{"id":30114,"date":"2025-06-12T10:12:45","date_gmt":"2025-06-12T03:12:45","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=30114"},"modified":"2025-06-12T10:17:44","modified_gmt":"2025-06-12T03:17:44","slug":"ham-find-trong-jquery","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/","title":{"rendered":"H\u00e0m .Find() trong jQuery: C\u00e1ch d\u00f9ng, V\u00ed D\u1ee5 &#038; L\u1ed7i Th\u01b0\u1eddng G\u1eb7p"},"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\/ham-find-trong-jquery\/#Ham-find-trong-jQuery-la-gi\" >H\u00e0m .find() trong jQuery 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\/ham-find-trong-jquery\/#Cu-phap-va-cach-dung-ham-find\" >C\u00fa ph\u00e1p v\u00e0 c\u00e1ch d\u00f9ng h\u00e0m .find()<\/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\/ham-find-trong-jquery\/#Vi-du-co-ban-ve-find\" >V\u00ed d\u1ee5 c\u01a1 b\u1ea3n v\u1ec1 .find()<\/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\/ham-find-trong-jquery\/#Tim-theo-class\" >T\u00ecm theo class<\/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\/ham-find-trong-jquery\/#Tim-theo-ID\" >T\u00ecm theo ID<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#Tim-theo-thuoc-tinh-Attribute\" >T\u00ecm theo thu\u1ed9c t\u00ednh (Attribute)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#Tim-nhieu-phan-tu-Multiple-Elements\" >T\u00ecm nhi\u1ec1u ph\u1ea7n t\u1eed (Multiple Elements)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#So-sanh-find-voi-children-va-filter\" >So s\u00e1nh find() v\u1edbi children() v\u00e0 filter()<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#find-vs-children\" >.find() vs .children()<\/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\/ham-find-trong-jquery\/#find-vs-filter\" >.find() vs .filter()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#Loi-thuong-gap-khi-dung-find\" >L\u1ed7i th\u01b0\u1eddng g\u1eb7p khi d\u00f9ng find()<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#find-khong-tra-ve-ket-qua\" >.find() kh\u00f4ng tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#Dung-find-tren-phan-tu-duoc-them-dong-Dynamic-Elements\" >D\u00f9ng .find() tr\u00ean ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c th\u00eam \u0111\u1ed9ng (Dynamic Elements)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#Mot-so-cau-hoi-lien-quan\" >M\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi li\u00ean quan<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/ham-find-trong-jquery\/#Lam-the-nao-de-tim-phan-tu-theo-noi-dung-text\" >L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00ecm ph\u1ea7n t\u1eed theo n\u1ed9i dung text?<\/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\/ham-find-trong-jquery\/#Co-the-noi-chuoi-chaining-find-khong\" >C\u00f3 th\u1ec3 n\u1ed1i chu\u1ed7i (chaining) .find() kh\u00f4ng?<\/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\/ham-find-trong-jquery\/#find-nhanh-hay-cham\" >find() nhanh hay ch\u1eadm?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>Vi\u1ec7c thao t\u00e1c ch\u00ednh x\u00e1c v\u1edbi Document Object Model (DOM) quy\u1ebft \u0111\u1ecbnh hi\u1ec7u qu\u1ea3 c\u1ee7a m\u1ed9t <a href=\"https:\/\/interdata.vn\/blog\/web-dong-la-gi\/\">trang web \u0111\u1ed9ng<\/a>. H\u00e0m <code>.find()<\/code> trong jQuery l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 duy\u1ec7t DOM m\u1ea1nh m\u1ebd, gi\u00fap b\u1ea1n truy v\u1ea5n c\u00e1c ph\u1ea7n t\u1eed m\u1ed9t c\u00e1ch nhanh ch\u00f3ng. B\u00e0i vi\u1ebft n\u00e0y