### Jquery Mobile - Single Page Structure

We have been introduced to Jquery Mobile and have also seen some of the key features of the rich web framework in the previous posts. Today we will take a look at a general page structure using Jquery Mobile. So be ready to start off programming using Jquery Mobile.

The Jquery Mobile page structure is optimized to support a single page or local, internally linked multiple pages. What does this mean? Well, single page architecture means, having multiple pages that are linked to each other using the normal process of using the anchor tag. So, each page will have its own header, content and footer. The multiple page structure is basically having multiple pages in one single page within different DIVs. So each page becomes a DIV which is linked to another page using an id for that particular page DIV.

The multiple page architecture, though available is not popularly used because it results in a performance issue. The DOM becomes heavy as multiple pages load at the same time and the website becomes sloppy for the user. The multiple page architecture can be used for websites which are only content based with just 4-5 pages in it. However, for a decent enough website or an application, using the single page architecture makes more sense.

If the above 2 paragraphs have not made any sense to you, do not get discouraged, take a look at the following to examples, and things will become much more clear.

Example #1:
The following example shows a general structure of a page using Jquery Mobile. Take a look at the example, the code the result and I will explain the components of the code in further detail.

You must have already taken a look at the example above. Let's begin with the important parts of the code first.
• The HTML5 doctype - The HTML5 doctype has to be used to extract the maximum out of this framework. Any device with a browser that does not understand the HTML5 doctype ignores the doctype and custom Jquery Mobile attributes.
• The viewport meta tag - The viewport meta tag tells the browser how the page zoom levels and dimensions are to be displayed. By setting the viewport attributes to content="width=device-width, initial-scale=1", the width will be set to the pixel width of the device screen. Now here, we are faced with an obvious question?
• What happens if the viewport meta tag is not included?
• In one line; your page would look bad. If the meta tag isn't set, many mobile browsers will use a "virtual" page width around 900 pixels to make it work well with existing desktop sites but the screens may look zoomed out and too wide.
• However, there is a problem with the usage of this meta tag. The page still can be zoomed, and though Jquery Mobile says its a feature, many a times it is not desirable. To restrict the zooming of the browser, we need to use a more better and refined meta tag, the details of which you will find in this post.
• Links to Jquery Mobile style-sheet and javascript files and the jquery javascript file.
Let's come to the body of the code. You would have observed a few things like "data-role=page", "data-role=header", "data-role=content" and "data-role=footer". Inside the  tag, each view or "page" on the mobile device is identified with an element (usually a div) with the data-role="page" attribute. Although the page structure outlined above is a recommended approach for a standard web app built with jQuery Mobile, the framework is very flexible with document structure. The page, header, content, and footer data-role elements are optional and are mostly helpful for providing some basic formatting and structure.

UPDATE: The following example makes use of the next stable version of Jquery Mobile 1.3.1

Here, we conclude our today's discussion on the Jquery Mobile Single Page structure. We would discuss the Multi-page structure in the further post. Including the multi-page structure in this post would make the post really lengthy and hence we will discuss this in the next post. Do let me know, if you have followed the post and also if you haven't, of any mistakes that you would have come across in this post.

Hope you enjoy coding using Jquery Mobile and share this post if you have liked it. You can also follow the blog on Facebook by liking the Spatial Unlimited page.

### Geodesic Polyline

Today we will have a look at a very interesting polyline example - "The geodesic polyline". Now the first question that will pop is "What is geodesic?". Mathematically, geodesic means the shortest line between two points on a mathematically defined surface, as a straight line on a plain or an arc of a great circle or sphere.

The next question after reading the above definition is clearly, "Why do we need geodesic polylines?" and that would be followed up with "What is this Great Circle?". We will discuss this first, before we move on to the actual example today. The example is very very similar to the normal polyline example, with just a small change.

Having said so, I will now try to explain why we need a geodesic polyline? The shortest distance between two locations on the earth is rarely a straight line as the earth is roughly spherical in nature. So any two points on the earth, even if they are very close lie on a curve and not …

### Difference between word-break: break-all versus word-wrap: break-word

The 2 CSS properties word-break: break-all and word-wrap: break-word appear to work in the same way or generate the same output, but there is a slight difference between the 2 and we will be discussing these differences today.

Take a look at the example above. The difference is quite evident, however I will try to explain it further.

word-break: break-all Irrespective of whether it’s a continuous word or many words, break-all breaks them up at the edge of the width limit even within the characters of the same word
word-wrap: break-word This will wrap long words onto the next line.break-word adjusts different words so that they do not break in the middle.
So if you have many fixed-size spans which get content dynamically, you might just prefer using word-wrap: break-word, as that way only the continuous words are broken in between, and in case it’s a sentence comprising many words, the spaces are adjusted to get intact words (no break within a word).     In case you want to exp…

### Where does Google get it's live traffic data from?

Referring to a post that I wrote earlier, Google’s - Live traffic Layer, ever wondered how Google collected this data? I was wondering the other day, how Google received live data to display it on their maps as a layer! I looked up the web and found something very interesting and am sharing the same with you all.As we all know, the traffic layer is available most accurately in several states in USA. Most major metro areas in the US have sensors embedded in their highways. These sensors track real time traffic data. Easy to miss at high speeds (hopefully anyway, traffic permitting), more commonly noticed may be the similar sensors that often exist at many busy intersections that help the traffic lights most efficiently let the most amount of people through. The information from these tracking sensors is reported back to the Department of Transportation (DOT). The DOT uses this data to update some of the digital signs that report traffic conditions in many metro areas. They also…

### jQuery Mobile's Next Big Step

Spatial Unlimited changes to The UI Dev

After being hosted on blogger 😣 for the last 6 years 📆, this page has finally been moved to Github.io
This means a few things for you, dear reader!

You will be redirected to the new page shortly! ⏩ ⏩ ⏩

Once crapy HTML is now better looking Markdown! 😍 😍

The entire blog is a Github repo! 😍 😍

Spatial Unlimited is now The UI Dev 😍 😍

### Ground Truth - How Google Builds Maps

Todays's article is cross posted from The Atlantic's Tech section. The article was posted by Alexis Madrigal who is a senior editor at The Atlantic, where he oversees the Technology channel. So, thanks to The Atlantic and Alexis Madrigal, we will have an exclusive look inside Ground Truth, the secretive program to build the world's best accurate maps.

Behind every Google Map, there is a much more complex map that's the key to your queries but hidden from your view. The deep map contains the logic of places: their no-left-turns and freeway on-ramps, speed limits and traffic conditions. This is the data that you're drawing from when you ask Google to navigate you from point A to point B -- and last week, Google showed me the internal map and demonstrated how it was built. It's the first time the company has let anyone watch how the project it calls GT, or "Ground Truth," actually works.
Google opened up at a key moment in its evolution. The co…