{"id":28588,"date":"2025-05-16T15:37:53","date_gmt":"2025-05-16T08:37:53","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=28588"},"modified":"2025-05-23T09:19:17","modified_gmt":"2025-05-23T02:19:17","slug":"ajax-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/ajax-la-gi\/","title":{"rendered":"AJAX l\u00e0 g\u00ec? L\u1ee3i \u00edch &#8211; H\u1ea1n ch\u1ebf &#038; C\u00e1c c\u00f4ng ngh\u1ec7 c\u1ea5u th\u00e0nh AJAX"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#AJAX-la-gi\" >AJAX l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Cach-hoat-dong-cua-AJAX\" >C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a AJAX<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Loi-ich-va-han-che-cua-AJAX\" >L\u1ee3i \u00edch v\u00e0 h\u1ea1n ch\u1ebf c\u1ee7a AJAX<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Loi-ich-chinh-cua-AJAX-la-gi\" >L\u1ee3i \u00edch ch\u00ednh c\u1ee7a AJAX l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Han-che-can-luu-y-cua-AJAX-la-gi\" >H\u1ea1n ch\u1ebf c\u1ea7n l\u01b0u \u00fd c\u1ee7a AJAX l\u00e0 g\u00ec?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Cac-cong-nghe-su-dung-trong-AJAX\" >C\u00e1c c\u00f4ng ngh\u1ec7 s\u1eed d\u1ee5ng trong AJAX<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#HTML-XHTML-va-CSS-Xay-dung-cau-truc-va-phong-cach\" >HTML, XHTML v\u00e0 CSS: X\u00e2y d\u1ef1ng c\u1ea5u tr\u00fac v\u00e0 phong c\u00e1ch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#XML\" >XML<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#XMLHttpRequest\" >XMLHttpRequest<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#DOM-Document-Object-Model\" >DOM (Document Object Model)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#JavaScript\" >JavaScript<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Truong-hop-ung-dung-ky-thuat-AJAX\" >Tr\u01b0\u1eddng h\u1ee3p \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt AJAX<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Google-Maps\" >Google Maps<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Facebook-Chat\" >Facebook Chat<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Amazon\" >Amazon<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Twitter\" >Twitter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Gmail\" >Gmail<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Tim-kiem-theo-thoi-gian-thuc-Autocomplete\" >T\u00ecm ki\u1ebfm theo th\u1eddi gian th\u1ef1c (Autocomplete)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#Cau-hoi-thuong-gap-ve-AJAX\" >C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 AJAX<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#AJAX-khac-gi-HTTP-thong-thuong\" >AJAX kh\u00e1c g\u00ec HTTP th\u00f4ng th\u01b0\u1eddng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#AJAX-co-thay-the-duoc-tai-trang-truyen-thong-khong\" >AJAX c\u00f3 thay th\u1ebf \u0111\u01b0\u1ee3c t\u1ea3i trang truy\u1ec1n th\u1ed1ng kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#AJAX-dung-giao-thuc-gi\" >AJAX d\u00f9ng giao th\u1ee9c g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#AJAX-co-lien-quan-den-JavaScript-khong\" >AJAX c\u00f3 li\u00ean quan \u0111\u1ebfn JavaScript kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/#AJAX-co-bao-mat-khong\" >AJAX c\u00f3 b\u1ea3o m\u1eadt kh\u00f4ng?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>B\u1ea1n c\u00f3 bao gi\u1edd th\u1eafc m\u1eafc t\u1ea1i sao c\u00e1c trang web hi\u1ec7n \u0111\u1ea1i l\u1ea1i m\u01b0\u1ee3t m\u00e0 v\u00e0 ph\u1ea3n h\u1ed3i nhanh \u0111\u1ebfn v\u1eady, c\u1eadp nh\u1eadt n\u1ed9i dung m\u00e0 kh\u00f4ng c\u1ea7n t\u1ea3i l\u1ea1i trang? B\u00ed m\u1eadt \u0111\u1eb1ng sau tr\u1ea3i nghi\u1ec7m tuy\u1ec7t v\u1eddi \u1ea5y ch\u00ednh l\u00e0 k\u1ef9 thu\u1eadt AJAX. AJAX kh\u00f4ng ch\u1ec9 gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 t\u1ea3i trang v\u00e0 gi\u1ea3m t\u1ea3i cho m\u00e1y ch\u1ee7, m\u00e0 c\u00f2n c\u00e1ch m\u1ea1ng h\u00f3a giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng web, bi\u1ebfn ch\u00fang th\u00e0nh c\u00e1c \u1ee9ng d\u1ee5ng t\u01b0\u01a1ng t\u00e1c cao.<\/p>\n<p>Trong b\u00e0i vi\u1ebft n\u00e0y, c\u00f9ng InterData t\u00ecm hi\u1ec3u t\u1eeb kh\u00e1i ni\u1ec7m <a href=\"https:\/\/interdata.vn\/blog\/ajax-la-gi\/\">AJAX l\u00e0 g\u00ec<\/a>, c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng, nh\u1eefng l\u1ee3i \u00edch, h\u1ea1n ch\u1ebf c\u1ee7a AJAX trong l\u1eadp tr\u00ecnh \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf ph\u1ed5 bi\u1ebfn c\u1ee7a AJAX. T\u00ecm hi\u1ec3u ngay!