Enterprise AJAX: Strategies for Building High Performance by David C. Johnson, Alexei White, Andre Charland

By David C. Johnson, Alexei White, Andre Charland

Writing for company builders, architects, and person interface experts, the authors clarify why AJAX bargains such nice promise in large-scale improvement. subsequent, they systematically introduce brand new key AJAX options and elements. you will stroll via constructing frameworks for development AJAX functions that mix information tables, net types, charts, seek, and filtering: the very structures companies depend upon in CRM, ERP, BI, and past. Then, development in this robust starting place, the authors determine confirmed AJAX architectural styles, and current case stories drawn from real .NET and Java AJAX purposes. Coverge includes•Using AJAX to enforce Model-View-Controller (MVC) within the browser•Encapsulating consumer interface performance to facilitate code reuse and decrease cross-browser improvement problems•Overcoming the original safeguard demanding situations linked to AJAX internet applications•Optimizing AJAX usability: the "back" button, caching, bookmarking, offline utilization, and beyondFrom safeguard to scalability to undertaking chance, this can be the one booklet to hide the entire concerns dealing with AJAX builders within the firm. even if you are migrating legacy HTML interfaces or construction new purposes from scratch, you will discover it completely crucial.

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Any investment in a new technology must be justified along these guidelines. As developers, you need to be mindful of the drivers for adoption of AJAX in the enterprise if you are to be successful at developing enterprise-quality software. Usability Although it’s clear that AJAX is first and foremost a tool for user experience, we still haven’t explained why this is so important. Does it actually matter if our software is nicer to use? How large or small is the user experience opportunity? “I estimate that low intranet usability costs the world economy $100 billion per year in lost employee productivity”—Dr.

SetInterval(poll, 1000); // call poll function every second Error Handling Another important and fairly standard aspect of programming for most developers is handling errors. JavaScript has similar support for error handling as the Java or C# languages. Just like these server-side languages, JavaScript provides the same sort of try / catch / finally statement blocks. Any code that poses a high risk for an unknown error to occur, such as when using the XMLHttpRequest object, can be contained inside a try block; when an error is thrown, either by the JavaScript engine or explicitly in the code through a throw statement, the script execution jumps ahead to the catch block.

The script that binds—Or ECMA Script (Standard ECM A- 262), is the unifying AJAX technology. JavaScript is a scripting language supported in all major web browsers and provides developers with programmatic access to the XHR object and the DOM API. 6. What About the Applicatioin? 19 class AJAX HTTP Browser JavaScript DOM XHTML CSS XML JSON Server PHP, Java,. 6 The Various AJAX Technologies Across the Browser and Server Programming Patterns Like the UI design patterns previously discussed, many important programming design patterns might be familiar to you.

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