Ajax assignment help
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The document provides an overview of AJAX as a web development technique that enhances interactivity in web applications through asynchronous communication with the server using technologies like JavaScript, XML, and CSS. It details how AJAX allows for background data fetching without full page reloads, outlines the components and steps involved in AJAX operations, and discusses security considerations and potential issues associated with AJAX-based applications. Additionally, the document promotes assignment help and tutoring services offered by Global Web Tutors for various subjects, including AJAX.
Ajax assignment help
- 1. AJAX ASSIGNMENT HELP + 1-646-513-2712 +61-280363121 http://www.globalwebtutors.com
- 2. WHAT IS AJAX ? AJAX, is a web development technique for creating interactive web applications. AJAX stands for Asynchronous JavaScript and XML. AJAX is a new technique for creating better, faster, and more interactive web applications with the help of XML, HTML, CSS, and Java Script. Ajax uses XHTML for content, CSS for presentation, along with Document Object Model and JavaScript for dynamic content display. Conventional web applications transmit information to and from the sever using synchronous requests. It means you fill out a form, hit submit, and get directed to a new page with new information from the server.
- 3. WHAT IS AJAX (CONT.)? With AJAX, when you hit submit, JavaScript will make a request to the server, interpret the results, and update the current screen. In the purest sense, the user would never know that anything was even transmitted to the server. XML is commonly used as the format for receiving server data, although any format, including plain text, can be used. AJAX is a web browser technology independent of web server software. A user can continue to use the application while the client program requests information from the server in the background. Intuitive and natural user interaction. Clicking is not required, mouse movement is a sufficient event trigger. Data-driven as opposed to page-driven.
- 4. AJAX IS BASED ON OPEN STANDARDS Browser-based presentation using HTML and Cascading Style Sheets (CSS). Data is stored in XML format and fetched from the server. Behind-the-scenes data fetches using XMLHttpRequest objects in the browser. JavaScript to make everything happen.
- 6. AJAX TECHNOLOGIES JavaScript - Loosely typed scripting language. - JavaScript function is called when an event occurs in a page. - Glue for the whole AJAX operation. DOM - API for accessing and manipulating structured documents. - Represents the structure of XML and HTML documents. CSS - Allows for a clear separation of the presentation style from the content and may be changed programmatically by JavaScript.
- 7. AJAX BROWER SUPPORT Mozilla Firefox 1.0 and above. Netscape version 7.1 and above. Apple Safari 1.2 and above. Microsoft Internet Explorer 5 and above. Konqueror. Opera 7.6 and above.
- 8. BROWSER SPECIFIC CODE <html> <body> <script language="javascript" type="text/javascript"> <!-- //Browser Support Code function ajaxFunction(){ var ajaxRequest; // The variable that makes Ajax possible! try{ // Opera 8.0+, Firefox, Safari ajaxRequest = new XMLHttpRequest(); }catch (e){ // Internet Explorer Browsers try{ ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP"); }catch (e) { try{ ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP"); }catch (e){ // Something went wrong alert("Your browser broke!"); return false; } } } } //--> </script> <form name='myForm'> Name: <input type='text' name='username' /> <br /> Time: <input type='text' name='time' /> </form> </body> </html>
- 9. STEPS OF AJAX OPERATION A client event occurs. An XMLHttpRequest object is created. The XMLHttpRequest object is configured. The XMLHttpRequest object makes an asynchronous request to the Webserver. The Webserver returns the result containing XML document. The XMLHttpRequest object calls the callback() function and processes the result. The HTML DOM is updated.
- 10. AJAX SECURITY CLIENT SIDE SERVER SIDE AJAX-based Web applications use the same server-side security schemes of regular Web applications. You specify authentication, authorization, and data protection requirements in your web.xml file or in your program (programmatic). AJAX-based Web applications are subject to the same security threats as regular Web applications. JavaScript code is visible to a user/hacker. Hacker can use JavaScript code for inferring server-side weaknesses. JavaScript code is downloaded from the server and executed ("eval") at the client and can compromise the client by mal- intended code. Downloaded JavaScript code is constrained by the sand-box security model and can be relaxed for signed JavaScript.
- 11. ISSUES THAT WE DISCUSS Complexity is increased AJAX-based applications can be difficult to debug, test, and maintain Toolkits/Frameworks are not mature yet No standardization of the XMLHttpRequest yet No support of XMLHttpRequest in old browsers JavaScript technology dependency and incompatibility JavaScript code is visible to a hacker
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