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JavaScript JavaScript and the DOM (Retiring) Responding to User Interaction Event Delegation

Posted by arshia mohammadi
arshia mohammadi
7,657 Points

What's this challenge answer?!

In the listener that has been added to the section element, ensure that the text input elements are the only children that trigger the background-changing behavior.

index.html 
<!DOCTYPE html>
<html>
    <head>
        <title>JavaScript and the DOM</title>
    </head>
    <link rel="stylesheet" href="style.css" />
    <body>
        <section>
            <h1>Making a Webpage Interactive</h1>
            <p>JavaScript is an exciting language that you can use to power web servers, create desktop programs, and even control robots. But JavaScript got its start in the browser way back in 1995.</p>
            <hr>
            <p>Things to Learn</p>
            <ul>
                <li>Item One: <input type="text"></li>
                <li>Item Two: <input type="text"></li>
                <li>Item Three: <input type="text"></li>
                <li>Item Four: <input type="text"></li>
            </ul>
            <button>Save</button>
        </section>
        <script src="app.js"></script>
    </body>
</html>
app.js 
let section = document.getElementsByTagName('section')[0];

section.addEventListener('click', (e) => {
  e.target.style.backgroundColor = 'rgb(255, 255, 0)';
});
John Greer
John Greer
Courses Plus Student 759 Points
John Greer
John Greer
Courses Plus Student 759 Points

I don't know what this answer means. It sounds like my code that doesn't work:

let section = document.getElementsByTagName('section');

section.addEventListener('click', (e) => { if(e.target.tagName == 'INPUT'){ e.target.style.backgroundColor = 'rgb(255, 255, 0)'; } });

1 Answer

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

Probably the easiest way to solve this challenge is to wrap the assignment statement in a conditional ("if") that tests what kind of element triggered the event. The "tagName" property of the event target should be "INPUT". It's not necessary to also check the type since all the input elements are text inputs.

arshia mohammadi
arshia mohammadi
7,657 Points

It would be great if you write this in code

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

The whole point of the challenge is to give you the experience of writing the code. Give it your best shot, and if you still have trouble passing the challenge, post the code you've added here and we can give you some more specific pointers for fixing it.