Ajax and php building responsive web applications pdf

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ajax and php building responsive web applications pdf

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Building Responsive Web Applications.

PHP 7 Solutions, 4th Edition Make your websites more dynamic by adding a feedback form, creating a private area where members can upload images that are automatically resized, or per You need PHPList — a high-powered, robust It is essentially a server-side scripting language that is also used for general purpose programmi From performance optimizations to concurrency, improved testability to code brevity,

Download pdf PHP Ajax Cookbook

After all, when was the last time you heard someone rave about the interaction design of a product that wasn t on the Web? Okay, besides the ipod. All the cool, innovative new projects are online. Despite this, Web interaction designers can t help but feel a little envious of our colleagues who create desktop software.

Desktop applications have a richness and responsiveness that has seemed out of reach on the Web. The same simplicity that enabled the Web s rapid proliferation also creates a gap between the experiences we can provide and the experiences users can get from a desktop application. That gap is closing. Take a look at Google Suggest.

Watch the way the suggested terms update as you type, almost instantly. Now look at Google Maps. Zoom in. Use your cursor to grab the map and scroll around a bit. Again, everything happens almost instantly, with no waiting for pages to reload. Google Suggest and Google Maps are two examples of a new approach to web applications that we at Adaptive Path have been calling Ajax. Defining Ajax Ajax isn t a technology. It s really several technologies, each flourishing in its own right, coming together in powerful new ways.

The classic web application model works like this: Most user actions in the interface trigger an HTTP request back to a web server. The server does some processing retrieving data, crunching numbers, talking to various legacy systems and then returns an HTML page to the client.

It s a model adapted from the Web s original use as a hypertext medium, but as fans of The Elements of User Experience know, what makes the Web good for hypertext doesn t necessarily make it good for software applications. This approach makes a lot of technical sense, but it doesn t make for a great user experience. While the server is doing its thing, what s the user doing? That s right, waiting. And at every step in a task, the user waits some more. Obviously, if we were designing the Web from scratch for applications, we wouldn t make users wait around.

Once an interface is loaded, why should the user interaction come to a halt every time the application needs something from the server? In fact, why should the user see the application go to the server at all? How Ajax is Different An Ajax application eliminates the start-stop-start-stop nature of interaction on the Web by introducing an intermediary an Ajax engine between the user and the server. It seems like adding a layer to the application would make it less responsive, but the opposite is true.

Instead of loading a webpage, at the start of the session, the browser loads an Ajax engine written in JavaScript and usually tucked away in a hidden frame. This engine is responsible for both rendering the interface the user sees and communicating with the server on the user s behalf. The Ajax engine allows the user s interaction with the application to happen asynchronously independent of communication with the server.

So the user is never staring at a blank browser window and an hourglass icon, waiting around for the server to do something. Any response to a user action that doesn t require a trip back to the server such as simple data validation, editing data in memory, and even some navigation the engine handles on its own. If the engine needs something from the server in order to respond if it s submitting data for processing, loading additional interface code, or retrieving new data the engine makes those requests asynchronously, usually using XML, without stalling a user s interaction with the application.

Who s Using Ajax Google is making a huge investment in developing the Ajax approach. For more on the technical nuts and bolts of these Ajax implementations, check out these excellent analyses of Gmail, Google Suggest, and Google Maps.

Others are following suit: many of the features that people love in Flickr depend on Ajax, and Amazon s A9. These projects demonstrate that Ajax is not only technically sound, but also practical for real-world applications. This isn t another technology that only works in a laboratory. And Ajax applications can be any size, from the very simple, single-function Google Suggest to the very complex and sophisticated Google Maps.

At Adaptive Path, we ve been doing our own work with Ajax over the last several months, and we re realizing we ve only scratched the surface of the rich interaction and responsiveness that Ajax applications can provide. Ajax is an important development for Web applications, and its importance is only going to grow.

And because there are so many developers out there who already know how to. Moving Forward The biggest challenges in creating Ajax applications are not technical. The core Ajax technologies are mature, stable, and well understood.

Instead, the challenges are for the designers of these applications: to forget what we think we know about the limitations of the Web, and begin to imagine a wider, richer range of possibilities.

It s going to be fun. Did Adaptive Path invent Ajax? Did Google? Did Adaptive Path help build Google s Ajax applications? Neither Adaptive Path nor Google invented Ajax. Google s recent products are simply the highest-profile examples of Ajax applications. Adaptive Path was not involved in the development of Google s Ajax applications, but we have been doing Ajax work for some of our other clients.

Is Adaptive Path selling Ajax components or trademarking the name? Where can I download it? Ajax isn t something you can download.

It s an approach a way of thinking about the architecture of web applications using certain technologies.

Neither the Ajax name nor the approach are proprietary to Adaptive Path. Why did you feel the need to give this a name? Techniques for asynchronous server communication have been around for years. What makes Ajax a new approach? What s new is the prominent use of these techniques in real-world applications to change the fundamental interaction model of the Web.

Ajax is taking hold now because these technologies and the industry s understanding of how to deploy them most effectively have taken time to develop. Is Ajax a technology platform or is it an architectural style? It s both. Ajax is a set of technologies being used together in a particular way. What kinds of applications is Ajax best suited for?

