Applying CSS styles
Applying CSS styles dynamically is a fundamental aspect of creating interactive web applications. jQuery provides various methods to manipulate the CSS of elements, allowing developers to change the appearance and behavior of their web pages based on user interactions or other conditions. This chapter will cover everything from the basics to advanced techniques of applying CSS styles with jQuery, ensuring you have a comprehensive understanding.
Why Apply CSS Styles with jQuery?
Applying CSS styles with jQuery is essential for:
- Creating dynamic and interactive web pages.
- Modifying the appearance of elements based on user actions or other events.
- Implementing responsive designs that adapt to different screen sizes and orientations.
- Enhancing user experience by providing visual feedback.
Key Methods for Applying CSS Styles
jQuery offers several methods for manipulating CSS styles:
.css().width().height().offset().position()
Each of these methods serves a specific purpose and can be used in various scenarios to achieve different styling effects.
Basic CSS Style Manipulation
The .css() Method
The .css() method is the most versatile way to apply CSS styles to elements. It allows you to get or set one or more CSS properties for the selected elements.
$(selector).css(propertyName, value);
$(selector).css({ propertyName: value, propertyName2: value2, ... });
Example: Changing a Single CSS Property
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Change CSS Property</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<button id="changeColorButton">Change Color</button>
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</html>
Explanation:
- When the “Change Color” button is clicked, the color of the paragraph is changed to blue using the
.css()method.
Output:
- Initially, the paragraph has the default text color.
- After clicking the “Change Color” button, the paragraph’s text color changes to blue.
Example: Changing Multiple CSS Properties
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Change Multiple CSS Properties</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
<button id="changeStylesButton">Change Styles</button>
<p>This paragraph's styles will be changed.</p> <script type="litespeed/javascript">$(document).ready(function(){$("#changeStylesButton").click(function(){$("p").css({"color":"green","font-size":"20px","background-color":"yellow"})})})</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:
- When the “Change Styles” button is clicked, multiple CSS properties of the paragraph are changed using the
.css()method.
Output:
- Initially, the paragraph has the default styles.
- After clicking the “Change Styles” button, the paragraph’s text color changes to green, font size to 20px, and background color to yellow.
Manipulating Element Dimensions
The .width() Method
The .width() method gets or sets the width of the selected elements.
$(selector).width();
$(selector).width(value);
Example: Setting Element Width
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Set Width</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.box {
height: 100px;
background-color: lightgray;
}</style></head>
<body>
<button id="setWidthButton">Set Width</button>
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d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script></body>
</html>
Explanation:
- When the “Set Width” button is clicked, the width of the div with class
boxis set to 200 pixels using the.width()method.
Output:
- Initially, the box has its default width.
- After clicking the “Set Width” button, the box’s width changes to 200 pixels.
The .height() Method
The .height() method gets or sets the height of the selected elements.
$(selector).height();
$(selector).height(value);
Example: Setting Element Height
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Set Height</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.box {
width: 100px;
background-color: lightgray;
}</style></head>
<body>
<button id="setHeightButton">Set Height</button>
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</html>
Explanation:
- When the “Set Height” button is clicked, the height of the div with class
boxis set to 150 pixels using the.height()method.
Output:
- Initially, the box has its default height.
- After clicking the “Set Height” button, the box’s height changes to 150 pixels.
Positioning Elements
The .offset() Method
The .offset() method gets or sets the current coordinates of the selected elements relative to the document.
$(selector).offset();
$(selector).offset(coordinates);
Example: Setting Element Offset
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Set Offset</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.box {
width: 100px;
height: 100px;
background-color: lightgray;
position: absolute;
}</style></head>
<body>
<button id="setOffsetButton">Set Offset</button>
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d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script></body>
</html>
Explanation:
- When the “Set Offset” button is clicked, the position of the div with class
boxis set to 100 pixels from the top and 100 pixels from the left using the.offset()method.
Output:
- Initially, the box is positioned at its default location.
- After clicking the “Set Offset” button, the box moves to the specified position.
The .position() Method
The .position() method gets the current coordinates of the selected elements relative to the offset parent.
$(selector).position();
Example: Getting Element Position
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Get Position</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.box {
width: 100px;
height: 100px;
background-color: lightgray;
position: absolute;
top: 50px;
left: 50px;
}</style></head>
<body>
<button id="getPositionButton">Get Position</button>
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d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script></body>
</html>
Explanation:
- When the “Get Position” button is clicked, the position of the div with class
boxrelative to its offset parent is retrieved using the.position()method. - An alert displays the top and left coordinates of the box.
Output:
- Initially, the box is positioned at 50 pixels from the top and 50 pixels from the left.
- After clicking the “Get Position” button, an alert shows the coordinates of the box.
Advanced CSS Manipulation
Animating CSS Properties
jQuery allows you to animate CSS properties to create smooth transitions and effects.
Example: Animating Width and Height
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Animate CSS Properties</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.box {
width: 100px;
height: 100px;
background-color: lightgray;
position: absolute;
}</style></head>
<body>
<button id="animateButton">Animate</button>
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</html>
Explanation:
- When the “Animate” button is clicked, the width and height of the div with class
boxare animated to 200 pixels over a duration of 1000 milliseconds (1 second) using the.animate()method.
Output:
- Initially, the box is 100×100 pixels.
- After clicking the “Animate” button, the box smoothly transitions to 200×200 pixels over 1 second.
Using CSS Functions
jQuery also supports several CSS functions to manipulate properties.