c\u1ee7a InterData s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n to\u00e0n di\u1ec7n v\u1ec1 <code>.find()<\/code>, t\u1eeb c\u00fa ph\u00e1p, c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf, so s\u00e1nh v\u1edbi c\u00e1c h\u00e0m li\u00ean quan v\u00e0 c\u00e1ch x\u1eed l\u00fd nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ham-find-trong-jQuery-la-gi\"><\/span>H\u00e0m .find() trong jQuery l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>H\u00e0m <code>.find()<\/code> trong jQuery l\u00e0 m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c duy\u1ec7t c\u00e2y DOM. Ph\u01b0\u01a1ng th\u1ee9c n\u00e0y b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c ph\u1ea7n t\u1eed \u0111\u00e3 ch\u1ecdn v\u00e0 t\u00ecm ki\u1ebfm t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed <strong>con ch\u00e1u<\/strong> (descendants) c\u1ee7a ch\u00fang. &#8220;Con ch\u00e1u&#8221; bao g\u1ed3m con tr\u1ef1c ti\u1ebfp, ch\u00e1u, ch\u1eaft v\u00e0 m\u1ecdi c\u1ea5p \u0111\u1ed9 s\u00e2u h\u01a1n b\u00ean trong ph\u1ea7n t\u1eed g\u1ed1c.<\/p>\n<p>K\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 c\u1ee7a <code>.find()<\/code> l\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng jQuery m\u1edbi, ch\u1ee9a t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed con ch\u00e1u kh\u1edbp v\u1edbi \u0111i\u1ec1u ki\u1ec7n l\u1ecdc b\u1ea1n \u0111\u01b0a ra. \u0110i\u1ec1u n\u00e0y gi\u00fap b\u1ea1n thu h\u1eb9p ph\u1ea1m vi t\u00ecm ki\u1ebfm v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c h\u00e0nh \u0111\u1ed9ng ti\u1ebfp theo m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c tr\u00ean c\u00e1c ph\u1ea7n t\u1eed mong mu\u1ed1n.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery.jpg\" alt=\"H\u00e0m .find() trong jQuery\" width=\"600\" height=\"400\" class=\"aligncenter wp-image-30115\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cu-phap-va-cach-dung-ham-find\"><\/span>C\u00fa ph\u00e1p v\u00e0 c\u00e1ch d\u00f9ng h\u00e0m .find()<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00fa ph\u00e1p c\u1ee7a h\u00e0m <code>.find()<\/code> r\u1ea5t \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 nh\u1edb, gi\u00fap b\u1ea1n \u00e1p d\u1ee5ng nhanh ch\u00f3ng v\u00e0o d\u1ef1 \u00e1n c\u1ee7a m\u00ecnh. C\u1ea5u tr\u00fac c\u01a1 b\u1ea3n c\u1ee7a ph\u01b0\u01a1ng th\u1ee9c n\u00e0y nh\u01b0 sau:<\/p>\n<p><code>$(selector).find(filter)<\/code><\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li><code>$(selector)<\/code>: \u0110\u00e2y l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng jQuery ban \u0111\u1ea7u, ch\u1ee9a m\u1ed9t ho\u1eb7c nhi\u1ec1u ph\u1ea7n t\u1eed DOM m\u00e0 b\u1ea1n mu\u1ed1n b\u1eaft \u0111\u1ea7u t\u00ecm ki\u1ebfm t\u1eeb \u0111\u00f3.<\/li>\n<li><code>filter<\/code>: \u0110\u00e2y l\u00e0 m\u1ed9t chu\u1ed7i selector (gi\u1ed1ng nh\u01b0 selector trong CSS) d\u00f9ng \u0111\u1ec3 l\u1ecdc v\u00e0 t\u00ecm ki\u1ebfm c\u00e1c ph\u1ea7n t\u1eed con ch\u00e1u. B\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng selector theo class (<code>.myClass<\/code>), ID (<code>#myID<\/code>), thu\u1ed9c t\u00ednh (<code>[type='text']<\/code>), ho\u1eb7c c\u00e1c th\u1ebb <a href=\"https:\/\/interdata.vn\/blog\/html-la-gi\/\">HTML<\/a> (<code>p<\/code>, <code>span<\/code>).