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# Lesson 10

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### Transcript of "Lesson 10"

1. 1. Front-End Web Development Lesson 10 Arrays
2. 2. Agenda ● ● ● ● ● ● Pizza Review Divided Times Collection of Data Manipulating Collections Lab Introduction to Final Project
3. 3. Divided Times Class examples The GA solution
4. 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. 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”;
6. 6. Collections of Data
7. 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
8. 8. Declaring Arrays First Option: Declaring an empty array using the array constructor. var myArr = new Array();
9. 9. Declaring Arrays Second Option: Declaring an empty array using literal notation. var myArr = [ ];
10. 10. Declaring Arrays myArr = [‘Hello’, 54.3, true]; ● ● Arrays are filled with elements Elements can be strings, numbers or booleans
11. 11. Declaring Arrays myArr = [ ‘Sunday’, ‘Monday’, ‘Tuesday’, ‘Wednesday’, ‘Thursday’, ‘Friday’, ‘Saturday’ ];
12. 12. Declaring Arrays If you leave a blank spot in an array it creates a blank shelf space, an undefined placeholder.
13. 13. Array Indexing
14. 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
15. 15. Code Along arrays.html
16. 16. Array Indexing We can insert new values into any space in the array using the positions index. myArr[4] = ‘Humpday’;
17. 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. 18. Array Indexing var fruits = ['Apples', 'Oranges', 'Pears', 'Grapes']; myArr = fruits; console.log(myArr); // prints Apples, Oranges, Pears, Grapes
19. 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. 20. Manipulating Collections How to iterate over an array: fruits.forEach(function(element,index){ console.log(element,index); });
21. 21. Assignment Create an array of sports teams and print them to the page. Examples: AFC East Standings NBA Atlantic Standings MLB American League East Standings
22. 22. Lab 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. 23. Lab 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. 24. Lab 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. 25. Lab 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. 26. Lab 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. 27. Introduction to Final Project Description: ● Design and build a website of your choice
28. 28. Introduction to Final Project Objectives: ● Demonstrate understanding of all topics ● Apply knowledge to build a website from the ground up ● Create an efficient website compatible with modern browsers and devices
29. 29. Introduction to Final Project Remaining Topics: ● Responsive design ● HTML forms ● jQuery animation
30. 30. Introduction to Final Project Core Requirements (HTML5): ● HTML5 structural elements ○ header, footer, nav, etc. ● ● Include classes and IDs Additional tags, as appropriate
31. 31. Introduction to Final Project Core Requirements (CSS): ● Demonstrate fonts and color ● Demonstrate floats and the box model ● External CSS
32. 32. Introduction to Final Project Core Requirements (Interactive): ● Use JavaScript / jQuery events to add interactivity ● External scripts
33. 33. Introduction to Final Project Deliverables: ● Project folder with HTML, CSS, JavaScript/jQuery and assets ● Hosted on GA server
34. 34. Introduction to Final Project Best Practices: ● Clean and readable code ● Search Engine Optimization (SEO) ● Avoid deprecated tags
35. 35. Introduction to Final Project Grading: ● A project is considered satisfactory if it meets all core requirements and milestones
36. 36. Introduction to Final Project Milestones: 1. Project Proposal / Wireframes ○ Week 5 -- Monday, December 16, 2013 2. Pseudo Code ○ Week 7 -- Monday, January 13, 2014 3. First Draft ○ Week 8 -- Wednesday, January 22, 2014
37. 37. Introduction to Final Project Target Dates: 1. Session 19 | Project Lab ○ Monday, February 3, 2014 2. Session 20 | Presentations ○ Wednesday, February 5, 2014
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