Traversing the DOM with jQuery
Traversing the DOM (Document Object Model) is a fundamental skill for any web developer, allowing you to navigate and manipulate the HTML elements of a webpage. jQuery makes DOM traversal straightforward with a rich set of methods that can be used to find and interact with elements based on their relationships.
DOM Traversal
DOM traversal involves moving through the DOM tree to access elements based on their relationships to other elements. jQuery provides methods to easily traverse up, down, and sideways in the DOM, allowing you to select elements based on their positions relative to other elements.
Why DOM Traversal?
Understanding and using DOM traversal is crucial for tasks such as:
- Manipulating elements dynamically.
- Handling events.
- Creating dynamic user interfaces.
- Improving user experience by selectively interacting with specific parts of the DOM.
Basic Traversal Methods
parent()
The parent() method returns the direct parent of each element in the set of matched elements.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>parent() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div id="parent">
<p id="child">This is a child paragraph.</p>
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</html>
Explanation:
- The
parent()method selects the parent of the#childelement and applies a red border to it.
Output:
- The
#parentdiv will have a red border.
children()
The children() method returns all direct children of each element in the set of matched elements.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>children() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div id="parent">
<p class="child">Child paragraph 1</p>
<p class="child">Child paragraph 2</p>
</div> <script type="litespeed/javascript">$(document).ready(function(){$("#parent").children().css("color","blue")})</script> <script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:300},window.lazyLoadOptions||{});!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function o(t){return e({},at,t)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,vt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,vt,e)}function i(t){return s(t,null),0}function r(t){return null===c(t)}function u(t){return c(t)===_t}function d(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function f(t,e){et?t.classList.add(e):t.className+=(t.className?" 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</html>
Explanation:
- The
children()method selects all direct children of the#parentdiv and changes their text color to blue.
Output:
- Both child paragraphs will have blue text.
siblings()
The siblings() method returns all sibling elements of each element in the set of matched elements.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>siblings() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div id="parent">
<p id="first">First paragraph</p>
<p class="sibling">Sibling paragraph 1</p>
<p class="sibling">Sibling paragraph 2</p>
</div> <script type="litespeed/javascript">$(document).ready(function(){$("#first").siblings().css("background-color","yellow")})</script> <script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:300},window.lazyLoadOptions||{});!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function o(t){return e({},at,t)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,vt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,vt,e)}function i(t){return s(t,null),0}function r(t){return null===c(t)}function u(t){return c(t)===_t}function d(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function f(t,e){et?t.classList.add(e):t.className+=(t.className?" 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</html>
Explanation:
- The
siblings()method selects all sibling elements of the#firstparagraph and changes their background color to yellow.
Output:
- The sibling paragraphs will have a yellow background.
next()
The next() method returns the immediately following sibling of each element in the set of matched elements.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>next() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div id="parent">
<p id="first">First paragraph</p>
<p class="sibling">Sibling paragraph 1</p>
<p class="sibling">Sibling paragraph 2</p>
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</html>
Explanation:
- The
next()method selects the next sibling of the#firstparagraph and makes its text bold.
Output:
- The paragraph following the
#firstparagraph will have bold text.
prev()
The prev() method returns the immediately preceding sibling of each element in the set of matched elements.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>prev() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div id="parent">
<p class="sibling">Sibling paragraph 1</p>
<p id="middle">Middle paragraph</p>
<p class="sibling">Sibling paragraph 2</p>
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</html>
Explanation:
- The
prev()method selects the previous sibling of the#middleparagraph and makes its text italic.
Output:
- The paragraph preceding the
#middleparagraph will have italic text.
Filtering Methods
filter()
The filter() method reduces the set of matched elements to those that match the selector or pass the function’s test.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>filter() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div id="parent">
<p class="child">Paragraph 1</p>
<p class="child special">Paragraph 2</p>
<p class="child">Paragraph 3</p>
</div> <script type="litespeed/javascript">$(document).ready(function(){$(".child").filter(".special").css("color","red")})</script> <script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:300},window.lazyLoadOptions||{});!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function o(t){return e({},at,t)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,vt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,vt,e)}function i(t){return s(t,null),0}function r(t){return null===c(t)}function u(t){return c(t)===_t}function d(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function f(t,e){et?t.classList.add(e):t.className+=(t.className?" 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</html>
Explanation:
- The
filter()method selects only the paragraphs with the classspecialwithin the set of elements with the classchildand changes their text color to red.