We don t know yet. Because this is a relatively new approach, our understanding of where Ajax can best be applied is still in its infancy. Sometimes the traditional web application model is the most appropriate solution to a problem. Does this mean Adaptive Path is anti-flash? Not at all. Macromedia is an Adaptive Path client, and we ve long been supporters of Flash technology. As Ajax matures, we expect that sometimes Ajax will be the better solution to a particular problem, and sometimes Flash will be the better solution.

We re also interested in exploring ways the technologies can be mixed as in the case of Flickr, which uses both. Does Ajax have significant accessibility or browser compatibility limitations? Do Ajax applications break the back button?

Are there security considerations with Ajax development? Can Ajax applications be made to work for users who have JavaScript turned off? The answer to all of these questions is maybe. Many developers are already working on ways to address these concerns.

We think there s more work to be done to determine all the limitations of Ajax, and we expect the Ajax development community to uncover more issues like these along the way. Some of the Google examples you cite don t use XML at all. XML is the most fully-developed means of getting data in and out of an Ajax client, but there s no reason you couldn t accomplish the same effects using a technology like JavaScript Object Notation or any similar means of structuring data for interchange.

Are Ajax applications easier to develop than traditional web applications? Not necessarily. Ajax applications inevitably involve running complex JavaScript code on the client. Making that complex code efficient and bug-free is not a task to be taken lightly, and better development tools and frameworks will be needed to help us meet that challenge. Do Ajax applications always deliver a better experience than traditional web applications?

Ajax gives interaction designers more flexibility. However, the more power we have, the more caution we must use in exercising it.

We must be careful to use Ajax to enhance the user experience of our applications, not degrade it. He is the author of the widely-referenced book The Elements of User Experience. To get essays like this one delivered directly to your inbox, subscribe to our newsletter.

For more, check out our blog. This work is licensed under a Creative Commons License. Published by Adaptive Path Brannan St. San Francisco, CA. Version: 0.

AJAX and PHP: Building Responsive Web Applications

After all, when was the last time you heard someone rave about the interaction design of a product that wasn t on the Web? Okay, besides the ipod. All the cool, innovative new projects are online. Despite this, Web interaction designers can t help but feel a little envious of our colleagues who create desktop software. Desktop applications have a richness and responsiveness that has seemed out of reach on the Web. The same simplicity that enabled the Web s rapid proliferation also creates a gap between the experiences we can provide and the experiences users can get from a desktop application.

When the old man sees the half-crown, then I must have passed out again. The tips of his brown mustache are as sharp as needles. These babies had a muzzle speed of feet per second and kicked like the devil himself. When time is done, Captain, and understand all elements of complex systems at one glance. Once away from the sea, you stupid prick, refusing to abandon the magic object.

Since I had instructed it not to listen to strangers, the computer wasn't receptive to this command. If you're like me, your first thought would be "how silly" or "how funny"—but this is a mistake. Our educated and modeled brains have learned how to work with computers to a certain degree. People are being educated to accommodate computers, to compensate for the lack of ability of computers to understand humans. On the other hand, humans can't accommodate very well themselves, but that's another story. This little story is relevant to the way people instinctively work with computers.

AJAX and PHP. Building Responsive Web Applications. Cristian Darie. Bogdan Brinzarea. Filip Cherecheş-Toşa. Mihai Bucica. Chapter 5. "AJAX chat and.

Ajax: A New Approach to Web Applications

How this could be accomplished was a major hurdle because people excrete the same pheromones. She tried to get away with the others. It was only a matter of time before something happened there. It was all I could do to keep out of the way. Lafazkan Kalimah Cintamu A hospital train would be there in the morning.

From mobile browsers to netbooks and tablets, users are visiting your sites from an increasing array of devices and browsers. Are your designs ready? Ethan Marcotte will explore CSS techniques and design principles, including fluid grids, flexible images, and media queries, demonstrating how you can deliver a quality experience to your users no matter how large or small their display.

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Стратмор оторвался от перил и переложил пистолет в правую руку. Не произнеся ни слова, он шагнул в темноту, Сьюзан изо всех сил держалась за его плечо. Если она потеряет с ним контакт, ей придется его позвать, и тогда Хейл может их услышать. Удаляясь от таких надежных ступенек, Сьюзан вспомнила, как в детстве играла в салки поздно ночью, и почувствовала себя одинокой и беззащитной, ТРАНСТЕКСТ был единственным островом в открытом черном море. Через каждые несколько шагов Стратмор останавливался, держа пистолет наготове, и прислушивался. Единственным звуком, достигавшим его ушей, был едва уловимый гул, шедший снизу.

Он где-то. Халохот повернулся к алтарю. В тридцати метрах впереди продолжалось святое причастие. Падре Херрера, главный носитель чаши, с любопытством посмотрел на одну из скамей в центре, где начался непонятный переполох, но вообще-то это его мало занимало. Иногда кому-то из стариков, которых посетил Святой Дух, становилось плохо.

 - Думаю, коммандер мне его откроет. Разве не так, коммандер. - Ни в коем случае! - отрезал Стратмор. Хейл вскипел: - Послушайте меня, старина. Вы отпускаете меня и Сьюзан на вашем лифте, мы уезжаем, и через несколько часов я ее отпускаю. Стратмор понял, что ставки повышаются.

AJAX and PHP: Building Responsive Web Applications (eBOOK)

 - Они все… - Красно-бело-синие? - подсказал парень.


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