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# Day 23 - Event Listener
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## [Exercise:Solutions](#exercise-solutions)
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- ### [Exercise:Level 1](#exercises-level-1)
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#### [Home](../README.md) | [<< Day 22](./22_day_DOM2.md) | [Day 24 >>](../days/day_24/day_24.md)
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## Exercise Solutions
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### Exercise Level 1
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1. Generating numbers and marking evens, odds and prime numbers with three different colors. See the image below.
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```html
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// index.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Sayıları Göster</title>
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<style>
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*{
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margin: 0;
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padding: 0;
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text-align: center;
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}
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#result {
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border:1px solid;
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display: grid;
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grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
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margin-top: 20px;
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}
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li{
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border:1px solid;
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list-style: none;
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text-align: center;
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display: inline-block;
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}
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h5{
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margin-bottom: 20px;
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}
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</style>
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</head>
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<body>
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<div class="container"><h1>Number Generator</h1>
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<h3>30DaysOfJavaScript:DOM Day 3</h3>
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<h5>Nevzat Atalay</h5>
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<input type="number" id="inputNumber" placeholder="Bir sayı girin">
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<button onclick="displayNumbers()">Göster</button>
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<div id="result"></div></div>
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<script>
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function isPrime(num) {
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if (num < 2) {
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return false;
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}
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for (let i = 2; i <= Math.sqrt(num); i++) {
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if (num % i === 0) {
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return false;
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}
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}
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return true;
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}
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function displayNumbers() {
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const inputNumber = document.getElementById('inputNumber').value;
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const resultDiv = document.getElementById('result');
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resultDiv.innerHTML = ''; // Temizleme
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try {
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const num = parseInt(inputNumber);
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if (isNaN(num) || num < 0) {
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alert("Geçerli bir pozitif sayı giriniz.");
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return;
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}
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for (let i = 1; i <= num; i++) {
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let color = i % 2 === 1 ? 'yellow' : 'green';
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if (isPrime(i)) {
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color = 'red';
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}
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resultDiv.innerHTML += `<li style="background-Color:${color}">${i}</li>`;
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}
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} catch (error) {
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alert("Bir hata oluştu. Lütfen geçerli bir sayı giriniz.");
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}
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}
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</script>
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</body>
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</html>
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```
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2. Generating the keyboard code code using even listener. The image below.
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```js
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//app.js
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const div =document.getElementById("div")
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window.addEventListener("keydown", (e)=>{
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const li = document.createElement("li")
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div.innerHTML=""
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li.innerHTML= `Your pressed ${e.code}`
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div.appendChild(li)
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})
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```
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#### [Home](../README.md) | [<< Day 22](./22_day_DOM2.md) | [Day 24 >>](../days/day_24/day_24.md)
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