4. Collections of Data
What if we had a collection of images that we
wanted to display to the screen, one at a time?
How could we store all the images?
5. Collections of Data
var image_1 = “images/image_1.jpg”;
var image_2 = “images/image_2.jpg”;
var image_3 = “images/image_3.jpg”;
var image_4 = “images/image_4.jpg”;
var image_5 = “images/image_5.jpg”;
7. Arrays
An array provides a simple organized way to
track a list of related items.
Think of a array like a …
● toaster
● shopping list
● file cabinet
14. Array Indexing
Array elements can be fetched by their index
number (starts from 0).
Elements can be viewed in the JavaScript
console.
console.log(myArr[0]); // prints Sunday
16. Array Indexing
We can insert new values into any space in the
array using the positions index.
myArr[4] = ‘Humpday’;
17. Array Indexing
We can overwrite all the elements of an array
simply by giving the array new values or by
setting an array equal to a different array.
18. Array Indexing
var fruits = ['Apples', 'Oranges', 'Pears', 'Grapes'];
myArr = fruits;
console.log(myArr); // prints Apples, Oranges,
Pears, Grapes
19. Array Length
What if you would like to know how long the
array is (how many elements)?
console.log(myArr.length); // prints 4
20. Manipulating Collections
How to iterate over an array:
fruits.forEach(function(element,index){
console.log(element,index);
});
21. Assignment
Create an array of sports teams (or other
collection of stuff) and print them to the page.
Examples:
NHL Eastern Conference Standings
NBA Atlantic Standings
MLB American League East Standings
22. Lab (proposed)
Description: Students create a basic image
carousel using arrays and .each jQuery
function.
Hint: Go to the API documentation at jquery.
com to review the documentation and practice
examples of the .each() function.
23. Lab (proposed)
Notes:
● Students can decide to use the provided
photos of food or animals or pull photos from
another location.
● Students will use the .click() method to
navigate between pictures.
24. Lab (proposed)
Instructions:
● The first part of this exercise is timed!
● Create the HTML for the page (15 minutes)
● Add CSS to style the page (15 minutes)
25. Lab (proposed)
After 30 minutes, provide students with
HTML/CSS starter code.
The remainder of the time should be used to
implement the JavaScript code.
This exercise will carry over into next session.
26. Lab (proposed)
Bonus: They will use the change event to give
a ranking to the photos between 1 and 5. The
user should be forwarded to the next image
after voting.
27. Lab (alternate)
Access the jQuery Plugin Registry
Access the slider tag
Select Anything Slider
Get AnythingSlider working independently
Incorporate AnythingSlider into Divided Times
Continued in Lesson 11 (Lab)
