Javascript Home, Intro, Where To, and Output
JavaScript Can Change HTML Styles (CSS)
Changing the style of an HTML element, is a variant of changing an HTML attribute
JavaScript Can Hide HTML Elements
Hiding HTML elements can be done by changing the display style
A JavaScript function is a block of JavaScript code, that can be executed when "called" for. For example, a function can be called when an event occurs, like when the user clicks a button.
[ ]
External JavaScript Scripts can also be placed in external files Example: myScript.js
[ ]
External scripts are practical when the same code is used in many different web pages.
[ ]
JavaScript accepts both double and single quotes: document.getElementById('demo').innerHTML = 'Hello JavaScript'; OR document.getElementById("demo").innerHTML = "Hello JavaScript";
[ ]
JavaScript files have the file extension .js.
[ ]
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
[ ]
Placing scripts at the bottom of the <body> element improves the display speed, because script interpretation slows down the display.
[ ]
Placing scripts in external files has some advantages: It separates HTML and code It makes HTML and JavaScript easier to read and maintain Cached JavaScript files can speed up page loads
[ ]
To add several script files to one page - use several script tags
[ ]
You can place any number of scripts in an HTML document. Scripts can be placed in the <body>, or in the <head> section of an HTML page, or in both.
[ ]
(T/F) JavaScript Can Change HTML Content
true
JavaScript Can Change HTML Attribute Values
true
document.getElementById("demo").innerHTML = "Hello JavaScript";
"finds" an HTML element (with id="demo"), and changes the element content (innerHTML) to "Hello JavaScript"
JavaScript Can Show HTML Elements
Showing hidden HTML elements can also be done by changing the display style
Create a variable called carName and assign the value Volvo to it.
var carName= "Volvo";
