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Exploring highlighted HTML5, CSS3, and JavaScript technologies

From: HTML5 Projects: Advanced To-Do List

Video: Exploring highlighted HTML5, CSS3, and JavaScript technologies

Before we start the actual creation of the projects, let's talk about each of the key technologies being used. Across both projects, there are three HTML and related technologies that are being used: contenteditable, drag and drop, and localStorage, let's start with contenteditable. Basically, this feature makes any page area editable in the browser. It uses a single attribute, contenteditable of course, which can be set to equal to true, equal to false, used by itself, which means true or inherit, where we'll take on the contenteditable characteristics of its parent.

Exploring highlighted HTML5, CSS3, and JavaScript technologies

Before we start the actual creation of the projects, let's talk about each of the key technologies being used. Across both projects, there are three HTML and related technologies that are being used: contenteditable, drag and drop, and localStorage, let's start with contenteditable. Basically, this feature makes any page area editable in the browser. It uses a single attribute, contenteditable of course, which can be set to equal to true, equal to false, used by itself, which means true or inherit, where we'll take on the contenteditable characteristics of its parent.

Browser support for contenteditable is just totally off the charts. I was stunned when I looked this up. As you can see, support goes all the way back to Internet Explorer 7. This website, if you are not familiar with caniuse.com, is an essential tool for anyone who is working in HTML5 and related technologies to see what's possible in what browsers. Now let's take a look at drag and drop. There are two different aspects to drag and drop. There is a HTML5 attribute and there is a fairly robust JavaScript API.

On the HTML side we have one attribute called draggable, and it's very similar to contenteditable, in that it can be set to true, false, inherit or just inserted by itself without an equal sign, and if you do it that way it means that it is draggable. There are seven different JavaScript events everything from dragstart to drop. These are all used extensively in any drag and drop functionality. There is one key related object that I want to mention, and that's dataTransfer.

As the name implies, this is used to transfer the data from a dragged object. It is initially set in dragstart and then it is put in the drop event. There is pretty good browser support for drag and drop. Let's take a look at Can I use. As you can see, pretty much all the major players are in line with drag and drop although we are waiting for Internet Explorer 10 to come out. Finally, let's take a look at localStorage. LocalStorage is very straightforward to use for all that it does, and it does a really wonderful thing.

It brings the concept of state to websites without relying on server-side coding. And unlike cookie which is also used to convey states it is stored in the browser. It has a much larger limit than cookies, 5 megabytes versus 4 kilobytes, and it uses a very simple name value pair structure for strings only. Although there are a few other commands for localStorage, most of the time you'll be using these two, setItem and getItem.

SetItem takes two arguments; the first is the name of the item that you're setting and the second argument is its value. For getItem you only need the name. Browser support-wise we're pretty good. Let's take a look again at Can I use and I think we have as solid as support as we've seen for almost any other HTML5 technology. Overall I think the technologies involved in these projects are full-featured and pretty well supported across the browsers. So let's go build those projects.

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HTML5 Projects: Advanced To-Do List

13 video lessons · 9840 viewers

Joseph Lowery
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