<\/p>\n<h2><span class=\"ez-toc-section\" id=\"AJAX-la-gi\"><\/span>AJAX l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>AJAX l\u00e0 ch\u1eef vi\u1ebft t\u1eaft c\u1ee7a Asynchronous JavaScript and XML &#8211; l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt l\u1eadp tr\u00ecnh web \u0111\u1ed9t ph\u00e1, cho ph\u00e9p c\u00e1c trang web giao ti\u1ebfp v\u1edbi m\u00e1y ch\u1ee7 m\u1ed9t c\u00e1ch b\u1ea5t \u0111\u1ed3ng b\u1ed9.<\/strong> \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 trang web c\u00f3 th\u1ec3 g\u1eedi v\u00e0 nh\u1eadn d\u1eef li\u1ec7u ng\u1ea7m m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9 trang, mang l\u1ea1i tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng m\u01b0\u1ee3t m\u00e0 h\u01a1n r\u1ea5t nhi\u1ec1u.<\/p>\n<p>V\u1ec1 b\u1ea3n ch\u1ea5t, AJAX kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 \u0111\u1ed9c l\u1eadp, m\u00e0 l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p kh\u00e9o l\u00e9o c\u1ee7a nhi\u1ec1u c\u00f4ng ngh\u1ec7 web \u0111\u00e3 c\u00f3. K\u1ef9 thu\u1eadt n\u00e0y \u0111\u01b0\u1ee3c coi l\u00e0 n\u1ec1n t\u1ea3ng cho s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng web \u0111\u1ed9ng (Dynamic Web Applications) hi\u1ec7n \u0111\u1ea1i m\u00e0 ch\u00fang ta s\u1eed d\u1ee5ng h\u00e0ng ng\u00e0y.<\/p>\n<figure id=\"attachment_28601\" aria-describedby=\"caption-attachment-28601\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/AJAX-la-gi.jpg\" alt=\"AJAX l\u00e0 g\u00ec?\" width=\"800\" height=\"500\" class=\"size-full wp-image-28601\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/AJAX-la-gi.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/AJAX-la-gi-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/AJAX-la-gi-768x480.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/AJAX-la-gi-750x469.jpg 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-28601\" class=\"wp-caption-text\">AJAX l\u00e0 g\u00ec?<\/figcaption><\/figure>\n<p>&#8220;Asynchronous&#8221; (B\u1ea5t \u0111\u1ed3ng b\u1ed9) l\u00e0 \u0111\u1eb7c t\u00ednh c\u1ed1t l\u00f5i, cho ph\u00e9p nhi\u1ec1u t\u00e1c v\u1ee5 ch\u1ea1y song song. &#8220;JavaScript&#8221; l\u00e0 ng\u00f4n ng\u1eef \u0111i\u1ec1u khi\u1ec3n qu\u00e1 tr\u00ecnh n\u00e0y, v\u00e0 &#8220;XML&#8221; l\u00e0 \u0111\u1ecbnh d\u1ea1ng d\u1eef li\u1ec7u ban \u0111\u1ea7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Tuy nhi\u00ean, hi\u1ec7n nay d\u1eef li\u1ec7u th\u01b0\u1eddng d\u00f9ng ph\u1ed5 bi\u1ebfn l\u00e0 JSON.<\/p>\n<p>Tr\u01b0\u1edbc khi c\u00f3 AJAX trong l\u1eadp tr\u00ecnh web, m\u1ecdi t\u01b0\u01a1ng t\u00e1c tr\u00ean web (nh\u01b0 g\u1eedi form hay click link) \u0111\u1ec1u <strong>y\u00eau c\u1ea7u tr\u00ecnh duy\u1ec7t t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9 trang m\u1edbi t\u1eeb server.<\/strong> \u0110i\u1ec1u n\u00e0y khi\u1ebfn qu\u00e1 tr\u00ecnh duy\u1ec7t web ch\u1eadm ch\u1ea1p, t\u1ed1n t\u00e0i nguy\u00ean v\u00e0 g\u00e2y kh\u00f3 ch\u1ecbu cho ng\u01b0\u1eddi d\u00f9ng b\u1edfi s\u1ef1 gi\u00e1n \u0111o\u1ea1n li\u00ean t\u1ee5c.<\/p>\n<p>K\u1ef9 thu\u1eadt AJAX gi\u1ea3i quy\u1ebft tri\u1ec7t \u0111\u1ec3 v\u1ea5n \u0111\u1ec1 n\u00e0y. N\u00f3 cho ph\u00e9p ch\u1ec9 c\u1eadp nh\u1eadt nh\u1eefng ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a trang web khi c\u00f3 d\u1eef li\u1ec7u m\u1edbi t\u1eeb server. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t tr\u1ea3i nghi\u1ec7m li\u1ec1n m\u1ea1ch, nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n \u0111\u00e1ng k\u1ec3, g\u1ea7n g\u0169i v\u1edbi \u1ee9ng d\u1ee5ng desktop.<\/p>\n<p><strong>V\u00ed d\u1ee5 v\u1ec1 \u1ee9ng d\u1ee5ng c\u1ee7a AJAX trong t\u00ecm ki\u1ebfm t\u1ef1 \u0111\u1ed9ng:<\/strong><\/p>\n<p>M\u1ed9t minh h\u1ecda \u0111i\u1ec3n h\u00ecnh cho c\u1eadp nh\u1eadt b\u1ea5t \u0111\u1ed3ng b\u1ed9 l\u00e0 t\u00ednh n\u0103ng Google Suggest. Khi b\u1ea1n g\u00f5 n\u1ed9i dung v\u00e0o \u00f4 t\u00ecm ki\u1ebfm, Google l\u1eadp t\u1ee9c tr\u1ea3 v\u1ec1 g\u1ee3i \u00fd c\u00e1c t\u1eeb kh\u00f3a li\u00ean quan d\u1ef1a tr\u00ean xu h\u01b0\u1edbng t\u00ecm ki\u1ebfm c\u1ee7a ng\u01b0\u1eddi d\u00f9ng kh\u00e1c, \u0111\u00f3 ch\u00ednh l\u00e0 Asynchronous JavaScript and XML \u0111ang ho\u1ea1t \u0111\u1ed9ng ph\u00eda sau.