Getting Started with jQuery: Simply Learn to Adjust Attribute Values

Getting Started with jQuery: Simply Learn to Adjust Attribute Values

jQuery is a JavaScript library widely used in web development. It can simplify the operations and events of HTML documents. processing, animation effects, etc. When using jQuery, adjusting element attribute values ​​is a common and important operation. Through this article, we will learn how to use jQuery to manipulate the attribute values ​​​​of elements and provide specific code examples.

1. Introduction of jQuery library

Before starting to learn jQuery, you first need to introduce the jQuery library into the HTML document. You can introduce the jQuery library in the following ways:

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>

2. Basic syntax: Select elements

In jQuery, select the elements that need to be operated through the selector. For example, select an element through the id selector:

$("#elementId")

Select the element through the class selector:

$(".className")

Select the element through the label selector:

$("tagName")

3. Manipulate attribute values

1. Get the attribute value

We can use the attr() method to get the attribute value of the element. The following is an example of getting the src attribute value of an element:

var srcValue = $("#image").attr("src");

2. Set the attribute value

Use the attr() method to also set the element's attribute value. The following is an example of changing the src attribute value of an element to a new path:

$("#image").attr("src", "newImagePath.jpg");

3. Removing attributes

If we need to remove a specific attribute of an element, You can use the removeAttr() method. For example, remove the href attribute of a link element:

$("a").removeAttr("href");

4. Specific examples

Suppose we have an HTML document containing an image and a button. We will change the image by clicking the button. src attribute value. The following is the sample code:

    
    
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>


    
    Change Image

    <script>
        $(document).ready(function(){
            $("#changeBtn").click(function(){
                $("#image").attr("src", "newImage.jpg");
            });
        });
    </script>

In the above example, when the button is clicked, the src attribute value of the image will be modified to "newImage.jpg".

Summary: Through this article, you have simply learned how to use jQuery to operate the attribute values ​​​​of elements, including obtaining attribute values, setting attribute values, removing attributes, etc. I hope readers can deepen their understanding of jQuery attribute value adjustment through this article. Understand and further master jQuery usage skills.

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