{"id":16,"date":"2007-03-19T23:27:21","date_gmt":"2007-03-20T05:27:21","guid":{"rendered":"http:\/\/blog.supportpro.com\/?p=16"},"modified":"2026-05-29T01:17:52","modified_gmt":"2026-05-29T07:17:52","slug":"ajax-and-atlas","status":"publish","type":"post","link":"https:\/\/www.supportpro.com\/blog\/ajax-and-atlas\/","title":{"rendered":"AJAX Explained: How Asynchronous Web Applications Work"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Modern web applications are expected to be fast, responsive, and interactive. Users no longer want pages to reload every time they submit a form or request data from a server. This is where AJAX becomes important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX, which stands for Asynchronous JavaScript and XML, allows web applications to exchange data with a server in the background without refreshing the entire page. This technology helps developers create smoother and more user-friendly applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this blog, we\u2019ll explain what AJAX is, how it works, the role of the XMLHttpRequest object, and how AJAX improves web application performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is AJAX?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX stands for <strong>Asynchronous JavaScript and XML<\/strong>. It is not a programming language but a technique used to build dynamic and interactive web applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX became popular through applications like Google Suggest, where search suggestions appear instantly while the user types.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With AJAX, JavaScript communicates directly with the server using HTTP requests. This allows web pages to update small portions of content without reloading the complete page.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Technologies Used in AJAX<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX combines several web technologies, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>JavaScript<\/li>\n\n\n\n<li>HTML\/XHTML<\/li>\n\n\n\n<li>CSS<\/li>\n\n\n\n<li>XML<\/li>\n\n\n\n<li>HTTP Requests<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These technologies work together to improve the responsiveness of web applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Benefits of AJAX<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX offers several advantages for modern web development:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faster page updates<\/li>\n\n\n\n<li>Reduced server load<\/li>\n\n\n\n<li>Better user experience<\/li>\n\n\n\n<li>Background data processing<\/li>\n\n\n\n<li>No full-page reloads<\/li>\n\n\n\n<li>Improved responsiveness<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because only specific data is transferred instead of an entire webpage, applications become more efficient and interactive.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How AJAX Works<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX works through the JavaScript <code>XMLHttpRequest<\/code> object. This object allows the browser to communicate with the server asynchronously.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The process works as follows:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>A user performs an action on the webpage<\/li>\n\n\n\n<li>JavaScript creates an HTTP request<\/li>\n\n\n\n<li>The request is sent to the server<\/li>\n\n\n\n<li>The server processes the request<\/li>\n\n\n\n<li>The response is returned to the browser<\/li>\n\n\n\n<li>JavaScript updates the webpage dynamically<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">All of this happens without refreshing the page.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">AJAX Browser Support<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Most modern browsers support AJAX through the <code>XMLHttpRequest<\/code> object.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Older versions of Internet Explorer used <code>ActiveXObject<\/code>, while modern browsers use the built-in <code>XMLHttpRequest<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Example: Creating an XMLHttpRequest Object<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script type=\"text\/javascript\"&gt;\nfunction ajaxFunction()\n{\n    var xmlHttp;\n\n    try\n    {\n        xmlHttp = new XMLHttpRequest();\n    }\n    catch (e)\n    {\n        try\n        {\n            xmlHttp = new ActiveXObject(\"Msxml2.XMLHTTP\");\n        }\n        catch (e)\n        {\n            try\n            {\n                xmlHttp = new ActiveXObject(\"Microsoft.XMLHTTP\");\n            }\n            catch (e)\n            {\n                alert(\"Your browser does not support AJAX!\");\n                return false;\n            }\n        }\n    }\n}\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Understanding AJAX Properties<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. onreadystatechange<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>onreadystatechange<\/code> property stores the function that processes the server response.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>xmlHttp.onreadystatechange=function()\n{\n    \/\/ Process server response here\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. readyState<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>readyState<\/code> property represents the current status of the request.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><div class=\"pcrstb-wrap\"><table class=\"has-fixed-layout\"><tbody><tr><th>State<\/th><th>Description<\/th><\/tr><tr><td>0<\/td><td>Request not initialized<\/td><\/tr><tr><td>1<\/td><td>Request setup completed<\/td><\/tr><tr><td>2<\/td><td>Request sent<\/td><\/tr><tr><td>3<\/td><td>Request processing<\/td><\/tr><tr><td>4<\/td><td>Request completed<\/td><\/tr><\/tbody><\/table><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>xmlHttp.onreadystatechange=function()\n{\n    if(xmlHttp.readyState==4)\n    {\n        \/\/ Response is ready\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. responseText<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>responseText<\/code> property retrieves data returned by the server.