Retrieving Content

In this chapter, we'll explore the various ways to retrieve content from HTML elements using jQuery. Whether you're accessing text, HTML, or attribute values, jQuery provides several methods to make this task easy and efficient. We'll cover the basic to advanced techniques, providing practical examples along the way to ensure you fully grasp the concepts.

Introduction to Retrieving Content

Why Retrieve Content?

Retrieving content from HTML elements is a fundamental task in web development. It allows you to get the current state of elements, which can be useful for validation, processing data, or updating other parts of the web page dynamically.

Key Methods for Retrieving Content

jQuery offers a variety of methods to retrieve different types of content:

  • .text()
  • .html()
  • .val()
  • .attr()

Retrieving Text Content

The .text() Method

The .text() method retrieves the combined text contents of the specified elements, including their descendants.

				
					$(selector).text();

				
			
				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Retrieve Text Content</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
    <p id="paragraph">Hello, <span>world!</span></p>
    <button id="getTextButton">Get Text</button>
    <p id="output"></p> <script type="litespeed/javascript">$(document).ready(function(){$("#getTextButton").click(function(){var textContent=$("#paragraph").text();$("#output").text("Retrieved text: "+textContent)})})</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 “Get Text” button is clicked, the .text() method retrieves the text content of the paragraph, including the text inside the <span> element.
  • The retrieved text is then displayed in the output paragraph.

Output:

  • The output paragraph displays: “Retrieved text: Hello, world!”

Retrieving HTML Content

The .html() Method

The .html() method retrieves the HTML content of the specified elements, including their descendants.

				
					$(selector).html();

				
			
				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Retrieve HTML Content</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
    <div id="contentDiv">
        <p>Hello, <span>world!</span></p>
    </div>
    <button id="getHtmlButton">Get HTML</button>
    <p id="htmlOutput"></p> <script type="litespeed/javascript">$(document).ready(function(){$("#getHtmlButton").click(function(){var htmlContent=$("#contentDiv").html();$("#htmlOutput").text("Retrieved HTML: "+htmlContent)})})</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 the “Get HTML” button is clicked, the .html() method retrieves the HTML content of the #contentDiv, including the paragraph and span elements inside it.
  • The retrieved HTML content is then displayed in the output paragraph.

Output:

  • The output paragraph displays: “Retrieved HTML: <p>Hello, <span>world!</span></p>”

Retrieving Form Values

The .val() Method

The .val() method retrieves the current value of form elements such as input, select, and textarea.

				
					$(selector).val();

				
			
				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Retrieve Form Value</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
    <input type="text" id="textInput" value="Hello, world!">
    <button id="getValueButton">Get Value</button>
    <p id="valueOutput"></p> <script type="litespeed/javascript">$(document).ready(function(){$("#getValueButton").click(function(){var inputValue=$("#textInput").val();$("#valueOutput").text("Retrieved value: "+inputValue)})})</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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Delayed"),litespeed_ui_events.forEach(e=>{window.removeEventListener(e,litespeed_load_delayed_js_force,{passive:!0})}),document.querySelectorAll("iframe[data-litespeed-src]").forEach(e=>{e.setAttribute("src",e.getAttribute("data-litespeed-src"))}),"loading"==document.readyState?window.addEventListener("DOMContentLoaded",litespeed_load_delayed_js):litespeed_load_delayed_js()}litespeed_ui_events.forEach(e=>{window.addEventListener(e,litespeed_load_delayed_js_force,{passive:!0})});async function litespeed_load_delayed_js(){let t=[];for(var d in document.querySelectorAll('script[type="litespeed/javascript"]').forEach(e=>{t.push(e)}),t)await new Promise(e=>litespeed_load_one(t[d],e));document.dispatchEvent(new Event("DOMContentLiteSpeedLoaded")),window.dispatchEvent(new Event("DOMContentLiteSpeedLoaded"))}function litespeed_load_one(t,e){console.log("[LiteSpeed] Load ",t);var 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 Value” button is clicked, the .val() method retrieves the current value of the text input field.
  • The retrieved value is then displayed in the output paragraph.

Output:

  • The output paragraph displays: “Retrieved value: Hello, world!”

Retrieving Attribute Values

The .attr() Method

The .attr() method retrieves the value of the specified attribute from the first element in the set of matched elements.

				
					$(selector).attr(attributeName);

				
			
				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Retrieve Attribute Value</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
    <img data-lazyloaded="1" src="data:image/gif;base64,R0lGODdhAQABAPAAAMPDwwAAACwAAAAAAQABAAACAkQBADs=" decoding="async" id="image" data-src="image.jpg" alt="Sample Image">
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</html>

Explanation:

  • When the “Get Attribute” button is clicked, the .attr() method retrieves the value of the src attribute from the #image element.
  • The retrieved attribute value is then displayed in the output paragraph.

Output:

  • The output paragraph displays: “Retrieved src attribute: image.jpg”

Advanced Content Retrieval

Retrieving Data Attributes

jQuery’s .data() method allows you to retrieve custom data attributes (using the HTML5 data-* attributes).

				
					$(selector).data(attributeName);

				
			
				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Retrieve Data Attributes</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> </head>
<body>
    <div id="dataDiv" data-info="Extra Information">Hover over me</div>
    <button id="getDataButton">Get Data</button>
    <p id="dataOutput"></p> <script type="litespeed/javascript">$(document).ready(function(){$("#getDataButton").click(function(){var dataInfo=$("#dataDiv").data("info");$("#dataOutput").text("Retrieved data attribute: "+dataInfo)})})</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 “Get Data” button is clicked, the .data() method retrieves the value of the data-info attribute from the #dataDiv element.
  • The retrieved data attribute value is then displayed in the output paragraph.

Output:

  • The output paragraph displays: “Retrieved data attribute: Extra Information”

Retrieving Multiple Values

In this example, we retrieve multiple values from a form and display them together.

				
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<html lang="en">
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    <meta charset="UTF-8">
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<body>
    <input type="text" id="firstName" placeholder="First Name">
    <input type="text" id="lastName" placeholder="Last Name">
    <button id="getValuesButton">Get Values</button>
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</html>

Explanation:

  • We use the .val() method to retrieve the values of both text input fields.
  • When the “Get Values” button is clicked, the retrieved values are displayed together in the output paragraph.

Output:

  • Initially, the text input fields are empty.
  • Entering values in the fields and clicking the “Get Values” button changes the output paragraph to display the retrieved values.

Retrieving content with jQuery is a crucial aspect of interacting with web pages dynamically. By using methods such as .text(), .html(), .val(), and .attr(), you can easily access and manipulate the content and attributes of HTML elements. Additionally, advanced techniques like using .data() for custom data attributes further enhance the flexibility and power of jQuery in content retrieval.Happy coding !❤️

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