<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Vi-du-co-ban-ve-find\"><\/span>V\u00ed d\u1ee5 c\u01a1 b\u1ea3n v\u1ec1 .find()<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>L\u00fd thuy\u1ebft s\u1ebd d\u1ec5 hi\u1ec3u h\u01a1n r\u1ea5t nhi\u1ec1u khi \u0111i k\u00e8m v\u1edbi c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 k\u1ecbch b\u1ea3n ph\u1ed5 bi\u1ebfn m\u00e0 c\u00e1c <a href=\"https:\/\/interdata.vn\/blog\/lap-trinh-la-gi\/\">l\u1eadp tr\u00ecnh<\/a> vi\u00ean th\u01b0\u1eddng xuy\u00ean s\u1eed d\u1ee5ng h\u00e0m <code>.find()<\/code> \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00f4ng vi\u1ec7c h\u00e0ng ng\u00e0y.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-01.jpg\" alt=\"H\u00e0m .find() trong jQuery\" width=\"600\" height=\"400\" class=\"aligncenter wp-image-30116\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-01.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-01-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tim-theo-class\"><\/span>T\u00ecm theo class<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn nh\u1ea5t. B\u1ea1n c\u00f3 m\u1ed9t kh\u1ed1i <code>div<\/code> v\u00e0 c\u1ea7n t\u00ecm t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed c\u00f3 m\u1ed9t class c\u1ee5 th\u1ec3 b\u00ean trong. Vi\u1ec7c n\u00e0y gi\u00fap b\u1ea1n \u00e1p d\u1ee5ng style ho\u1eb7c g\u1eafn s\u1ef1 ki\u1ec7n cho m\u1ed9t nh\u00f3m ph\u1ea7n t\u1eed.<\/p>\n<p><strong>C\u1ea5u tr\u00fac HTML:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">&lt;div id=\"product-list\"&gt;\r\n  &lt;div class=\"product-item\"&gt;\r\n    &lt;p class=\"product-name\"&gt;S\u1ea3n ph\u1ea9m A&lt;\/p&gt;\r\n  &lt;\/div&gt;\r\n  &lt;div class=\"product-item inactive\"&gt;\r\n    &lt;p class=\"product-name\"&gt;S\u1ea3n ph\u1ea9m B&lt;\/p&gt;\r\n  &lt;\/div&gt;\r\n  &lt;p&gt;M\u00f4 t\u1ea3 ngo\u00e0i l\u1ec1.&lt;\/p&gt;\r\n&lt;\/div&gt;\r\n\r\n<\/code><\/pre>\n<p><strong>Code jQuery:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">\/\/ Ch\u1ecdn div#product-list, sau \u0111\u00f3 t\u00ecm t\u1ea5t c\u1ea3 c\u00e1c p.product-name b\u00ean trong\r\n$('#product-list').find('p.product-name').css('color', 'blue');\r\n\r\n<\/code><\/pre>\n<p>Trong v\u00ed d\u1ee5 n\u00e0y, ch\u1ec9 c\u00e1c th\u1ebb <code>&lt;p&gt;<\/code> c\u00f3 class <code>product-name<\/code> b\u00ean trong <code>div#product-list<\/code> m\u1edbi \u0111\u01b0\u1ee3c \u0111\u1ed5i m\u00e0u th\u00e0nh xanh. Th\u1ebb <code>&lt;p&gt;<\/code> &#8220;M\u00f4 t\u1ea3 ngo\u00e0i l\u1ec1&#8221; s\u1ebd kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng v\u00ec kh\u00f4ng kh\u1edbp selector.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tim-theo-ID\"><\/span>T\u00ecm theo ID<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>M\u1eb7c d\u00f9 ID trong HTML l\u00e0 duy nh\u1ea5t, \u0111\u00f4i khi b\u1ea1n c\u1ea7n x\u00e1c \u0111\u1ecbnh m\u1ed9t ph\u1ea7n t\u1eed c\u00f3 ID c\u1ee5 th\u1ec3 n\u1eb1m trong m\u1ed9t khu v\u1ef1c nh\u1ea5t \u0111\u1ecbnh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh \u0111\u00fang \u0111\u1eafn c\u1ee7a logic, \u0111\u1eb7c bi\u1ec7t khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c template ph\u1ee9c t\u1ea1p.<\/p>\n<p><strong>C\u1ea5u tr\u00fac HTML:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">&lt;div class=\"content-section\"&gt;\r\n  &lt;p&gt;M\u1ed9t v\u00e0i n\u1ed9i dung...