Easy-to-follow video tutorials help you learn software, creative, and business skills.Become a member

Highlighting HTML5, CSS3, and JavaScript technologies

From: HTML5 Projects: Customized Photo Cards

Video: Highlighting HTML5, CSS3, and JavaScript technologies

Before we start the actual creation of the project, let's talk about each of the key technologies being used. There are four HTML5 or related technologies that are involved in creating this project: File API, drag and drop, localStorage, and canvas. Let's start by taking a closer look at File API. The File API allows you to interact with local files on the client side, something that's never been possible before. This means you can preprocess files that are being uploaded, which in turn means that we can show thumbnails of files, limit the upload by file size or type, and even show a progress bar.

Highlighting HTML5, CSS3, and JavaScript technologies

Before we start the actual creation of the project, let's talk about each of the key technologies being used. There are four HTML5 or related technologies that are involved in creating this project: File API, drag and drop, localStorage, and canvas. Let's start by taking a closer look at File API. The File API allows you to interact with local files on the client side, something that's never been possible before. This means you can preprocess files that are being uploaded, which in turn means that we can show thumbnails of files, limit the upload by file size or type, and even show a progress bar.

Moreover, you can also store files for offline work. There are three key related objects: File(), FileReader(), and the XMLHttpRequest() object. File, as you might imagine, provides information about the file itself, including name, file size, and MIME type. FileReader reads in and can display image data, like a thumbnail. It can also get and output file names. Moreover, it can work asynchronously, which is what makes progress bars possible.

The XMLHttpRequest() is now at a level 2 enhancement. And this is what provides client side functionality for transferring data to the server. Now, it doesn't go all the way. It still needs a little assist from a server-side technology like PHP. It does have pretty good browser support though, and I highly recommend that you go to caniuse.com, and check it out under File API. When you do, you will see that support is almost universal, and everybody is waiting for IE 10 to appear.

Next, let's look at drag and drop. Drag and drop is made up of HTML5 attributes, and a JavaScript API. The HTML attribute is dirt simple. To make an object draggable, all you need to do is put in the attribute draggable="true" within that object. There are seven different JavaScript events that are involved, everything from dragstart() to drop(). The key related object is called dataTransfer. It's typically set in the dragstart event and then read in the drop event.

This is what allows you to get information that is held within the object that is being dragged, and place it in the target. As you can see on caniuse.com, it's got really solid browser support. Now we turn to localStorage. localStorage you'll find is very straightforward to use, and it brings the ability for websites to keep track of a state without server-side coding. Unlike the cookie, it's stored in the browser cache and it has a much higher limit than cookies do.

It's basically a name/value pair structure that works with strings only. There are two simple commands, localStorage.setItem, which takes two arguments, the name of the item that you're setting, and its value; and localStorage.getItem only has one argument, and that's the name of the item that you are retrieving from storage. Really good browser support here. Caniuse.com refers to it as web storage. But you can actually search for it by localStorage. As you can see, it not only has current support, it's got a good deal of legacy support all the way back to Internet Explorer 8.

Finally, let's take a good, hard look at canvas. Canvas enables runtime graphics. So, rather than uploading in file image, you can create it on the fly. Both stroke and fill are independently supported, as are drawing basic primitives, such as lines, circles, and rectangles. You can also add text, and of course, bring in images. Perhaps its most powerful feature, however, is that it enables interactive graphic capabilities. And that's of great interest to designers who are looking for enhanced user experience options.

With canvas, you can combine layers of imagery, putting one photograph on top of another, you can apply graphic filters like a sepia tone, and you can allow the imagery to be manipulated, moving it, resizing it, rotating it, and so forth. And again, canvas has terrific browser support. But you can really use it today. It really looks like the UX Designer's toolbox got beefed up, doesn't it? And now, we're ready to put some of those shiny new tools to work, customizing photo cards.

Show transcript

This video is part of

Image for HTML5 Projects: Customized Photo Cards
HTML5 Projects: Customized Photo Cards

12 video lessons · 4887 viewers

Joseph Lowery
Author

 

Start learning today

Get unlimited access to all courses for just $25/month.

Become a member
Sometimes @lynda teaches me how to use a program and sometimes Lynda.com changes my life forever. @JosefShutter
@lynda lynda.com is an absolute life saver when it comes to learning todays software. Definitely recommend it! #higherlearning @Michael_Caraway
@lynda The best thing online! Your database of courses is great! To the mark and very helpful. Thanks! @ru22more
Got to create something yesterday I never thought I could do. #thanks @lynda @Ngventurella
I really do love @lynda as a learning platform. Never stop learning and developing, it’s probably our greatest gift as a species! @soundslikedavid
@lynda just subscribed to lynda.com all I can say its brilliant join now trust me @ButchSamurai
@lynda is an awesome resource. The membership is priceless if you take advantage of it. @diabetic_techie
One of the best decision I made this year. Buy a 1yr subscription to @lynda @cybercaptive
guys lynda.com (@lynda) is the best. So far I’ve learned Java, principles of OO programming, and now learning about MS project @lucasmitchell
Signed back up to @lynda dot com. I’ve missed it!! Proper geeking out right now! #timetolearn #geek @JayGodbold
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed HTML5 Projects: Customized Photo Cards.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Are you sure you want to delete this note?

No

Your file was successfully uploaded.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.