Creating QR and Tag Codes (Sams Teach Yourself -- Hours)
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Learn more about Amazon Prime. Please try your request again later. Phillip Dutson started down the path of geekdom at an early age when his father brought home a broken computer and helped him fix it up. Several years later he helped destroy and return to life a monochrome-display "laptop".
His education continued when he was given his first Palm Pilot and used it until the screen wore out. Having fallen absolutely head-over-heels in love with mobile devices he eventually traded up to a Palm Vx, a Cassiopeia, and then several rounds of smart-phones. He currently keeps a nice menagerie of both iOS and Android devices. With years of practical and personal experience, he has decided to share his knowledge to help everyone discover what they have been missing on the mobile front.
He is also a lead eCommerce and Front End Developer for one of the world's largest fitness manufacturers, and enjoys developing and creating all things related to the web. Are you an author? Help us improve our Author Pages by updating your bibliography and submitting a new or current image and biography. Learn more at Author Central. Other days I get paid to do what Episode 5 of The Full Stack is live! Episode 3 has been cut and dried and is ready for your digital consumption. Yes, you can do this manually, but when convienence presents itself you take the opportunity.
The developer podcast that I have been working on just went live with the first episode!
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The Full Stack covers web development from front-to-back, give it a listen. The Firefox OS App Manager is a new developer tool available in Firefox 26 that greatly improves the process of building and debugging Firefox OS … This was tweeted this morning by the amazing David Walsh, and yes, this really is amazingly awesome. Some excellent things to keep in mind while building your mobile eCommerce site. Android Tab Layout with Swipeable Views. Android Tab Layout with Swipeable Views: Android tutorial about implementing tab layout using fragments and viewpager with swiping gesture.
This article also gives you basic knowledge about using fragments and viewpager in your projects. The description above says it all, a good tutorial for Android. The destination of the link is passed to this tag as a parameter href: A hyperlink can contain images as well as, or instead of, text.
Look at this example: Here, a user can click on the image picfile. This ensures that all of our content is centered on the page. Its website is at http: Although it was never intended to become a desktop publishing tool, it does include some basic formatting attributes, such as font-size, align and the aforementioned bgcolor. The recommendation, which was updated in mid, enables web developers to separate the structure and format of their documents. The CSS recommendation describes the following three types of style sheets: A style assigned to a particular tag applies to all those tags in this type of document.
Each HTML tag receives its own style attributes as they occur in the page. Linked The style properties are stored in a separate file. Add a Little class 31 Even without all the formatting benefits that style sheets provide, web developers Did you can rejoice in knowing that using style sheets will no doubt be the biggest timesaver Know? Because you can apply style sheets to as many HTML documents as you like, making changes takes a matter of minutes rather than days.
Before the advent of style sheets, if you wanted to change the appearance of a particular tag in your website, you would have to open each document, find the tag you wanted to change, make the change, save the document, and continue on to the next document. With style sheets, you can change the tag in a single style sheet document and have the changes take effect immediately in all the pages linked to it. Defining the Rules Style sheet rules are made up of selectors the HTML tags that receive the style and declarations the style sheet properties and their values.
In the following example, the selector is the body tag and the declaration is made up of the style property background and its value black. This example sets the background color for the entire document to black. Declarations can contain more than one property. The following example also sets the text color for this page to white. Notice that the two properties are separated by a semicolon. Maybe you want every other h1 heading to be yellow on a white background. Let me introduce you to the class attribute. Applying Styles 33 Take a closer look at the style properties in Figure 2. The HTML tag name table is followed by a period.
You can see that the class name appears within quotations just like the other HTML attributes and as with the width attribute shown here. Remember, you have three methods to add style sheets: The styles defined here apply only to the one document in which they appear. If you plan to use these same styles in another document, you need to add them there as well.
You then link the file into each HTML document where you want those style properties to appear. Following are the entire contents of the mystyles. These are the same styles that showed up in the preceding embedded styles example, but now they appear in a separate text file. Look at the fol- lowing example.