&lt;\/p&gt;\r\n  &lt;button id=\"submit-btn\"&gt;G\u1eedi&lt;\/button&gt;\r\n&lt;\/div&gt;\r\n&lt;div class=\"sidebar-section\"&gt;\r\n  &lt;button id=\"cancel-btn\"&gt;H\u1ee7y&lt;\/button&gt;\r\n&lt;\/div&gt;\r\n\r\n<\/code><\/pre>\n<p><strong>Code jQuery:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">\/\/ Ch\u1ec9 t\u00ecm button c\u00f3 ID l\u00e0 submit-btn b\u00ean trong .content-section\r\n$('.content-section').find('#submit-btn').addClass('active');\r\n\r\n<\/code><\/pre>\n<p>H\u00e0m <code>.find()<\/code> \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ec9 c\u00f3 n\u00fat <code>#submit-btn<\/code> trong khu v\u1ef1c <code>.content-section<\/code> \u0111\u01b0\u1ee3c th\u00eam class <code>active<\/code>. \u0110i\u1ec1u n\u00e0y gi\u00fap tr\u00e1nh xung \u0111\u1ed9t n\u1ebfu c\u00f3 c\u00e1c ph\u1ea7n t\u1eed kh\u00e1c v\u1edbi ID t\u01b0\u01a1ng t\u1ef1 \u1edf n\u01a1i kh\u00e1c.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tim-theo-thuoc-tinh-Attribute\"><\/span>T\u00ecm theo thu\u1ed9c t\u00ednh (Attribute)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Vi\u1ec7c t\u00ecm ki\u1ebfm ph\u1ea7n t\u1eed d\u1ef1a tr\u00ean thu\u1ed9c t\u00ednh c\u1ee7a ch\u00fang c\u1ef1c k\u1ef3 h\u1eefu \u00edch, \u0111\u1eb7c bi\u1ec7t khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c form. B\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng ch\u1ecdn c\u00e1c \u00f4 input d\u1ef1a tr\u00ean <code>type<\/code>, <code>name<\/code> ho\u1eb7c c\u00e1c thu\u1ed9c t\u00ednh <code>data-*<\/code>.<\/p>\n<p><strong>C\u1ea5u tr\u00fac HTML:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">&lt;form id=\"user-form\"&gt;\r\n  &lt;input type=\"text\" name=\"username\" placeholder=\"T\u00ean \u0111\u0103ng nh\u1eadp\"&gt;\r\n  &lt;input type=\"password\" name=\"password\" placeholder=\"M\u1eadt kh\u1ea9u\"&gt;\r\n  &lt;input type=\"checkbox\" name=\"remember\" checked&gt; Ghi nh\u1edb\r\n&lt;\/form&gt;\r\n\r\n<\/code><\/pre>\n<p><strong>Code jQuery:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">\/\/ T\u00ecm t\u1ea5t c\u1ea3 c\u00e1c input c\u00f3 thu\u1ed9c t\u00ednh type=\"password\"\r\n$('#user-form').find('input[type=\"password\"]').css('border-color', 'red');\r\n\r\n<\/code><\/pre>\n<p>V\u00ed d\u1ee5 tr\u00ean minh h\u1ecda c\u00e1ch b\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng \u0111\u1ecbnh v\u1ecb m\u1ed9t lo\u1ea1i input c\u1ee5 th\u1ec3 trong m\u1ed9t form \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c x\u00e1c th\u1ef1c (validation) ho\u1eb7c thay \u0111\u1ed5i <a href=\"https:\/\/interdata.vn\/blog\/ui-la-gi\/\">giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng<\/a>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tim-nhieu-phan-tu-Multiple-Elements\"><\/span>T\u00ecm nhi\u1ec1u ph\u1ea7n t\u1eed (Multiple Elements)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>H\u00e0m <code>.find()<\/code> cho ph\u00e9p b\u1ea1n truy\u1ec1n v\u00e0o m\u1ed9t selector ph\u1ee9c h\u1ee3p \u0111\u1ec3 t\u00ecm ki\u1ebfm nhi\u1ec1u lo\u1ea1i ph\u1ea7n t\u1eed kh\u00e1c nhau c\u00f9ng m\u1ed9t l\u00fac. B\u1ea1n ch\u1ec9 c\u1ea7n ph\u00e2n t\u00e1ch c\u00e1c selector b\u1eb1ng d\u1ea5u ph\u1ea9y, t\u01b0\u01a1ng t\u1ef1 nh\u01b0 trong CSS.<\/p>\n<p><strong>C\u1ea5u tr\u00fac HTML:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">&lt;article class=\"post\"&gt;\r\n  &lt;h2&gt;Ti\u00eau \u0111\u1ec1 b\u00e0i vi\u1ebft&lt;\/h2&gt;\r\n  &lt;p&gt;\u0110\u00e2y l\u00e0 \u0111o\u1ea1n v\u0103n b\u1ea3n \u0111\u1ea7u ti\u00ean.&lt;\/p&gt;\r\n  &lt;img src=\"image.jpg\" alt=\"\u1ea2nh minh h\u1ecda\"&gt;\r\n  &lt;span&gt;M\u1ed9t ch\u00fa th\u00edch nh\u1ecf.