palindromes/palindrome.html at master · TJCodes/palindromes · GitHub

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<!DOCTYPE html>

<html lang="en">
    <head>
        <title>Palindrome</title>

        <style>
            body, html {
                text-align: center;
                margin: 0 auto
                background: #0F2027;
                background: -webkit-linear-gradient(to right, #2C5364, #203A43, #0F2027);
                background: linear-gradient(to right, #2C5364, #203A43, #0F2027);
                color: white;

            }

            p, label {
                font-family: sans-serif;
            }

            h1 {
                font-variant: small-caps;
            }

            .container {
                height: 100vh;
                width: 100vw;
                position: relative;
                margin: 0 auto;
            }

            .content {
                margin: 0;
                position: absolute;
                top: 30%;
                left: 50%;
                -ms-transform: translateY(-50%);
                transform: translateY(-50%);
                -ms-transform: translateX(-50%);
                transform: translateX(-50%);
            }

            #hide:hover {
                cursor: pointer;
                color: deepskyblue;
            }
        </style>

    </head>

    <body>
        <div class="container">
            <div class="content">
                <h1>palindrome checker!</h1>
                <label style="top: 50%">
                    Enter a word to check if it is a Palindrome!
                </label>
                <br>
                <input type="text" id="text">
                <input type="submit" value="check" onclick="checkPalindrome()">
                <br><br>
                <label>
                    Display the last 10 Palindromes in the last 10 minutes
                </label>
                <br>
                <input type="button" value="display" onclick="displayPalindromes()">
                <p id="resultText"></p>
                <p id="displayPalindromes" hidden></p>
                <p style="color: lightblue; text-decoration: underline;" id="hide" hidden>
                    hide
                </p>
            </div>
        </div>

        <script>
            const prevPalindromes = [];
            const list = document.getElementById('displayPalindromes');
            const hide = document.getElementById('hide');
            let x = 0;

            function checkPalindrome(){
                const resultText = document.getElementById('resultText');
                const remove = /[\W_]/g
                let inputString = document.getElementById('text').value;
                let editedString = inputString.toLowerCase().replace(remove, "")
                let reversedString = editedString.split("").reverse().join("");

                if (editedString === reversedString){
                    resultText.innerHTML = inputString + " is a palindrome!";

                    //if there are already 10 palindrome in the array, remove the oldest element before adding the new palindrome
                    if (x > 9)
                        prevPalindromes.shift();

                    prevPalindromes[x] = inputString;

                    //set a 10 minute timer for each palindrome added to the array
                    function timer(){
                        setTimeout(function(){
                            prevPalindromes.shift();
                            x--;
                        }, 600000);
                    }
                    timer();

                    //Update the list if it is already being displayed
                    if (list.hidden == false){
                        displayPalindromes();
                    }
                    x++;

                }
                else
                    resultText.innerHTML= inputString + " is not a palindrome";
            }

            function displayPalindromes(){
                let i = 0;
                let z = "";

                list.removeAttribute('hidden');
                hide.removeAttribute('hidden');

                for (i = 0; i < prevPalindromes.length ; i++){
                    z = z + prevPalindromes[i] + "<br>";
                    list.innerHTML = z;
                }
            }

            hide.addEventListener('click', function(){
                list.hidden = true;
                hide.hidden = true;
            });
        </script>
    </body>
</html>