tailieunhanh - Publishing AJAX and PHP - part 1

AJAX là một hiện tượng phức tạp mà các phương tiện khác nhau đối với những người khác nhau. Người dùng máy tính đánh giá cao trang web ưa thích của họ bây giờ thân thiện và cảm thấy phản ứng nhanh hơn. Phát triển web học các kỹ năng mới mà trao quyền cho họ để tạo ra các ứng dụng web kiểu dáng đẹp với ít nỗ lực. | Preface AJAX is a complex phenomenon that means different things to different people. Computer users appreciate that their favorite websites are now friendlier and feel more responsive. Web developers learn new skills that empower them to create sleek web applications with little effort. Indeed everything sounds good about AJAX At its roots AJAX is a mix of technologies that lets you get rid of the evil page reload which represents the dead time when navigating from one page to another. Eliminating page reloads is just one step away from enabling more complex features into websites such as real-time data validation drag and drop and other tasks that weren t traditionally associated with web applications. Although the AJAX ingredients are mature the XMLHttpRequest object which is the heart of AJAX was created by Microsoft in 1999 their new role in the new wave of web trends is very young and we ll witness a number of changes before these technologies will be properly used to the best benefit of the end users. At the time of writing this book the AJAX name is about just one year old. AJAX isn t of course the answer to all the Web s problems as the current hype around it may suggest. As with any other technology AJAX can be overused or used the wrong way. AJAX also comes with problems of its own you need to fight with browser inconsistencies AJAX-specific pages don t work on browsers without JavaScript they can t be easily bookmarked by users and search engines don t always know how to parse them. Also not everyone likes AJAX. While some are developing enterprise architectures using JavaScript others prefer not to use it at all. When the hype is over most will probably agree that the middle way is the wisest way to go for most scenarios. In AJAX and PHP Building Responsive Web Applications we took a pragmatic and safe approach by teaching relevant patterns and best practices that we think any web developer will need sooner or later. We teach you how to avoid the .