How to create and append elements in JS?
<p> Creating and appending elements in JavaScript is a common task when building dynamic web pages. Here's how to do it step by step, with clear and practical examples.
1. Create a New Element with document.createElement()
<p> To create a new HTML element, use document.createElement('tagname') .const newParagraph = document.createElement('p');<p> Now you have a
<p> element in memory — but it's not yet part of the page. 
<p> You can set properties like text, attributes, or styles:newParagraph.textContent = 'This is a new paragraph.'; // Or use innerHTML if you need to include HTML tags // newParagraph.innerHTML = '<strong>Bold text</strong>';
2. Append the Element to the DOM
<p> Use methods likeappendChild() or append() to add the element to an existing parent in the DOM. 
Example: Append to the body
document.body.appendChild(newParagraph);
Example: Append to a specific container
const container = document.getElementById('container'); container.appendChild(newParagraph);
<p> ?appendChild()only accepts nodes and adds one at a time.
?append()is more flexible — it can add multiple nodes and even strings.
container.append(newParagraph); // works the same here<p> You can also append multiple items:
const span = document.createElement('span'); span.textContent = 'A new span'; container.append(newParagraph, span); // append both
3. Set Attributes and Classes (Optional but Common)
<p> Before appending, you might want to add classes or attributes:newParagraph.classList.add('highlight'); newParagraph.setAttribute('id', 'intro-text'); // Or set styles directly newParagraph.style.color = 'blue';
4. Complete Example: Create and Append a List Item
// Step 1: Create elements const li = document.createElement('li'); const strong = document.createElement('strong'); // Step 2: Add content strong.textContent = 'Important item'; li.appendChild(strong); // Step 3: Add to the list const ul = document.querySelector('ul'); ul.append(li);<p> This would add
<li><strong>Important item</strong></li> to your unordered list.Bonus: Inserting Before or at a Specific Position
<p> UseinsertBefore() or before() / after() for more control.const firstItem = ul.children[0]; ul.insertBefore(li, firstItem); // insert new li before the first item<p> Or use
before() to insert before a specific element:firstItem.before(li);
Key Takeaways
- Use
document.createElement()to make a new element. - Modify it (text, class, attributes) before or after creation.
- Use
appendChild()orappend()to add it to the DOM. -
append()is more modern and flexible;appendChild()is older but widely supported.
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