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cach-hoat-dong-cua-AJAX\"><\/span>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a AJAX<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>AJAX ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o? AJAX kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef hay c\u00f4ng ngh\u1ec7 duy nh\u1ea5t m\u00e0 l\u00e0 t\u1eadp h\u1ee3p c\u00e1c k\u1ef9 thu\u1eadt ph\u00e1t tri\u1ec3n web. N\u00f3 k\u1ebft h\u1ee3p HTML\/XHTML v\u1edbi CSS cho giao di\u1ec7n, DOM \u0111\u1ec3 hi\u1ec3n th\u1ecb v\u00e0 thao t\u00e1c \u0111\u1ed9ng, XML (ho\u1eb7c JSON) \u0111\u1ec3 trao \u0111\u1ed5i d\u1eef li\u1ec7u, c\u00f9ng \u0111\u1ed1i t\u01b0\u1ee3ng <strong>XMLHttpRequest<\/strong> cho giao ti\u1ebfp b\u1ea5t \u0111\u1ed3ng b\u1ed9, v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 JavaScript \u0111\u1ec3 \u0111i\u1ec1u ph\u1ed1i to\u00e0n b\u1ed9.<\/p>\n<ul>\n<li><strong>HTML\/XHTML + CSS<\/strong>:\u00a0D\u00f9ng\u00a0x\u00e2y\u00a0d\u1ef1ng\u00a0c\u1ea5u\u00a0tr\u00fac\u00a0v\u00e0\u00a0t\u1ea1o\u00a0phong\u00a0c\u00e1ch\u00a0cho\u00a0trang.<\/li>\n<li><strong>DOM<\/strong>:\u00a0Cho\u00a0ph\u00e9p\u00a0c\u1eadp\u00a0nh\u1eadt\u00a0n\u1ed9i\u00a0dung\u00a0\u0111\u1ed9ng\u00a0v\u00e0\u00a0t\u01b0\u01a1ng\u00a0t\u00e1c\u00a0ng\u01b0\u1eddi\u00a0d\u00f9ng.<\/li>\n<li><strong>XML\/JSON<\/strong>:\u00a0\u0110\u1ecbnh\u00a0d\u1ea1ng\u00a0d\u1eef\u00a0li\u1ec7u\u00a0trao\u00a0\u0111\u1ed5i\u00a0gi\u1eefa\u00a0client\u00a0v\u00e0\u00a0server.<\/li>\n<li><strong>XMLHttpRequest<\/strong>:\u00a0\u0110\u1ed1i\u00a0t\u01b0\u1ee3ng\u00a0th\u1ef1c\u00a0hi\u1ec7n\u00a0y\u00eau\u00a0c\u1ea7u\u00a0\u0111\u1ebfn\u00a0server\u00a0m\u00e0\u00a0kh\u00f4ng\u00a0t\u1ea3i\u00a0l\u1ea1i\u00a0trang.<\/li>\n<li><strong>JavaScript<\/strong>:\u00a0Ng\u00f4n\u00a0ng\u1eef\u00a0k\u1ebft\u00a0n\u1ed1i\u00a0t\u1ea5t\u00a0c\u1ea3\u00a0th\u00e0nh\u00a0ph\u1ea7n,\u00a0x\u1eed\u00a0l\u00fd\u00a0ph\u1ea3n\u00a0h\u1ed3i\u00a0v\u00e0\u00a0c\u1eadp\u00a0nh\u1eadt\u00a0giao\u00a0di\u1ec7n.<\/li>\n<\/ul>\n<p>Quy\u00a0tr\u00ecnh\u00a0AJAX\u00a0g\u1ed3m:\u00a0t\u1ea1o\u00a0m\u1ed9t\u00a0y\u00eau\u00a0c\u1ea7u\u00a0<strong>XMLHttpRequest<\/strong> t\u1eeb JavaScript \u2192 g\u1eedi \u0111\u1ebfn server \u2192 server tr\u1ea3 v\u1ec1 d\u1eef li\u1ec7u theo \u0111\u1ecbnh d\u1ea1ng XML\/JSON \u2192 JavaScript x\u1eed l\u00fd ph\u1ea3n h\u1ed3i \u2192 c\u1eadp nh\u1eadt DOM \u0111\u1ec3 hi\u1ec3n th\u1ecb d\u1eef li\u1ec7u m\u1edbi. Nh\u1edd v\u1eady, trang web c\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u1ed9i dung m\u00e0 kh\u00f4ng c\u1ea7n t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Loi-ich-va-han-che-cua-AJAX\"><\/span>L\u1ee3i \u00edch v\u00e0 h\u1ea1n ch\u1ebf c\u1ee7a AJAX<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Asynchronous JavaScript and XML mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch v\u01b0\u1ee3t tr\u1ed9i trong vi\u1ec7c <strong>c\u1ea3i thi\u1ec7n tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng v\u00e0 hi\u1ec7u su\u1ea5t \u1ee9ng d\u1ee5ng web<\/strong>, nh\u01b0ng c\u0169ng \u0111i k\u00e8m v\u1edbi m\u1ed9t s\u1ed1 h\u1ea1n ch\u1ebf c\u1ea7n \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd c\u1ea9n th\u1eadn. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u1ea3 hai m\u1eb7t l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh ph\u00f9 h\u1ee3p khi ph\u00e1t tri\u1ec3n web.<\/p>\n<p>K\u1ef9 thu\u1eadt n\u00e0y \u0111\u00e3 thay \u0111\u1ed5i c\u00e1ch ch\u00fang ta t\u01b0\u01a1ng t\u00e1c v\u1edbi web, bi\u1ebfn c\u00e1c trang t\u1eeb t\u0129nh sang \u0111\u1ed9ng v\u00e0 ph\u1ea3n h\u1ed3i nhanh. Tuy nhi\u00ean, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea7n l\u01b0u \u00fd \u0111\u1ebfn c\u00e1c v\u1ea5n \u0111\u1ec1 ti\u1ec1m \u1ea9n v\u1ec1 SEO, b\u1ea3o m\u1eadt v\u00e0 kh\u1ea3 n\u0103ng truy c\u1eadp \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u1ee9ng d\u1ee5ng ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 cho m\u1ecdi ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Loi-ich-chinh-cua-AJAX-la-gi\"><\/span>L\u1ee3i \u00edch ch\u00ednh c\u1ee7a AJAX l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>M\u1ed9t trong nh\u1eefng l\u1ee3i \u00edch c\u1ee7a AJAX l\u00e0<strong> c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 t\u1ed1c \u0111\u1ed9 v\u00e0 hi\u1ec7u su\u1ea5t t\u1ea3i trang.<\/strong> B\u1eb1ng c\u00e1ch ch\u1ec9 t\u1ea3i v\u1ec1 nh\u1eefng ph\u1ea7n d\u1eef li\u1ec7u m\u1edbi c\u1ea7n thi\u1ebft thay v\u00ec to\u00e0n b\u1ed9 trang HTML, l\u01b0\u1ee3ng d\u1eef li\u1ec7u trao \u0111\u1ed5i gi\u1eefa tr\u00ecnh duy\u1ec7t v\u00e0 m\u00e1y ch\u1ee7 gi\u1ea3m \u0111i \u0111\u00e1ng k\u1ec3.