I am still using the same style properties, as in the previous exam- ples, but now you can see how the two tables would be created using inline styles. Multiple style properties are still separated by semicolons, but the entire group of properties for each tag is grouped within each HTML tag. Cascading Precedence Web browsers give precedence to the style that appears closest to the tag. So, inline styles which appear as attributes within the tag itself are most important.
Embedded styles which appear at the top of the HTML file are applied next, and linked styles which appear in another file altogether are applied last. The browsers recognize that fact and change the style for that tag to reflect the inline style. Style sheet precedence is supposed to place more importance on embedded Watch styles than on linked style sheets. Internet Explorer and Netscape treat linked sheets as more important than embedded sheets but they do treat inline styles as more important than either of the other two.
Formatting Text with Styles Text is the most important element of any Web page. You can add your own style preferences to each of these tags using the style properties shown in Table 2. Microsoft maintains a brief tutorial for style sheets on its typography site http: The tutorial teaches Web page authors how style sheets can enhance their documents. This is impressive because of the many different styles and classes defined in this document.
You can see that you are only limited by your own imagination. You can see the page this style code created in Figure 2. Your best bet is to remember to test everything before you publish it. Webmaster Stop maintains a table of style sheet properties mapped to the most popular browsers. Check out this table http: Link Styles You have probably seen those bright blue underlined hyperlinks on the Web.
Style sheets have the following selectors to help you change the look of them: Did you One of the most popular style sheet effects on the Web right now is to remove Know? To do this on your pages, just add the text- decoration: Underlining is assumed for all a styles. Color Styles As you can see in Table 2. Not all colors work Watch together. Take a look at the following sample HTML.
Margin Styles Style sheets give you another important advantage: You can specify the margins of almost any HTML element. The margins can be defined in pt, in, cm, or px sizes. The Need for Ajax. The Constituent Parts of Ajax. Putting It All Together In this chapter you will learn about the individual building blocks of Ajax and how they fit together to form the architecture of an Ajax application. Subsequent chapters will examine these components in more detail, finally assembling them into a working Ajax application.
Creating Qr and Tag Codes: Phil Dutson, Phillip Dutson: irideryjawex.tk: Books
The Need for Ajax In the following parts of the book, we shall discuss each of the core components in detail. Traditional Versus Ajax Client-Server Interactions Chapter 1 discussed the traditional page-based model of a website user interface. When you interact with such a website, individual pages containing text, images, data entry forms, and so forth are presented one at a time. Each page must be dealt with individually before navigating to the next. For instance, you may complete the data entry fields of a form, editing and re-editing your entries as much as you want, knowing that the data will not be sent to the server until the form is finally submitted.
Page 1 Page 2 Page 3 Page 4 Browser Time After you submit a form or follow a navigation link, you then must wait while the browser screen refreshes to display the new or revised page that has been delivered by the server. As your experience as an Internet user grows, using this interface becomes almost second nature. First, there is a significant delay while each new or revised page is loaded. Furthermore, a whole page must be loaded on each occasion, even when most of its content is identical to that of the previous page. Items common to many pages on a website, such as header, footer, and navigation sections, can amount to a significant proportion of the data contained in the page.
This unnecessary download of data wastes bandwidth and further exacerbates the delay in loading each new page. By the Bandwidth refers to the capacity of a communications channel to carry informa- Way tion. On the Internet, bandwidth is usually measured in bps bits per second or in higher multiples such as Mbps million bits per second.
The Rich User Experience The combined effect of the issues just described is to offer a much inferior user expe- rience compared to that provided by the vast majority of desktop applications. On the desktop, you expect the display contents of a program to remain visible and the interface elements to respond to commands while the computing processes occur quietly in the background. As I write this chapter using a word processor, for exam- ple, I can save the document to disk, scroll or page up and down, and alter font faces and sizes without having to wait on each occasion for the entire display to be refreshed.