&lt;\/span&gt;\r\n&lt;\/article&gt;\r\n\r\n<\/code><\/pre>\n<p><strong>Code jQuery:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">\/\/ T\u00ecm t\u1ea5t c\u1ea3 c\u00e1c th\u1ebb p v\u00e0 span b\u00ean trong .post\r\n$('.post').find('p, span').addClass('highlight');\r\n\r\n<\/code><\/pre>\n<p>K\u1ef9 thu\u1eadt n\u00e0y gi\u00fap b\u1ea1n \u00e1p d\u1ee5ng m\u1ed9t h\u00e0nh \u0111\u1ed9ng chung cho nhi\u1ec1u lo\u1ea1i ph\u1ea7n t\u1eed con ch\u00e1u kh\u00e1c nhau m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, gi\u00fap <a href=\"https:\/\/interdata.vn\/blog\/source-code-la-gi\/\">m\u00e3 ngu\u1ed3n<\/a> c\u1ee7a b\u1ea1n ng\u1eafn g\u1ecdn v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec h\u01a1n.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"So-sanh-find-voi-children-va-filter\"><\/span>So s\u00e1nh find() v\u1edbi children() v\u00e0 filter()<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>M\u1ed9t trong nh\u1eefng th\u00e1ch th\u1ee9c l\u1edbn nh\u1ea5t \u0111\u1ed1i v\u1edbi l\u1eadp tr\u00ecnh vi\u00ean m\u1edbi l\u00e0 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c <code>.find()<\/code>, <code>.children()<\/code>, v\u00e0 <code>.filter()<\/code>. Vi\u1ec7c ch\u1ecdn sai ph\u01b0\u01a1ng th\u1ee9c c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 kh\u00f4ng mong mu\u1ed1n.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-02.jpg\" alt=\"H\u00e0m .find() trong jQuery\" width=\"600\" height=\"400\" class=\"aligncenter wp-image-30117\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-02.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-02-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"find-vs-children\"><\/span>.find() vs .children()<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>S\u1ef1 kh\u00e1c bi\u1ec7t c\u1ed1t l\u00f5i n\u1eb1m \u1edf \u0111\u1ed9 s\u00e2u t\u00ecm ki\u1ebfm.<\/p>\n<ul>\n<li><code>.find()<\/code>: Duy\u1ec7t qua t\u1ea5t c\u1ea3 c\u00e1c c\u1ea5p \u0111\u1ed9 con ch\u00e1u (descendants).<\/li>\n<li><code>.children()<\/code>: Ch\u1ec9 duy\u1ec7t \u1edf c\u1ea5p \u0111\u1ed9 con tr\u1ef1c ti\u1ebfp (direct children).<\/li>\n<\/ul>\n<p><strong>C\u00e2u tr\u1ea3 l\u1eddi c\u1ed1t l\u00f5i:<\/strong> D\u00f9ng <code>.children()<\/code> khi b\u1ea1n ch\u1ec9 mu\u1ed1n l\u1ea5y c\u00e1c ph\u1ea7n t\u1eed con ngay c\u1ea5p \u0111\u1ea7u ti\u00ean. D\u00f9ng <code>.find()<\/code> khi b\u1ea1n c\u1ea7n t\u00ecm ki\u1ebfm s\u00e2u h\u01a1n v\u00e0o b\u00ean trong c\u1ea5u tr\u00fac HTML.<\/p>\n<p><strong>V\u00ed d\u1ee5:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">&lt;ul class=\"level-1\"&gt;\r\n  &lt;li class=\"item-a\"&gt;M\u1ee5c A&lt;\/li&gt;\r\n  &lt;li class=\"item-b\"&gt;\r\n    M\u1ee5c B\r\n    &lt;ul class=\"level-2\"&gt;\r\n      &lt;li class=\"item-c\"&gt;M\u1ee5c C&lt;\/li&gt;\r\n    &lt;\/ul&gt;\r\n  &lt;\/li&gt;\r\n&lt;\/ul&gt;\r\n```javascript\r\n\/\/ .find() s\u1ebd t\u00ecm th\u1ea5y c\u1ea3 .item-a, .item-b, v\u00e0 .item-c\r\n$('.level-1').find('li').length; \/\/ K\u1ebft qu\u1ea3: 3\r\n\r\n\/\/ .children() ch\u1ec9 t\u00ecm th\u1ea5y .item-a v\u00e0 .item-b\r\n$('.level-1').children('li').length; \/\/ K\u1ebft qu\u1ea3: 2\r\n\r\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"find-vs-filter\"><\/span>.find() vs .filter()<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>S\u1ef1 kh\u00e1c bi\u1ec7t n\u1eb1m \u1edf \u0111\u1ed1i t\u01b0\u1ee3ng \u00e1p d\u1ee5ng.<\/p>\n<ul>\n<li><code>.find()<\/code>: T\u00ecm ki\u1ebfm <strong>b\u00ean trong<\/strong> t\u1eadp h\u1ee3p c\u00e1c ph\u1ea7n t\u1eed hi\u1ec7n t\u1ea1i.