<\/p>\n<p>\u0110i\u1ec1u n\u00e0y tr\u1ef1c ti\u1ebfp d\u1eabn \u0111\u1ebfn <strong>n\u00e2ng cao tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng (UX)<\/strong>. Ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng ph\u1ea3i ch\u1edd \u0111\u1ee3i trang t\u1ea3i l\u1ea1i ho\u00e0n to\u00e0n, c\u00e1c c\u1eadp nh\u1eadt n\u1ed9i dung di\u1ec5n ra m\u01b0\u1ee3t m\u00e0 v\u00e0 g\u1ea7n nh\u01b0 t\u1ee9c th\u1eddi. C\u1ea3m gi\u00e1c t\u01b0\u01a1ng t\u00e1c nhanh v\u00e0 kh\u00f4ng b\u1ecb gi\u00e1n \u0111o\u1ea1n l\u00e0m t\u0103ng s\u1ef1 h\u00e0i l\u00f2ng khi s\u1eed d\u1ee5ng \u1ee9ng d\u1ee5ng web.<\/p>\n<p>AJAX c\u00f2n <strong>t\u0103ng kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c th\u1eddi gian th\u1ef1c<\/strong> v\u00e0 <strong>gi\u1ea3m t\u1ea3i cho m\u00e1y ch\u1ee7<\/strong>. \u1ee8ng d\u1ee5ng c\u00f3 th\u1ec3 li\u00ean t\u1ee5c g\u1eedi\/nh\u1eadn d\u1eef li\u1ec7u nh\u1ecf l\u1ebb \u0111\u1ec3 c\u1eadp nh\u1eadt th\u00f4ng tin (v\u00ed d\u1ee5: th\u00f4ng b\u00e1o m\u1edbi, d\u1eef li\u1ec7u bi\u1ec3u \u0111\u1ed3), v\u00e0 server ch\u1ec9 c\u1ea7n x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u d\u1eef li\u1ec7u nh\u1ecf thay v\u00ec render to\u00e0n b\u1ed9 trang HTML cho m\u1ed7i y\u00eau c\u1ea7u, gi\u00fap t\u1ed1i \u01b0u t\u00e0i nguy\u00ean.<\/p>\n<figure id=\"attachment_28602\" aria-describedby=\"caption-attachment-28602\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Loi-ich-va-han-che-cua-AJAX.jpg\" alt=\"L\u1ee3i \u00edch v\u00e0 h\u1ea1n ch\u1ebf c\u1ee7a AJAX\" width=\"800\" height=\"500\" class=\"size-full wp-image-28602\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Loi-ich-va-han-che-cua-AJAX.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Loi-ich-va-han-che-cua-AJAX-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Loi-ich-va-han-che-cua-AJAX-768x480.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Loi-ich-va-han-che-cua-AJAX-750x469.jpg 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-28602\" class=\"wp-caption-text\">L\u1ee3i \u00edch v\u00e0 h\u1ea1n ch\u1ebf c\u1ee7a AJAX<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Han-che-can-luu-y-cua-AJAX-la-gi\"><\/span>H\u1ea1n ch\u1ebf c\u1ea7n l\u01b0u \u00fd c\u1ee7a AJAX l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>M\u1eb7c d\u00f9 m\u1ea1nh m\u1ebd, AJAX c\u0169ng c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf nh\u1ea5t \u0111\u1ecbnh. M\u1ed9t trong nh\u1eefng v\u1ea5n \u0111\u1ec1 ban \u0111\u1ea7u l\u00e0 <strong>\u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn SEO c\u1ee7a trang web<\/strong>. C\u00e1c bot t\u00ecm ki\u1ebfm truy\u1ec1n th\u1ed1ng g\u1eb7p kh\u00f3 kh\u0103n khi index n\u1ed9i dung \u0111\u01b0\u1ee3c t\u1ea3i \u0111\u1ed9ng b\u1eb1ng JavaScript. D\u00f9 Google \u0111\u00e3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3, vi\u1ec7c tri\u1ec3n khai AJAX v\u1eabn c\u1ea7n c\u1ea9n tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o n\u1ed9i dung hi\u1ec3n th\u1ecb cho bot.<\/p>\n<p>AJAX c\u0169ng c\u00f3 th\u1ec3 g\u00e2y ra <strong>h\u1ea1n ch\u1ebf v\u1ec1 kh\u1ea3 n\u0103ng truy c\u1eadp<\/strong> (accessibility) v\u00e0 <strong>kh\u00f4ng l\u01b0u l\u1ea1i l\u1ecbch s\u1eed duy\u1ec7t web \u0111\u1ea7y \u0111\u1ee7<\/strong>. Ng\u01b0\u1eddi d\u00f9ng s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 \u0111\u1ecdc m\u00e0n h\u00ecnh c\u00f3 th\u1ec3 b\u1ecf l\u1ee1 n\u1ed9i dung t\u1ea3i \u0111\u1ed9ng n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c tri\u1ec3n khai \u0111\u00fang c\u00e1ch. T\u01b0\u01a1ng t\u1ef1, n\u00fat &#8220;Back&#8221; c\u1ee7a tr\u00ecnh duy\u1ec7t c\u00f3 th\u1ec3 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 mong \u0111\u1ee3i v\u00ec URL th\u01b0\u1eddng kh\u00f4ng thay \u0111\u1ed5i sau c\u00e1c thao t\u00e1c AJAX.<\/p>\n<p><strong>V\u1ea5n \u0111\u1ec1<\/strong> <strong>b\u1ea3o m\u1eadt<\/strong> c\u0169ng l\u00e0 m\u1ed9t m\u1ed1i quan t\u00e2m. N\u1ebfu d\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c t\u1eeb server qua AJAX kh\u00f4ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd v\u00e0 ki\u1ec3m tra c\u1ea9n th\u1eadn, \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng nh\u01b0 Cross-Site Scripting (XSS). C\u1ea7n tu\u00e2n th\u1ee7 c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt nghi\u00eam ng\u1eb7t khi l\u00e0m vi\u1ec7c v\u1edbi d\u1eef li\u1ec7u t\u1eeb server.