Ajax allows you to add to your web application interfaces some of this functionality more commonly seen in desktop applications and often referred to as a rich user experience. To achieve this, Ajax builds an extra layer of processing between the web page and the server. Anatomy of an Ajax Application This layer, often referred to as an Ajax Engine or Ajax Framework, intercepts requests from the user and in the background handles server communications quietly, unob- trusively, and asynchronously. By this we mean that server requests and responses no longer need to coincide with particular user actions but may happen at any time convenient to the user and to the correct operation of the application.
The browser does not freeze and await the completion by the server of the last request but instead lets the user carry on scrolling, clicking, and typing in the current page. The updating of page elements to reflect the revised information received from the server is also looked after by Ajax, happening dynamically while the page continues to be used. This application extends the familiar Google search engine interface to offer the user suggestions for suitable search terms, based on what he has so far typed.
Along with each suggested phrase is listed the number of results that would be expected for a search conducted using that phrase. At any point the user has the option to select one of these suggestions instead of continuing to type and have Google process the selected search. Because the server is queried with every keypress, this drop-down list updates dynam- ically as the user types—with no waiting for page refreshes or similar interruptions.
Your Ajax armory must therefore include a routine to monitor the status of a request and to act accordingly. Ajax applications care little about what languages or operating environments exist at the server; provided that the client-side Ajax layer receives a timely and correctly formatted HTTP response from the server, everything will work just fine. Ajax applications may make calls to various other server-side resources such as web services. Dealing with the Server Response Once notified that an asynchronous request has been successfully completed, you may then utilize the information returned by the server.
Depending on the nature of the application, you may then translate, display, or otherwise process this information within the current page. Examples include detecting error conditions and handling them appropriately, and keeping the user informed about the status of submitted Ajax requests.
You will see various examples in later chapters. Putting It All Together Suppose that you want to design a new Ajax application, or update a legacy web application to include Ajax techniques. How do you go about it? First you need to decide what page events and user actions will be responsible for causing the sending of an asynchronous HTTP request. You may decide, for exam- ple, that the action of moving the mouse cursor over an image will result in a request being sent to the server to retrieve further information about the subject of the picture, or that the clicking of a button will generate a server request for infor- mation with which to populate the fields on a form.
Summary 49 Ajax Frameworks While it is essential for a complete understanding of Ajax to understand what role each of the individual components plays, it is thankfully not necessary to rewrite all of your code for each new application.
Your Ajax code can be stored as a reusable library of common Ajax routines, ready to be reused wherever they may be needed. Summary This chapter discussed the shortcomings of the traditional web interface, identifying specific problems we want to overcome. We also introduced the various building blocks of an Ajax application and discussed how they work together. In the following chapters we shall look at these components in more detail, eventu- ally using them to build a complete Ajax application.
In this case, it tells the browser to combine the values into one string Way of text. If you use the plus sign between two numbers, they are added together. Adding the Script to a Web Page You should now have a complete script that calculates a result and displays it. Your listing should match Listing 4. If you add these tags to the document containing your script along with a descrip- tive heading, you should end up with something like Listing 4. By the Notepad and other Windows text editors might try to be helpful and add the.
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Functions take parameters the expression inside the parentheses to tell them what to do. Additionally, a function can return a value to a waiting variable. For exam- ple, the following function call prompts the user for a response and stores it in the text variable: This is useful for two main reasons: First, you can separate logical portions of your script to make it easier to understand. Second, and more importantly, you can use the function several times or with differ- ent data to avoid repeating script statements.
Loops are covered in detail in Chapter 8. You can also use scripts as event handlers. Although this might sound like a complex program- ming term, it actually means exactly what it says: Event handlers are scripts that handle events. In real life, an event is something that happens to you.
For example, images and text links have an event, onMouseOver, that happens when the mouse pointer moves over the object. Here is a typical HTML image tag with an event handler: This is an ideal use for functions because function names are short and to the point and can refer to a whole series of statements. Which Script Runs First? You can actually have several scripts within a web document: With all of these scripts, you might wonder how the browser knows which to execute first.
They are also useful for marking the major divisions of a script. Use a semicolon at the end of each statement, and only use one statement per line—This will make your scripts easier to debug.
