# "Arrays" in the DOM

## Completed Code

**HTML**

```markup
<!DOCTYPE html>
<html>
<body>
    <h1>DOM CHALLENGE!</h1>
    <p>I believe in you!</p>
    <h4>You can do it!</h4>
    <p>Just Think</p>
    <h1>Well, what's your answer?</h1>
    <button onClick="myFunction()">Click me!</button>
<script src="arrDom.js"></script>
</body>
</html>
```

**JavaScript**

```javascript
function myFunction() {
    var myNodelist = document.querySelectorAll("p");
    var i;
    for (i = 0; i < myNodelist.length; i++) {
        myNodelist[i].style.color = "blue";
        myNodelist[i].style.fontStyle ="italic";
    }
}
```

## NodeList

The main component of this challenge is a **NodeList**. A **NodeList** is very similar to an **HTMLCollection** in that both return **array-like objects**. NodeLists differ in that they can only be accessed by their **index number** and can contain **attribute nodes and text nodes**. That's why we are able to change the color and style of our `<p>` tags. Please note, **a NodeList is NOT an Array**. It **looks** like an array, and can be **referenced** like an array, but you **CANNOT** use **array methods** on a NodeList.

## Explanation

* **document.querySelectorAll("p")** - all `<p>` tags in the HTML are selected.
* **For Loop** - The text is changed to **blue** and put in *italics* for each `<p>` tag.

## open-in-browser

If you don't have it already, install the **open-in-browser** extension by **coderfree** to run HTML from VS Code. Once you have it installed, make sure you are on your `.html` page and then type `ctrl+alt+o` on **Windows** or `cmd+alt+o` on **Mac** to select a browser to run the HTML in. `Ctrl+K` and then `D` (hold ctrl and k, release and press d) runs the HTML in your default browser. I would assume Mac users need to just use `cmd` instead of `ctrl`.

## Output

Here's the proper output after clicking the button.&#x20;

![Array Dom](https://1575703339-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LAU8YfvX8hu45TN4Mbg%2F-LAU8dkOiW5hvJBP1l-_%2F-LAU8rlzJW-8-1dOir8F%2FarrayDom.PNG?generation=1524162331561362\&alt=media)
