GeezerVison

Summary: in this tutorial, you’ll learn how to use the JavaScript append() method to insert a set of Node objects or DOMString objects after the last child of a parent node.

Introduction to JavaScript append() method #

The parentNode.append() method inserts a set of Node objects or DOMString objects after the last child of a parent node:

parentNode.append(...nodes);
parentNode.append(...DOMStrings);

The append() method will insert DOMString objects as Text nodes.

Note that a DOMString is a UTF-16 string that maps directly to a string.

The append() method has no return value. It means that the append() method implicitly returns undefined.

JavaScript append() method examples #

Let’s take some examples of using the append() method.

1) Using the append() method to append an element example #

Suppose that you have the following ul element:

<ul id="app">
    <li>JavaScript</li>
</ul>

The following example shows how to create a list of li elements and append them to the ul element:

let app = document.querySelector('#app');

let langs = ['TypeScript','HTML','CSS'];

let nodes = langs.map(lang => {
    let li = document.createElement('li');
    li.textContent = lang;
    return li;
});

app.append(...nodes);

Output HTML:

<ul id="app">
    <li>JavaScript</li>
    <li>TypeScript</li>
    <li>HTML</li>
    <li>CSS</li>
</ul>

How it works:

• First, select the ul element by its id by using the querySelector() method.
• Second, declare an array of languages.
• Third, for each language, create a new li element with the textContent is assigned to the language.
• Finally, append li elements to the ul element by using the append() method.

2) Using the append() method to append text to an element example #

Assume that you have the following HTML:

<div id="app"></div>

You can use the append() method to append a text to an element:

let app = document.querySelector('#app');
app.append('append() Text Demo');

console.log(app.textContent);

Output HTML:

<div id="app">append() Text Demo</div>

append vs. appendChild() #

The following table shows the differences between append() and appendChild() methods:

Summary #

• Use the parentNode.append() method to append a set of Node objects or DOMString objects after the last child node of the parentNode.

Quiz #