Event Handler in Javascript

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This program is about event handler in javascript.

What is an event handler?
An event handler executes a segment of a code based on certain events occurring within the application, such as onLoad, onClick.Handlers are small pieces of code (function) that know what to do when an event occurs.


Screenshot:



<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>Guess the Image</title>
<style>
body {margin: 20px; }
img { margin: 20px; }
</style>
<script>
 window.onload= init;

 function init() {
 var image = document.getElementById("nature");
 image.onclick = showAnswer;
 };

 function showAnswer() {
 var image = document.getElementById("nature");
 image.src = "boats.jpg"
 }

 function timehandler() {
  alert("Hey!! What are you waiting for? Click on the image")
 }
 setTimeout(timehandler, 5000);
</script>
 </head>
 <body>
<img id="boats" src="boatsblur.jpg">
 </body>
 </html>
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