Flash cards
Review the key moves
What is the main idea behind JavaScript Window - The Browser Object Model?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___.document.getElementById("header");Put the learning moves in the order that makes the concept easiest to apply.
The Browser Object Model (BOM) allows JavaScript to "talk to" the browser.
The Browser Object Model (BOM)
There are no official standards for the B rowser O bject M odel (BOM).
Since modern browsers have implemented (almost) the same methods and properties for JavaScript interactivity, it is often referred to, as methods and properties of the BOM.
The Window Object
The window object is supported by all browsers. It represents the browser's window.
All global JavaScript objects, functions, and variables automatically become members of the window object.
Global variables are properties of the window object.
Global functions are methods of the window object.
Even the document object (of the HTML DOM) is a property of the window object:
window.document.getElementById("header");is the same as:
document.getElementById("header");Window Size
Two properties can be used to determine the size of the browser window.
Both properties return the sizes in pixels:
- window.innerHeight - the inner height of the browser window (in pixels)
- window.innerWidth - the inner width of the browser window (in pixels)
The browser window (the browser viewport) is NOT including toolbars and scrollbars.
Example
let w = window.innerWidth;
let h = window.innerHeight;Other Window Methods
Some other methods
- window.open() - open a new window
- window.close() - close the current window
- window.moveTo() - move the current window
- window.resizeTo() - resize the current window