<\/p>\n<p>Cu\u1ed1i c\u00f9ng, AJAX <strong>ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o JavaScript<\/strong>. N\u1ebfu ng\u01b0\u1eddi d\u00f9ng t\u1eaft JavaScript trong tr\u00ecnh duy\u1ec7t c\u1ee7a h\u1ecd, c\u00e1c t\u00ednh n\u0103ng d\u1ef1a tr\u00ean AJAX s\u1ebd kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng. \u0110\u00e2y l\u00e0 m\u1ed9t \u0111i\u1ec3m y\u1ebfu c\u1ea7n c\u00e2n nh\u1eafc, \u0111\u1eb7c bi\u1ec7t cho c\u00e1c n\u1ed9i dung c\u1ed1t l\u00f5i c\u1ee7a website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac-cong-nghe-su-dung-trong-AJAX\"><\/span>C\u00e1c c\u00f4ng ngh\u1ec7 s\u1eed d\u1ee5ng trong AJAX<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>K\u1ef9 thu\u1eadt AJAX t\u00edch h\u1ee3p nhi\u1ec1u c\u00f4ng ngh\u1ec7 web v\u00e0 l\u1eadp tr\u00ecnh kh\u00e1c nhau. S\u1ef1 k\u1ebft h\u1ee3p n\u00e0y cho ph\u00e9p c\u00e1c \u1ee9ng d\u1ee5ng web th\u1ef1c hi\u1ec7n trao \u0111\u1ed5i d\u1eef li\u1ec7u v\u1edbi m\u00e1y ch\u1ee7 web m\u00e0 kh\u00f4ng \u0111\u1ed3ng b\u1ed9, mang l\u1ea1i tr\u1ea3i nghi\u1ec7m m\u01b0\u1ee3t m\u00e0.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"HTML-XHTML-va-CSS-Xay-dung-cau-truc-va-phong-cach\"><\/span>HTML, XHTML v\u00e0 CSS: X\u00e2y d\u1ef1ng c\u1ea5u tr\u00fac v\u00e0 phong c\u00e1ch<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>HTML (Ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u si\u00eau v\u0103n b\u1ea3n), XHTML (Ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u si\u00eau v\u0103n b\u1ea3n m\u1edf r\u1ed9ng) v\u00e0 CSS (Cascading Style Sheets) l\u00e0 c\u00e1c ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u c\u01a1 b\u1ea3n. Ch\u1ee9c n\u0103ng c\u1ee7a ch\u00fang l\u00e0 th\u00f4ng b\u00e1o cho c\u00e1c tr\u00ecnh duy\u1ec7t web v\u1ec1 c\u00e1ch hi\u1ec3n th\u1ecb c\u1ea5u tr\u00fac v\u00e0 phong c\u00e1ch n\u1ed9i dung c\u1ee7a trang web.<\/p>\n<p>V\u00ed d\u1ee5 c\u1ee5 th\u1ec3, b\u1ea1n s\u1eed d\u1ee5ng HTML ho\u1eb7c XHTML \u0111\u1ec3 s\u1eafp x\u1ebfp v\u1ecb tr\u00ed v\u0103n b\u1ea3n v\u00e0 h\u00ecnh \u1ea3nh tr\u00ean trang. Sau \u0111\u00f3, CSS \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111\u1ec3 t\u00f9y ch\u1ec9nh giao di\u1ec7n, ch\u1eb3ng h\u1ea1n nh\u01b0 thay \u0111\u1ed5i ki\u1ec3u ch\u1eef ho\u1eb7c m\u00e0u n\u1ec1n, t\u1ea1o n\u00ean b\u1ed9 m\u1eb7t c\u1ee7a trang web.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"XML\"><\/span>XML<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>XML l\u00e0 ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u d\u1eef li\u1ec7u (markup language) cho ph\u00e9p trao \u0111\u1ed5i d\u1eef li\u1ec7u \u1edf \u0111\u1ecbnh d\u1ea1ng v\u0103n b\u1ea3n,\u00a0c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c bi\u1ec7t <strong>chia s\u1ebb d\u1eef li\u1ec7u v\u1edbi nhau<\/strong>. Do m\u1ed7i \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 bi\u1ec3u di\u1ec5n d\u1eef li\u1ec7u theo c\u00e1ch ri\u00eang, XML cung c\u1ea5p m\u1ed9t \u0111\u1ecbnh d\u1ea1ng chung d\u01b0\u1edbi d\u1ea1ng v\u0103n b\u1ea3n thu\u1ea7n t\u00fay \u0111\u1ec3 t\u1ea1o khung d\u1eef li\u1ec7u.<\/p>\n<p>C\u00e1c \u1ee9ng d\u1ee5ng AJAX c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng trao \u0111\u1ed5i v\u00e0 x\u1eed l\u00fd d\u1eef li\u1ec7u theo khu\u00f4n d\u1ea1ng XML ph\u1ed5 bi\u1ebfn n\u00e0y. Nhi\u1ec1u l\u1eadp tr\u00ecnh vi\u00ean hi\u1ec7n nay \u0111\u00e3 chuy\u1ec3n sang s\u1eed d\u1ee5ng JSON thay v\u00ec XML, b\u1edfi \u0111\u1ecbnh d\u1ea1ng n\u00e0y c\u00f3 c\u1ea5u tr\u00fac g\u1ea7n g\u0169i v\u00e0 d\u1ec5 l\u00e0m vi\u1ec7c h\u01a1n v\u1edbi JavaScript.<\/p>\n<figure id=\"attachment_28603\" aria-describedby=\"caption-attachment-28603\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Cac-cong-nghe-su-dung-trong-AJAX.jpg\" alt=\"C\u00e1c c\u00f4ng ngh\u1ec7 s\u1eed d\u1ee5ng trong AJAX\" width=\"800\" height=\"500\" class=\"size-full wp-image-28603\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Cac-cong-nghe-su-dung-trong-AJAX.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Cac-cong-nghe-su-dung-trong-AJAX-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Cac-cong-nghe-su-dung-trong-AJAX-768x480.