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HTML5 Projects: Engaging Ecommerce

Saving list items


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HTML5 Projects: Engaging Ecommerce

with Joseph Lowery

Video: Saving list items

Local storage, or web storage, is another advanced technology under the HMTL5 umbrella that does a great job simply. Let me show you how easy it is to store items in the browser's local storage. So, we have our index.htm file opened, but we don't want to put the necessary code here. We're going to instead move it to dragdrop.js, since it is essentially dealing with the dropped items that we're going to save. So, the first thing I need to do is to declare a variable, and I'm going to put that right at the top of the page.

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HTML5 Projects: Engaging Ecommerce
37m 29s Intermediate Nov 06, 2012

Viewers: in countries Watching now:

The HTML5 Projects series combines HTML5, CSS3, and recent JavaScript API technologies to work—enhancing your web projects with interactivity and multimedia. This installment shows you how to build features that allow visitors to your online store to filter their selections interactively via sliders, drag items onto wish lists, and automatically save them locally. Author Joseph Lowery uses this scenario as an opportunity to introduce concepts such as HTML5 form elements with JavaScript enhancements, local content storage, and drag-and-drop.

Topics include:
  • Including range form elements
  • Modifying the display interactively
  • Establishing JavaScript functions
  • Dragging items to wish lists
  • Storing wish list items locally
  • Saving and retrieving list items
Subjects:
Web User Experience Ecommerce Web Design Projects
Software:
HTML JavaScript CSS
Author:
Joseph Lowery

Saving list items

Local storage, or web storage, is another advanced technology under the HMTL5 umbrella that does a great job simply. Let me show you how easy it is to store items in the browser's local storage. So, we have our index.htm file opened, but we don't want to put the necessary code here. We're going to instead move it to dragdrop.js, since it is essentially dealing with the dropped items that we're going to save. So, the first thing I need to do is to declare a variable, and I'm going to put that right at the top of the page.

So, I'll enter var, and I like to name my variables starting off with the article V. So, theFaves. And we're going to set that equal to document.getElemantById('faves');. Make sure to put that semicolon at the end. Now, what is the element ID faves? Let's go back to the HTML for just a sec. I'll scroll down to where my faves are. And here you see it's the ID in the unordered list. All right, let's had back to dragdrop.js, and now I'm going to move down the page.

And this is part of the drop event. So, after the item has been dropped, we want to call a custom function, and I'm going to put this call to the custom function above the evt.stopPropagation. So, let's make a little error here so we can see it clearly. And I'm just going to call this custom function saveFaves. All right! Now, we'll enter our new custom function below the binding. And so I'll enter a function, give it its custom name, put in a curly brace pair, and then just the single line in order for us to save the item to local storage.

So, we call localStorage.setItem and that's a capital I. And then in parentheses we have two arguments. The first is the item name that you're going to be saving. And I'm going to be calling it favorites, and then follow the argument with a comma. And now what is it that we are going to be saving into favorites? Well, we're going to go back our variable that we set up at the top of the page, theFaves, and we're going to pull in its inner HTML.

So, if you recall, theFaves was the unordered list and its inner HTML are all the list items. So, type in theFaves.innerHTML, and make sure to put a semicolon at the end. Now, with this code, we have grabbed and stored whatever is in the unordered list faves, and we can do this without worrying, because local storage has a much bigger limit than cookies do: 5 megabytes. So, let's save dragdrop.js, and now we're ready for final step: displaying the items from local storage.

And it's just as straightforward at storing them.

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