<\/li>\n<li><code>.filter()<\/code>: <strong>S\u00e0ng l\u1ecdc<\/strong> ngay tr\u00ean t\u1eadp h\u1ee3p c\u00e1c ph\u1ea7n t\u1eed hi\u1ec7n t\u1ea1i.<\/li>\n<\/ul>\n<p><strong>C\u00e2u tr\u1ea3 l\u1eddi c\u1ed1t l\u00f5i:<\/strong> D\u00f9ng <code>.find()<\/code> \u0111\u1ec3 &#8220;nh\u00ecn xu\u1ed1ng&#8221; c\u00e2y DOM. D\u00f9ng <code>.filter()<\/code> \u0111\u1ec3 &#8220;thu h\u1eb9p&#8221; t\u1eadp h\u1ee3p c\u00e1c ph\u1ea7n t\u1eed b\u1ea1n \u0111\u00e3 c\u00f3.<\/p>\n<p><strong>V\u00ed d\u1ee5:<\/strong><\/p>\n<pre><code class=\"language-plaintext\">&lt;div class=\"container\"&gt;\r\n  &lt;p class=\"text\"&gt;\u0110o\u1ea1n v\u0103n 1&lt;\/p&gt;\r\n  &lt;p class=\"text important\"&gt;\u0110o\u1ea1n v\u0103n 2&lt;\/p&gt;\r\n  &lt;div class=\"box\"&gt;\r\n    &lt;p class=\"text\"&gt;\u0110o\u1ea1n v\u0103n 3&lt;\/p&gt;\r\n  &lt;\/div&gt;\r\n&lt;\/div&gt;\r\n```javascript\r\n\/\/ T\u00ecm c\u00e1c th\u1ebb p.text B\u00caN TRONG div.container\r\n$('div.container').find('p.text').length; \/\/ K\u1ebft qu\u1ea3: 3\r\n\r\n\/\/ L\u1ecdc c\u00e1c th\u1ebb div c\u00f3 class .container v\u00e0 c\u0169ng c\u00f3 class .box (v\u00f4 l\u00fd, kh\u00f4ng c\u00f3)\r\n$('div.container').filter('.box').length; \/\/ K\u1ebft qu\u1ea3: 0\r\n\r\n<\/code><\/pre>\n<p>Trong v\u00ed d\u1ee5 tr\u00ean, <code>.find()<\/code> ho\u1ea1t \u0111\u1ed9ng nh\u01b0 mong \u0111\u1ee3i. Ng\u01b0\u1ee3c l\u1ea1i, <code>.filter('.box')<\/code> \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng tr\u00ean <code>div.container<\/code>, v\u00e0 v\u00ec <code>div.container<\/code> kh\u00f4ng c\u00f3 class <code>.box<\/code> n\u00ean k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 r\u1ed7ng.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Loi-thuong-gap-khi-dung-find\"><\/span>L\u1ed7i th\u01b0\u1eddng g\u1eb7p khi d\u00f9ng find()<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ngay c\u1ea3 c\u00e1c l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 kinh nghi\u1ec7m \u0111\u00f4i khi c\u0169ng g\u1eb7p ph\u1ea3i nh\u1eefng l\u1ed7i kh\u00f4ng mong mu\u1ed1n khi s\u1eed d\u1ee5ng <code>.find()<\/code>. Hi\u1ec3u r\u00f5 nguy\u00ean nh\u00e2n s\u1ebd gi\u00fap b\u1ea1n g\u1ee1 l\u1ed7i nhanh h\u01a1n r\u1ea5t nhi\u1ec1u.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-03.jpg\" alt=\"H\u00e0m .find() trong jQuery\" width=\"600\" height=\"400\" class=\"aligncenter wp-image-30118\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-03.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/06\/ham-find-trong-jquery-03-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"find-khong-tra-ve-ket-qua\"><\/span>.find() kh\u00f4ng tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t. B\u1ea1n ch\u1eafc ch\u1eafn r\u1eb1ng selector c\u1ee7a m\u00ecnh \u0111\u00fang nh\u01b0ng v\u1eabn nh\u1eadn v\u1ec1 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng r\u1ed7ng. C\u00f3 hai nguy\u00ean nh\u00e2n ch\u00ednh cho v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n<p>Th\u1ee9 nh\u1ea5t, selector c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 kh\u00f4ng ch\u00ednh x\u00e1c ho\u1eb7c ph\u1ea7n t\u1eed b\u1ea1n t\u00ecm kh\u00f4ng t\u1ed3n t\u1ea1i trong ph\u1ea1m vi t\u00ecm ki\u1ebfm. Lu\u00f4n ki\u1ec3m tra l\u1ea1i c\u00fa ph\u00e1p v\u00e0 c\u1ea5u tr\u00fac HTML. Th\u1ee9 hai, v\u00e0 ph\u1ed5 bi\u1ebfn h\u01a1n, l\u00e0 do m\u00e3 JavaScript c\u1ee7a b\u1ea1n th\u1ef1c thi tr\u01b0\u1edbc khi c\u00e2y DOM \u0111\u01b0\u1ee3c t\u1ea3i ho\u00e0n to\u00e0n.