Question

In: Computer Science

Palindrome Javascript - NUMBERS I am trying to write this javascript function to check if a...

Palindrome Javascript - NUMBERS

I am trying to write this javascript function to check if a number is Palindrome..

Palindrome means - a word, phrase, or sequence that reads the same backward as forward, e.g., 12321

This is the code i have, but it doesnt work.

PLEASE MAKE SURE IT WORK BEFORE POST ANSWER, I GOT @ CODE THAT DID WORK BEFORE

HTML

JavaScript Palindrome Exercise

rel="stylesheet"

type="text/css"

href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/css/bootstrap.min.css"

/>

Palindrome

Enter a positive number:

Is this a palindrome?

No

.JS

// Enter your code here

let convertButton = document.getElementsByClassName("btn")[0];

let userInput = document.getElementById("number").value;

let results = document.getElementById("result").value;

convertButton.addEventListener("click", function (event) {

event.preventDefault();

console.log(userInput);

if (validatePalidrome(userInput))

document.getElementById("result").innerHTML = "true";

else document.getElementById("result").innerHTML = "false";

});

function validatePalidrome(numbers) {

let userStringArray = userInput.split("");

let reverseUserInput = userStringArray.reverse();

let joinReverseString = reverseUserInput.join("");

if (userInput.localeCompare(joinReverseString) === 0) {

return true;

}

return false;

}

Solutions

Expert Solution

Note: Done accordingly. Please comment for any problem. Please Uprate. Thanks

Problems identified:

// Enter your code here

let convertButton = document.getElementsByClassName("btn")[0];

let userInput = document.getElementById("number").value; DONT KEEP THAT BEFORE FUNCTION CALL

let results = document.getElementById("result").value; AS IT WILL NO TAKE VALUES, IT IS LOADED WITH PAGE

convertButton.addEventListener("click", function (event) {

event.preventDefault();

console.log(userInput);

if (validatePalidrome(userInput))

document.getElementById("result").innerHTML = "true";

else document.getElementById("result").innerHTML = "false";

});

function validatePalidrome(numbers) {

let userStringArray = userInput.split(""); YOU SHOULD HAVE USED numbers not userInput as your parameter is numbers

let reverseUserInput = userStringArray.reverse();

let joinReverseString = reverseUserInput.join("");

if (userInput.localeCompare(joinReverseString) === 0) { YOU SHOULD HAVE USED numbers not userInput as your parameter is numbers

return true;

}

return false;

}

Solution:

Html file:

<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Palindrome</h2>
<div class="form-group">
<label for="number">Enter a positive number:</label>
<input type="text" class="form-control" id="number">
</div>
<button type="button" class="btn">Check</button>
<div class="form-group">
Is this a palindrome?
<p id="result"></p>
</div>
</div>
</body>
<script src="palin.js">
</script>

</html>

Javascript file (palin.js):

let convertButton = document.getElementsByClassName("btn")[0];
convertButton.addEventListener("click", function (event) {

event.preventDefault();

let userInput = document.getElementById("number").value;
let results = document.getElementById("result").value;

console.log(userInput);

if (validatePalidrome(userInput))

document.getElementById("result").innerHTML = "true";

else document.getElementById("result").innerHTML = "false";

});

function validatePalidrome(numbers) {

let userStringArray = numbers.split("");

let reverseUserInput = userStringArray.reverse();

let joinReverseString = reverseUserInput.join("");

if (numbers.localeCompare(joinReverseString) === 0) {

return true;

}

return false;

}

Output:

venereology answered 7 months ago
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