Filtering Elements

Filtering elements in jQuery involves selecting a subset of elements from a larger set based on specific criteria. This allows developers to target and manipulate elements more precisely, enhancing the functionality and interactivity of web applications. jQuery provides a range of methods for filtering elements, each offering different capabilities and use cases.

Filtering Methods

filter()

The filter() method reduces the set of matched elements to those that match the specified selector or function.

				
					<!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> <style>.highlight { background-color: yellow; }</style></head>
<body>
    <ul>
        <li>Item 1</li>
        <li class="selected">Item 2</li>
        <li>Item 3</li>
    </ul> <script type="litespeed/javascript">$(document).ready(function(){$("li").filter(".selected").addClass("highlight")})</script> <script data-no-optimize="1">!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 i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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</html>

Explanation:

  • The filter() method selects the li element with the class selected and adds the highlight class to it.

Output:

  • Item 2 will have a yellow background.

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> <style>.highlight { font-weight: bold; }</style></head>
<body>
    <ul>
        <li>Item 1</li>
        <li class="excluded">Item 2</li>
        <li>Item 3</li>
    </ul> <script type="litespeed/javascript">$(document).ready(function(){$("li").not(".excluded").addClass("highlight")})</script> <script data-no-optimize="1">!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 i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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t.prototype={update:function(t){var e,n,a,i=this._settings,o=X(t,i);{if(h(this,o.length),!tt&&et)return H(i)?(e=i,n=this,o.forEach(function(t){-1!==kt.indexOf(t.tagName)&&F(t,e,n)}),void h(n,0)):(t=this._observer,i=o,t.disconnect(),a=t,void i.forEach(function(t){a.observe(t)}));this.loadAll(o)}},destroy:function(){this._observer&&this._observer.disconnect(),Q(this._settings).forEach(function(t){y(t)}),delete this._observer,delete this._settings,delete this.loadingCount,delete this.toLoadCount},loadAll:function(t){var e=this,n=this._settings;X(t,n).forEach(function(t){b(t,e),V(t,n,e)})},restoreAll:function(){var e=this._settings;Q(e).forEach(function(t){U(t,e)})}},t.load=function(t,e){e=i(e);V(t,e)},t.resetStatus=function(t){r(t)},Z&&function(t,e){if(e)if(e.length)for(var n,a=0;n=e[a];a+=1)o(t,n);else o(t,e)}(t,window.lazyLoadOptions),t});!function(e,t){"use strict";function a(){t.body.classList.add("litespeed_lazyloaded")}function n(){console.log("[LiteSpeed] Start Lazy Load 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d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script></body>
</html>

Explanation:

  • The not() method removes the li element with the class excluded from the set of matched elements and adds the highlight class to the remaining li elements.

Output:

  • Items 1 and 3 will be bold.

eq()

The eq() method reduces the set of matched elements to the one at the specified index.

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>eq() Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.highlight { color: red; }</style></head>
<body>
    <ul>
        <li>Item 1</li>
        <li>Item 2</li>
        <li>Item 3</li>
    </ul> <script type="litespeed/javascript">$(document).ready(function(){$("li").eq(1).addClass("highlight")})</script> <script data-no-optimize="1">!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 i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script></body>
</html>

Explanation:

  • The eq(1) method selects the second li element (index 1) and adds the highlight class to it.

Output:

  • Item 2 will have red text.

Advanced Filtering Techniques

Using Selectors in Filtering

jQuery selectors can be used within filtering methods to refine the selection further.

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Using Selectors in Filtering</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.highlight { background-color: lightblue; }</style></head>
<body>
    <ul>
        <li>Item 1</li>
        <li class="selected">Item 2</li>
        <li>Item 3</li>
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Explanation:

  • The :even selector within the filter() method selects even-indexed li elements and adds the highlight class to them.

Output:

  • Items 1 and 3 will have a light blue background.

Chaining Filters

Filters can be chained together for more complex selection criteria.

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
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<body>
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</html>

Explanation:

  • The not(":first") filter removes the first li element, then the filter(".selected") method selects the li element with the class selected, and finally, the highlight class is added to it.

Output:

  • Item 2 will be italicized.

Practical Examples

Example 1: Filtering Elements by Class

Highlighting elements based on their class attribute.

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Filtering by Class Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.highlight { background-color: yellow; }</style></head>
<body>
    <ul>
        <li>Item 1</li>
        <li class="selected">Item 2</li>
        <li>Item 3</li>
    </ul> <script type="litespeed/javascript">$(document).ready(function(){$("li.selected").addClass("highlight")})</script> <script data-no-optimize="1">!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 i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script></body>
</html>

Explanation:

  • This script selects all li elements with the class selected and adds the highlight class to them.

Output:

  • Item 2 will have a yellow background.

Example 2: Filtering Elements by Attribute

Styling elements based on the presence of a specific attribute.

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Filtering by Attribute Example</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.highlight { color: blue; }</style></head>
<body>
    <ul>
        <li>Item 1</li>
        <li data-category="important">Item 2</li>
        <li>Item 3</li>
    </ul> <script type="litespeed/javascript">$(document).ready(function(){$("li[data-category='important']").addClass("highlight")})</script> <script data-no-optimize="1">!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 i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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Explanation:

  • This script selects the li element with the attribute data-category set to important and adds the highlight class to it.

Output:

  • Item 2 will have blue text.

Example 3: Combining Filters

Applying multiple filters to select specific elements.

				
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<html lang="en">
<head>
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</html>

Explanation:

  • This script selects the li element with the class selected, excludes the first one using not(":first"), and then adds the highlight class to it.

Output:

  • Item 2 will be bold.

Filtering elements with jQuery is a powerful technique that allows developers to select specific elements from a set based on various criteria. By using methods like filter(), not(), and eq(), along with selectors and chaining filters, developers can achieve precise element selection and manipulation. Happy coding !❤️

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