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JavaScript JavaScript and the DOM (Retiring) Making Changes to the DOM Removing an Element from the DOM

Olive Bamurange
Olive Bamurange
5,174 Points

Let's remove a list item from the unordered list. First, select the <ul> element and store it in the variable myList.

Hi folks, I am getting confused of where and when to Use document.getElementsByTagName and document.querySelector. I knew each one what it does but specifically on this question, I don't understand why on google other people use document.querySelector

app.js
let myList = document.getElement('ul');
let firstListItem = document.querySelector('li:firstItem);
myList.removeChild(firstListItem);
index.html
<!DOCTYPE html>
<html>
    <head>
        <title>DOM Manipulation</title>
    </head>
    <link rel="stylesheet" href="style.css" />
    <body>
        <ul>
            <li id="first">First Item</li>
            <li id="second">Second Item</li>
            <li id="third">Third Item</li>
        </ul>
        <script src="app.js"></script>
    </body>
</html>

4 Answers

For task 1:

If you use document.getElementsByTagName the feedback received is: You've stored a collection in 'myList'. Make sure that you select a single element. You can do this by including an index:

let myList = document.getElementsByTagName('ul')[0];

On the other hand document.querySelector will select the first element that matches so no index is needed.

let myList = document.querySelector('ul');

For task 2:

You are to select the <li> with the ID first and store it in the variable firstListItem. Since you are provided with an id the easiest means is to use document.getElementById

For task 3

The code you have is correct

Olive Bamurange
Olive Bamurange
5,174 Points

Here it is how i think it should be answered. but it shows error. please help me and I will appreciate!

Olive Bamurange
Olive Bamurange
5,174 Points

Thank you@KRIS NICOLAISEN ! appreciated

var myList =document.getElementsByTagName('ul')[0]