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Injecting one element before another with vanilla js

Yesterday, we looked at how to create an element using the document.createElement() method. Today, we’re going to learn how to inject one element before another in the DOM.

This is another short and sweet one.

You can use the Node.before() method to insert elements and strings before another element. Call the Node.before() method on the node you want to insert before, and pass in one or more new elements or strings as arguments.

<div id="app">Good evening</div>
// Create a new element
let p = document.createElement('p');
p.textContent = 'Hello!';

// Get the target node
let app = document.querySelector('#app');

// Insert the new node before the target node
// <p>Hello!</p><div id="elem">Good evening</div>

// You can inject more than one item by passing in multiple arguments
// <p>Hello!</p>What's poppin'<div id="elem">Good evening</div>
app.before(p, `What's poppin?`);

Here’s a demo.