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JavaScript Regular Expressions in JavaScript Validating a Form Form Validation

Posted by danielchristie
danielchristie
21,505 Points

I am trying to complete the final question on the regex tutorial but it continues to yield an error.

I am trying to complete the final question on the regex tutorial but it continues to yield an error.

I was using:

const hexRegEx = /^#?(([0-9a-fA-F]{2}){3}|([0-9a-fA-F]){3})$/.test(text);

What am I doing wrong?

Sincerely, Daniel

app.js 
// Type inside this function
function isValidHex(text) {
  const hexRegEx = /^#?(([0-9a-fA-F]{2}){3}|([0-9a-fA-F]){3})$/.test(text);
}

const hex = document.getElementById("hex");
const body = document.getElementsByTagName("body")[0];

hex.addEventListener("input", e => {
  const text = e.target.value;
  const valid = isValidHex(text);
  if (valid) {
    body.style.backgroundColor = "rgb(176, 208, 168)";
  } else {
    body.style.backgroundColor = "rgb(189, 86, 86)";
  }
});
index.html 
<!DOCTYPE html>
<html>

<head>
    <title>DOM Manipulation</title>
</head>
<link rel="stylesheet" href="style.css" />

<body>
    <div id="content">
        <p>Enter a valid hex value below to make the screen turn green.</p>
        <input type="text" id="hex">
    </div>
    <script src="app.js"></script>
</body>

</html>

2 Answers

danielchristie
danielchristie
21,505 Points
danielchristie
danielchristie
21,505 Points

OK, got it now....Treehouse really should change the "ask for help" process to allow us to check existing forum posts before being required to ask our question. I can often solve my own questions by reading others' posts.

function isValidHex(text) {
  const hexRegEx = /^#[a-f 0-9]{6}$/i;
  return hexRegEx.test(text);
}
Rich Donnellan
MOD
Rich Donnellan
Treehouse Moderator 27,708 Points
Rich Donnellan
Rich Donnellan
Treehouse Moderator 27,708 Points

Hey, Daniel!

Awesome job solving your own issue! As for allowing students to check the existing questions, this is something we have already suggested to Treehouse staff. It's on a long list of features to implement to the Community. We feel your pain! :)

I reformatted your question and answer with the appropriate Markdown syntax for the code snippets.

Cheers!