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Cac-cong-nghe-su-dung-trong-AJAX-750x469.jpg 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-28603\" class=\"wp-caption-text\">C\u00e1c c\u00f4ng ngh\u1ec7 s\u1eed d\u1ee5ng trong AJAX<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"XMLHttpRequest\"><\/span>XMLHttpRequest<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>XMLHttpRequest l\u00e0 m\u1ed9t Giao di\u1ec7n L\u1eadp tr\u00ecnh \u1ee8ng d\u1ee5ng (API) cho ph\u00e9p tr\u00ecnh duy\u1ec7t web <strong>giao ti\u1ebfp v\u1edbi m\u00e1y ch\u1ee7 web \u1edf ch\u1ebf \u0111\u1ed9 kh\u00f4ng \u0111\u1ed3ng b\u1ed9<\/strong>. C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n s\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng XMLHttpRequest n\u00e0y \u0111\u1ec3 g\u1eedi \u0111i c\u00e1c ph\u1ea7n th\u00f4ng tin c\u1ee5 th\u1ec3 c\u1ee7a trang web \u0111\u1ebfn m\u00e1y ch\u1ee7, ban \u0111\u1ea7u th\u01b0\u1eddng \u1edf \u0111\u1ecbnh d\u1ea1ng XML.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"DOM-Document-Object-Model\"><\/span>DOM (Document Object Model)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>M\u00f4 h\u00ecnh \u0110\u1ed1i t\u01b0\u1ee3ng T\u00e0i li\u1ec7u (DOM) \u0111\u00f3ng vai tr\u00f2 t\u1ed5 ch\u1ee9c c\u00e1c trang HTML v\u00e0 XML theo c\u1ea5u tr\u00fac d\u1ea1ng c\u00e2y ph\u00e2n c\u1ea5p. C\u1ea5u tr\u00fac n\u00e0y bao g\u1ed3m c\u00e1c n\u00fat g\u1ed1c ph\u00e2n nh\u00e1nh th\u00e0nh nhi\u1ec1u n\u00fat con ho\u1eb7c c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng nh\u1ecf h\u01a1n. DOM cung c\u1ea5p kh\u1ea3 n\u0103ng t\u1ea1o ki\u1ec3u v\u00e0 s\u1eeda \u0111\u1ed5i m\u00e3 ngu\u1ed3n tr\u00ean c\u00e1c trang web c\u1ee5 th\u1ec3 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1ec3 c\u1eadp nh\u1eadt giao di\u1ec7n \u0111\u1ed9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"JavaScript\"><\/span>JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>JavaScript l\u00e0 ng\u00f4n ng\u1eef k\u1ecbch b\u1ea3n \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 <strong>th\u00eam n\u1ed9i dung \u0111\u1ed9ng v\u00e0o c\u00e1c trang web<\/strong>. N\u1ed9i dung \u0111\u1ed9ng l\u00e0 nh\u1eefng th\u00f4ng tin tr\u00ean trang web c\u00f3 kh\u1ea3 n\u0103ng c\u1eadp nh\u1eadt theo th\u1eddi gian th\u1ef1c ho\u1eb7c thay \u0111\u1ed5i d\u1ef1a tr\u00ean t\u01b0\u01a1ng t\u00e1c t\u1eeb ph\u00eda ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<p>Trong b\u1ed1i c\u1ea3nh c\u1ee7a AJAX, JavaScript ph\u1ed1i h\u1ee3p v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 web kh\u00e1c \u0111\u00e3 n\u00eau \u0111\u1ec3 k\u00edch ho\u1ea1t qu\u00e1 tr\u00ecnh c\u1eadp nh\u1eadt trang kh\u00f4ng \u0111\u1ed3ng b\u1ed9, li\u00ean k\u1ebft to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng n\u00e0y l\u1ea1i v\u1edbi nhau.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Truong-hop-ung-dung-ky-thuat-AJAX\"><\/span>Tr\u01b0\u1eddng h\u1ee3p \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt AJAX<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>AJAX l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt l\u1eadp tr\u00ecnh web cho ph\u00e9p vi\u1ec7c g\u1eedi v\u00e0 nh\u1eadn d\u1eef li\u1ec7u t\u1eeb m\u00e1y ch\u1ee7 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n m\u00e0 kh\u00f4ng c\u1ea7n t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9 trang web. Kh\u1ea3 n\u0103ng n\u00e0y mang l\u1ea1i nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf, c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Google-Maps\"><\/span>Google Maps<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>N\u1ec1n t\u1ea3ng b\u1ea3n \u0111\u1ed3 tr\u1ef1c tuy\u1ebfn Google Maps l\u00e0 m\u1ed9t v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh. Google Maps s\u1eed d\u1ee5ng k\u1ef9 thu\u1eadt AJAX \u0111\u1ec3 cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c t\u01b0\u01a1ng t\u00e1c v\u1edbi b\u1ea3n \u0111\u1ed3, nh\u01b0 k\u00e9o, ph\u00f3ng to hay thu nh\u1ecf, m\u00e0 to\u00e0n b\u1ed9 trang web kh\u00f4ng c\u1ea7n ph\u1ea3i t\u1ea3i l\u1ea1i.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Facebook-Chat\"><\/span>Facebook Chat<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi b\u1ea1n \u0111ang s\u1eed d\u1ee5ng t\u00ednh n\u0103ng tr\u00f2 chuy\u1ec7n tr\u00ean Facebook \u0111\u1ec3 li\u00ean l\u1ea1c v\u1edbi b\u1ea1n b\u00e8, c\u00e1c tin nh\u1eafn m\u1edbi \u0111\u1ebfn s\u1ebd \u0111\u01b0\u1ee3c t\u1ea3i v\u1ec1 v\u00e0 hi\u1ec3n th\u1ecb ngay l\u1eadp t\u1ee9c. Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u1edd AJAX, lo\u1ea1i b\u1ecf s\u1ef1 c\u1ea7n thi\u1ebft ph\u1ea3i l\u00e0m m\u1edbi l\u1ea1i to\u00e0n b\u1ed9 trang web \u0111\u1ec3 xem tin nh\u1eafn m\u1edbi.<\/p>\n<figure id=\"attachment_28604\" aria-describedby=\"caption-attachment-28604\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Truong-hop-ung-dung-ky-thuat-AJAX.jpg\" alt=\"Tr\u01b0\u1eddng h\u1ee3p \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt AJAX\" width=\"800\" height=\"500\" class=\"size-full wp-image-28604\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Truong-hop-ung-dung-ky-thuat-AJAX.