<\/p>\n<p><strong>Gi\u1ea3i ph\u00e1p:<\/strong> Lu\u00f4n \u0111\u1eb7t m\u00e3 jQuery c\u1ee7a b\u1ea1n b\u00ean trong h\u00e0m <code>$(document).ready()<\/code>. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed HTML \u0111\u00e3 s\u1eb5n s\u00e0ng tr\u01b0\u1edbc khi m\u00e3 c\u1ee7a b\u1ea1n b\u1eaft \u0111\u1ea7u ch\u1ea1y.<\/p>\n<pre><code class=\"language-plaintext\">$(document).ready(function() {\r\n  \/\/ \u0110\u1eb7t to\u00e0n b\u1ed9 code jQuery c\u1ee7a b\u1ea1n v\u00e0o \u0111\u00e2y\r\n  $('#product-list').find('p.product-name').css('color', 'blue');\r\n});<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Dung-find-tren-phan-tu-duoc-them-dong-Dynamic-Elements\"><\/span>D\u00f9ng .find() tr\u00ean ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c th\u00eam \u0111\u1ed9ng (Dynamic Elements)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi b\u1ea1n th\u00eam c\u00e1c ph\u1ea7n t\u1eed HTML v\u00e0o trang b\u1eb1ng JavaScript (v\u00ed d\u1ee5 sau m\u1ed9t cu\u1ed9c g\u1ecdi AJAX), c\u00e1c tr\u00ecnh x\u1eed l\u00fd s\u1ef1 ki\u1ec7n (event handlers) \u0111\u01b0\u1ee3c g\u1eafn tr\u01b0\u1edbc \u0111\u00f3 s\u1ebd kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng cho c\u00e1c ph\u1ea7n t\u1eed m\u1edbi n\u00e0y. T\u01b0\u01a1ng t\u1ef1, <code>.find()<\/code> s\u1ebd kh\u00f4ng t\u00ecm th\u1ea5y ch\u00fang n\u1ebfu b\u1ea1n t\u00ecm ki\u1ebfm qu\u00e1 s\u1edbm.<\/p>\n<p>V\u1ea5n \u0111\u1ec1 n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft b\u1eb1ng k\u1ef9 thu\u1eadt <strong>event delegation<\/strong>. Thay v\u00ec g\u1eafn s\u1ef1 ki\u1ec7n tr\u1ef1c ti\u1ebfp v\u00e0o ph\u1ea7n t\u1eed, b\u1ea1n g\u1eafn s\u1ef1 ki\u1ec7n v\u00e0o m\u1ed9t ph\u1ea7n t\u1eed cha \u0111\u00e3 t\u1ed3n t\u1ea1i v\u00e0 l\u1eafng nghe c\u00e1c s\u1ef1 ki\u1ec7n t\u1eeb c\u00e1c ph\u1ea7n t\u1eed con.<\/p>\n<pre><code class=\"language-plaintext\">\/\/ Thay v\u00ec: $('.item').click(...)\r\n\/\/ H\u00e3y d\u00f9ng:\r\n$('#parent-container').on('click', '.item', function() {\r\n  \/\/ 'this' \u1edf \u0111\u00e2y s\u1ebd l\u00e0 .item \u0111\u01b0\u1ee3c click, d\u00f9 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o l\u00fac n\u00e0o\r\n  $(this).find('span').toggleClass('active');\r\n});\r\n\r\n<\/code><\/pre>\n<p>K\u1ef9 thu\u1eadt n\u00e0y \u0111\u1ea3m b\u1ea3o m\u00e3 c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u qu\u1ea3 v\u1edbi n\u1ed9i dung \u0111\u1ed9ng.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Mot-so-cau-hoi-lien-quan\"><\/span>M\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi li\u00ean quan<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Lam-the-nao-de-tim-phan-tu-theo-noi-dung-text\"><\/span>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00ecm ph\u1ea7n t\u1eed theo n\u1ed9i dung text?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>B\u1ea1n c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p <code>.find()<\/code> v\u1edbi b\u1ed9 ch\u1ecdn <code>:contains()<\/code> c\u1ee7a jQuery. Selector <code>:contains(\"v\u0103n b\u1ea3n\")<\/code> s\u1ebd t\u00ecm c\u00e1c ph\u1ea7n t\u1eed ch\u1ee9a chu\u1ed7i v\u0103n b\u1ea3n \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh. \u0110\u00e2y l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p m\u1ea1nh m\u1ebd \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb ph\u1ea7n t\u1eed d\u1ef1a tr\u00ean n\u1ed9i dung hi\u1ec3n th\u1ecb cho ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Co-the-noi-chuoi-chaining-find-khong\"><\/span>C\u00f3 