jquery after method

JQuery is one of the most popular JavaScript frameworks currently used by front-end developers. Its power lies in providing a series of methods and properties. These methods and properties bring great convenience when operating HTML and CSS. And JQuery’s after() method is also one of the best.

What is the after() method?

In JQuery, the after() method is a way to insert new elements or content. It can insert new elements or append text after the selected element, thereby changing the content on the page. This method accepts any string parameter, any string that can be used in the jQuery constructor can be used as a parameter. What's more, the after() method can operate on a collection of multiple elements, allowing the new element to be inserted after all of them.

Grammar

The syntax of the after() method is as follows:

$(selector).after(content,function(){});

where , selector represents the element selector to insert new elements. Content can append elements, arrays of elements, JQuery objects, or HTML code. The Function parameter is optional, this will be executed after the content is inserted after the element.

Example

Try the following code:

HTML:

<div class="box">
  <p>这是一个段落。</p>
  <p>这是另一个段落。</p>
</div>

JavaScript:

$("p").after("<b>插入文本</b>");

This will insert after each paragraph element "Insert text" in bold.

Similarly, this method can be used in conjunction with other JQuery methods, such as using the .animate() method to set animation effects, using the .css() method to set styles, etc. For example:

 $("p").after("<b>插入文本</b>").animate({fontSize: '2em'}, 1000);

This will insert bold text after each paragraph mark and set the font size to 2em, with a fade effect appearing.

Practical application cases of the after() method

In actual development, the after() method has many usage scenarios. The following are some of the most common usages:

1. Inserting new elements

Inserting new elements is a frequently used usage of the after() method. As in the following example:

HTML:

<div id="box">
  <p>这是一个段落。</p>
  <p>这是另一个段落。</p>
</div>

JavaScript:

$("#box p").after("<h1>这里是一个新的标题</h1>");

This will add a new title tag "h1" after each paragraph element.

2. Insert footer

The after() method can also be used to add footer information at the end of the page. For example:

HTML:

<div id="box">
  <p>这是一个段落。</p>
  <p>这是另一个段落。</p>
</div>


  
这是一个页脚。

JavaScript:

$("#box").after($("#footer"));

This will insert the footer information after the box with the ID "box".

3. Batch Processing Elements

In actual development, it is often necessary to perform the same operation on multiple elements. In this case, you can use the after() method to batch process elements.

HTML:

<div class="box">
  <p>段落1</p>
</div>
<div class="box">
  <p>段落2</p>
</div>
<div class="box">
  <p>段落3</p>
</div>

JavaScript:

$(".box").after("<hr/>");

This will insert a horizontal line after each box with the ID "box".

Summary

JQuery’s after() method can help us dynamically update web page content more conveniently, insert new elements, text, styles, animations, etc. This method not only better optimizes the page code, but also simplifies and speeds up the writing and maintenance of the code, making the development and user experience easier and more enjoyable.

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