How to replace tags with jquery

With the continuous development of front-end technology, more and more websites are beginning to use jQuery to handle DOM operations of HTML pages. Among them, replacing tags is a commonly used method in jQuery. This article will introduce how to use jQuery to replace tags.

1. Basic usage of jQuery replacement tag

First, let’s take a look at the basic usage of jQuery replacement tag. There are two main methods for replacing tags in jQuery: replaceWith() and replaceAll().

1. replaceWith() method

ThereplaceWith() method is used to replace selected elements with specified HTML or DOM elements. The specific usage is as follows:

$(selector).replaceWith(content)

Among them, selector is the CSS selector of the selected element, and content is the content to be inserted into the selected element, which can be an HTML tag, DOM element or jQuery object.

The following is an example where we replace the selected element p with a paragraph with the content "This is a new paragraph".

$(document).ready(function(){
  $("p").replaceWith("<p>这是一个新段落。</p>");
});

2. replaceAll() method

ThereplaceAll() method is used to replace the specified element with the selected element. The specific usage is as follows:

$(selector).replaceAll(content)

Among them, selector is the CSS selector of the element to be replaced, and content is the content to be replaced, which can be an HTML tag, DOM element or jQuery object.

The following is an example where we replace all elements with the ID "id1" with a new paragraph.

$(document).ready(function(){
  $("<p>这是一个新段落。</p>").replaceAll("#id1");
});

2. Advanced applications of jQuery replacement tags

In addition to basic usage, jQuery replacement tags have many advanced applications. Below, we will introduce some commonly used advanced applications.

1. Record the original state

Sometimes, we need to record the original state of an element before replacing the tag so that it can be restored when needed. To do this, we can use the clone() method to create a copy of the selected element and call the detach() method to delete it from the document.

var p = $("p");
var old_p = p.clone().detach();

2. Automatically add closing tags

When using the replaceWith() method to replace tags, if we do not add a closing tag for the new element, the replaced code may An error occurred. In order to avoid this situation, we can pre-define global variables to store the list of tags that need to automatically add closing tags.

var selfClosingTags = ['img', 'link', 'input'];

Then, when calling the replaceWith() method, we can automatically add the closing tag as needed.

var new_element = $("<img>", {src: "test.jpg"});
if ($.inArray(new_element.prop("tagName").toLowerCase(), selfClosingTags) == -1) {
  new_element.append("</" + new_element.prop("tagName") + ">");
}
$("p").replaceWith(new_element);

3. Exchange between multiple elements

In some cases, we may need to exchange the positions between multiple elements. To do this, we can remove these elements from the document using the detach() method and insert them after other elements using the insertAfter() method.

var element1 = $("#element1").detach();
var element2 = $("#element2").detach();
element1.insertAfter($("#target"));
element2.insertAfter(element1);

3. Summary

Through the introduction of this article, we can see that jQuery replacement tags can help us quickly perform DOM operations in HTML pages. Whether it is basic usage or advanced applications, mastering them can allow us to complete website development work more efficiently. Therefore, it is recommended that developers make more use of it in daily development to improve development efficiency.

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