Events is the main part of of the JavaScript application, events are signals that can generated when specific actions occur. When the user clicks a button an event is generated.

An event is also a action performed on a webpage by the user such as clicking a button or entering text into a textbox for generating an event.

There are different type of Event supported by javascript as given below :-

Event Description

Onmouse click when a mouse click event generated

On mouseover when the user moves the pointer over a web page

Onmouseout when mouse pointer moves out of an element

Onchange when a user change the value of a field

Onselect when the element is selected

Onreset runs when the script form is reset

abort its Occurs when the user cancels loading of an image

onkeypress runs when mouse button is pressed

onsubmit Script runs when the form is submitted

on dblclick its runs when a mouse double-click

error its occurs during loading of a document or image

onblur Script runs when the element loses focus

onfocus its runs when the element gets focus

load its Occurs when a page is loaded into Navigator

unload its Occurs when the user leaves a page

Examlpe of Onmouse click event :

Onmouse click event is occurs when mouse click on any button.

<html>
<head>
<script>
function sayHello()
 {
 alert("Hello javascript")
}
</script>
<input type="button" value="click" onclick="sayHello()"/>
</body>
</html>

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Output :

User click on button then message will shown

Mouseover event

Mouseover event will be occurred when the cursor over the control for first time.

Example :

<head>
 <script>
 function OnMouseIn (elem) {
 elem.style.border = "4px solid black";
 }
 function OnMouseOut (elem) {
 elem.style.border = "";
 }
 </script>
</head>
<body>
 <div style="background-color:pink; width:350px" 
 onmouseover="OnMouseIn (this)" onmouseout="OnMouseOut (this)">
 <p>Move your mouse in rectangle pointer and see effect </p
 </div>
</body>

Output :

before Mouseover

After Mouseover

Onmouseout

its show the effect when mouse over the statement and when mouse out of statement.

Example :

<html>
<head>
<script>
function rollover(target){
 target.style.background = "red";
}
function rollout(target){
 target.style.background = "magenta";
}
</script>
<div onmouseover=
"rollover(this)"
 onmouseout="rollout(this)"
> Mouse out of the statement then colour will be changed;
 </br> and mouse 
 in of statement then again colour will be changed </div>
</script>
<head>
<html>

Output :

when mouse out of rectangle when mouse on the rectangle

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