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Fix Issue #2042: prevent invalid input alert on backspace in Armstrong Checker #2060

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Fix Issue #2042: prevent invalid input alert on backspace in Armstrong Checker #2060

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2 changes: 1 addition & 1 deletion Projects/ArmstrongChecker/armstrong.html
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
<body>
<h1>Armstrong Checker</h1>
<div class="info">
<input type="text" onkeyup="textfxn()" id="text" placeholder="Enter a positive Number">
<input type="text" id="text" placeholder="Enter a positive Number">
<!-- <input type="text" placeholder="reverse string"> -->
<button id="btn">Check</button>
<p id="demo"></p>
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77 changes: 37 additions & 40 deletions Projects/ArmstrongChecker/armstrong.js
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Original file line number Diff line number Diff line change
@@ -1,44 +1,41 @@
const textinput = document.querySelector(".text");
console.log(textinput);
const res = document.getElementById("demo");
const checkbtn = document.getElementById("btn");
function textfxn() {
res.innerHTML = "";
let text = document.getElementById("text").value;
let newtext = text.replace(/[^0-9]/g, '');
let alphatext = text.replace(/[0-9]/g, '');
console.log(newtext, alphatext);
const input = document.getElementById("text");

if (newtext && !alphatext) {
checkbtn.style.opacity = "1";
document.getElementById("btn").addEventListener("click", check);
checkbtn.classList.add("buttonjs");
}
else {
alert("invalid input!")
checkbtn.style.opacity = "0.25";
checkbtn.classList.remove("buttonjs");
window.location.reload();
return;
}
}
// Clear message while typing
input.addEventListener("input", () => {
res.textContent = "";
checkbtn.style.opacity = "1";
checkbtn.classList.add("buttonjs");
});

function check() {
let text = document.getElementById("text").value;
let newtext = text.replace(/[^0-9]/g, '');
const numberOfDigits = newtext.length;
let temp = newtext;
let sum = 0;
while (temp > 0) {
let remainder = temp % 10;
sum += remainder ** numberOfDigits;
temp = parseInt(temp / 10);
}
if (sum == newtext) {
res.innerHTML = (`${newtext} is an Armstrong number`);
}
else {
res.innerHTML = (`${newtext} is not an Armstrong number.`);
}
}
// });value;
// Validate and check Armstrong number on click
checkbtn.addEventListener("click", () => {
const text = input.value.trim();

// Empty or invalid input
if (!text || /[^0-9]/.test(text)) {
res.textContent = "⚠️ Please enter a valid positive number.";
res.style.color = "#f87171"; // red
return;
}

const num = Number(text);
const digits = text.length;
let temp = num;
let sum = 0;

while (temp > 0) {
const remainder = temp % 10;
sum += Math.pow(remainder, digits);
temp = Math.floor(temp / 10);
}

res.style.color = "#fff"; // reset color

if (sum === num) {
res.textContent = `${num} is an Armstrong number.`;
} else {
res.textContent = `${num} is not an Armstrong number.`;
}
});