Beginning building mobile application development in the by Richard Rodger

By Richard Rodger

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Figure 1-2 shows the app in action, running on desktop Safari, with the developer console open. indd 21 9/26/11 10:40:58 AM ❘ 22 CHAPTER 1 INTRODUCING CLOUD-BASED MOBILE APPS FIGURE 1-2 What do you need to do to create this app? You’ll put everything in one HTML page. You’ll need a square div tag to change color. You’ll need some JavaScript to generate random colors and change the color of the div tag when the user click or taps it. For now, you’ll just build the desktop version of this app. In the following section, you’ll learn how to view it on a mobile device.

DOCTYPE html> Using this document type declaration is the standard way to start an HTML5 web page. Next, you open the HTML fi le in the usual way, with the standard html and head tags. indd 23 9/26/11 10:40:59 AM 24 ❘ CHAPTER 1 INTRODUCING CLOUD-BASED MOBILE APPS The mobile device’s browser uses the viewport metatag to scale the page. When you visit a normal website on your mobile device, you use a two-finger pinch gesture to zoom in and out. This is not something you want to happen with your mobile app because it is not a website.

Modern web browsers include a special JSON utility object. stringify function converts a variable into a string containing the textual representation of the JSON encoding of the value of that variable. stringify(myobject) + “
”+ The last line of the statement closes the pre tag: “

” At the end are the closing HTML tags: Notice that the script tag in this example is not inside the head tag but rather inside the body tag. This means that the script tag code will run after the browser has prepared the DOM.

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