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How to delete label attributes in jquery

PHPzOriginal: 2023-05-23 15:29:392877browse

When using jQuery to operate HTML tags, you often need to add, modify or delete tag attributes. Deleting tag attributes is a common need, so how does jQuery delete tag attributes? This article will introduce methods and examples of jQuery deleting tag attributes.

1. Use the removeAttr function to delete label attributes

jQuery provides the removeAttr function, which can be used to delete label attributes. removeAttr can accept the attribute name as a parameter and delete the attribute of the specified tag. Here is a simple example of removing the tag attribute:

<!DOCTYPE html>
<html>
<head>
    <title>jQuery删除标签属性示例</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script>
        $(document).ready(function() {
            $('button').click(function() {
                $('img').removeAttr('src');
            });
        });
    </script>
</head>
<body>
    <img src="example.jpg">
    <button>删除src属性</button>
</body>
</html>

In the above example, we have an HTML page that contains an image, and there is a button. When the user clicks the button, we use the removeAttr function to delete the src attribute of the image. After clicking the button, the image will lose its source address and cannot be displayed.

2. Use the prop function to delete label attributes

In addition to the removeAttr function, the prop function can also be used to delete label attributes. The prop function is different from the removeAttr function in that it deletes the DOM attribute of the label instead of the label attribute. This has to do with the way jQuery works, which maps tag properties to the tag's DOM properties. The following is an example of using the prop function to remove tag attributes:

<!DOCTYPE html>
<html>
<head>
    <title>jQuery删除标签DOM属性示例</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script>
        $(document).ready(function() {
            $('button').click(function() {
                $('input').prop('disabled', true);
            });
        });
    </script>
</head>
<body>
    <input type="text" value="Hello World!">
    <button>禁用input</button>
</body>
</html>

In the above example, we have an HTML page that contains a text input box and a button. When the button is clicked, we use the prop function to disable the input box. The first parameter of the prop function is the name of the DOM property, and the second parameter is the new value. In this example, we set the disabled attribute of the input box to true so that it will be disabled and cannot be edited.

3. Example: Use removeAttr and prop functions to delete attributes of multiple tags

We can also use removeAttr and prop functions to delete attributes of multiple tags, for example:

<!DOCTYPE html>
<html>
<head>
    <title>jQuery删除多个标签属性示例</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script>
        $(document).ready(function() {
            $('button').click(function() {
                $('img').removeAttr('src');
                $('input').prop('disabled', true);
            });
        });
    </script>
</head>
<body>
    <img src="example-1.jpg">
    <img src="example-2.jpg">
    <input type="text" value="Hello World!">
    <input type="text" value="Hello jQuery!">
    <button>删除属性</button>
</body>
</html>

In the above example, we have two pictures and two input boxes. When the buttons are clicked, we used the removeAttr and prop functions to remove their attributes. The first function deletes the src attribute of all images, and the second function disables all input boxes. In this way, the properties of these four labels have been deleted or changed, and their status has changed.

4. Conclusion

jQuery is a very useful JavaScript library that can quickly complete various DOM operations in web development. When deleting label attributes, we can use jQuery's removeAttr and prop functions to achieve this. The use of both functions is very simple, just pass the label's attribute name as a parameter. These functions can help us quickly delete tag attributes and easily achieve our needs.

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