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

Nebojsa Stevanovic
seal-mask
.a{fill-rule:evenodd;}techdegree
Nebojsa Stevanovic
Full Stack JavaScript Techdegree Student 9,620 Points

i don't quite undestand what is this about these event listener is making my brain confused

could someone explain me better what's happening here please ?

app.js
let section = document.getElementsByTagName('section')[0];

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

});
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>

2 Answers

Armin Kadic
Armin Kadic
16,242 Points

INPUT needs to be in caps lock.

Steven Parker
Steven Parker
229,608 Points

You're very close, and you have the correct conditional expression.

But the code to change the color is already there, so you don't need to add code to do that part. You just need for your conditional to enclose the existing color-changing code so it only runs when the condition is true.

Nebojsa Stevanovic
seal-mask
.a{fill-rule:evenodd;}techdegree
Nebojsa Stevanovic
Full Stack JavaScript Techdegree Student 9,620 Points

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

section.addEventListener('click', (e) => {

if(e.target.tagName=='input'){

e.target.style.backgroundColor = 'rgb(255, 255, 0)';

}

});

i did this, but still is not right code.. :/

Steven Parker
Steven Parker
229,608 Points

Tag names are always upper case (you had that part right the first time).