jquery dynamically adds and deletes elements

With the continuous advancement of Web technology, dynamically adding and deleting DOM elements has become one of the commonly used technologies in front-end development, especially in jQuery. Through key functions and methods, we can very conveniently implement DOM elements. Add or delete. This article will introduce the relevant knowledge and skills of dynamically adding and removing DOM elements in jQuery.

1. Dynamically add DOM elements

1.1. Create elements

In jQuery, you can use the $() function or its alias jQuery() function to create a new element object. For example:

<code>var $newElement = $("<div></div>");</code>

This line of code creates a new div element and assigns the element to the variable $newElement. In jQuery, a variable name beginning with $ usually indicates that the variable is a jQuery object.

1.2. Setting and getting element attributes

You can use the attr() method to set and get the attributes of elements. For example:

<code>//设置id属性为"test"
$newElement.attr("id", "test");

//获取id属性
var idValue = $newElement.attr("id");</code>

1.3. Add to parent element

You can use the appendTo() method to add a new element to a parent element. For example:

<code>//将$newElement添加到id为"parent"的元素中
$newElement.appendTo("#parent");</code>

1.4. Insert into the specified position

You can use the insertAfter() method or before() method to insert the element into the specified position. For example:

<code>//将$newElement插入到id为"old"的元素后面
$newElement.insertAfter("#old");

//将$newElement插入到id为"old"的元素前面
$newElement.before("#old");</code>

2. Dynamically delete DOM elements

2.1. Delete from the parent element

You can use the remove() method to delete the element from the parent element. For example:

<code>//删除id为"test"的元素
$("#test").remove();</code>

2.2. Delete all child elements

You can use the empty() method to delete all child elements of the element. For example:

<code>//删除id为"parent"元素中的所有子元素
$("#parent").empty();</code>

3. Summary

Through the above introduction, we can see that the method of dynamically adding and deleting DOM elements in jQuery is very flexible and convenient, and is widely used. For development scenarios that require frequent manipulation of DOM elements, these technical points are undoubtedly very helpful.

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