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Truong-hop-ung-dung-ky-thuat-AJAX-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Truong-hop-ung-dung-ky-thuat-AJAX-768x480.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Truong-hop-ung-dung-ky-thuat-AJAX-750x469.jpg 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-28604\" class=\"wp-caption-text\">Tr\u01b0\u1eddng h\u1ee3p \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt AJAX<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Amazon\"><\/span>Amazon<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Tr\u00ean trang web th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed Amazon, khi kh\u00e1ch h\u00e0ng th\u00eam m\u1ed9t m\u1eb7t h\u00e0ng v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a m\u00ecnh, th\u00f4ng tin chi ti\u1ebft v\u1ec1 gi\u1ecf h\u00e0ng s\u1ebd \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt t\u1ee9c th\u00ec. Vi\u1ec7c c\u1eadp nh\u1eadt n\u00e0y s\u1eed d\u1ee5ng AJAX, gi\u00fap hi\u1ec3n th\u1ecb n\u1ed9i dung gi\u1ecf h\u00e0ng m\u1edbi m\u00e0 kh\u00f4ng y\u00eau c\u1ea7u trang ph\u1ea3i t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Twitter\"><\/span>Twitter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng m\u1ed9t tweet tr\u00ean n\u1ec1n t\u1ea3ng Twitter, c\u00e1c tweet m\u1edbi nh\u1ea5t \u0111\u01b0\u1ee3c \u0111\u0103ng b\u1edfi nh\u1eefng ng\u01b0\u1eddi b\u1ea1n theo d\u00f5i s\u1ebd t\u1ef1 \u0111\u1ed9ng xu\u1ea5t hi\u1ec7n. K\u1ef9 thu\u1eadt AJAX \u0111\u1ea3m b\u1ea3o r\u1eb1ng nh\u1eefng tweet m\u1edbi nh\u1ea5t n\u00e0y \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u1ef1c ti\u1ebfp tr\u00ean giao di\u1ec7n m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9 trang Twitter.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Gmail\"><\/span>Gmail<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u1ee8ng d\u1ee5ng web Gmail l\u00e0 m\u1ed9t v\u00ed d\u1ee5 ph\u1ed5 bi\u1ebfn kh\u00e1c minh h\u1ecda vi\u1ec7c s\u1eed d\u1ee5ng AJAX hi\u1ec7u qu\u1ea3. Gmail \u00e1p d\u1ee5ng AJAX \u0111\u1ec3 cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 nh\u01b0 g\u1eedi ho\u1eb7c nh\u1eadn email m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i tr\u1ea3i qua qu\u00e1 tr\u00ecnh t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9 trang web, mang l\u1ea1i tr\u1ea3i nghi\u1ec7m s\u1eed d\u1ee5ng \u1ee9ng d\u1ee5ng m\u01b0\u1ee3t m\u00e0 h\u01a1n.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tim-kiem-theo-thoi-gian-thuc-Autocomplete\"><\/span>T\u00ecm ki\u1ebfm theo th\u1eddi gian th\u1ef1c (Autocomplete)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi b\u1ea1n b\u1eaft \u0111\u1ea7u g\u00f5 v\u00e0o \u00f4 t\u00ecm ki\u1ebfm tr\u00ean c\u00e1c c\u00f4ng c\u1ee5 nh\u01b0 Google Search, AJAX ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch g\u1eedi t\u1eebng k\u00fd t\u1ef1 b\u1ea1n nh\u1eadp \u0111\u1ebfn m\u00e1y ch\u1ee7. Ngay l\u1eadp t\u1ee9c, m\u00e1y ch\u1ee7 ph\u1ea3n h\u1ed3i l\u1ea1i v\u1edbi c\u00e1c g\u1ee3i \u00fd t\u00ecm ki\u1ebfm c\u00f3 li\u00ean quan. T\u00ednh n\u0103ng ti\u1ec7n l\u1ee3i n\u00e0y, c\u00f2n g\u1ecdi l\u00e0 autocomplete, d\u1ef1 \u0111o\u00e1n \u00fd \u0111\u1ecbnh t\u00ecm ki\u1ebfm c\u1ee7a b\u1ea1n v\u00e0 nhanh ch\u00f3ng cung c\u1ea5p m\u1ed9t danh s\u00e1ch c\u00e1c t\u00f9y ch\u1ecdn g\u1ee3i \u00fd.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cau-hoi-thuong-gap-ve-AJAX\"><\/span>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 AJAX<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"AJAX-khac-gi-HTTP-thong-thuong\"><\/span>AJAX kh\u00e1c g\u00ec HTTP th\u00f4ng th\u01b0\u1eddng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>AJAX kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t giao th\u1ee9c thay th\u1ebf HTTP, m\u00e0 l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt s\u1eed d\u1ee5ng giao th\u1ee9c HTTP. Kh\u00e1c bi\u1ec7t l\u00e0 AJAX d\u00f9ng HTTP \u0111\u1ec3 trao \u0111\u1ed5i d\u1eef li\u1ec7u kh\u00f4ng \u0111\u1ed3ng b\u1ed9 v\u00e0 ch\u1ec9 m\u1ed9t ph\u1ea7n n\u1ed9i dung, thay v\u00ec t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9 trang nh\u01b0 c\u00e1c y\u00eau c\u1ea7u HTTP truy\u1ec1n th\u1ed1ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"AJAX-co-thay-the-duoc-tai-trang-truyen-thong-khong\"><\/span>AJAX c\u00f3 thay