21
Events
onkeypress - A keyboard key is pressed or held down
onkeyup - A keyboard key is released
onload - A page or an image is finished loading
onmousedown - A mouse button is pressed
onmousemove - The mouse is moved
onmouseout - The mouse is moved off an element
onmouseover - The mouse is moved over an element
onmouseup - A mouse button is released
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22
Events
onreset - The reset button is clicked
onresize -   A window or frame is resized
onselect - Text is selected
onsubmit - The submit button is clicked
onunload -  The user exits the page
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onload & onUnload Events
The onload and onUnload events are triggered when 
the user enters or leaves the page
The onload event is often used to check the visitor's 
browser type and browser version, and load the 
proper version of the web page based on the 
information
Both the onload and onUnload events are also often 
used to deal with cookies that should be set when a 
user enters or leaves a page. 
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onFocus, onBlur and onChange
The onFocus, onBlur and onChange events are 
often used in combination with validation of form 
fields.
Example: The checkEmail() function will be called 
whenever the user changes the content of the field:
<input type="text" size="30"
id="email" onchange="checkEmail()">;
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Example & Demo: onblur
<html>
<head>
<script type="text/javascript">
function upperCase() {
var x=document.getElementById("fname").value
document.getElementById("fname").value=x.toUpperCase()
}
</script>
</head>
<body>
Enter your name:
<input type="text" id="fname" onblur="upperCase()">
</body>
</html>
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26
onSubmit
The onSubmit event is used to validate all form 
fields before submitting it.
Example: The checkForm() function will be called 
when the user clicks the submit button in the form. If 
the field values are not accepted, the submit should 
be canceled. The function checkForm() returns 
either true  or false . If it returns true the form will be 
submitted, otherwise the submit will be cancelled:
<form method="post" action="xxx.html"
onsubmit="return checkForm()">
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27
Example & Demo: onSubmit
<html>
<head>
<script type="text/javascript">
function validate() {
//  return true or false based on validation logic
}
</script>
</head>
<body>
<form action="tryjs_submitpage.htm" onsubmit="return validate()">
Name (max 10 chararcters): <input type="text" id="fname" size="20"><br />
Age (from 1 to 100): <input type="text" id="age" size="20"><br />
E-mail: <input type="text" id="email" size="20"><br />
<br />
<input type="submit" value="Submit"> 
</form>
</body>
</html>
28
onMouseOver and onMouseOut
onMouseOver and onMouseOut are often used to 
create "animated" buttons.
Below is an example of an onMouseOver event. An 
alert box appears when an onMouseOver event is 
detected:
<a href="http://www.w3schools.com"
onmouseover="alert('An onMouseOver event');return false">
<img src="w3schools.gif" width="100" height="30">
</a>
JavaScript Objects
JavaScript Objects
30
JavaScript Object 
JavaScript is an Object Oriented Programming (OOP) 
language
A JavaScript object has properties and methods
>
Example: String JavaScript object has length  property and 
toUpperCase() method
<script type="text/javascript">
var txt="Hello World!"
document.write(txt.length )
document.write(txt.toUpperCase())
</script>
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