How to create a node in jquery

jQuery is a simple and efficient JavaScript library that makes it easier to manipulate HTML documents. In actual development, we often need to create new nodes and add them to the document.

This article will introduce how to use jQuery to create a new node and add it to the document.

1. Create a new node

jQuery provides a createElement() method to create a new node. This method accepts one parameter, which represents the tag name of the element to be created.

For example, to create a new div element, you can use the following code:

var newDiv = $("<div>");

In the above code, we use the $() method to create a new jQuery object and add it to Assign a value to the variable newDiv. Since we are not passing any parameters in the $() method, an empty div element is created.

2. Set node attributes

After creating a new node, we can set the node attributes, such as id, class, style, etc. jQuery provides some methods to set these properties, such as attr(), addClass(), css(), etc.

For example, to add an id attribute to a newly created div element, you can use the following code:

var newDiv = $("<div>").attr("id", "myDiv");

In the above code, we use the attr() method to set the id attribute of the newDiv object for "myDiv".

3. Add child nodes

After creating a new node and setting its properties, we may need to add it to the document. Here are two situations to introduce how to add.

1. Add to the end of the parent node

If we want to add the node to the end of an existing parent node, we can use the append() method of the parent node.

For example, to add the newDiv element created in the above code to the end of the body element, you can use the following code:

$("body").append(newDiv);

In the above code, we use the append() method to add the newDiv element Added to the end of the body element.

2. Add to the specified position

If we need to add a node to a specified position of an existing parent node, we can use the parent node's insertBefore() or insertAfter( )method.

For example, to add the newDiv element created in the above code before the first child node of the body element, you can use the following code:

$("body").children().first().before(newDiv);

In the above code, we first use children( ) method to get all child nodes of the body element, then use the first() method to get the first child node, and use the before() method to add the newDiv element before the first child node.

4. Summary

Through the introduction of this article, we learned how to use jQuery to create a new node and add it to the document. We can create a new node through the createElement() method, set node attributes through attr(), addClass(), css() and other methods, and add nodes through append(), insertBefore(), insertAfter() and other methods. into the document. Mastering these methods can help us operate HTML documents quickly and efficiently.

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