th\u1ec3 n\u1ed1i chu\u1ed7i (chaining) .find() kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00f3, b\u1ea1n ho\u00e0n to\u00e0n c\u00f3 th\u1ec3. Vi\u1ec7c n\u1ed1i chu\u1ed7i c\u00e1c ph\u01b0\u01a1ng th\u1ee9c l\u00e0 m\u1ed9t trong nh\u1eefng th\u1ebf m\u1ea1nh c\u1ee7a jQuery, gi\u00fap vi\u1ebft code ng\u1eafn g\u1ecdn. V\u00ed d\u1ee5, <code>$('body').find('div.main-content').find('ul.menu')<\/code> l\u00e0 ho\u00e0n to\u00e0n h\u1ee3p l\u1ec7 v\u00e0 hi\u1ec7u qu\u1ea3 \u0111\u1ec3 t\u00ecm ki\u1ebfm theo c\u1ea5p b\u1eadc.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"find-nhanh-hay-cham\"><\/span>find() nhanh hay ch\u1eadm?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>H\u00e0m <code>.find()<\/code> \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a v\u00e0 ho\u1ea1t \u0111\u1ed9ng r\u1ea5t nhanh trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p. Theo t\u00e0i li\u1ec7u c\u1ee7a jQuery, hi\u1ec7u su\u1ea5t c\u1ee7a <code>.find(selector)<\/code> g\u1ea7n nh\u01b0 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi <code>$(selector, context)<\/code>. \u0110\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t cao nh\u1ea5t, h\u00e3y c\u1ed1 g\u1eafng cung c\u1ea5p m\u1ed9t ng\u1eef c\u1ea3nh (context) t\u00ecm ki\u1ebfm c\u00e0ng c\u1ee5 th\u1ec3 c\u00e0ng t\u1ed1t.<\/p>\n<p>Vi\u1ec7c l\u00e0m ch\u1ee7 <code>.find()<\/code> v\u00e0 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c duy\u1ec7t DOM li\u00ean quan s\u1ebd gi\u00fap b\u1ea1n x\u00e2y d\u1ef1ng c\u00e1c <a href=\"https:\/\/interdata.vn\/blog\/web-application-la-gi\/\">\u1ee9ng d\u1ee5ng web<\/a> ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch t\u1ef1 tin. Qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n v\u00e0 ki\u1ec3m th\u1eed s\u1ebd tr\u1edf n\u00ean m\u01b0\u1ee3t m\u00e0 h\u01a1n khi b\u1ea1n c\u00f3 m\u1ed9t m\u00f4i tr\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh.<\/p>\n<p>Tham kh\u1ea3o d\u1ecbch v\u1ee5 <a href=\"https:\/\/interdata.vn\/thue-vps\/\">thu\u00ea m\u00e1y ch\u1ee7 \u1ea3o SSD (VPS SSD) gi\u00e1 r\u1ebb &#8211; Hi\u1ec7u n\u0103ng cao<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vi\u1ec7c thao t\u00e1c ch\u00ednh x\u00e1c v\u1edbi Document Object Model (DOM) quy\u1ebft \u0111\u1ecbnh hi\u1ec7u qu\u1ea3 c\u1ee7a m\u1ed9t trang web \u0111\u1ed9ng. H\u00e0m .find() trong jQuery l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 duy\u1ec7t DOM m\u1ea1nh m\u1ebd, gi\u00fap b\u1ea1n truy v\u1ea5n c\u00e1c ph\u1ea7n t\u1eed m\u1ed9t c\u00e1ch nhanh ch\u00f3ng. B\u00e0i vi\u1ebft n\u00e0y c\u1ee7a InterData s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n to\u00e0n di\u1ec7n v\u1ec1 .find(),<\/p>\n","protected":false},"author":2,"featured_media":30115,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[140],"tags":[],"class_list":["post-30114","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\/30114","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=30114"}],"version-history":[{"count":3,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/30114\/revisions"}],"predecessor-version":[{"id":30128,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/30114\/revisions\/30128"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/30115"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=30114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=30114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=30114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}