Summarize the method of batch setting HTML element attributes in jQuery

In front-end development, it is often necessary to batch set styles, attributes, etc. on HTML elements to improve development efficiency. As a JavaScript library, jQuery provides a variety of convenient methods to batch set multiple elements.

This article will introduce the method of batch setting HTML element attributes in jQuery, making your daily development more convenient and efficient.

1. Attr method

The attr() method is one of the most commonly used methods to set HTML element attributes in jQuery. It can set the same attribute value of multiple elements at the same time. For example, suppose we want to set the type attribute of all input elements in a page to text. We can write like this:

$('input').attr('type', 'text');

With this code, jQuery will select all input elements and put them The type attribute is set to text. If we only need to set the type attribute of a certain category of input elements, we can write like this:

$('.my-class input').attr('type', 'text');

Here, all input elements under the container with class my-class are selected, and their type attributes are set to text.

2. Prop method

The prop() method is another method in jQuery for setting element attributes. Different from the attr() method, the prop() method is more suitable for setting boolean type attributes, such as checked, disabled, selected, etc.

For example, if we want to disable all checkbox elements in a page, we can write like this:

$('input[type="checkbox"]').prop('disabled', true);

Here all input elements with the type attribute set to checkbox are selected, and Their disabled attribute is set to true.

3. addClass, removeClass, and toggleClass methods

If we need to add or remove classes from multiple elements, we can use the addClass, removeClass, and toggleClass methods provided by jQuery.

For example, if we want to add the class big-title to all h1 elements, we can write like this:

$('h1').addClass('big-title');

Similarly, if we want to delete all h1 elements with the class big- title, you can write it like this:

$('h1').removeClass('big-title);

If we want to switch the class of all h1 elements to big-title, you can write it like this:

$('h1').toggleClass('big-title');

Here, if the h1 element does not have big-title originally title class, this class will be added; if there is already a big-title class, this class will be deleted.

4. CSS method

If we need to set styles for multiple elements, we can use the css method provided by jQuery. For example, if we want to set the text color of all p elements to red, we can write like this:

$('p').css('color', 'red');

Similarly, if we want to set the background color of all h1 elements to yellow, we can write like this:

$('h1').css('background-color', 'yellow');

Summary

Through the above introduction, we can see that jQuery provides a variety of convenient methods to batch set multiple HTML elements. Using these methods, we can easily set element attributes, add and delete classes, set styles, etc. to improve daily development efficiency.

Of course, what is introduced here is only the more commonly used methods. If you want to know more about jQuery usage skills, you can refer to official documents or related books.

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