How to Look-up elements with $() in html WebPage.mp4

In HTML, the $() function is commonly associated with jQuery, a JavaScript library that simplifies DOM manipulation. If you're looking to select or "look up" elements on an HTML page using $(), here's how you can do it:

Basic Usage of `$()` in jQuery

Select by Element Type:
- To select all elements of a certain type (e.g., all <div> elements), you can use:
```
javascript
$('div');
```
Select by Class:
- To select all elements with a specific class (e.g., all elements with the class .my-class), use:
```
javascript
$('.my-class');
```
Select by ID:
- To select a single element by its ID (e.g., an element with the ID #my-id), use:
```
javascript
$('#my-id');
```
Select by Attribute:
- To select elements based on attributes (e.g., all elements with the attribute type="text"), use:
```
javascript
$('[type="text"]');
```
Select Nested Elements:
- You can select nested elements. For example, all <p> elements inside a div with class .container:
```
javascript
$('.container p');
```
Chaining Methods:
- jQuery allows chaining multiple methods to manipulate the selected elements. For example, to select all <p> elements with class .text, then change their text:
```
javascript
$('p.text').text('New text!');
```

Example in an HTML Document

Here’s an example of using $() to select and manipulate elements on a webpage:

HTML:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery Example</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
    <div class="content">
        <p class="text">This is a paragraph.</p>
        <button id="btn">Click me</button>
    </div>

    <script>
        $(document).ready(function() {
            // Select element by class
            $('.text').css('color', 'blue'); // Changes text color of all .text paragraphs

            // Select element by ID and add a click event
            $('#btn').click(function() {
                alert('Button clicked!');
            });
        });
    </script>
</body>
</html>

Without jQuery: Using Native JavaScript

If you're not using jQuery, you can achieve similar results with vanilla JavaScript, using methods like document.querySelector() or document.querySelectorAll():

javascript
// Select an element by ID
let element = document.querySelector('#my-id');

// Select all elements by class
let elements = document.querySelectorAll('.my-class');

In summary, $() in jQuery allows easy selection and manipulation of DOM elements based on CSS selectors, making it very popular for web development tasks. If you're using plain JavaScript, you'll rely on methods like querySelector() and querySelectorAll() for similar functionality.

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