How to set the value of append using jQuery

In web development, we often need to use JavaScript to dynamically operate DOM elements. One of the common operations is to add new HTML content inside an element. jQuery is a very popular JavaScript library that simplifies DOM manipulation and is very convenient to use. In jQuery, we can use the append() method to add HTML content. Next, we will explain in detail how to use jQuery to set the value of append.

1. Introduction to the append() method

append() is one of the most basic DOM insertion methods in jQuery, used to insert new HTML content at the end of the specified element. Its syntax is as follows:

$(selector).append(content,function(index,html));

Among them, selector is used to specify the element into which HTML content needs to be inserted, which can be a CSS selector, HTML element, jQuery object, etc.; content is the HTML content to be inserted, which can be pure Text, HTML code, jQuery objects, etc.; function(index,html) is an optional callback function that is called when content is inserted at the end of each matching element.

2. Set the value of append

If we want to use the append() method to set the content of the element, we need to pay attention to the following points:

1. Get the jQuery of the element Object: Before using the append() method, we need to obtain the jQuery object of the element to which HTML content needs to be added. This can be done through a selector, for example:

var $container = $('.container');

2. Create HTML content: Next, we need to create the HTML content to be added. HTML content can be created using strings, jQuery objects, or DOM elements.
3. Use the append() method to add HTML content: Finally, we can use the append() method to add the created HTML content to the inside of the target element. For example:

$container.append('<div>这是一个新的div元素</div>');

In addition to directly passing in HTML code, we can also use variables, loops, etc. to dynamically generate HTML content. For example:

var htmlStr = '';
for (var i = 0; i < 10; i++) {
  htmlStr += &#39;<li>这是第' + (i+1) + '个li元素</li>';
}
$container.append(htmlStr);

3. Frequently Asked Questions

When using the append() method, we need to pay attention to the following points:

1. Repeated addition: If we add multiple times Use the append() method to add the same element, and it will be added multiple times. This can be avoided by using the appendTo() method.

$('<div>这是一个新的div元素</div>').appendTo($container);

2. Insertion position: The append() method adds new HTML content to the end of the last child element of the target element by default. If you want to add HTML content to the front of the target element, you can use the prepend() method.
3. Event delegation: When using the append() method to add HTML content, the newly added elements may not be able to bind events, and event delegation needs to be used to solve this problem.

$container.on('click', 'li', function() {
  // ...
});

4. Summary

In this article, we introduced the basic usage of the append() method in jQuery and the method of setting values. As one of the essential DOM manipulation methods in web development, it allows us to easily dynamically add HTML content and enhance the interactivity and readability of the page. When using the append() method, we need to pay attention to issues such as different insertion locations, repeated additions, and event delegation. By deeply understanding jQuery's DOM operation methods, we can develop web pages with excellent interactive experience more efficiently.

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