th\u1ebf \u0111\u01b0\u1ee3c t\u1ea3i trang truy\u1ec1n th\u1ed1ng kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>AJAX kh\u00f4ng thay th\u1ebf ho\u00e0n to\u00e0n t\u1ea3i trang truy\u1ec1n th\u1ed1ng. N\u00f3 l\u00e0 k\u1ef9 thu\u1eadt b\u1ed5 sung, gi\u00fap c\u1eadp nh\u1eadt n\u1ed9i dung sau khi trang \u0111\u00e3 t\u1ea3i l\u1ea7n \u0111\u1ea7u. Trang web ban \u0111\u1ea7u v\u1eabn c\u1ea7n t\u1ea3i b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p truy\u1ec1n th\u1ed1ng (s\u1eed d\u1ee5ng HTTP request cho HTML\/CSS\/JS), sau \u0111\u00f3 AJAX x\u1eed l\u00fd c\u00e1c t\u01b0\u01a1ng t\u00e1c \u0111\u1ed9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"AJAX-dung-giao-thuc-gi\"><\/span>AJAX d\u00f9ng giao th\u1ee9c g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>AJAX s\u1eed d\u1ee5ng c\u00e1c giao th\u1ee9c truy\u1ec1n t\u1ea3i d\u1eef li\u1ec7u ti\u00eau chu\u1ea9n c\u1ee7a web, ch\u1ee7 y\u1ebfu l\u00e0 HTTP (Hypertext Transfer Protocol) ho\u1eb7c phi\u00ean b\u1ea3n b\u1ea3o m\u1eadt HTTPS. M\u1ecdi ho\u1ea1t \u0111\u1ed9ng g\u1eedi\/nh\u1eadn d\u1eef li\u1ec7u trong AJAX \u0111\u1ec1u di\u1ec5n ra tr\u00ean n\u1ec1n t\u1ea3ng c\u1ee7a c\u00e1c giao th\u1ee9c n\u00e0y.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"AJAX-co-lien-quan-den-JavaScript-khong\"><\/span>AJAX c\u00f3 li\u00ean quan \u0111\u1ebfn JavaScript kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00f3, AJAX li\u00ean quan m\u1eadt thi\u1ebft v\u00e0 ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o JavaScript. JavaScript l\u00e0 ng\u00f4n ng\u1eef k\u1ecbch b\u1ea3n c\u1ed1t l\u00f5i \u0111i\u1ec1u khi\u1ec3n to\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh AJAX, t\u1eeb vi\u1ec7c kh\u1edfi t\u1ea1o y\u00eau c\u1ea7u, x\u1eed l\u00fd ph\u1ea3n h\u1ed3i t\u1eeb server, \u0111\u1ebfn vi\u1ec7c c\u1eadp nh\u1eadt n\u1ed9i dung tr\u00ean giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"AJAX-co-bao-mat-khong\"><\/span>AJAX c\u00f3 b\u1ea3o m\u1eadt kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>AJAX t\u1ef1 th\u00e2n kh\u00f4ng \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt tuy\u1ec7t \u0111\u1ed1i. T\u00ednh b\u1ea3o m\u1eadt ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o c\u00e1ch tri\u1ec3n khai. N\u1ebfu kh\u00f4ng x\u1eed l\u00fd d\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c t\u1eeb server m\u1ed9t c\u00e1ch an to\u00e0n v\u00e0 kh\u00f4ng c\u00f3 bi\u1ec7n ph\u00e1p x\u00e1c th\u1ef1c, \u1ee9ng d\u1ee5ng d\u00f9ng AJAX c\u00f3 th\u1ec3 ti\u1ec1m \u1ea9n c\u00e1c l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt.<\/p>\n<p>Asynchronous JavaScript and XML kh\u00f4ng ch\u1ec9 t\u1ea1o ra tr\u1ea3i nghi\u1ec7m web \u0111\u1ed9ng, nhanh nh\u1ea1y m\u00e0 c\u00f2n m\u1edf r\u1ed9ng kh\u1ea3 n\u0103ng ph\u00e1t tri\u1ec3n c\u00e1c t\u00ednh n\u0103ng th\u1eddi gian th\u1ef1c nh\u01b0 live search hay chat. D\u00f9 v\u1eabn c\u1ea7n c\u00e2n nh\u1eafc SEO, b\u1ea3o m\u1eadt v\u00e0 truy c\u1eadp, AJAX l\u00e0 k\u1ef9 thu\u1eadt kh\u00f4ng th\u1ec3 thi\u1ebfu trong kho c\u00f4ng c\u1ee5 c\u1ee7a l\u1eadp tr\u00ecnh vi\u00ean.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ea1n c\u00f3 bao gi\u1edd th\u1eafc m\u1eafc t\u1ea1i sao c\u00e1c trang web hi\u1ec7n \u0111\u1ea1i l\u1ea1i m\u01b0\u1ee3t m\u00e0 v\u00e0 ph\u1ea3n h\u1ed3i nhanh \u0111\u1ebfn v\u1eady, c\u1eadp nh\u1eadt n\u1ed9i dung m\u00e0 kh\u00f4ng c\u1ea7n t\u1ea3i l\u1ea1i trang? B\u00ed m\u1eadt \u0111\u1eb1ng sau tr\u1ea3i nghi\u1ec7m tuy\u1ec7t v\u1eddi \u1ea5y ch\u00ednh l\u00e0 k\u1ef9 thu\u1eadt AJAX. AJAX kh\u00f4ng ch\u1ec9 gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 t\u1ea3i trang<\/p>\n","protected":false},"author":11,"featured_media":28600,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[140],"tags":[],"class_list":["post-28588","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lap-trinh"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/28588","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=28588"}],"version-history":[{"count":4,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/28588\/revisions"}],"predecessor-version":[{"id":28669,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/28588\/revisions\/28669"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/28600"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=28588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=28588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=28588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}