Output:
- Only the second paragraph will have red text.
not()
The not() method removes elements from the set of matched elements.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>not() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div id="parent">
<p class="child">Paragraph 1</p>
<p class="child special">Paragraph 2</p>
<p class="child">Paragraph 3</p>
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</html>
Explanation:
- The
not()method selects all paragraphs with the classchildexcept those with the classspecialand changes their text color to blue.
Output:
- The first and third paragraphs will have blue text.
has()
The has() method reduces the set of matched elements to those that have a descendant that matches the selector or contain a specific element.
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<html lang="en">
<head>
<meta charset="UTF-8">
<title>has() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="container">
<p>This is a paragraph.</p>
<div class="nested">
<p>This is a nested paragraph.</p>
</div>
</div>
<div class="container">
<p>This is another paragraph.</p>
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</html>
Explanation:
- The
has()method selects thedivelements with the classcontainerthat contain a descendant with the classnestedand applies a green border to them.
Output:
- Only the first
divwith the classcontainerwill have a green border.
Advanced Traversal Techniques
find()
The find() method gets the descendants of each element in the current set of matched elements, filtered by a selector.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>find() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="container">
<p>This is a paragraph.</p>
<div class="nested">
<p>This is a nested paragraph.</p>
</div>
</div> <script type="litespeed/javascript">$(document).ready(function(){$(".container").find(".nested").css("background-color","yellow")})</script> <script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:300},window.lazyLoadOptions||{});!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function o(t){return e({},at,t)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,vt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,vt,e)}function i(t){return s(t,null),0}function r(t){return null===c(t)}function u(t){return c(t)===_t}function d(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function f(t,e){et?t.classList.add(e):t.className+=(t.className?" 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document.createElement("p"),nt=Y&&1<window.devicePixelRatio,at={elements_selector:".lazy",container:Z||Y?document:null,threshold:300,thresholds:null,data_src:"src",data_srcset:"srcset",data_sizes:"sizes",data_bg:"bg",data_bg_hidpi:"bg-hidpi",data_bg_multi:"bg-multi",data_bg_multi_hidpi:"bg-multi-hidpi",data_poster:"poster",class_applied:"applied",class_loading:"litespeed-loading",class_loaded:"litespeed-loaded",class_error:"error",class_entered:"entered",class_exited:"exited",unobserve_completed:!0,unobserve_entered:!1,cancel_on_exit:!0,callback_enter:null,callback_exit:null,callback_applied:null,callback_loading:null,callback_loaded:null,callback_error:null,callback_finish:null,callback_cancel:null,use_native:!1},ot="src",it="srcset",rt="sizes",ct="poster",lt="llOriginalAttrs",st="loading",ut="loaded",dt="applied",ft="error",_t="native",gt="data-",vt="ll-status",bt=[st,ut,dt,ft],pt=[ot],ht=[ot,ct],mt=[ot,it,rt],Et={IMG:function(t,e){h(t,function(t){y(t,mt),O(t,e)}),y(t,mt),O(t,e)},IFRAME:function(t,e){y(t,pt),A(t,ot,l(t,e.data_src))},VIDEO:function(t,e){a(t,function(t){y(t,pt),A(t,ot,l(t,e.data_src))}),y(t,ht),A(t,ct,l(t,e.data_poster)),A(t,ot,l(t,e.data_src)),t.load()}},It=["IMG","IFRAME","VIDEO"],yt={IMG:j,IFRAME:function(t){L(t,pt)},VIDEO:function(t){a(t,function(t){L(t,pt)}),L(t,ht),t.load()}},Lt=["IMG","IFRAME","VIDEO"];return 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</html>
Explanation:
- The
find()method selects all elements with the classnestedthat are descendants of elements with the classcontainerand changes their background color to yellow.
