How to modify the selected state in jquery

Jquery method to modify the selected state: 1. Use the addClass and removeClass methods to add multiple class names to the selected element, thereby changing its style or state; 2. Use the toggleClass method to add multiple class names to the selected element. Add or remove a class name. If the class name already exists, it will be removed, otherwise it will be added; 3. Use the attr method to get or set the attribute value of the element; 4. Use the prop method to Set Boolean type attribute values ​​according to specific needs, etc.

The operating environment of this article: Windows 10 system, jQuery3.7.0 version, Dell G3 computer.

JQuery is a popular JavaScript library used to simplify the manipulation and event handling of HTML documents. There are several ways to modify the selected state when using JQuery.

Use the addClass and removeClass methods:

By using the method, you can add one or more class names to the selected element, thereby changing its style or state. For example, you can use the following code to add a class name "selected" to the selected element:

$(selector).addClass("selected");

Conversely, you can use the removeClass method to remove the class of the selected element ```javascript

$(selector).removeClass("selected");

You can easily change the style or state of elements by adding or removing class names.

Use the toggleClass method:

The toggleClass method can add or remove a class name on the selected element. If the class name already exists, it will be removed. Otherwise it will be added. This method can be used to toggle the state of the selected element. For example, you can use the following code to switch the class of the selected element:

$(selector).toggleClass("selected");

If the selected element already has the class name "selected", then this class name will be removed; if the selected element does not have the class name "selected" , then the class name will be added.

Use the attr method:

The attr method can be used to get or set the attribute value of the element. By setting the attribute value of the selected element, you can change its state. For example, you can use the following code to set the attribute value of the selected element:

$(selector).attr("selected", "true");

This will set the "selected" attribute of the selected element to "true". Based on specific needs, different attribute values ​​can be set to change the status of the selected element.

Use the prop method:

The prop method is similar to the attr method and is used to get or set the attribute value of the element. However, the prop method is more suitable for handling Boolean properties, such as "checked", "disabled", etc. By setting the attribute value of the selected element, you can change its state. For example, you can use the following code to set the attribute value of the selected element:

$(selector).prop("checked", true);

This will set the "checked" attribute of the selected element to true. According to specific needs, different attribute values ​​can be set to change the status of the selected element.

Summary:

JQuery provides a variety of methods to modify the selected state. You can use the addClass and removeClass methods to add or remove class names, use the toggleClass method to switch class names, use the attr method to set attribute values, and use the prop method to set Boolean attribute values. Choose the appropriate method according to specific needs. Change the style or state of the selected element.

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