JavaScript

What is JavaScript?

• JavaScript is the programming language of HTML and the Web.
• JavaScript is easy to learn.

Why Study JavaScript?

JavaScript is one of the 3 languages all web developers must learn:
   1. HTML to define the content of web pages
   2. CSS to specify the layout of web pages
   3. JavaScript to program the behavior of web pages

JavaScript Can Change HTML Content

One of many JavaScript HTML methods is getElementById().
This example uses the method to "find" an HTML element (with id="demo") and changes the element content (innerHTML) to "Hello JavaScript":

document.getElementById("demo").innerHTML = "Hello JavaScript";  

JavaScript Can Change HTML Attributes

This example changes an HTML image by changing the src (source) attribute of an <img> tag:

<onclick="document.getElementById('myImage').src='pic_bulbon.gif'">

JavaScript Can Change HTML Styles (CSS)

Changing the style of an HTML element, is a variant of changing an HTML attribute:

document.getElementById("demo").style.fontSize = "25px";
or
document.getElementById('demo').style.fontSize = '25px';  

JavaScript Can Hide HTML Elements

Hiding HTML elements can be done by changing the display style:

document.getElementById("demo").style.display = "none";
or
document.getElementById('demo').style.display = 'none';  

JavaScript Can Show HTML Elements

Showing hidden HTML elements can also be done by changing the display style:

document.getElementById("demo").style.display = "block";
or
document.getElementById('demo').style.display = 'block';  

USING THE TERMINAL

USING THE TERMINAL  

Introduction to using the command-line interface terminal

-File & Directory Commands-

• pwd: The pwd command will allow you to know in which directory you're located (pwd stands for "print working directory"). 
• ls: The ls command will show you ('list') the files in your current directory.
• cd: The cd command will allow you to change directories.
• cp: The cp command will make a copy of a file for you.  
• mv: The mv command will move a file to a different location or will rename a file.
• rm: Use this command to remove or delete a file in your directory.  
• rmdir: The rmdir command will delete an empty directory.
• mkdir: The mkdir command will allow you to create directories.
• cad:As a user, you often need to view some of text or code from your script. Again, one of the Linux basic commands is cat command. It will show you the text inside your file.
• nano:Nano is text editor in console, if the <file-name> doesn’t exist nano creates the file and if exist nano opens the file.