These objects are organized into a tree-like structure, and represent all of the content and components of a web document. The objects in the DOM have properties—variables that describe the web page or doc- ument, and methods—functions that enable you to work with parts of the web page.
Since the release of Netscape 3. With more recent browser releases, a much more advanced DOM is supported. This is a standard that defines not only basic objects, but an entire set of objects that encompass all parts of an HTML document. A level 2 DOM standard has also been released, and level 3 is under development.
Fortunately, starting with Internet Explorer 5 and Netscape 6, both support the W3C DOM, so you can support both browsers with simple, standards-compliant code. The basic object hierarchy described in this chapter is informally referred to as DOM level 0, and the objects are included in the DOM level 1 standard. Working with Web Documents The document object represents a web document, or page. Because the window object always represents the current window the one containing the script , you can use window. You can also simply refer to document, which automatically refers to the current window.
The examples in earlier chapters only used a single window and docu- ment, so it was unnecessary to use window. Working with Web Documents 75 If multiple windows or frames are in use, there might be several window objects, each with its own document object. To use one of these document objects, you use the name of the window and the name of the document.
In the following sections, you will look at some of the properties and methods of the document object that will be useful in your scripting. Getting Information About the Document Several properties of the document object include information about the current doc- ument in general: This is a simple text field. If you need to send the user to a different location, use the window. This date is sent from the server along with the page.
As an example of a document property, Listing 5. You could also use the script to always print the current date instead of the last modified date, but that would be cheating. By the You might find that the document. The date is received from the web server, and some servers do not maintain modification dates correctly.
Writing Text in a Document The simplest document object methods are also the ones you will use most often. This statement is used whenever you need to include output in a web page. An alternative statement, document. This is handy when you want your text to be the last thing on the line. Watch Bear in mind that the newline character is displayed as a space by the browser, Out! You can use these methods only within the body of the web page, so they will be executed when the page loads.
You can write new content for a document, however, as the next section explains. You can also use it in a function, provided you include a call to the function within the body of the document. Using Links and Anchors Another child of the document object is the link object. Actually, there can be multi- ple link objects in a document. Each one includes information about a link to another location or an anchor. Did you You define them with a tag like this: You can then link to Know? You can access link objects with the links array.
Each member of the array is one of the link objects in the current page. A property of the array, document. Each link object or member of the links array has a list of properties defining the URL. The href property contains the entire URL, and other properties define portions of it. These are the same properties as the location object, defined later in this chapter. You can refer to a property by indicating the link number and property name. For example, the following statement assigns the entire URL of the first link to the vari- able link1: Each anchor object rep- resents an anchor in the current document—a particular location that can be jumped to directly.
Like links, you can access anchors with an array: Each element of this array is an anchor object. The book writing process was a fantastic one that was full of late nights, last minute changes, and lots of testing. Creating QR and Tag Codes. This is an amazing book of recipes that you can use to get the gist of a particular jQuery function, or an actual snippet of code that you can use in your current projects.
For those of you wailing on a bout superstition, know that yes, this will break the themes you generated with ThemeRoller. Now for the good news, you can import your old theme into the updated ThemeRoller and convert it to work with jQM 1. This is a wonderful addition as instead of having them disappear and then reappear in jumpy fashion on Android , they will stick now. Page transitions also have gone through a bit of a lift.
It was cool, it worked, and then when I used it in a PhoneGap application, it was way to laggy to be useful. For those who prefer a local copy to work with, here is a link to the download page. Big thumbs up to the jQM team and congrats on bringing out jQuery Mobile 1. This is a phenomenal update to the already stellar jQuery Mobile platform. Along with the update, the homepage of jquerymobile.
This is powered by Codiqa and is not only entertaining, but extremely awesome and easy to use. While this is mainly an announcement and I have glossed over pretty much everything, you should head over to the official blog post and check out all the goodies. The time has finally arrived! Those of you with a subscription get to reading it and feel free to give me some feedback so that I can make sure that it meets the needs of the masses!
Those without a subscription can still pre-purchase the book and get access to the Rough Cut today! Just visit the site and then click on the purchase options tab to get started on your copy.