Example: Toggling Visibility
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Toggle Visibility</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.box {
width: 100px;
height: 100px;
background-color: lightgray;
position: absolute;
}</style></head>
<body>
<button id="toggleButton">Toggle Visibility</button>
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document.createElement("p"),at=Z&&1<window.devicePixelRatio,it={elements_selector:".lazy",container:tt||Z?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",rt="srcset",ct="sizes",lt="poster",st="llOriginalAttrs",ut="loading",dt="loaded",ft="applied",_t="error",vt="native",gt="data-",bt="ll-status",pt=[ut,dt,ft,_t],ht=[ot],mt=[ot,lt],Et=[ot,rt,ct],It={IMG:function(t,e){m(t,function(t){A(t,Et),x(t,e)}),A(t,Et),x(t,e)},IFRAME:function(t,e){A(t,ht),w(t,ot,l(t,e.data_src))},VIDEO:function(t,e){a(t,function(t){A(t,ht),w(t,ot,l(t,e.data_src))}),A(t,mt),w(t,lt,l(t,e.data_poster)),w(t,ot,l(t,e.data_src)),t.load()}},yt=["IMG","IFRAME","VIDEO"],At={IMG:P,IFRAME:function(t){k(t,ht)},VIDEO:function(t){a(t,function(t){k(t,ht)}),k(t,mt),t.load()}},kt=["IMG","IFRAME","VIDEO"];return 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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,"$1"))}return d}</script></body>
</html>
Explanation:
- When the “Toggle Visibility” button is clicked, the visibility of the div with class
boxis toggled between visible and hidden using the.toggle()method.
Output:
- Initially, the box is visible.
- After clicking the “Toggle Visibility” button, the box alternates between being visible and hidden each time the button is clicked.
Example 1: Highlighting Form Fields on Focus
When a user focuses on an input field, it can be helpful to highlight it to improve user experience. We can achieve this by changing the background color of the input field when it gains focus and reverting the color when it loses focus.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Highlight Form Fields</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.input-field {
padding: 10px;
margin: 5px;
border: 1px solid #ccc;
}
.highlight {
background-color: #e0f7fa;
}</style></head>
<body>
<input type="text" class="input-field" placeholder="First Name">
<input type="text" class="input-field" placeholder="Last Name"> <script type="litespeed/javascript">$(document).ready(function(){$(".input-field").focus(function(){$(this).addClass("highlight")}).blur(function(){$(this).removeClass("highlight")})})</script> <script data-no-optimize="1">!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script></body>
</html>
Explanation:
- When an input field gains focus, the
highlightclass is added, changing its background color. - When the input field loses focus, the
highlightclass is removed, reverting its background color to the original state.
Output:
- Initially, the input fields have their default background color.
- When an input field is clicked (focused), its background color changes to light blue.
- When the input field is clicked outside (blurred), its background color reverts to the original.
Example 2: Toggle Visibility of a Section
You might want to toggle the visibility of a section, such as a sidebar or additional content, based on user interaction. This can be done using the .toggle() method.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Toggle Section Visibility</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>#extraContent {
display: none;
padding: 20px;
background-color: #f0f0f0;
border: 1px solid #ccc;
}</style></head>
<body>
<button id="toggleButton">Show/Hide Extra Content</button>
<div id="extraContent">
<p>This is some extra content that can be toggled.</p>
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</html>
Explanation:
- Initially, the extra content section is hidden.
- When the “Show/Hide Extra Content” button is clicked, the visibility of the extra content section is toggled using the
.toggle()method.
Output:
- Initially, the extra content is hidden.
- Clicking the button will show or hide the extra content each time.
Example 3: Changing the Style of a List Item on Hover
To enhance user experience, you might want to change the style of list items when the user hovers over them. This can be done by applying different CSS properties on mouse hover.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>List Item Hover Effect</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.list-item {
padding: 10px;
border-bottom: 1px solid #ddd;
}
.hover-effect {
background-color: #f1f1f1;
color: #333;
}</style></head>
<body>
<ul>
<li class="list-item">Item 1</li>
<li class="list-item">Item 2</li>
<li class="list-item">Item 3</li>
<li class="list-item">Item 4</li>
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</html>
Explanation:
- When a list item is hovered over, the
hover-effectclass is added, changing its background color and text color. - When the mouse leaves the list item, the
hover-effectclass is removed, reverting to the original styles.
Output:
- Initially, the list items have their default styles.
- When a list item is hovered over, its background color changes to light gray and text color to dark gray.
- When the mouse leaves the list item, the styles revert to the original.
Example 4: Dynamically Changing the Style of a Button
Sometimes, you may want to dynamically change the style of a button based on certain conditions or user actions. This can be achieved using the .css() method.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Change Button Style</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>#styledButton {
padding: 10px 20px;
background-color: #007bff;
color: white;
border: none;
cursor: pointer;
}</style></head>
<body>
<button id="styledButton">Styled Button</button>
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</html>
Explanation:
- Initially, the styled button has a blue background, white text, and no border.
- When the “Change Style” button is clicked, the background color, text color, and border of the styled button are changed using the
.css()method.
Output:
- Initially, the styled button has a blue background and white text.
- After clicking the “Change Style” button, the styled button’s background color changes to green, text color to yellow, and a yellow border is added.
Applying CSS styles with jQuery is a powerful technique that enhances the interactivity and responsiveness of web pages. By using methods like .css(), .width(), .height(), .offset(), and .position(), developers can dynamically adjust the appearance and positioning of elements based on user actions or other conditions. Additionally, animating CSS properties with jQuery allows for smooth transitions and visual effects that improve the user experience.Happy coding !❤️