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>xmlHttp.onreadystatechange=function()\n{\n    if(xmlHttp.readyState==4)\n    {\n        document.myForm.time.value = xmlHttp.responseText;\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Sending Requests with AJAX<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX uses the <code>open()<\/code> and <code>send()<\/code> methods to communicate with the server.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Example<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>xmlHttp.open(\"GET\",\"time.asp\",true);\nxmlHttp.send(null);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Parameters used:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>GET<\/code> \u2013 HTTP request method<\/li>\n\n\n\n<li><code>time.asp<\/code> \u2013 Server-side script<\/li>\n\n\n\n<li><code>true<\/code> \u2013 Asynchronous request<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Simple AJAX Example<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Below is a basic AJAX form example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;html&gt;\n&lt;body&gt;\n\n&lt;form name=\"myForm\"&gt;\nName:\n&lt;input type=\"text\" onkeydown=\"ajaxFunction();\" name=\"username\" \/&gt;\n\nTime:\n&lt;input type=\"text\" name=\"time\" \/&gt;\n&lt;\/form&gt;\n\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">When the user types in the text field, AJAX sends a request to the server in the background and updates the time field dynamically.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Server-Side Script Example<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The server-side script returns the current server time.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">ASP Example<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;%\nresponse.write(time)\n%&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The returned value is stored in <code>responseText<\/code> and displayed on the webpage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why AJAX Matters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX changed the way web applications work by making them faster and more interactive. Instead of waiting for complete page reloads, users can interact with applications smoothly and receive instant updates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Today, AJAX concepts are widely used in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Search suggestions<\/li>\n\n\n\n<li>Live chat applications<\/li>\n\n\n\n<li>Online forms<\/li>\n\n\n\n<li>Social media feeds<\/li>\n\n\n\n<li>Real-time dashboards<\/li>\n\n\n\n<li>E-commerce platforms<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AJAX is a powerful technique that enables asynchronous communication between browsers and servers. By using JavaScript and the <code>XMLHttpRequest<\/code> object, developers can build responsive and user-friendly web applications without constantly reloading pages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding AJAX is essential for modern web development because it forms the foundation of many interactive web technologies used today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you require help, <a href=\"https:\/\/www.supportpro.com\/requestquote.php\">contact SupportPRO Server Admin<\/a><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><span id=\"hs-cta-wrapper-9d590242-d641-4383-94b4-8cfd62f0af6b\" class=\"hs-cta-wrapper\"><span id=\"hs-cta-9d590242-d641-4383-94b4-8cfd62f0af6b\" class=\"hs-cta-node hs-cta-9d590242-d641-4383-94b4-8cfd62f0af6b\"><a href=\"https:\/\/www.supportpro.com\/freecheckup.php\"><\/a><\/span><\/span><\/p>\n\n\n\n<div class=\"wp-block-media-text alignwide has-media-on-the-right is-stacked-on-mobile is-vertically-aligned-center has-white-background-color has-background\"><div class=\"wp-block-media-text__content\">\n<p class=\"has-large-font-size wp-block-paragraph\">Facing issues? <\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">Our technical support<br>engineers can solve it. <\/p>\n\n\n\n<!--HubSpot Call-to-Action Code --><span class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-3350a795-db50-482f-9911-301930d1b1be\"><span class=\"hs-cta-node hs-cta-3350a795-db50-482f-9911-301930d1b1be\" id=\"hs-cta-3350a795-db50-482f-9911-301930d1b1be\"><!--[if lte IE 8]><div id=\"hs-cta-ie-element\"><\/div><![endif]--><a href=\"https:\/\/cta-redirect.hubspot.com\/cta\/redirect\/2725694\/3350a795-db50-482f-9911-301930d1b1be\" ><img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-3350a795-db50-482f-9911-301930d1b1be\" style=\"border-width:0px;\" src=\"https:\/\/no-cache.hubspot.com\/cta\/default\/2725694\/3350a795-db50-482f-9911-301930d1b1be.png\"  alt=\"Contact Us today!\"\/><\/a><\/span><script charset=\"utf-8\" src=\"https:\/\/js.hscta.net\/cta\/current.js\"><\/script><script type=\"text\/javascript\"> hbspt.cta.load(2725694, '3350a795-db50-482f-9911-301930d1b1be', {\"useNewLoader\":\"true\",\"region\":\"na1\"}); <\/script><\/span><!-- end HubSpot Call-to-Action Code -->\n<\/div><figure class=\"wp-block-media-text__media\"><img fetchpriority=\"high\" decoding=\"async\" width=\"904\" height=\"931\" src=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup.png\" alt=\"guy server checkup\" class=\"wp-image-12943 size-full\" srcset=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup.png 904w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-291x300.png 291w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-768x791.png 768w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-585x602.png 585w\" sizes=\"(max-width: 904px) 100vw, 904px\" \/><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Modern web applications are expected to be fast, responsive, and interactive. Users no longer want pages to reload every time they submit a form or request data from a server.&hellip;<\/p>\n","protected":false},"author":4,"featured_media":17273,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-16","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general-topics"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Learn what AJAX is, how AJAX works using XMLHttpRequest, and how it improves web application speed, responsiveness, and user experience\" \/>\n\t<meta name=\"robots\" content=\"max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n\t<meta name=\"author\" content=\"SupportPRO Admin\"\/>\n\t<link rel=\"canonical\" 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