for your function. Replace "Variables" with whatever variables you need to use) [COLOR=#0000ff][SIZE=3]End of Chapter 1 [/SIZE][/COLOR] [size=4][color=#0000ff]Chapter 2[/color] [/size] [SIZE=3][color=red]Arrays[/color][/size] • In a typical computer program, data cannot be stored without the use of a database such as Access, Oracle, DB2 etc. • Some of the program data, however, can be stored on a temporary basis by using data structures known as arrays. • An array is a systematic arrangement of objects, usually is a rows and columns. Like a table./ single column table with a name assigned to it [size=3][color=red]Array Example[/color][/size] [size=3]--------------------------------------------[/size] Var ArrayName= new Array(size); ArrayName[index]= value; ArrayName[index2]=value 2 ; [size=3]--------------------------------------------[/size] • The size is expressed as the number of elements that the array is going to contain. • You can leave the size blank and have JavaScript automatically increase the array size as new elements are added. • Index represents the row number [SIZE=3][COLOR=#0000ff]Coming up:[/COLOR] [COLOR=#0000ff][SIZE=2] Loops Objects/Events Prompting user for input Creating calculated fields Validating user input[/SIZE][/COLOR][/SIZE]
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