How to delete dom elements with jquery (two methods)

In front-end development, we often need to operate Dom elements on web pages through code. One of the common requirements is to delete Dom elements. Today we will discuss how to use jQuery to delete Dom elements.

1. The basic syntax of jQuery

Before using jQuery to delete Dom elements, we need to first understand some knowledge about the basic syntax of jQuery.

1. Selector

jQuery selector is a tool used to select HTML elements. The syntax is similar to CSS selectors, and elements can be selected through different methods such as tag name, class name, ID, etc.

Commonly used selectors include the following:

(1) Tag selector: Select elements by tag name. For example: $("p") selects all p elements.

(2) Class selector: Select elements by class name. For example: $(".test") selects all elements with the class name "test".

(3) ID selector: Select elements by ID. For example: $("#test") selects the element with the ID "test".

(4) Wildcard selector: Select all elements. For example: $("*") selects all elements.

(5) Multiple selector: Select multiple elements at the same time. For example: $("p, .test") selects all p elements and elements with the class name "test".

2. Events

jQuery can easily respond to user operations, such as clicks, double-clicks, mouse movements in and out, etc. We can bind events through the .on() method.

For example:

$("button").on("click", function(){
  // 这里是事件处理函数
});

3. DOM operation

jQuery can operate DOM elements very conveniently, such as adding, deleting, changing the attributes of an element, Style etc. We can do this in different ways.

For example:

// 增加一个元素
$("body").append("<p>这是新增的元素</p>");

// 删除一个元素
$("p").remove();

// 改变某个元素的文本内容
$("p").text("新的文本内容");

// 改变某个元素的CSS样式
$("p").css("color", "red");

2. How to delete Dom elements in jQuery

There are two methods to delete Dom elements in jQuery.

1. remove() method

.remove() method will remove the selected element from the document, and will also delete the bound events and data on the element.

For example:

// 删除所有p元素
$("p").remove();

// 删除ID为test的元素
$("#test").remove();

2. empty() method

.empty() method can be used to delete the content of an element, but it will not delete the element itself. That is, this method removes the element's child elements from the document, but retains the element itself and its bound events and data.

For example:

// 删除ID为test的元素的内容
$("#test").empty();

3. Precautions for deleting Dom elements with jQuery

When using jQuery to delete Dom elements, you need to pay attention to the following points.

1. Confirm the deletion operation

Deleting a Dom element is a serious operation, and sometimes it may bring some unexpected consequences. Therefore, be sure to confirm before performing the deletion operation to avoid unnecessary errors.

2. Use the .empty() method as little as possible

The .empty() method only deletes the content of the element, not the element itself. Therefore, if you need to remove an entire element, you should use the .remove() method.

3. You need to be careful when deleting elements

Deleting Dom elements is a more dangerous operation. Once deleted, it cannot be recovered. Therefore, you must be very careful when performing deletion operations to avoid accidentally deleting important elements.

4. Summary

It is very convenient to use jQuery to delete Dom elements, and it is also common in daily development. In this article, we introduce the basic syntax of jQuery, Dom operation methods, as well as two methods and precautions for deleting Dom elements. I believe that through studying this article, everyone will be able to master the skills of deleting Dom elements with jQuery.

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