Output:
- The nested paragraph will have a yellow background.
closest()
The closest() method gets the first element that matches the selector, beginning at the current element and progressing up through the DOM tree.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>closest() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="container">
<div class="inner">
<p class="target">This is a target paragraph.</p>
</div>
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</html>
Explanation:
- The
closest()method selects the closest ancestor with the classcontainerof the element with the classtargetand applies a blue border to it.
Output:
- The
divwith the classcontainerwill have a blue border.
parentsUntil()
The parentsUntil() method gets all ancestors up to but not including the element matched by the selector.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>parentsUntil() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="outer">
<div class="middle">
<div class="inner">
<p class="target">This is a target paragraph.</p>
</div>
</div>
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</html>
Explanation:
- The
parentsUntil()method selects all ancestors of thetargetparagraph up to but not including theouterdiv and changes their background color to light gray.
Output:
- The
middleandinnerdivs will have a light gray background.
nextUntil()
The nextUntil() method gets all following siblings up to but not including the element matched by the selector.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>nextUntil() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="container">
<p class="start">Start paragraph</p>
<p>Middle paragraph 1</p>
<p>Middle paragraph 2</p>
<p class="end">End paragraph</p>
</div> <script type="litespeed/javascript">$(document).ready(function(){$(".start").nextUntil(".end").css("color","green")})</script> <script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:300},window.lazyLoadOptions||{});!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function o(t){return e({},at,t)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,vt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,vt,e)}function i(t){return s(t,null),0}function r(t){return null===c(t)}function u(t){return c(t)===_t}function d(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function f(t,e){et?t.classList.add(e):t.className+=(t.className?" 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</html>
Explanation:
- The
nextUntil()method selects all following siblings of thestartparagraph up to but not including theendparagraph and changes their text color to green.
Output:
- The two middle paragraphs will have green text.
prevUntil()
The prevUntil() method gets all preceding siblings up to but not including the element matched by the selector.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>prevUntil() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="container">
<p class="start">Start paragraph</p>
<p>Middle paragraph 1</p>
<p>Middle paragraph 2</p>
<p class="end">End paragraph</p>
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</html>
Explanation:
- The
prevUntil()method selects all preceding siblings of theendparagraph up to but not including thestartparagraph and makes their text bold.
Output:
- The two middle paragraphs will have bold text.
Practical Examples
Example 1: Highlighting Parent Elements
Highlighting the direct parent of an element when it is clicked.
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<html lang="en">
<head>
<meta charset="UTF-8">
<title>Highlight Parent Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="parent">
<p class="child">Click me to highlight my parent.</p>
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</html>
Explanation:
- When a paragraph with the class
childis clicked, theparent()method is used to select its parent and change its background color to light blue.
Output:
- Clicking on the paragraph will highlight its parent
divwith a light blue background.
Example 2: Selecting and Modifying Siblings
Changing the text of all sibling elements of a clicked element.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Select and Modify Siblings Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="container">
<p class="target">Click me to change my siblings' text.</p>
<p class="sibling">Sibling paragraph 1</p>
<p class="sibling">Sibling paragraph 2</p>
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</html>
Explanation:
- When the paragraph with the class
targetis clicked, thesiblings()method selects all its siblings and changes their text.
Output:
- Clicking on the
targetparagraph will change the text of the sibling paragraphs to “Text changed!”.
Example 3: Navigating Complex Hierarchies
Finding and styling a specific element within a nested structure.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Complex Hierarchy Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<div class="outer">
<div class="middle">
<div class="inner">
<p class="target">This is a target paragraph.</p>
</div>
</div>
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Explanation:
- The
find()method is used to navigate through the nested structure and select thetargetparagraph, applying a purple border to it.
Output:
- The
targetparagraph will have a purple border.
Traversing the DOM with jQuery is a powerful way to interact with and manipulate elements on a webpage. From basic traversal methods like parent(), children(), siblings(), next(), and prev() to advanced techniques such as find(), closest(), parentsUntil(), nextUntil(), and prevUntil(), jQuery provides a rich set of tools to navigate the DOM efficiently. Happy coding !❤️