There are two key steps to create and insert a DOM element: 1. Create an element and set properties and content using document.createElement(); 2. Insert to the page with appendChild(), insertBefore(), or insertAdjacentElement(). When creating, you can add text, ID, and class names. After inserting, you can also bind events and set styles. It is recommended to use class to control styles for maintenance. Common problems include incorrect insertion, style conflicts, or elements are not visible. It is recommended to use developer tools to check, add border debugging, and avoid duplicate IDs.

It is not difficult to create a DOM element and insert a page. The core is to use JavaScript to dynamically generate the element and then add it to a certain position on the page. There are two key steps: creating elements and inserting pages.

The following are a few common operations to explain how to implement it.

Basic methods to create elements

The most common way to use the document.createElement() method in JS is to use the document.createElement() method. This method receives a string parameter indicating the name of the tag to be created.

For example, you want to create a <div> :<pre class='brush:php;toolbar:false;'> const newDiv = document.createElement(&amp;#39;div&amp;#39;);</pre><p> You can also set properties and contents for it:</p><pre class='brush:php;toolbar:false;'> newDiv.textContent = &amp;#39;This is a new div&amp;#39;; newDiv.id = &amp;#39;myDiv&amp;#39;; newDiv.classList.add(&amp;#39;highlight&amp;#39;);</pre><p> This way you get a div element with content, ID and class name.</p><hr /><h3 id="Common-ways-to-insert-elements-into-pages"> Common ways to insert elements into pages</h3><p> Once the element is available, the next step is to insert it into the page. There are several commonly used insertion methods, depending on where you want to insert:</p><ul><li> <strong><code>appendChild() : Add to the end of the parent element

For example, add newDiv created above to the end of the body:

 document.body.appendChild(newDiv);

If you want to insert it in front of an element, you can do this:

 const existingElement = document.getElementById('someExistingId');
existingElement.parentNode.insertBefore(newDiv, existingElement);

Don't forget to set styles and event listening

Although the newly created elements are complete, they may also need to bind click events or set inline styles.

For example, add click effect:

 newDiv.addEventListener('click', function() {
  alert('You clicked on this new element');
});

You can change the style attribute directly by setting the style:

 newDiv.style.color = 'red';
newDiv.style.fontSize = '16px';

However, the more recommended approach is to control the style through class, which makes it easier to maintain.

Some small details in actual development

Sometimes newbies will encounter problems, such as elements are clearly created but not displayed. This is usually because:

• Not inserted into the document stream correctly (for example, append to a non-existent container)
• Style conflicts or overwritten by other CSS
• Elements were created but not set in height or color, which made them invisible

So suggestion:

• Use browser developer tools to check if element is actually inserted successfully
• Add borders or background colors to elements for easy debugging
• Avoid duplicate IDs or wrong selectors

Basically that's it. By mastering these steps, you can easily operate the page structure dynamically.